ha_innodb.cc 159 KB
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/* Copyright (C) 2000 MySQL AB & Innobase Oy
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   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 2 of the License, or
   (at your option) any later version.
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   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.
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   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA */

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/* This file defines the InnoDB handler: the interface between MySQL and
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InnoDB
NOTE: You can only use noninlined InnoDB functions in this file, because we
have disables the InnoDB inlining in this file. */
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/* TODO list for the InnoDB handler in 4.1:
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  - Remove the flag innodb_active_trans from thd and replace it with a
    function call innodb_active_trans(thd), which looks at the InnoDB
    trx struct state field
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  - Find out what kind of problems the OS X case-insensitivity causes to
    table and database names; should we 'normalize' the names like we do
    in Windows?
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*/
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#ifdef __GNUC__
#pragma implementation				// gcc: Class implementation
#endif

#include "mysql_priv.h"
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#include "slave.h"
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#ifdef HAVE_INNOBASE_DB
#include <m_ctype.h>
#include <hash.h>
#include <myisampack.h>
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#include <mysys_err.h>
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#include <my_sys.h>
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#define MAX_ULONG_BIT ((ulong) 1 << (sizeof(ulong)*8-1))

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#include "ha_innodb.h"
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pthread_mutex_t innobase_mutex;
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bool innodb_inited= 0;
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/* Store MySQL definition of 'byte': in Linux it is char while InnoDB
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uses unsigned char; the header univ.i which we include next defines
'byte' as a macro which expands to 'unsigned char' */

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typedef byte	mysql_byte;
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#define INSIDE_HA_INNOBASE_CC

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/* Include necessary InnoDB headers */
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extern "C" {
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#include "../innobase/include/univ.i"
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#include "../innobase/include/os0file.h"
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#include "../innobase/include/os0thread.h"
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#include "../innobase/include/srv0start.h"
#include "../innobase/include/srv0srv.h"
#include "../innobase/include/trx0roll.h"
#include "../innobase/include/trx0trx.h"
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#include "../innobase/include/trx0sys.h"
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#include "../innobase/include/mtr0mtr.h"
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#include "../innobase/include/row0ins.h"
#include "../innobase/include/row0mysql.h"
#include "../innobase/include/row0sel.h"
#include "../innobase/include/row0upd.h"
#include "../innobase/include/log0log.h"
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#include "../innobase/include/lock0lock.h"
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#include "../innobase/include/dict0crea.h"
#include "../innobase/include/btr0cur.h"
#include "../innobase/include/btr0btr.h"
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#include "../innobase/include/fsp0fsp.h"
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#include "../innobase/include/sync0sync.h"
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#include "../innobase/include/fil0fil.h"
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}

#define HA_INNOBASE_ROWS_IN_TABLE 10000 /* to get optimization right */
#define HA_INNOBASE_RANGE_COUNT	  100

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uint 	innobase_init_flags 	= 0;
ulong 	innobase_cache_size 	= 0;
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/* The default values for the following, type long, start-up parameters
are declared in mysqld.cc: */

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long innobase_mirrored_log_groups, innobase_log_files_in_group,
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     innobase_log_file_size, innobase_log_buffer_size,
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     innobase_buffer_pool_awe_mem_mb,
     innobase_buffer_pool_size, innobase_additional_mem_pool_size,
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     innobase_file_io_threads, innobase_lock_wait_timeout,
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     innobase_thread_concurrency, innobase_force_recovery,
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     innobase_open_files;
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/* The default values for the following char* start-up parameters
are determined in innobase_init below: */
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char*	innobase_data_home_dir			= NULL;
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char*	innobase_data_file_path 		= NULL;
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char*	innobase_log_group_home_dir		= NULL;
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char*	innobase_log_arch_dir			= NULL;/* unused */
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/* The following has a misleading name: starting from 4.0.5, this also
affects Windows: */
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char*	innobase_unix_file_flush_method		= NULL;

/* Below we have boolean-valued start-up parameters, and their default
values */

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uint	innobase_flush_log_at_trx_commit	= 1;
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my_bool innobase_log_archive			= FALSE;/* unused */
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my_bool	innobase_use_native_aio			= FALSE;
my_bool	innobase_fast_shutdown			= TRUE;
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my_bool innobase_very_fast_shutdown		= FALSE; /* this can be set to
							 1 just prior calling
							 innobase_end() */
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my_bool	innobase_file_per_table			= FALSE;
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my_bool innobase_locks_unsafe_for_binlog        = FALSE;
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my_bool innobase_create_status_file		= FALSE;
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static char *internal_innobase_data_file_path	= NULL;
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/* The following counter is used to convey information to InnoDB
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about server activity: in selects it is not sensible to call
srv_active_wake_master_thread after each fetch or search, we only do
it every INNOBASE_WAKE_INTERVAL'th step. */

#define INNOBASE_WAKE_INTERVAL	32
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ulong	innobase_active_counter	= 0;
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char*	innobase_home 	= NULL;

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char    innodb_dummy_stmt_trx_handle = 'D';

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static HASH 	innobase_open_tables;
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#ifdef __NETWARE__  	/* some special cleanup for NetWare */
bool nw_panic = FALSE;
#endif

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static mysql_byte* innobase_get_key(INNOBASE_SHARE *share,uint *length,
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			      my_bool not_used __attribute__((unused)));
static INNOBASE_SHARE *get_share(const char *table_name);
static void free_share(INNOBASE_SHARE *share);

/* General functions */

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/**********************************************************************
Save some CPU by testing the value of srv_thread_concurrency in inline
functions. */
inline
void
innodb_srv_conc_enter_innodb(
/*=========================*/
	trx_t*	trx)	/* in: transaction handle */
{
	if (srv_thread_concurrency >= 500) {

		return;
	}

	srv_conc_enter_innodb(trx);
}

/**********************************************************************
Save some CPU by testing the value of srv_thread_concurrency in inline
functions. */
inline
void
innodb_srv_conc_exit_innodb(
/*========================*/
	trx_t*	trx)	/* in: transaction handle */
{
	if (srv_thread_concurrency >= 500) {

		return;
	}

	srv_conc_exit_innodb(trx);
}

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/**********************************************************************
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Releases possible search latch and InnoDB thread FIFO ticket. These should
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be released at each SQL statement end, and also when mysqld passes the
control to the client. It does no harm to release these also in the middle
of an SQL statement. */
inline
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void
innobase_release_stat_resources(
/*============================*/
	trx_t*	trx)	/* in: transaction object */
{
	if (trx->has_search_latch) {
		trx_search_latch_release_if_reserved(trx);
	}

	if (trx->declared_to_be_inside_innodb) {
		/* Release our possible ticket in the FIFO */

		srv_conc_force_exit_innodb(trx);
	}
}

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/************************************************************************
Call this function when mysqld passes control to the client. That is to
avoid deadlocks on the adaptive hash S-latch possibly held by thd. For more
documentation, see handler.cc. */

void
innobase_release_temporary_latches(
/*===============================*/
        void*   innobase_tid)
{
        innobase_release_stat_resources((trx_t*)innobase_tid);
}

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/************************************************************************
Increments innobase_active_counter and every INNOBASE_WAKE_INTERVALth
time calls srv_active_wake_master_thread. This function should be used
when a single database operation may introduce a small need for
server utility activity, like checkpointing. */
inline
void
innobase_active_small(void)
/*=======================*/
{
	innobase_active_counter++;

	if ((innobase_active_counter % INNOBASE_WAKE_INTERVAL) == 0) {
		srv_active_wake_master_thread();
	}
}

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/************************************************************************
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Converts an InnoDB error code to a MySQL error code and also tells to MySQL
about a possible transaction rollback inside InnoDB caused by a lock wait
timeout or a deadlock. */
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static
int
convert_error_code_to_mysql(
/*========================*/
			/* out: MySQL error code */
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	int	error,	/* in: InnoDB error code */
	THD*	thd)	/* in: user thread handle or NULL */
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{
	if (error == DB_SUCCESS) {

		return(0);

  	} else if (error == (int) DB_DUPLICATE_KEY) {

    		return(HA_ERR_FOUND_DUPP_KEY);

 	} else if (error == (int) DB_RECORD_NOT_FOUND) {

    		return(HA_ERR_NO_ACTIVE_RECORD);

 	} else if (error == (int) DB_ERROR) {

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    		return(-1); /* unspecified error */
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 	} else if (error == (int) DB_DEADLOCK) {
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 		/* Since we rolled back the whole transaction, we must
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 		tell it also to MySQL so that MySQL knows to empty the
 		cached binlog for this transaction */

 		if (thd) {
 			ha_rollback(thd);
 		}
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    		return(HA_ERR_LOCK_DEADLOCK);

 	} else if (error == (int) DB_LOCK_WAIT_TIMEOUT) {

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		/* Since we rolled back the whole transaction, we must
		tell it also to MySQL so that MySQL knows to empty the
		cached binlog for this transaction */
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		if (thd) {
			ha_rollback(thd);
		}
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   		return(HA_ERR_LOCK_WAIT_TIMEOUT);
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 	} else if (error == (int) DB_NO_REFERENCED_ROW) {

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    		return(HA_ERR_NO_REFERENCED_ROW);
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 	} else if (error == (int) DB_ROW_IS_REFERENCED) {

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    		return(HA_ERR_ROW_IS_REFERENCED);
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        } else if (error == (int) DB_CANNOT_ADD_CONSTRAINT) {
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    		return(HA_ERR_CANNOT_ADD_FOREIGN);
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        } else if (error == (int) DB_CANNOT_DROP_CONSTRAINT) {

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    		return(HA_ERR_ROW_IS_REFERENCED); /* TODO: This is a bit
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						misleading, a new MySQL error
						code should be introduced */
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        } else if (error == (int) DB_COL_APPEARS_TWICE_IN_INDEX) {

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    		return(HA_ERR_CRASHED);
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 	} else if (error == (int) DB_OUT_OF_FILE_SPACE) {

    		return(HA_ERR_RECORD_FILE_FULL);

 	} else if (error == (int) DB_TABLE_IS_BEING_USED) {

    		return(HA_ERR_WRONG_COMMAND);

 	} else if (error == (int) DB_TABLE_NOT_FOUND) {

    		return(HA_ERR_KEY_NOT_FOUND);

  	} else if (error == (int) DB_TOO_BIG_RECORD) {

    		return(HA_ERR_TO_BIG_ROW);
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  	} else if (error == (int) DB_CORRUPTION) {

    		return(HA_ERR_CRASHED);
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  	} else if (error == (int) DB_NO_SAVEPOINT) {

    		return(HA_ERR_NO_SAVEPOINT);
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  	} else if (error == (int) DB_LOCK_TABLE_FULL) {

    		return(HA_ERR_LOCK_TABLE_FULL);
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    	} else {
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    		return(-1);			// Unknown error
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    	}
}

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/*****************************************************************
If you want to print a thd that is not associated with the current thread,
you must call this function before reserving the InnoDB kernel_mutex, to
protect MySQL from setting thd->query NULL. If you print a thd of the current
thread, we know that MySQL cannot modify thd->query, and it is not necessary
to call this. Call innobase_mysql_end_print_arbitrary_thd() after you release
the kernel_mutex.
NOTE that /mysql/innobase/lock/lock0lock.c must contain the prototype for this
function! */
extern "C"
void
innobase_mysql_prepare_print_arbitrary_thd(void)
/*============================================*/
{
	VOID(pthread_mutex_lock(&LOCK_thread_count));
}

/*****************************************************************
Relases the mutex reserved by innobase_mysql_prepare_print_arbitrary_thd().
NOTE that /mysql/innobase/lock/lock0lock.c must contain the prototype for this
function! */
extern "C"
void
innobase_mysql_end_print_arbitrary_thd(void)
/*========================================*/
{
	VOID(pthread_mutex_unlock(&LOCK_thread_count));
}

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/*****************************************************************
Prints info of a THD object (== user session thread) to the
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standard output. NOTE that /mysql/innobase/trx/trx0trx.c must contain
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the prototype for this function! */
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extern "C"
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void
innobase_mysql_print_thd(
/*=====================*/
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	FILE*   f,	/* in: output stream */
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        void*   input_thd)/* in: pointer to a MySQL THD object */
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{
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	const THD*	thd;
	const char*	s;
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	char		buf[301];
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        thd = (const THD*) input_thd;
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  	fprintf(f, "MySQL thread id %lu, query id %lu",
		thd->thread_id, thd->query_id);
	if (thd->host) {
		putc(' ', f);
		fputs(thd->host, f);
	}
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	if (thd->ip) {
		putc(' ', f);
		fputs(thd->ip, f);
	}
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  	if (thd->user) {
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		putc(' ', f);
		fputs(thd->user, f);
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  	}

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	if ((s = thd->proc_info)) {
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		putc(' ', f);
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		fputs(s, f);
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	}
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	if ((s = thd->query)) {
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		/* determine the length of the query string */
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		uint32 i, len;
		
		len = thd->query_length;

		if (len > 300) {
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			len = 300;	/* ADDITIONAL SAFETY: print at most
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					300 chars to reduce the probability of
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					a seg fault if there is a race in
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					thd->query_length in MySQL; after
					May 14, 2004 probably no race any more,
					but better be safe */
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		}
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                /* Use strmake to reduce the timeframe
                   for a race, compared to fwrite() */
		i= (uint) (strmake(buf, s, len) - buf);
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		putc('\n', f);
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		fwrite(buf, 1, i, f);
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	}
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	putc('\n', f);
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}

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/**********************************************************************
Compares NUL-terminated UTF-8 strings case insensitively.

NOTE that the exact prototype of this function has to be in
/innobase/dict/dict0dict.c! */
extern "C"
int
innobase_strcasecmp(
/*================*/
				/* out: 0 if a=b, <0 if a<b, >1 if a>b */
	const char*	a,	/* in: first string to compare */
	const char*	b)	/* in: second string to compare */
{
	return(my_strcasecmp(system_charset_info, a, b));
}

/**********************************************************************
Makes all characters in a NUL-terminated UTF-8 string lower case.

NOTE that the exact prototype of this function has to be in
/innobase/dict/dict0dict.c! */
extern "C"
void
innobase_casedn_str(
/*================*/
	char*	a)	/* in/out: string to put in lower case */
{
	my_casedn_str(system_charset_info, a);
}

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/*************************************************************************
Creates a temporary file. */
extern "C"
int
innobase_mysql_tmpfile(void)
/*========================*/
			/* out: temporary file descriptor, or < 0 on error */
{
	char	filename[FN_REFLEN];
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	int	fd2 = -1;
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	File	fd = create_temp_file(filename, mysql_tmpdir, "ib",
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#ifdef __WIN__
				O_BINARY | O_TRUNC | O_SEQUENTIAL |
				O_TEMPORARY | O_SHORT_LIVED |
#endif /* __WIN__ */
				O_CREAT | O_EXCL | O_RDWR,
				MYF(MY_WME));
	if (fd >= 0) {
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#ifndef __WIN__
		/* On Windows, open files cannot be removed, but files can be
		created with the O_TEMPORARY flag to the same effect
		("delete on close"). */
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		unlink(filename);
#endif /* !__WIN__ */
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		/* Copy the file descriptor, so that the additional resources
		allocated by create_temp_file() can be freed by invoking
		my_close().

		Because the file descriptor returned by this function
		will be passed to fdopen(), it will be closed by invoking
		fclose(), which in turn will invoke close() instead of
		my_close(). */
		fd2 = dup(fd);
		if (fd2 < 0) {
			DBUG_PRINT("error",("Got error %d on dup",fd2));
			my_errno=errno;
			my_error(EE_OUT_OF_FILERESOURCES,
				MYF(ME_BELL+ME_WAITTANG), filename, my_errno);
		}
		my_close(fd, MYF(MY_WME));
	}
	return(fd2);
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}

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/*************************************************************************
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Gets the InnoDB transaction handle for a MySQL handler object, creates
an InnoDB transaction struct if the corresponding MySQL thread struct still
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lacks one. */
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static
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trx_t*
check_trx_exists(
/*=============*/
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			/* out: InnoDB transaction handle */
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	THD*	thd)	/* in: user thread handle */
{
	trx_t*	trx;

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	ut_ad(thd == current_thd);
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	trx = (trx_t*) thd->transaction.all.innobase_tid;
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	if (trx == NULL) {
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	        DBUG_ASSERT(thd != NULL);
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		trx = trx_allocate_for_mysql();
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		trx->mysql_thd = thd;
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		trx->mysql_query_str = &((*thd).query);
		
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		thd->transaction.all.innobase_tid = trx;
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		/* The execution of a single SQL statement is denoted by
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		a 'transaction' handle which is a dummy pointer: InnoDB
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		remembers internally where the latest SQL statement
		started, and if error handling requires rolling back the
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		latest statement, InnoDB does a rollback to a savepoint. */
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		thd->transaction.stmt.innobase_tid =
		                  (void*)&innodb_dummy_stmt_trx_handle;
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	} else {
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		if (trx->magic_n != TRX_MAGIC_N) {
			mem_analyze_corruption((byte*)trx);

			ut_a(0);
		}
	}

	if (thd->options & OPTION_NO_FOREIGN_KEY_CHECKS) {
		trx->check_foreigns = FALSE;
	} else {
		trx->check_foreigns = TRUE;
	}

	if (thd->options & OPTION_RELAXED_UNIQUE_CHECKS) {
		trx->check_unique_secondary = FALSE;
	} else {
		trx->check_unique_secondary = TRUE;
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	}

	return(trx);
}

/*************************************************************************
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Updates the user_thd field in a handle and also allocates a new InnoDB
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transaction handle if needed, and updates the transaction fields in the
prebuilt struct. */
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inline
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int
ha_innobase::update_thd(
/*====================*/
			/* out: 0 or error code */
	THD*	thd)	/* in: thd to use the handle */
{
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	row_prebuilt_t*	prebuilt = (row_prebuilt_t*) innobase_prebuilt;
	trx_t*		trx;
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	trx = check_trx_exists(thd);

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	if (prebuilt->trx != trx) {
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		row_update_prebuilt_trx(prebuilt, trx);
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	}

	user_thd = thd;
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	return(0);
}

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/*   BACKGROUND INFO: HOW THE MYSQL QUERY CACHE WORKS WITH INNODB
     ------------------------------------------------------------

1) The use of the query cache for TBL is disabled when there is an
uncommitted change to TBL.

2) When a change to TBL commits, InnoDB stores the current value of
its global trx id counter, let us denote it by INV_TRX_ID, to the table object
in the InnoDB data dictionary, and does only allow such transactions whose
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id <= INV_TRX_ID to use the query cache.
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3) When InnoDB does an INSERT/DELETE/UPDATE to a table TBL, or an implicit
modification because an ON DELETE CASCADE, we invalidate the MySQL query cache
of TBL immediately.

How this is implemented inside InnoDB:

1) Since every modification always sets an IX type table lock on the InnoDB
table, it is easy to check if there can be uncommitted modifications for a
table: just check if there are locks in the lock list of the table.

2) When a transaction inside InnoDB commits, it reads the global trx id
counter and stores the value INV_TRX_ID to the tables on which it had a lock.

3) If there is an implicit table change from ON DELETE CASCADE or SET NULL,
InnoDB calls an invalidate method for the MySQL query cache for that table.

How this is implemented inside sql_cache.cc:

1) The query cache for an InnoDB table TBL is invalidated immediately at an
INSERT/UPDATE/DELETE, just like in the case of MyISAM. No need to delay
invalidation to the transaction commit.

2) To store or retrieve a value from the query cache of an InnoDB table TBL,
any query must first ask InnoDB's permission. We must pass the thd as a
parameter because InnoDB will look at the trx id, if any, associated with
that thd.

3) Use of the query cache for InnoDB tables is now allowed also when
AUTOCOMMIT==0 or we are inside BEGIN ... COMMIT. Thus transactions no longer
put restrictions on the use of the query cache.
*/

/**********************************************************************
The MySQL query cache uses this to check from InnoDB if the query cache at
the moment is allowed to operate on an InnoDB table. The SQL query must
be a non-locking SELECT.

The query cache is allowed to operate on certain query only if this function
returns TRUE for all tables in the query.

If thd is not in the autocommit state, this function also starts a new
transaction for thd if there is no active trx yet, and assigns a consistent
read view to it if there is no read view yet. */

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my_bool
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innobase_query_caching_of_table_permitted(
/*======================================*/
				/* out: TRUE if permitted, FALSE if not;
				note that the value FALSE does not mean
				we should invalidate the query cache:
				invalidation is called explicitly */
	THD*	thd,		/* in: thd of the user who is trying to
				store a result to the query cache or
				retrieve it */
	char*	full_name,	/* in: concatenation of database name,
				the null character '\0', and the table
				name */
	uint	full_name_len)	/* in: length of the full name, i.e.
				len(dbname) + len(tablename) + 1 */
{
	ibool	is_autocommit;
	trx_t*	trx;
	char	norm_name[1000];

	ut_a(full_name_len < 999);

	if (thd->variables.tx_isolation == ISO_SERIALIZABLE) {
		/* In the SERIALIZABLE mode we add LOCK IN SHARE MODE to every
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		plain SELECT if AUTOCOMMIT is not on. */
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		return((my_bool)FALSE);
	}

	trx = (trx_t*) thd->transaction.all.innobase_tid;

	if (trx == NULL) {
		trx = check_trx_exists(thd);
	}

	innobase_release_stat_resources(trx);

	if (!(thd->options & (OPTION_NOT_AUTOCOMMIT | OPTION_BEGIN))) {

		is_autocommit = TRUE;
	} else {
		is_autocommit = FALSE;

	}

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	if (is_autocommit && trx->n_mysql_tables_in_use == 0) {
		/* We are going to retrieve the query result from the query
		cache. This cannot be a store operation to the query cache
		because then MySQL would have locks on tables already.

		TODO: if the user has used LOCK TABLES to lock the table,
		then we open a transaction in the call of row_.. below.
		That trx can stay open until UNLOCK TABLES. The same problem
		exists even if we do not use the query cache. MySQL should be
		modified so that it ALWAYS calls some cleanup function when
		the processing of a query ends!

		We can imagine we instantaneously serialize this consistent
		read trx to the current trx id counter. If trx2 would have
		changed the tables of a query result stored in the cache, and
		trx2 would have already committed, making the result obsolete,
		then trx2 would have already invalidated the cache. Thus we
		can trust the result in the cache is ok for this query. */
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		return((my_bool)TRUE);
	}
	
	/* Normalize the table name to InnoDB format */

	memcpy(norm_name, full_name, full_name_len);

	norm_name[strlen(norm_name)] = '/'; /* InnoDB uses '/' as the
					    separator between db and table */
	norm_name[full_name_len] = '\0';
#ifdef __WIN__
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	innobase_casedn_str(norm_name);
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#endif
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	/* The call of row_search_.. will start a new transaction if it is
	not yet started */

	thd->transaction.all.innodb_active_trans = 1;

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	if (row_search_check_if_query_cache_permitted(trx, norm_name)) {

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		/* printf("Query cache for %s permitted\n", norm_name); */
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		return((my_bool)TRUE);
	}

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	/* printf("Query cache for %s NOT permitted\n", norm_name); */
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	return((my_bool)FALSE);
}

/*********************************************************************
Invalidates the MySQL query cache for the table.
NOTE that the exact prototype of this function has to be in
/innobase/row/row0ins.c! */
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extern "C"
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void
innobase_invalidate_query_cache(
/*============================*/
	trx_t*	trx,		/* in: transaction which modifies the table */
	char*	full_name,	/* in: concatenation of database name, null
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				char '\0', table name, null char'\0';
				NOTE that in Windows this is always
				in LOWER CASE! */
	ulint	full_name_len)	/* in: full name length where also the null
				chars count */
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{
	/* Argument TRUE below means we are using transactions */
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#ifdef HAVE_QUERY_CACHE
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	query_cache.invalidate((THD*)(trx->mysql_thd),
					(const char*)full_name,
					(uint32)full_name_len,
					TRUE);
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#endif
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}
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/*********************************************************************
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Get the quote character to be used in SQL identifiers.
This definition must match the one in innobase/ut/ut0ut.c! */
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extern "C"
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int
mysql_get_identifier_quote_char(
/*============================*/
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				/* out: quote character to be
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				used in SQL identifiers; EOF if none */
	trx_t*		trx,	/* in: transaction */
	const char*	name,	/* in: name to print */
	ulint		namelen)/* in: length of name */
{
	if (!trx || !trx->mysql_thd) {
		return(EOF);
	}
	return(get_quote_char_for_identifier((THD*) trx->mysql_thd,
						name, namelen));
}

/**************************************************************************
Obtain a pointer to the MySQL THD object, as in current_thd().  This
definition must match the one in sql/ha_innodb.cc! */
extern "C"
void*
innobase_current_thd(void)
/*======================*/
			/* out: MySQL THD object */
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{
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	return(current_thd);
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}

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/*********************************************************************
Call this when you have opened a new table handle in HANDLER, before you
call index_read_idx() etc. Actually, we can let the cursor stay open even
over a transaction commit! Then you should call this before every operation,
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fetch next etc. This function inits the necessary things even after a
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transaction commit. */

void
ha_innobase::init_table_handle_for_HANDLER(void)
/*============================================*/
{
        row_prebuilt_t* prebuilt;

        /* If current thd does not yet have a trx struct, create one.
        If the current handle does not yet have a prebuilt struct, create
        one. Update the trx pointers in the prebuilt struct. Normally
        this operation is done in external_lock. */

        update_thd(current_thd);

        /* Initialize the prebuilt struct much like it would be inited in
        external_lock */

        prebuilt = (row_prebuilt_t*)innobase_prebuilt;

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	innobase_release_stat_resources(prebuilt->trx);

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        /* If the transaction is not started yet, start it */

        trx_start_if_not_started_noninline(prebuilt->trx);

        /* Assign a read view if the transaction does not have it yet */

        trx_assign_read_view(prebuilt->trx);

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	/* Set the MySQL flag to mark that there is an active transaction */

	current_thd->transaction.all.innodb_active_trans = 1;

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        /* We did the necessary inits in this function, no need to repeat them
        in row_search_for_mysql */

        prebuilt->sql_stat_start = FALSE;

        /* We let HANDLER always to do the reads as consistent reads, even
        if the trx isolation level would have been specified as SERIALIZABLE */

        prebuilt->select_lock_type = LOCK_NONE;
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        prebuilt->stored_select_lock_type = LOCK_NONE;
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        /* Always fetch all columns in the index record */

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        prebuilt->hint_need_to_fetch_extra_cols = ROW_RETRIEVE_ALL_COLS;
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        /* We want always to fetch all columns in the whole row? Or do
	we???? */

        prebuilt->read_just_key = FALSE;
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	prebuilt->used_in_HANDLER = TRUE;
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}

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/*************************************************************************
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Opens an InnoDB database. */
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bool
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innobase_init(void)
/*===============*/
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			/* out: TRUE if error */
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{
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	static char	current_dir[3];		/* Set if using current lib */
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	int		err;
	bool		ret;
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	char 	        *default_path;
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  	DBUG_ENTER("innobase_init");

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  	os_innodb_umask = (ulint)my_umask;
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	/* First calculate the default path for innodb_data_home_dir etc.,
	in case the user has not given any value.

	Note that when using the embedded server, the datadirectory is not
	necessarily the current directory of this program. */

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	if (mysqld_embedded) {
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		default_path = mysql_real_data_home;
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		fil_path_to_mysql_datadir = mysql_real_data_home;
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	} else {
	  	/* It's better to use current lib, to keep paths short */
	  	current_dir[0] = FN_CURLIB;
	  	current_dir[1] = FN_LIBCHAR;
	  	current_dir[2] = 0;
	  	default_path = current_dir;
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	}

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	ut_a(default_path);

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	if (specialflag & SPECIAL_NO_PRIOR) {
	        srv_set_thread_priorities = FALSE;
	} else {
	        srv_set_thread_priorities = TRUE;
	        srv_query_thread_priority = QUERY_PRIOR;
	}
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	/* Set InnoDB initialization parameters according to the values
	read from MySQL .cnf file */
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	/*--------------- Data files -------------------------*/
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	/* The default dir for data files is the datadir of MySQL */
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	srv_data_home = (innobase_data_home_dir ? innobase_data_home_dir :
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			 default_path);
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	/* Set default InnoDB data file size to 10 MB and let it be
  	auto-extending. Thus users can use InnoDB in >= 4.0 without having
	to specify any startup options. */

	if (!innobase_data_file_path) {
  		innobase_data_file_path = (char*) "ibdata1:10M:autoextend";
	}

	/* Since InnoDB edits the argument in the next call, we make another
	copy of it: */

	internal_innobase_data_file_path = my_strdup(innobase_data_file_path,
						   MYF(MY_WME));

	ret = (bool) srv_parse_data_file_paths_and_sizes(
				internal_innobase_data_file_path,
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				&srv_data_file_names,
				&srv_data_file_sizes,
				&srv_data_file_is_raw_partition,
				&srv_n_data_files,
				&srv_auto_extend_last_data_file,
				&srv_last_file_size_max);
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	if (ret == FALSE) {
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	  	sql_print_error(
			"InnoDB: syntax error in innodb_data_file_path");
	  	DBUG_RETURN(TRUE);
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	}
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	/* -------------- Log files ---------------------------*/

	/* The default dir for log files is the datadir of MySQL */
	
	if (!innobase_log_group_home_dir) {
	  	innobase_log_group_home_dir = default_path;
	}
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#ifdef UNIV_LOG_ARCHIVE	  	
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	/* Since innodb_log_arch_dir has no relevance under MySQL,
	starting from 4.0.6 we always set it the same as
	innodb_log_group_home_dir: */

	innobase_log_arch_dir = innobase_log_group_home_dir;

	srv_arch_dir = innobase_log_arch_dir;
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#endif /* UNIG_LOG_ARCHIVE */
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	ret = (bool)
		srv_parse_log_group_home_dirs(innobase_log_group_home_dir,
						&srv_log_group_home_dirs);
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	if (ret == FALSE || innobase_mirrored_log_groups != 1) {
		fprintf(stderr,
		"InnoDB: syntax error in innodb_log_group_home_dir\n"
		"InnoDB: or a wrong number of mirrored log groups\n");
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		DBUG_RETURN(TRUE);
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	}
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	/* --------------------------------------------------*/

	srv_file_flush_method_str = innobase_unix_file_flush_method;
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	srv_n_log_groups = (ulint) innobase_mirrored_log_groups;
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	srv_n_log_files = (ulint) innobase_log_files_in_group;
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	srv_log_file_size = (ulint) innobase_log_file_size;

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#ifdef UNIV_LOG_ARCHIVE
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	srv_log_archive_on = (ulint) innobase_log_archive;
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#endif /* UNIV_LOG_ARCHIVE */
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	srv_log_buffer_size = (ulint) innobase_log_buffer_size;
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	srv_flush_log_at_trx_commit = (ulint) innobase_flush_log_at_trx_commit;
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        /* We set srv_pool_size here in units of 1 kB. InnoDB internally
        changes the value so that it becomes the number of database pages. */
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        if (innobase_buffer_pool_awe_mem_mb == 0) {
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                /* Careful here: we first convert the signed long int to ulint
                and only after that divide */
 
                srv_pool_size = ((ulint) innobase_buffer_pool_size) / 1024;
        } else {
                srv_use_awe = TRUE;
                srv_pool_size = (ulint)
                                (1024 * innobase_buffer_pool_awe_mem_mb);
                srv_awe_window_size = (ulint) innobase_buffer_pool_size;
 
                /* Note that what the user specified as
                innodb_buffer_pool_size is actually the AWE memory window
                size in this case, and the real buffer pool size is
                determined by .._awe_mem_mb. */
        }
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	srv_mem_pool_size = (ulint) innobase_additional_mem_pool_size;

	srv_n_file_io_threads = (ulint) innobase_file_io_threads;
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	srv_lock_wait_timeout = (ulint) innobase_lock_wait_timeout;
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	srv_thread_concurrency = (ulint) innobase_thread_concurrency;
	srv_force_recovery = (ulint) innobase_force_recovery;

	srv_fast_shutdown = (ibool) innobase_fast_shutdown;
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	srv_file_per_table = (ibool) innobase_file_per_table;
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        srv_locks_unsafe_for_binlog = (ibool) innobase_locks_unsafe_for_binlog;
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	srv_max_n_open_files = (ulint) innobase_open_files;
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	srv_innodb_status = (ibool) innobase_create_status_file;
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	srv_print_verbose_log = mysqld_embedded ? 0 : 1;
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		/* Store the default charset-collation number of this MySQL
	installation */

	data_mysql_default_charset_coll = (ulint)default_charset_info->number;

	data_mysql_latin1_swedish_charset_coll =
					(ulint)my_charset_latin1.number;

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	/* Store the latin1_swedish_ci character ordering table to InnoDB. For
	non-latin1_swedish_ci charsets we use the MySQL comparison functions,
	and consequently we do not need to know the ordering internally in
	InnoDB. */
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	ut_a(0 == strcmp((char*)my_charset_latin1.name,
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						(char*)"latin1_swedish_ci"));
	memcpy(srv_latin1_ordering, my_charset_latin1.sort_order, 256);
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	/* Since we in this module access directly the fields of a trx
        struct, and due to different headers and flags it might happen that
	mutex_t has a different size in this module and in InnoDB
	modules, we check at run time that the size is the same in
	these compilation modules. */

	srv_sizeof_trx_t_in_ha_innodb_cc = sizeof(trx_t);

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	err = innobase_start_or_create_for_mysql();
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	if (err != DB_SUCCESS) {

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		DBUG_RETURN(1);
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	}
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	(void) hash_init(&innobase_open_tables,system_charset_info, 32, 0, 0,
			 		(hash_get_key) innobase_get_key, 0, 0);
	pthread_mutex_init(&innobase_mutex, MY_MUTEX_INIT_FAST);
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	innodb_inited= 1;
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	/* If this is a replication slave and we needed to do a crash recovery,
	set the master binlog position to what InnoDB internally knew about
	how far we got transactions durable inside InnoDB. There is a
	problem here: if the user used also MyISAM tables, InnoDB might not
	know the right position for them.

	THIS DOES NOT WORK CURRENTLY because replication seems to initialize
	glob_mi also after innobase_init. */
	
/*	if (trx_sys_mysql_master_log_pos != -1) {
		ut_memcpy(glob_mi.log_file_name, trx_sys_mysql_master_log_name,
				1 + ut_strlen(trx_sys_mysql_master_log_name));
		glob_mi.pos = trx_sys_mysql_master_log_pos;
	}
*/
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  	DBUG_RETURN(0);
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}

/***********************************************************************
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Closes an InnoDB database. */
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bool
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innobase_end(void)
/*==============*/
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				/* out: TRUE if error */
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{
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	int	err= 0;
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	DBUG_ENTER("innobase_end");

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#ifdef __NETWARE__ 	/* some special cleanup for NetWare */
	if (nw_panic) {
		set_panic_flag_for_netware();
	}
#endif
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	if (innodb_inited)
	{
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	  if (innobase_very_fast_shutdown) {
	    srv_very_fast_shutdown = TRUE;
	    fprintf(stderr,
"InnoDB: MySQL has requested a very fast shutdown without flushing\n"
"InnoDB: the InnoDB buffer pool to data files. At the next mysqld startup\n"
"InnoDB: InnoDB will do a crash recovery!\n");

	  }

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	  innodb_inited= 0;
	  if (innobase_shutdown_for_mysql() != DB_SUCCESS)
	    err= 1;
	  hash_free(&innobase_open_tables);
	  my_free(internal_innobase_data_file_path,MYF(MY_ALLOW_ZERO_PTR));
	  pthread_mutex_destroy(&innobase_mutex);
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	}
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  	DBUG_RETURN(err);
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}

/********************************************************************
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Flushes InnoDB logs to disk and makes a checkpoint. Really, a commit flushes
the logs, and the name of this function should be innobase_checkpoint. */
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bool
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innobase_flush_logs(void)
/*=====================*/
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				/* out: TRUE if error */
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{
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  	bool 	result = 0;
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  	DBUG_ENTER("innobase_flush_logs");

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	log_buffer_flush_to_disk();
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  	DBUG_RETURN(result);
}

/*********************************************************************
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Commits a transaction in an InnoDB database. */
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void
innobase_commit_low(
/*================*/
	trx_t*	trx)	/* in: transaction handle */
{
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        if (trx->conc_state == TRX_NOT_STARTED) {
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                return;
        }
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#ifdef HAVE_REPLICATION
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        if (current_thd->slave_thread) {
                /* Update the replication position info inside InnoDB */
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                trx->mysql_master_log_file_name
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                                        = active_mi->rli.group_master_log_name;
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                trx->mysql_master_log_pos= ((ib_longlong)
                   			    active_mi->rli.future_group_master_log_pos);
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        }
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#endif /* HAVE_REPLICATION */
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	trx_commit_for_mysql(trx);
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}

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/*********************************************************************
Creates an InnoDB transaction struct for the thd if it does not yet have one.
Starts a new InnoDB transaction if a transaction is not yet started. And
assigns a new snapshot for a consistent read if the transaction does not yet
have one. */

int
innobase_start_trx_and_assign_read_view(
/*====================================*/
			/* out: 0 */
	THD*	thd)	/* in: MySQL thread handle of the user for whom
			the transaction should be committed */
{
	trx_t*	trx;

  	DBUG_ENTER("innobase_start_trx_and_assign_read_view");

	/* Create a new trx struct for thd, if it does not yet have one */

	trx = check_trx_exists(thd);

	/* This is just to play safe: release a possible FIFO ticket and
	search latch. Since we will reserve the kernel mutex, we have to
	release the search system latch first to obey the latching order. */

	innobase_release_stat_resources(trx);

	/* If the transaction is not started yet, start it */

	trx_start_if_not_started_noninline(trx);

	/* Assign a read view if the transaction does not have it yet */

	trx_assign_read_view(trx);

	/* Set the MySQL flag to mark that there is an active transaction */

	current_thd->transaction.all.innodb_active_trans = 1;

	DBUG_RETURN(0);
}

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/*********************************************************************
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Commits a transaction in an InnoDB database or marks an SQL statement
ended. */
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int
innobase_commit(
/*============*/
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			/* out: 0 */
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	THD*	thd,	/* in: MySQL thread handle of the user for whom
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			the transaction should be committed */
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	void*	trx_handle)/* in: InnoDB trx handle or
			&innodb_dummy_stmt_trx_handle: the latter means
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			that the current SQL statement ended */
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{
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	trx_t*	trx;
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  	DBUG_ENTER("innobase_commit");
  	DBUG_PRINT("trans", ("ending transaction"));

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	trx = check_trx_exists(thd);
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	/* Release a possible FIFO ticket and search latch. Since we will
	reserve the kernel mutex, we have to release the search system latch
	first to obey the latching order. */
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	innobase_release_stat_resources(trx);
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	/* The flag thd->transaction.all.innodb_active_trans is set to 1 in
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	1. ::external_lock(),
	2. ::start_stmt(),
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	3. innobase_query_caching_of_table_permitted(),
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	4. innobase_savepoint(),
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	5. ::init_table_handle_for_HANDLER(),
	6. innobase_start_trx_and_assign_read_view()
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	and it is only set to 0 in a commit or a rollback. If it is 0 we know
	there cannot be resources to be freed and we could return immediately.
	For the time being, we play safe and do the cleanup though there should
	be nothing to clean up. */
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	if (thd->transaction.all.innodb_active_trans == 0
	    && trx->conc_state != TRX_NOT_STARTED) {
	    
	        fprintf(stderr,
"InnoDB: Error: thd->transaction.all.innodb_active_trans == 0\n"
"InnoDB: but trx->conc_state != TRX_NOT_STARTED\n");
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	}
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	if (trx_handle != (void*)&innodb_dummy_stmt_trx_handle
	    || (!(thd->options & (OPTION_NOT_AUTOCOMMIT | OPTION_BEGIN)))) {
	        
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		/* We were instructed to commit the whole transaction, or
		this is an SQL statement end and autocommit is on */

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		innobase_commit_low(trx);
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		thd->transaction.all.innodb_active_trans = 0;
	} else {
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	        /* We just mark the SQL statement ended and do not do a
		transaction commit */

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		if (trx->auto_inc_lock) {
			/* If we had reserved the auto-inc lock for some
			table in this SQL statement we release it now */
		  	
			row_unlock_table_autoinc_for_mysql(trx);
		}
		/* Store the current undo_no of the transaction so that we
		know where to roll back if we have to roll back the next
		SQL statement */

		trx_mark_sql_stat_end(trx);
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	}
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	/* Tell the InnoDB server that there might be work for utility
	threads: */
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	srv_active_wake_master_thread();

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	DBUG_RETURN(0);
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}

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/*********************************************************************
This is called when MySQL writes the binlog entry for the current
transaction. Writes to the InnoDB tablespace info which tells where the
MySQL binlog entry for the current transaction ended. Also commits the
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transaction inside InnoDB but does NOT flush InnoDB log files to disk.
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To flush you have to call innobase_commit_complete(). We have separated
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flushing to eliminate the bottleneck of LOCK_log in log.cc which disabled
InnoDB's group commit capability. */
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int
innobase_report_binlog_offset_and_commit(
/*=====================================*/
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                                /* out: 0 */
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        THD*    thd,            /* in: user thread */
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        void*   trx_handle,     /* in: InnoDB trx handle */
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        char*   log_file_name,  /* in: latest binlog file name */
        my_off_t end_offset)    /* in: the offset in the binlog file
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                                   up to which we wrote */
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{
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	trx_t*	trx;

	trx = (trx_t*)trx_handle;
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	ut_a(trx != NULL);

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	trx->mysql_log_file_name = log_file_name;  	
	trx->mysql_log_offset = (ib_longlong)end_offset;
	
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	trx->flush_log_later = TRUE;

  	innobase_commit(thd, trx_handle);

	trx->flush_log_later = FALSE;

	return(0);
}

/*********************************************************************
This is called after MySQL has written the binlog entry for the current
transaction. Flushes the InnoDB log files to disk if required. */

int
innobase_commit_complete(
/*=====================*/
                                /* out: 0 */
        void*   trx_handle)     /* in: InnoDB trx handle */
{
	trx_t*	trx;

	if (srv_flush_log_at_trx_commit == 0) {

	        return(0);
	}

	trx = (trx_t*)trx_handle;

	ut_a(trx != NULL);

  	trx_commit_complete_for_mysql(trx);

	return(0);
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}

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/*********************************************************************
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Rolls back a transaction or the latest SQL statement. */
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int
innobase_rollback(
/*==============*/
			/* out: 0 or error number */
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	THD*	thd,	/* in: handle to the MySQL thread of the user
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			whose transaction should be rolled back */
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	void*	trx_handle)/* in: InnoDB trx handle or a dummy stmt handle;
			the latter means we roll back the latest SQL
			statement */
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{
	int	error = 0;
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	trx_t*	trx;
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	DBUG_ENTER("innobase_rollback");
	DBUG_PRINT("trans", ("aborting transaction"));

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	trx = check_trx_exists(thd);
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	/* Release a possible FIFO ticket and search latch. Since we will
	reserve the kernel mutex, we have to release the search system latch
	first to obey the latching order. */

	innobase_release_stat_resources(trx);

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        if (trx->auto_inc_lock) {
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		/* If we had reserved the auto-inc lock for some table (if
		we come here to roll back the latest SQL statement) we
		release it now before a possibly lengthy rollback */
		
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		row_unlock_table_autoinc_for_mysql(trx);
	}

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	if (trx_handle != (void*)&innodb_dummy_stmt_trx_handle
	    || (!(thd->options & (OPTION_NOT_AUTOCOMMIT | OPTION_BEGIN)))) {
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		error = trx_rollback_for_mysql(trx);
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		thd->transaction.all.innodb_active_trans = 0;
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	} else {
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		error = trx_rollback_last_sql_stat_for_mysql(trx);
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	}
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	DBUG_RETURN(convert_error_code_to_mysql(error, NULL));
}

/*********************************************************************
Rolls back a transaction to a savepoint. */

int
innobase_rollback_to_savepoint(
/*===========================*/
				/* out: 0 if success, HA_ERR_NO_SAVEPOINT if
				no savepoint with the given name */
	THD*	thd,		/* in: handle to the MySQL thread of the user
				whose transaction should be rolled back */
	char*	savepoint_name,	/* in: savepoint name */
	my_off_t* binlog_cache_pos)/* out: position which corresponds to the
				savepoint in the binlog cache of this
				transaction, not defined if error */
{
	ib_longlong mysql_binlog_cache_pos;
	int	    error = 0;
	trx_t*	    trx;

	DBUG_ENTER("innobase_rollback_to_savepoint");

	trx = check_trx_exists(thd);

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	/* Release a possible FIFO ticket and search latch. Since we will
	reserve the kernel mutex, we have to release the search system latch
	first to obey the latching order. */
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	innobase_release_stat_resources(trx);
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	error = trx_rollback_to_savepoint_for_mysql(trx, savepoint_name,
						&mysql_binlog_cache_pos);
	*binlog_cache_pos = (my_off_t)mysql_binlog_cache_pos;
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	DBUG_RETURN(convert_error_code_to_mysql(error, NULL));
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}

/*********************************************************************
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Sets a transaction savepoint. */

int
innobase_savepoint(
/*===============*/
				/* out: always 0, that is, always succeeds */
	THD*	thd,		/* in: handle to the MySQL thread */
	char*	savepoint_name,	/* in: savepoint name */
	my_off_t binlog_cache_pos)/* in: offset up to which the current
				transaction has cached log entries to its
				binlog cache, not defined if no transaction
				active, or we are in the autocommit state, or
				binlogging is not switched on */
{
	int	error = 0;
	trx_t*	trx;

	DBUG_ENTER("innobase_savepoint");

	if (!(thd->options & (OPTION_NOT_AUTOCOMMIT | OPTION_BEGIN))) {
		/* In the autocommit state there is no sense to set a
		savepoint: we return immediate success */
	        DBUG_RETURN(0);
	}

	trx = check_trx_exists(thd);

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	/* Release a possible FIFO ticket and search latch. Since we will
	reserve the kernel mutex, we have to release the search system latch
	first to obey the latching order. */

	innobase_release_stat_resources(trx);

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	/* Setting a savepoint starts a transaction inside InnoDB since
	it allocates resources for it (memory to store the savepoint name,
	for example) */

	thd->transaction.all.innodb_active_trans = 1;

	error = trx_savepoint_for_mysql(trx, savepoint_name,
					     (ib_longlong)binlog_cache_pos);

	DBUG_RETURN(convert_error_code_to_mysql(error, NULL));
}

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/*********************************************************************
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Frees a possible InnoDB trx object associated with the current THD. */
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int
innobase_close_connection(
/*======================*/
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			/* out: 0 or error number */
	THD*	thd)	/* in: handle to the MySQL thread of the user
			whose transaction should be rolled back */
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{
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	trx_t*	trx;
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	trx = (trx_t*)thd->transaction.all.innobase_tid;
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	if (NULL != trx) {
	        innobase_rollback(thd, (void*)trx);
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		trx_free_for_mysql(trx);
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		thd->transaction.all.innobase_tid = NULL;
	}
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	return(0);
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}
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/*****************************************************************************
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** InnoDB database tables
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*****************************************************************************/

/********************************************************************
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Gives the file extension of an InnoDB single-table tablespace. */
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const char**
ha_innobase::bas_ext() const
/*========================*/
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				/* out: file extension string */
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{
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	static const char* ext[] = {".ibd", NullS};
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	return(ext);
}

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/*********************************************************************
Normalizes a table name string. A normalized name consists of the
database name catenated to '/' and table name. An example:
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test/mytable. On Windows normalization puts both the database name and the
table name always to lower case. */
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static
void
normalize_table_name(
/*=================*/
	char*		norm_name,	/* out: normalized name as a
					null-terminated string */
	const char*	name)		/* in: table name string */
{
	char*	name_ptr;
	char*	db_ptr;
	char*	ptr;

	/* Scan name from the end */

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	ptr = strend(name)-1;
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	while (ptr >= name && *ptr != '\\' && *ptr != '/') {
		ptr--;
	}

	name_ptr = ptr + 1;

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	DBUG_ASSERT(ptr > name);
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	ptr--;
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	while (ptr >= name && *ptr != '\\' && *ptr != '/') {
		ptr--;
	}

	db_ptr = ptr + 1;

	memcpy(norm_name, db_ptr, strlen(name) + 1 - (db_ptr - name));

	norm_name[name_ptr - db_ptr - 1] = '/';
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#ifdef __WIN__
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	innobase_casedn_str(norm_name);
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#endif
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}
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/*********************************************************************
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Creates and opens a handle to a table which already exists in an InnoDB
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database. */

int
ha_innobase::open(
/*==============*/
					/* out: 1 if error, 0 if success */
	const char*	name,		/* in: table name */
	int 		mode,		/* in: not used */
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	uint 		test_if_locked)	/* in: not used */
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{
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	dict_table_t*	ib_table;
  	char		norm_name[1000];
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	THD*		thd;
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	DBUG_ENTER("ha_innobase::open");

	UT_NOT_USED(mode);
	UT_NOT_USED(test_if_locked);

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	thd = current_thd;
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	normalize_table_name(norm_name, name);

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	user_thd = NULL;

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	last_query_id = (ulong)-1;

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	if (!(share=get_share(name))) {

		DBUG_RETURN(1);
	}
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	/* Create buffers for packing the fields of a record. Why
	table->reclength did not work here? Obviously, because char
	fields when packed actually became 1 byte longer, when we also
	stored the string length as the first byte. */
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	upd_and_key_val_buff_len = table->reclength + table->max_key_length
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							+ MAX_REF_PARTS * 3;
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	if (!(mysql_byte*) my_multi_malloc(MYF(MY_WME),
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				     &upd_buff, upd_and_key_val_buff_len,
				     &key_val_buff, upd_and_key_val_buff_len,
1612
				     NullS)) {
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	  	free_share(share);
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	  	DBUG_RETURN(1);
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  	}

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	/* Get pointer to a table object in InnoDB dictionary cache */
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	ib_table = dict_table_get_and_increment_handle_count(
				      		     norm_name, NULL);
 	if (NULL == ib_table) {
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	        ut_print_timestamp(stderr);
	        fprintf(stderr, "  InnoDB error:\n"
"Cannot find table %s from the internal data dictionary\n"
"of InnoDB though the .frm file for the table exists. Maybe you\n"
"have deleted and recreated InnoDB data files but have forgotten\n"
"to delete the corresponding .frm files of InnoDB tables, or you\n"
"have moved .frm files to another database?\n"
"Look from section 15.1 of http://www.innodb.com/ibman.html\n"
"how you can resolve the problem.\n",
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			  norm_name);
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	        free_share(share);
    		my_free((char*) upd_buff, MYF(0));
    		my_errno = ENOENT;
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    		DBUG_RETURN(1);
  	}

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 	if (ib_table->ibd_file_missing && !thd->tablespace_op) {
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	        ut_print_timestamp(stderr);
	        fprintf(stderr, "  InnoDB error:\n"
"MySQL is trying to open a table handle but the .ibd file for\n"
"table %s does not exist.\n"
"Have you deleted the .ibd file from the database directory under\n"
"the MySQL datadir, or have you used DISCARD TABLESPACE?\n"
"Look from section 15.1 of http://www.innodb.com/ibman.html\n"
"how you can resolve the problem.\n",
			  norm_name);
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	        free_share(share);
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    		my_free((char*) upd_buff, MYF(0));
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    		my_errno = ENOENT;
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    		DBUG_RETURN(1);
  	}

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	innobase_prebuilt = row_create_prebuilt(ib_table);
1658

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	((row_prebuilt_t*)innobase_prebuilt)->mysql_row_len = table->reclength;
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	/* Looks like MySQL-3.23 sometimes has primary key number != 0 */

 	primary_key = table->primary_key;
	key_used_on_scan = primary_key;
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	/* Allocate a buffer for a 'row reference'. A row reference is
	a string of bytes of length ref_length which uniquely specifies
        a row in our table. Note that MySQL may also compare two row
        references for equality by doing a simple memcmp on the strings
        of length ref_length! */
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  	if (!row_table_got_default_clust_index(ib_table)) {
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	        if (primary_key >= MAX_KEY) {
	                fprintf(stderr,
		    "InnoDB: Error: table %s has a primary key in InnoDB\n"
		    "InnoDB: data dictionary, but not in MySQL!\n", name);
		}
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		((row_prebuilt_t*)innobase_prebuilt)
				->clust_index_was_generated = FALSE;
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 		/*
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		  MySQL allocates the buffer for ref. key_info->key_length
		  includes space for all key columns + one byte for each column
		  that may be NULL. ref_length must be as exact as possible to
		  save space, because all row reference buffers are allocated
		  based on ref_length.
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		*/
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  		ref_length = table->key_info[primary_key].key_length;
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	} else {
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	        if (primary_key != MAX_KEY) {
	                fprintf(stderr,
		    "InnoDB: Error: table %s has no primary key in InnoDB\n"
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		    "InnoDB: data dictionary, but has one in MySQL!\n"
		    "InnoDB: If you created the table with a MySQL\n"
                    "InnoDB: version < 3.23.54 and did not define a primary\n"
                    "InnoDB: key, but defined a unique key with all non-NULL\n"
                    "InnoDB: columns, then MySQL internally treats that key\n"
                    "InnoDB: as the primary key. You can fix this error by\n"
		    "InnoDB: dump + DROP + CREATE + reimport of the table.\n",
				name);
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		}

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		((row_prebuilt_t*)innobase_prebuilt)
				->clust_index_was_generated = TRUE;

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  		ref_length = DATA_ROW_ID_LEN;
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		/*
		  If we automatically created the clustered index, then
		  MySQL does not know about it, and MySQL must NOT be aware
		  of the index used on scan, to make it avoid checking if we
		  update the column of the index. That is why we assert below
		  that key_used_on_scan is the undefined value MAX_KEY.
		  The column is the row id in the automatical generation case,
		  and it will never be updated anyway.
		*/
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		if (key_used_on_scan != MAX_KEY) {
	                fprintf(stderr,
"InnoDB: Warning: table %s key_used_on_scan is %lu even though there is no\n"
"InnoDB: primary key inside InnoDB.\n",
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				name, (ulong)key_used_on_scan);
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		}
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	}
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Merge  
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	auto_inc_counter_for_this_stat = 0;

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	block_size = 16 * 1024;	/* Index block size in InnoDB: used by MySQL
				in query optimization */

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	/* Init table lock structure */
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	thr_lock_data_init(&share->lock,&lock,(void*) 0);
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  	info(HA_STATUS_NO_LOCK | HA_STATUS_VARIABLE | HA_STATUS_CONST);
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  	DBUG_RETURN(0);
}

/**********************************************************************
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Closes a handle to an InnoDB table. */
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int
ha_innobase::close(void)
/*====================*/
				/* out: error number */
{
  	DBUG_ENTER("ha_innobase::close");

	row_prebuilt_free((row_prebuilt_t*) innobase_prebuilt);

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    	my_free((char*) upd_buff, MYF(0));
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        free_share(share);

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	/* Tell InnoDB server that there might be work for
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	utility threads: */

	srv_active_wake_master_thread();

  	DBUG_RETURN(0);
}

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/* The following accessor functions should really be inside MySQL code! */

/******************************************************************
Gets field offset for a field in a table. */
inline
uint
get_field_offset(
/*=============*/
			/* out: offset */
	TABLE*	table,	/* in: MySQL table object */
	Field*	field)	/* in: MySQL field object */
{
	return((uint) (field->ptr - (char*) table->record[0]));
}

/******************************************************************
Checks if a field in a record is SQL NULL. Uses the record format
information in table to track the null bit in record. */
inline
uint
field_in_record_is_null(
/*====================*/
			/* out: 1 if NULL, 0 otherwise */
	TABLE*	table,	/* in: MySQL table object */
	Field*	field,	/* in: MySQL field object */
	char*	record)	/* in: a row in MySQL format */
{
	int	null_offset;

	if (!field->null_ptr) {

		return(0);
	}

	null_offset = (uint) ((char*) field->null_ptr
					- (char*) table->record[0]);

	if (record[null_offset] & field->null_bit) {

		return(1);
	}

	return(0);
}

/******************************************************************
Sets a field in a record to SQL NULL. Uses the record format
information in table to track the null bit in record. */
inline
void
set_field_in_record_to_null(
/*========================*/
	TABLE*	table,	/* in: MySQL table object */
	Field*	field,	/* in: MySQL field object */
	char*	record)	/* in: a row in MySQL format */
{
	int	null_offset;

	null_offset = (uint) ((char*) field->null_ptr
					- (char*) table->record[0]);

	record[null_offset] = record[null_offset] | field->null_bit;
}

/******************************************************************
Resets SQL NULL bits in a record to zero. */
inline
void
reset_null_bits(
/*============*/
	TABLE*	table,	/* in: MySQL table object */
	char*	record)	/* in: a row in MySQL format */
{
	bzero(record, table->null_bytes);
}

1839 1840
extern "C" {
/*****************************************************************
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InnoDB uses this function to compare two data fields for which the data type
is such that we must use MySQL code to compare them. NOTE that the prototype
of this function is in rem0cmp.c in InnoDB source code! If you change this
function, remember to update the prototype there! */
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int
innobase_mysql_cmp(
1848
/*===============*/
1849 1850
					/* out: 1, 0, -1, if a is greater,
					equal, less than b, respectively */
1851
	int		mysql_type,	/* in: MySQL type */
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	uint		charset_number,	/* in: number of the charset */
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	unsigned char*	a,		/* in: data field */
	unsigned int	a_length,	/* in: data field length,
					not UNIV_SQL_NULL */
	unsigned char*	b,		/* in: data field */
	unsigned int	b_length)	/* in: data field length,
					not UNIV_SQL_NULL */
{
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	CHARSET_INFO*		charset;
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	enum_field_types	mysql_tp;
1862
	int                     ret;
1863

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	DBUG_ASSERT(a_length != UNIV_SQL_NULL);
	DBUG_ASSERT(b_length != UNIV_SQL_NULL);
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	mysql_tp = (enum_field_types) mysql_type;

	switch (mysql_tp) {

	case FIELD_TYPE_STRING:
	case FIELD_TYPE_VAR_STRING:
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	case FIELD_TYPE_TINY_BLOB:
	case FIELD_TYPE_MEDIUM_BLOB:
	case FIELD_TYPE_BLOB:
	case FIELD_TYPE_LONG_BLOB:
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		/* Use the charset number to pick the right charset struct for
		the comparison. Since the MySQL function get_charset may be
		slow before Bar removes the mutex operation there, we first
		look at 2 common charsets directly. */

		if (charset_number == default_charset_info->number) {
			charset = default_charset_info;
		} else if (charset_number == my_charset_latin1.number) {
			charset = &my_charset_latin1;
		} else {
			charset = get_charset(charset_number, MYF(MY_WME));

			if (charset == NULL) {
				fprintf(stderr,
"InnoDB: fatal error: InnoDB needs charset %lu for doing a comparison,\n"
"InnoDB: but MySQL cannot find that charset.\n", (ulong)charset_number);
				ut_a(0);
			}
		}

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                /* Starting from 4.1.3, we use strnncollsp() in comparisons of
                non-latin1_swedish_ci strings. NOTE that the collation order
                changes then: 'b\0\0...' is ordered BEFORE 'b  ...'. Users
                having indexes on such data need to rebuild their tables! */

                ret = charset->coll->strnncollsp(charset,
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                                  a, a_length,
                                  b, b_length);
1905
		if (ret < 0) {
1906
		        return(-1);
1907
		} else if (ret > 0) {
1908
		        return(1);
1909
		} else {
1910
		        return(0);
1911
	        }
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	default:
		assert(0);
	}

	return(0);
}
}

/******************************************************************
1921
Converts a MySQL type to an InnoDB type. */
1922 1923
inline
ulint
1924 1925 1926
get_innobase_type_from_mysql_type(
/*==============================*/
			/* out: DATA_BINARY, DATA_VARCHAR, ... */
1927 1928
	Field*	field)	/* in: MySQL field */
{
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	/* The following asserts try to check that the MySQL type code fits in
	8 bits: this is used in ibuf and also when DATA_NOT_NULL is ORed to
	the type */
1932

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1933 1934 1935 1936 1937
	DBUG_ASSERT((ulint)FIELD_TYPE_STRING < 256);
	DBUG_ASSERT((ulint)FIELD_TYPE_VAR_STRING < 256);
	DBUG_ASSERT((ulint)FIELD_TYPE_DOUBLE < 256);
	DBUG_ASSERT((ulint)FIELD_TYPE_FLOAT < 256);
	DBUG_ASSERT((ulint)FIELD_TYPE_DECIMAL < 256);
1938 1939

	switch (field->type()) {
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1940 1941
	        /* NOTE that we only allow string types in DATA_MYSQL
		and DATA_VARMYSQL */
1942
		case FIELD_TYPE_VAR_STRING: if (field->binary()) {
1943 1944 1945

						return(DATA_BINARY);
					} else if (strcmp(
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						  field->charset()->name,
						 "latin1_swedish_ci") == 0) {
1948
						return(DATA_VARCHAR);
1949 1950
					} else {
						return(DATA_VARMYSQL);
1951
					}
1952
		case FIELD_TYPE_STRING: if (field->binary()) {
1953 1954 1955

						return(DATA_FIXBINARY);
					} else if (strcmp(
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						   field->charset()->name,
						   "latin1_swedish_ci") == 0) {
1958
						return(DATA_CHAR);
1959 1960
					} else {
						return(DATA_MYSQL);
1961
					}
1962 1963 1964 1965 1966 1967 1968 1969 1970 1971 1972
		case FIELD_TYPE_LONG:
		case FIELD_TYPE_LONGLONG:
		case FIELD_TYPE_TINY:
		case FIELD_TYPE_SHORT:
		case FIELD_TYPE_INT24:
		case FIELD_TYPE_DATE:
		case FIELD_TYPE_DATETIME:
		case FIELD_TYPE_YEAR:
		case FIELD_TYPE_NEWDATE:
		case FIELD_TYPE_ENUM:
		case FIELD_TYPE_SET:
1973 1974 1975
		case FIELD_TYPE_TIME:
		case FIELD_TYPE_TIMESTAMP:
					return(DATA_INT);
1976
		case FIELD_TYPE_FLOAT:
1977
					return(DATA_FLOAT);
1978
		case FIELD_TYPE_DOUBLE:
1979
					return(DATA_DOUBLE);
1980
		case FIELD_TYPE_DECIMAL:
1981 1982 1983 1984 1985 1986
					return(DATA_DECIMAL);
		case FIELD_TYPE_TINY_BLOB:
		case FIELD_TYPE_MEDIUM_BLOB:
		case FIELD_TYPE_BLOB:
		case FIELD_TYPE_LONG_BLOB:
					return(DATA_BLOB);
1987 1988 1989 1990 1991 1992
		default:
					assert(0);
	}

	return(0);
}
1993

1994
/***********************************************************************
1995
Stores a key value for a row to a buffer. */
1996 1997 1998 1999 2000 2001 2002

uint
ha_innobase::store_key_val_for_row(
/*===============================*/
				/* out: key value length as stored in buff */
	uint 		keynr,	/* in: key number */
	char*		buff,	/* in/out: buffer for the key value (in MySQL
2003 2004
				format) */
	uint		buff_len,/* in: buffer length */
2005
	const mysql_byte* record)/* in: row in MySQL format */
2006 2007 2008 2009 2010
{
	KEY*		key_info 	= table->key_info + keynr;
  	KEY_PART_INFO*	key_part	= key_info->key_part;
  	KEY_PART_INFO*	end		= key_part + key_info->key_parts;
	char*		buff_start	= buff;
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	enum_field_types mysql_type;
	Field*		field;
	ulint		blob_len;
	byte*		blob_data;
	ibool		is_null;
2016

2017 2018
  	DBUG_ENTER("store_key_val_for_row");

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	/* The format for storing a key field in MySQL is the following:

	1. If the column can be NULL, then in the first byte we put 1 if the
	field value is NULL, 0 otherwise.

	2. If the column is of a BLOB type (it must be a column prefix field
	in this case), then we put the length of the data in the field to the
	next 2 bytes, in the little-endian format. If the field is SQL NULL,
	then these 2 bytes are set to 0. Note that the length of data in the
	field is <= column prefix length.

	3. In a column prefix field, prefix_len next bytes are reserved for
	data. In a normal field the max field length next bytes are reserved
	for data. For a VARCHAR(n) the max field length is n. If the stored
	value is the SQL NULL then these data bytes are set to 0. */	

2035 2036 2037
	/* We have to zero-fill the buffer so that MySQL is able to use a
	simple memcmp to compare two key values to determine if they are
	equal. MySQL does this to compare contents of two 'ref' values. */
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2038

2039
	bzero(buff, buff_len);
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2040

2041
  	for (; key_part != end; key_part++) {
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2042
	        is_null = FALSE;
2043 2044 2045 2046

    		if (key_part->null_bit) {
      			if (record[key_part->null_offset]
						& key_part->null_bit) {
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				*buff = 1;
				is_null = TRUE;
      			} else {
				*buff = 0;
			}
			buff++;
2053
    		}
2054

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		field = key_part->field;
		mysql_type = field->type();

		if (mysql_type == FIELD_TYPE_TINY_BLOB
		    || mysql_type == FIELD_TYPE_MEDIUM_BLOB
		    || mysql_type == FIELD_TYPE_BLOB
		    || mysql_type == FIELD_TYPE_LONG_BLOB) {
2062

2063
			ut_a(key_part->key_part_flag & HA_PART_KEY_SEG);
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		        if (is_null) {
				 buff += key_part->length + 2;
				 
				 continue;
			}
		    
		        blob_data = row_mysql_read_blob_ref(&blob_len,
				(byte*) (record
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				+ (ulint)get_field_offset(table, field)),
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					(ulint) field->pack_length());

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			ut_a(get_field_offset(table, field)
						     == key_part->offset);
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			if (blob_len > key_part->length) {
			        blob_len = key_part->length;
			}

			/* MySQL reserves 2 bytes for the length and the
			storage of the number is little-endian */

			ut_a(blob_len < 256);
2086
			*((byte*)buff) = (byte)blob_len;
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			buff += 2;

			memcpy(buff, blob_data, blob_len);

			buff += key_part->length;
		} else {
		        if (is_null) {
				 buff += key_part->length;
				 
				 continue;
			}
			memcpy(buff, record + key_part->offset,
							key_part->length);
			buff += key_part->length;
		}
2102 2103
  	}

2104
	ut_a(buff <= buff_start + buff_len);
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	DBUG_RETURN((uint)(buff - buff_start));
2107 2108 2109
}

/******************************************************************
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Builds a 'template' to the prebuilt struct. The template is used in fast
retrieval of just those column values MySQL needs in its processing. */
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static
2113
void
2114 2115 2116 2117 2118 2119 2120 2121 2122
build_template(
/*===========*/
	row_prebuilt_t*	prebuilt,	/* in: prebuilt struct */
	THD*		thd,		/* in: current user thread, used
					only if templ_type is
					ROW_MYSQL_REC_FIELDS */
	TABLE*		table,		/* in: MySQL table */
	ulint		templ_type)	/* in: ROW_MYSQL_WHOLE_ROW or
					ROW_MYSQL_REC_FIELDS */
2123
{
2124 2125
	dict_index_t*	index;
	dict_index_t*	clust_index;
2126
	mysql_row_templ_t* templ;
2127
	Field*		field;
2128 2129
	ulint		n_fields;
	ulint		n_requested_fields	= 0;
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	ibool		fetch_all_in_key	= FALSE;
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	ibool		fetch_primary_key_cols	= FALSE;
2132
	ulint		i;
2133

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	if (prebuilt->select_lock_type == LOCK_X) {
		/* We always retrieve the whole clustered index record if we
		use exclusive row level locks, for example, if the read is
		done in an UPDATE statement. */
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	        templ_type = ROW_MYSQL_WHOLE_ROW;
	}

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	if (templ_type == ROW_MYSQL_REC_FIELDS) {
	     if (prebuilt->hint_need_to_fetch_extra_cols
						== ROW_RETRIEVE_ALL_COLS) {
2145

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		/* We know we must at least fetch all columns in the key, or
		all columns in the table */
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		if (prebuilt->read_just_key) {
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			/* MySQL has instructed us that it is enough to
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			fetch the columns in the key; looks like MySQL
			can set this flag also when there is only a
			prefix of the column in the key: in that case we
			retrieve the whole column from the clustered
			index */
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			fetch_all_in_key = TRUE;
		} else {
			templ_type = ROW_MYSQL_WHOLE_ROW;
		}
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	    } else if (prebuilt->hint_need_to_fetch_extra_cols
						== ROW_RETRIEVE_PRIMARY_KEY) {
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		/* We must at least fetch all primary key cols. Note that if
		the clustered index was internally generated by InnoDB on the
		row id (no primary key was defined), then
		row_search_for_mysql() will always retrieve the row id to a
		special buffer in the prebuilt struct. */
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		fetch_primary_key_cols = TRUE;
	    }
2171 2172
	}

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	clust_index = dict_table_get_first_index_noninline(prebuilt->table);
2174

2175
	if (templ_type == ROW_MYSQL_REC_FIELDS) {
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		index = prebuilt->index;
2177 2178
	} else {
		index = clust_index;
2179
	}
2180

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	if (index == clust_index) {
		prebuilt->need_to_access_clustered = TRUE;
	} else {
		prebuilt->need_to_access_clustered = FALSE;
		/* Below we check column by column if we need to access
		the clustered index */
	}
2188

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	n_fields = (ulint)table->fields; /* number of columns */
2190 2191 2192 2193 2194 2195

	if (!prebuilt->mysql_template) {
		prebuilt->mysql_template = (mysql_row_templ_t*)
						mem_alloc_noninline(
					n_fields * sizeof(mysql_row_templ_t));
	}
2196

2197 2198
	prebuilt->template_type = templ_type;
	prebuilt->null_bitmap_len = table->null_bytes;
2199

2200 2201
	prebuilt->templ_contains_blob = FALSE;

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	/* Note that in InnoDB, i is the column number. MySQL calls columns
	'fields'. */
2204
	for (i = 0; i < n_fields; i++) {
2205
		templ = prebuilt->mysql_template + n_requested_fields;
2206 2207
		field = table->field[i];

2208
		if (templ_type == ROW_MYSQL_REC_FIELDS
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		    && !(fetch_all_in_key
			 && dict_index_contains_col_or_prefix(index, i))
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		    && !(fetch_primary_key_cols
			 && dict_table_col_in_clustered_key(index->table, i))
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		    && thd->query_id != field->query_id) {

			/* This field is not needed in the query, skip it */
2216 2217 2218 2219 2220

			goto skip_field;
		}

		n_requested_fields++;
2221

2222
		templ->col_no = i;
2223

2224 2225 2226
		if (index == clust_index) {
			templ->rec_field_no = (index->table->cols + i)
								->clust_pos;
2227
		} else {
2228 2229
			templ->rec_field_no = dict_index_get_nth_col_pos(
								index, i);
2230 2231
		}

2232 2233 2234 2235 2236 2237 2238 2239
		if (templ->rec_field_no == ULINT_UNDEFINED) {
			prebuilt->need_to_access_clustered = TRUE;
		}

		if (field->null_ptr) {
			templ->mysql_null_byte_offset =
				(ulint) ((char*) field->null_ptr
					- (char*) table->record[0]);
2240

2241 2242 2243 2244
			templ->mysql_null_bit_mask = (ulint) field->null_bit;
		} else {
			templ->mysql_null_bit_mask = 0;
		}
2245

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		templ->mysql_col_offset = (ulint)
					get_field_offset(table, field);

2249 2250
		templ->mysql_col_len = (ulint) field->pack_length();
		templ->type = get_innobase_type_from_mysql_type(field);
2251 2252
		templ->charset = dtype_get_charset_coll_noninline(
				index->table->cols[i].type.prtype);
2253
		templ->is_unsigned = (ulint) (field->flags & UNSIGNED_FLAG);
2254

2255 2256
		if (templ->type == DATA_BLOB) {
			prebuilt->templ_contains_blob = TRUE;
2257
		}
2258 2259 2260
skip_field:
		;
	}
2261

2262
	prebuilt->n_template = n_requested_fields;
2263

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2264
	if (index != clust_index && prebuilt->need_to_access_clustered) {
2265 2266 2267 2268
		/* Change rec_field_no's to correspond to the clustered index
		record */
		for (i = 0; i < n_requested_fields; i++) {
			templ = prebuilt->mysql_template + i;
2269

2270 2271 2272
			templ->rec_field_no =
			    (index->table->cols + templ->col_no)->clust_pos;
		}
2273
	}
2274 2275 2276
}

/************************************************************************
2277
Stores a row in an InnoDB database, to the table specified in this
2278 2279 2280 2281 2282
handle. */

int
ha_innobase::write_row(
/*===================*/
2283 2284
				/* out: error code */
	mysql_byte* 	record)	/* in: a row in MySQL format */
2285
{
2286
	row_prebuilt_t* prebuilt = (row_prebuilt_t*)innobase_prebuilt;
2287
  	int 		error;
2288
	longlong	auto_inc;
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2289
	longlong	dummy;
2290 2291
	ibool           incremented_auto_inc_for_stat = FALSE;
	ibool           incremented_auto_inc_counter = FALSE;
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2292
	ibool           skip_auto_inc_decr;
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2293

2294
  	DBUG_ENTER("ha_innobase::write_row");
2295

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	if (prebuilt->trx !=
			(trx_t*) current_thd->transaction.all.innobase_tid) {
		fprintf(stderr,
"InnoDB: Error: the transaction object for the table handle is at\n"
2300 2301 2302 2303 2304 2305 2306 2307 2308
"InnoDB: %p, but for the current thread it is at %p\n",
			prebuilt->trx,
			current_thd->transaction.all.innobase_tid);
		fputs("InnoDB: Dump of 200 bytes around prebuilt: ", stderr);
		ut_print_buf(stderr, ((const byte*)prebuilt) - 100, 200);
		fputs("\n"
			"InnoDB: Dump of 200 bytes around transaction.all: ",
			stderr);
		ut_print_buf(stderr,
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2309
			((byte*)(&(current_thd->transaction.all))) - 100, 200);
2310 2311
		putc('\n', stderr);
		ut_error;
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	}
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2314 2315
  	statistic_increment(ha_write_count, &LOCK_status);

2316 2317
        if (table->timestamp_field_type & TIMESTAMP_AUTO_SET_ON_INSERT)
                table->timestamp_field->set_time();
2318

2319
	if (user_thd->lex->sql_command == SQLCOM_ALTER_TABLE
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2320
	    && num_write_row >= 10000) {
2321 2322 2323 2324 2325 2326 2327 2328
		/* ALTER TABLE is COMMITted at every 10000 copied rows.
		The IX table lock for the original table has to be re-issued.
		As this method will be called on a temporary table where the
		contents of the original table is being copied to, it is
		a bit tricky to determine the source table.  The cursor
		position in the source table need not be adjusted after the
		intermediate COMMIT, since writes by other transactions are
		being blocked by a MySQL table lock TL_WRITE_ALLOW_READ. */
2329

2330
		dict_table_t*	src_table;
2331 2332
		ibool		mode;

2333
		num_write_row = 0;
2334

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		/* Commit the transaction.  This will release the table
		locks, so they have to be acquired again. */
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		/* Altering an InnoDB table */
		/* Get the source table. */
		src_table = lock_get_src_table(
				prebuilt->trx, prebuilt->table, &mode);
		if (!src_table) {
		no_commit:
			/* Unknown situation: do not commit */
			/*
			ut_print_timestamp(stderr);
			fprintf(stderr,
				"  InnoDB error: ALTER TABLE is holding lock"
				" on %lu tables!\n",
				prebuilt->trx->mysql_n_tables_locked);
			*/
			;
		} else if (src_table == prebuilt->table) {
			/* Source table is not in InnoDB format:
			no need to re-acquire locks on it. */

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			/* Altering to InnoDB format */
			innobase_commit(user_thd, prebuilt->trx);
			/* Note that this transaction is still active. */
			user_thd->transaction.all.innodb_active_trans = 1;
			/* We will need an IX lock on the destination table. */
		        prebuilt->sql_stat_start = TRUE;
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		} else {
			/* Ensure that there are no other table locks than
			LOCK_IX and LOCK_AUTO_INC on the destination table. */
			if (!lock_is_table_exclusive(prebuilt->table,
							prebuilt->trx)) {
2368 2369 2370 2371 2372 2373 2374 2375 2376
				goto no_commit;
			}

			/* Commit the transaction.  This will release the table
			locks, so they have to be acquired again. */
			innobase_commit(user_thd, prebuilt->trx);
			/* Note that this transaction is still active. */
			user_thd->transaction.all.innodb_active_trans = 1;
			/* Re-acquire the table lock on the source table. */
2377
			row_lock_table_for_mysql(prebuilt, src_table, mode);
2378 2379 2380
			/* We will need an IX lock on the destination table. */
		        prebuilt->sql_stat_start = TRUE;
		}
2381 2382
	}

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	num_write_row++;

2385 2386 2387
	if (last_query_id != user_thd->query_id) {
	        prebuilt->sql_stat_start = TRUE;
                last_query_id = user_thd->query_id;
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2388 2389

		innobase_release_stat_resources(prebuilt->trx);
2390 2391
	}

2392
  	if (table->next_number_field && record == table->record[0]) {
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		/* This is the case where the table has an
		auto-increment column */
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		/* Initialize the auto-inc counter if it has not been
		initialized yet */

		if (0 == dict_table_autoinc_peek(prebuilt->table)) {

			/* This call initializes the counter */
		        error = innobase_read_and_init_auto_inc(&dummy);

			if (error) {
				/* Deadlock or lock wait timeout */

				goto func_exit;
			}

			/* We have to set sql_stat_start to TRUE because
			the above call probably has called a select, and
			has reset that flag; row_insert_for_mysql has to
			know to set the IX intention lock on the table,
			something it only does at the start of each
			statement */

			prebuilt->sql_stat_start = TRUE;
		}

2420 2421
	        /* Fetch the value the user possibly has set in the
	        autoincrement field */
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2422

2423 2424
	        auto_inc = table->next_number_field->val_int();

2425 2426 2427
		/* In replication and also otherwise the auto-inc column 
		can be set with SET INSERT_ID. Then we must look at
		user_thd->next_insert_id. If it is nonzero and the user
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monty@donna.mysql.fi committed
2428 2429 2430
		has not supplied a value, we must use it, and use values
		incremented by 1 in all subsequent inserts within the
		same SQL statement! */
2431 2432

		if (auto_inc == 0 && user_thd->next_insert_id != 0) {
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2433 2434 2435

		        auto_inc_counter_for_this_stat
						= user_thd->next_insert_id;
2436
		}
2437

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2438 2439 2440 2441 2442 2443 2444 2445 2446 2447
		if (auto_inc == 0 && auto_inc_counter_for_this_stat) {
			/* The user set the auto-inc counter for
			this SQL statement with SET INSERT_ID. We must
			assign sequential values from the counter. */

			auto_inc = auto_inc_counter_for_this_stat;

			/* We give MySQL a new value to place in the
			auto-inc column */
			user_thd->next_insert_id = auto_inc;
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2448 2449 2450

			auto_inc_counter_for_this_stat++;
			incremented_auto_inc_for_stat = TRUE;
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2451
		}
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2452

2453
		if (auto_inc != 0) {
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2454 2455 2456
			/* This call will calculate the max of the current
			value and the value supplied by the user and
			update the counter accordingly */
2457 2458 2459 2460 2461 2462 2463 2464

			/* We have to use the transactional lock mechanism
			on the auto-inc counter of the table to ensure
			that replication and roll-forward of the binlog
			exactly imitates also the given auto-inc values.
			The lock is released at each SQL statement's
			end. */

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2465
			innodb_srv_conc_enter_innodb(prebuilt->trx);
2466
			error = row_lock_table_autoinc_for_mysql(prebuilt);
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2467
			innodb_srv_conc_exit_innodb(prebuilt->trx);
2468 2469

			if (error != DB_SUCCESS) {
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2470

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2471
				error = convert_error_code_to_mysql(error,
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2472
								    user_thd);
2473 2474
				goto func_exit;
			}	
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2475

2476 2477
			dict_table_autoinc_update(prebuilt->table, auto_inc);
		} else {
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2478
			innodb_srv_conc_enter_innodb(prebuilt->trx);
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2479

2480 2481 2482 2483 2484
			if (!prebuilt->trx->auto_inc_lock) {

				error = row_lock_table_autoinc_for_mysql(
								prebuilt);
				if (error != DB_SUCCESS) {
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2485 2486
 					innodb_srv_conc_exit_innodb(
							prebuilt->trx);
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2487

2488
					error = convert_error_code_to_mysql(
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2489
							error, user_thd);
2490 2491 2492 2493
					goto func_exit;
				}
			}	

2494 2495 2496
			/* The following call gets the value of the auto-inc
			counter of the table and increments it by 1 */

2497
			auto_inc = dict_table_autoinc_get(prebuilt->table);
2498 2499
			incremented_auto_inc_counter = TRUE;

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2500
			innodb_srv_conc_exit_innodb(prebuilt->trx);
2501

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2502 2503
			/* We can give the new value for MySQL to place in
			the field */
2504

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2505
			user_thd->next_insert_id = auto_inc;
2506
		}
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2507

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2508 2509 2510
		/* This call of a handler.cc function places
		user_thd->next_insert_id to the column value, if the column
		value was not set by the user */
2511

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2512 2513
    		update_auto_increment();
	}
2514

2515 2516 2517 2518
	if (prebuilt->mysql_template == NULL
			|| prebuilt->template_type != ROW_MYSQL_WHOLE_ROW) {
		/* Build the template used in converting quickly between
		the two database formats */
2519

2520 2521
		build_template(prebuilt, NULL, table, ROW_MYSQL_WHOLE_ROW);
	}
2522

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2523
	innodb_srv_conc_enter_innodb(prebuilt->trx);
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Merge  
monty@donna.mysql.fi committed
2524

2525
	error = row_insert_for_mysql((byte*) record, prebuilt);
2526

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heikki@hundin.mysql.fi committed
2527
	innodb_srv_conc_exit_innodb(prebuilt->trx);
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Merge  
monty@donna.mysql.fi committed
2528

2529 2530 2531
	if (error != DB_SUCCESS) {
	        /* If the insert did not succeed we restore the value of
		the auto-inc counter we used; note that this behavior was
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2532
		introduced only in version 4.0.4.
2533 2534
		NOTE that a REPLACE command and LOAD DATA INFILE REPLACE
		handles a duplicate key error
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2535
		itself, and we must not decrement the autoinc counter
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2536
		if we are performing those statements.
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2537 2538 2539 2540 2541
		NOTE 2: if there was an error, for example a deadlock,
		which caused InnoDB to roll back the whole transaction
		already in the call of row_insert_for_mysql(), we may no
		longer have the AUTO-INC lock, and cannot decrement
		the counter here. */
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2542 2543

	        skip_auto_inc_decr = FALSE;
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2544

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2545
	        if (error == DB_DUPLICATE_KEY
2546 2547
		    && (user_thd->lex->sql_command == SQLCOM_REPLACE
			|| user_thd->lex->sql_command
2548 2549 2550
			                 == SQLCOM_REPLACE_SELECT
		    	|| (user_thd->lex->sql_command == SQLCOM_LOAD
			    && user_thd->lex->duplicates == DUP_REPLACE))) {
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2551 2552 2553

		        skip_auto_inc_decr= TRUE;
		}
2554

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2555 2556
	        if (!skip_auto_inc_decr && incremented_auto_inc_counter
		    && prebuilt->trx->auto_inc_lock) {
2557
	                dict_table_autoinc_decrement(prebuilt->table);
2558 2559
	        }

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2560 2561
		if (!skip_auto_inc_decr && incremented_auto_inc_for_stat
		    && prebuilt->trx->auto_inc_lock) {
2562 2563 2564 2565
		        auto_inc_counter_for_this_stat--;
		}
	}

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2566
	error = convert_error_code_to_mysql(error, user_thd);
2567

2568
	/* Tell InnoDB server that there might be work for
2569
	utility threads: */
2570
func_exit:
2571
	innobase_active_small();
2572 2573 2574 2575

  	DBUG_RETURN(error);
}

2576
/******************************************************************
2577
Converts field data for storage in an InnoDB update vector. */
2578 2579 2580 2581 2582 2583 2584 2585 2586 2587
inline
mysql_byte*
innobase_convert_and_store_changed_col(
/*===================================*/
				/* out: pointer to the end of the converted
				data in the buffer */
	upd_field_t*	ufield,	/* in/out: field in the update vector */
	mysql_byte*	buf,	/* in: buffer we can use in conversion */
	mysql_byte*	data,	/* in: column data to store */
	ulint		len,	/* in: data len */
2588
	ulint		col_type,/* in: data type in InnoDB type numbers */
2589
	ulint		is_unsigned)/* in: != 0 if an unsigned integer type */
2590
{
2591 2592 2593 2594
	uint	i;

	if (len == UNIV_SQL_NULL) {
		data = NULL;
2595 2596
	} else if (col_type == DATA_VARCHAR || col_type == DATA_BINARY
		   || col_type == DATA_VARMYSQL) {
2597 2598 2599 2600
	        /* Remove trailing spaces */
        	while (len > 0 && data[len - 1] == ' ') {
	                len--;
	        }
2601
	} else if (col_type == DATA_INT) {
2602
		/* Store integer data in InnoDB in a big-endian
2603
		format, sign bit negated, if signed */
2604

2605 2606 2607 2608 2609 2610 2611 2612 2613 2614 2615
		for (i = 0; i < len; i++) {
			buf[len - 1 - i] = data[i];
		}

		if (!is_unsigned) {
			buf[0] = buf[0] ^ 128;
		}

		data = buf;

		buf += len;
2616
	}
2617 2618 2619 2620 2621 2622 2623 2624 2625 2626 2627 2628 2629 2630 2631 2632 2633 2634

	ufield->new_val.data = data;
	ufield->new_val.len = len;

	return(buf);
}

/**************************************************************************
Checks which fields have changed in a row and stores information
of them to an update vector. */
static
int
calc_row_difference(
/*================*/
					/* out: error number or 0 */
	upd_t*		uvect,		/* in/out: update vector */
	mysql_byte* 	old_row,	/* in: old row in MySQL format */
	mysql_byte* 	new_row,	/* in: new row in MySQL format */
2635 2636
	struct st_table* table,		/* in: table in MySQL data
					dictionary */
2637
	mysql_byte*	upd_buff,	/* in: buffer to use */
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2638
	ulint		buff_len,	/* in: buffer length */
2639
	row_prebuilt_t*	prebuilt,	/* in: InnoDB prebuilt struct */
2640 2641
	THD*		thd)		/* in: user thread */
{
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2642
	mysql_byte*	original_upd_buff = upd_buff;
2643
	Field*		field;
2644 2645 2646
	uint		n_fields;
	ulint		o_len;
	ulint		n_len;
2647 2648 2649
	byte*	        o_ptr;
        byte*	        n_ptr;
        byte*	        buf;
2650
	upd_field_t*	ufield;
2651 2652
	ulint		col_type;
	ulint		is_unsigned;
2653
	ulint		n_changed = 0;
2654
	uint		i;
2655 2656 2657

	n_fields = table->fields;

2658
	/* We use upd_buff to convert changed fields */
2659
	buf = (byte*) upd_buff;
2660

2661 2662 2663
	for (i = 0; i < n_fields; i++) {
		field = table->field[i];

2664
		/* if (thd->query_id != field->query_id) { */
2665 2666
			/* TODO: check that these fields cannot have
			changed! */
2667

2668 2669
		/*	goto skip_field;
		}*/
2670

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2671 2672
		o_ptr = (byte*) old_row + get_field_offset(table, field);
		n_ptr = (byte*) new_row + get_field_offset(table, field);
2673 2674 2675
		o_len = field->pack_length();
		n_len = field->pack_length();

2676
		col_type = get_innobase_type_from_mysql_type(field);
2677
		is_unsigned = (ulint) (field->flags & UNSIGNED_FLAG);
2678 2679 2680 2681 2682 2683 2684 2685 2686 2687

		switch (col_type) {

		case DATA_BLOB:
			o_ptr = row_mysql_read_blob_ref(&o_len, o_ptr, o_len);
			n_ptr = row_mysql_read_blob_ref(&n_len, n_ptr, n_len);
			break;
		case DATA_VARCHAR:
		case DATA_BINARY:
		case DATA_VARMYSQL:
2688 2689 2690 2691
			o_ptr = row_mysql_read_var_ref_noninline(&o_len,
								o_ptr);
			n_ptr = row_mysql_read_var_ref_noninline(&n_len,
								n_ptr);
2692 2693 2694
		default:
			;
		}
2695

2696
		if (field->null_ptr) {
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2697 2698
			if (field_in_record_is_null(table, field,
							(char*) old_row)) {
2699 2700
				o_len = UNIV_SQL_NULL;
			}
2701

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2702 2703
			if (field_in_record_is_null(table, field,
							(char*) new_row)) {
2704 2705 2706 2707 2708 2709 2710 2711 2712 2713
				n_len = UNIV_SQL_NULL;
			}
		}

		if (o_len != n_len || (o_len != UNIV_SQL_NULL &&
					0 != memcmp(o_ptr, n_ptr, o_len))) {
			/* The field has changed */

			ufield = uvect->fields + n_changed;

2714 2715 2716 2717
			buf = (byte*)
                          innobase_convert_and_store_changed_col(ufield,
					  (mysql_byte*)buf,
					  (mysql_byte*)n_ptr, n_len, col_type,
2718
						is_unsigned);
2719
			ufield->exp = NULL;
2720 2721
			ufield->field_no =
					(prebuilt->table->cols + i)->clust_pos;
2722 2723 2724 2725 2726 2727 2728
			n_changed++;
		}
	}

	uvect->n_fields = n_changed;
	uvect->info_bits = 0;

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2729 2730
	ut_a(buf <= (byte*)original_upd_buff + buff_len);

2731 2732 2733 2734 2735 2736 2737
	return(0);
}

/**************************************************************************
Updates a row given as a parameter to a new value. Note that we are given
whole rows, not just the fields which are updated: this incurs some
overhead for CPU when we check which fields are actually updated.
2738
TODO: currently InnoDB does not prevent the 'Halloween problem':
2739 2740
in a searched update a single row can get updated several times
if its index columns are updated! */
2741

2742 2743 2744 2745
int
ha_innobase::update_row(
/*====================*/
					/* out: error number or 0 */
2746 2747
	const mysql_byte* 	old_row,/* in: old row in MySQL format */
	mysql_byte* 		new_row)/* in: new row in MySQL format */
2748 2749 2750 2751 2752
{
	row_prebuilt_t*	prebuilt = (row_prebuilt_t*) innobase_prebuilt;
	upd_t*		uvect;
	int		error = 0;

2753
	DBUG_ENTER("ha_innobase::update_row");
2754

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2755 2756
	ut_ad(prebuilt->trx ==
		(trx_t*) current_thd->transaction.all.innobase_tid);
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2757

2758 2759
        if (table->timestamp_field_type & TIMESTAMP_AUTO_SET_ON_UPDATE)
                table->timestamp_field->set_time();
2760

2761 2762 2763
	if (last_query_id != user_thd->query_id) {
	        prebuilt->sql_stat_start = TRUE;
                last_query_id = user_thd->query_id;
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2764 2765

		innobase_release_stat_resources(prebuilt->trx);
2766 2767
	}

2768 2769 2770 2771 2772
	if (prebuilt->upd_node) {
		uvect = prebuilt->upd_node->update;
	} else {
		uvect = row_get_prebuilt_update_vector(prebuilt);
	}
2773 2774 2775 2776

	/* Build an update vector from the modified fields in the rows
	(uses upd_buff of the handle) */

2777
	calc_row_difference(uvect, (mysql_byte*) old_row, new_row, table,
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2778 2779 2780
			upd_buff, (ulint)upd_and_key_val_buff_len,
			prebuilt, user_thd);

2781 2782 2783
	/* This is not a delete */
	prebuilt->upd_node->is_delete = FALSE;

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2784
	assert(prebuilt->template_type == ROW_MYSQL_WHOLE_ROW);
2785

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2786
	innodb_srv_conc_enter_innodb(prebuilt->trx);
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Merge  
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2787

2788
	error = row_update_for_mysql((byte*) old_row, prebuilt);
2789

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heikki@hundin.mysql.fi committed
2790
	innodb_srv_conc_exit_innodb(prebuilt->trx);
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Merge  
monty@donna.mysql.fi committed
2791

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2792
	error = convert_error_code_to_mysql(error, user_thd);
2793

2794
	/* Tell InnoDB server that there might be work for
2795 2796
	utility threads: */

2797
	innobase_active_small();
2798 2799 2800 2801 2802 2803 2804 2805 2806 2807

	DBUG_RETURN(error);
}

/**************************************************************************
Deletes a row given as the parameter. */

int
ha_innobase::delete_row(
/*====================*/
2808 2809
					/* out: error number or 0 */
	const mysql_byte* record)	/* in: a row in MySQL format */
2810 2811 2812 2813
{
	row_prebuilt_t*	prebuilt = (row_prebuilt_t*) innobase_prebuilt;
	int		error = 0;

2814
	DBUG_ENTER("ha_innobase::delete_row");
2815

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2816 2817
	ut_ad(prebuilt->trx ==
		(trx_t*) current_thd->transaction.all.innobase_tid);
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2818

2819 2820 2821
	if (last_query_id != user_thd->query_id) {
	        prebuilt->sql_stat_start = TRUE;
                last_query_id = user_thd->query_id;
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2822 2823

		innobase_release_stat_resources(prebuilt->trx);
2824 2825
	}

2826 2827 2828
	if (!prebuilt->upd_node) {
		row_get_prebuilt_update_vector(prebuilt);
	}
2829 2830

	/* This is a delete */
2831

2832
	prebuilt->upd_node->is_delete = TRUE;
2833

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2834
	innodb_srv_conc_enter_innodb(prebuilt->trx);
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Merge  
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2835

2836
	error = row_update_for_mysql((byte*) record, prebuilt);
2837

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2838
	innodb_srv_conc_exit_innodb(prebuilt->trx);
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Merge  
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2839

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2840
	error = convert_error_code_to_mysql(error, user_thd);
2841

2842
	/* Tell the InnoDB server that there might be work for
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	utility threads: */

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	innobase_active_small();
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	DBUG_RETURN(error);
}

/**********************************************************************
Initializes a handle to use an index. */

int
ha_innobase::index_init(
/*====================*/
			/* out: 0 or error number */
	uint 	keynr)	/* in: key (index) number */
{
	int 	error	= 0;
  	DBUG_ENTER("index_init");

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	error = change_active_index(keynr);
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  	DBUG_RETURN(error);
}

/**********************************************************************
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Currently does nothing. */
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int
ha_innobase::index_end(void)
/*========================*/
{
	int 	error	= 0;
  	DBUG_ENTER("index_end");
2876
        active_index=MAX_KEY;
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  	DBUG_RETURN(error);
}

/*************************************************************************
Converts a search mode flag understood by MySQL to a flag understood
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by InnoDB. */
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inline
ulint
convert_search_mode_to_innobase(
/*============================*/
	enum ha_rkey_function	find_flag)
{
	switch (find_flag) {
  		case HA_READ_KEY_EXACT:		return(PAGE_CUR_GE);
  			/* the above does not require the index to be UNIQUE */
  		case HA_READ_KEY_OR_NEXT:	return(PAGE_CUR_GE);
		case HA_READ_KEY_OR_PREV:	return(PAGE_CUR_LE);
		case HA_READ_AFTER_KEY:		return(PAGE_CUR_G);
		case HA_READ_BEFORE_KEY:	return(PAGE_CUR_L);
		case HA_READ_PREFIX:		return(PAGE_CUR_GE);
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	        case HA_READ_PREFIX_LAST:       return(PAGE_CUR_LE);
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                case HA_READ_PREFIX_LAST_OR_PREV:return(PAGE_CUR_LE);
		  /* In MySQL-4.0 HA_READ_PREFIX and HA_READ_PREFIX_LAST always
		  pass a complete-field prefix of a key value as the search
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		  tuple. I.e., it is not allowed that the last field would
		  just contain n first bytes of the full field value.
		  MySQL uses a 'padding' trick to convert LIKE 'abc%'
		  type queries so that it can use as a search tuple
		  a complete-field-prefix of a key value. Thus, the InnoDB
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		  search mode PAGE_CUR_LE_OR_EXTENDS is never used.
		  TODO: when/if MySQL starts to use also partial-field
		  prefixes, we have to deal with stripping of spaces
		  and comparison of non-latin1 char type fields in
		  innobase_mysql_cmp() to get PAGE_CUR_LE_OR_EXTENDS to
		  work correctly. */

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		default:			assert(0);
	}

	return(0);
}
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/*
   BACKGROUND INFO: HOW A SELECT SQL QUERY IS EXECUTED
   ---------------------------------------------------
The following does not cover all the details, but explains how we determine
the start of a new SQL statement, and what is associated with it.

For each table in the database the MySQL interpreter may have several
table handle instances in use, also in a single SQL query. For each table
handle instance there is an InnoDB  'prebuilt' struct which contains most
of the InnoDB data associated with this table handle instance.

  A) if the user has not explicitly set any MySQL table level locks:

  1) MySQL calls ::external_lock to set an 'intention' table level lock on
the table of the handle instance. There we set
prebuilt->sql_stat_start = TRUE. The flag sql_stat_start should be set
true if we are taking this table handle instance to use in a new SQL
statement issued by the user. We also increment trx->n_mysql_tables_in_use.

  2) If prebuilt->sql_stat_start == TRUE we 'pre-compile' the MySQL search
instructions to prebuilt->template of the table handle instance in
::index_read. The template is used to save CPU time in large joins.

  3) In row_search_for_mysql, if prebuilt->sql_stat_start is true, we
allocate a new consistent read view for the trx if it does not yet have one,
or in the case of a locking read, set an InnoDB 'intention' table level
lock on the table.

  4) We do the SELECT. MySQL may repeatedly call ::index_read for the
same table handle instance, if it is a join.

  5) When the SELECT ends, MySQL removes its intention table level locks
in ::external_lock. When trx->n_mysql_tables_in_use drops to zero,
 (a) we execute a COMMIT there if the autocommit is on,
 (b) we also release possible 'SQL statement level resources' InnoDB may
have for this SQL statement. The MySQL interpreter does NOT execute
autocommit for pure read transactions, though it should. That is why the
table handler in that case has to execute the COMMIT in ::external_lock.

  B) If the user has explicitly set MySQL table level locks, then MySQL
does NOT call ::external_lock at the start of the statement. To determine
when we are at the start of a new SQL statement we at the start of
::index_read also compare the query id to the latest query id where the
table handle instance was used. If it has changed, we know we are at the
start of a new SQL statement. Since the query id can theoretically
overwrap, we use this test only as a secondary way of determining the
start of a new SQL statement. */


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/**************************************************************************
Positions an index cursor to the index specified in the handle. Fetches the
row if any. */

int
ha_innobase::index_read(
/*====================*/
					/* out: 0, HA_ERR_KEY_NOT_FOUND,
					or error number */
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	mysql_byte*		buf,	/* in/out: buffer for the returned
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					row */
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	const mysql_byte* 	key_ptr,/* in: key value; if this is NULL
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					we position the cursor at the
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					start or end of index; this can
					also contain an InnoDB row id, in
					which case key_len is the InnoDB
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					row id length; the key value can
					also be a prefix of a full key value,
					and the last column can be a prefix
					of a full column */
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	uint			key_len,/* in: key value length */
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	enum ha_rkey_function find_flag)/* in: search flags from my_base.h */
{
	row_prebuilt_t* prebuilt	= (row_prebuilt_t*) innobase_prebuilt;
	ulint		mode;
	dict_index_t*	index;
	ulint		match_mode 	= 0;
	int 		error;
	ulint		ret;

  	DBUG_ENTER("index_read");
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	ut_ad(prebuilt->trx ==
		(trx_t*) current_thd->transaction.all.innobase_tid);
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  	statistic_increment(ha_read_key_count, &LOCK_status);
3004

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	if (last_query_id != user_thd->query_id) {
	        prebuilt->sql_stat_start = TRUE;
                last_query_id = user_thd->query_id;
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		innobase_release_stat_resources(prebuilt->trx);
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	}

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	index = prebuilt->index;
3013

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	/* Note that if the index for which the search template is built is not
        necessarily prebuilt->index, but can also be the clustered index */
3016

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	if (prebuilt->sql_stat_start) {
		build_template(prebuilt, user_thd, table,
							ROW_MYSQL_REC_FIELDS);
	}
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	if (key_ptr) {
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	        /* Convert the search key value to InnoDB format into
		prebuilt->search_tuple */

3026
		row_sel_convert_mysql_key_to_innobase(prebuilt->search_tuple,
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					(byte*) key_val_buff,
					(ulint)upd_and_key_val_buff_len,
					index,
					(byte*) key_ptr,
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					(ulint) key_len, prebuilt->trx);
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	} else {
		/* We position the cursor to the last or the first entry
		in the index */

 		dtuple_set_n_fields(prebuilt->search_tuple, 0);
	}
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	mode = convert_search_mode_to_innobase(find_flag);

	match_mode = 0;

	if (find_flag == HA_READ_KEY_EXACT) {
		match_mode = ROW_SEL_EXACT;

	} else if (find_flag == HA_READ_PREFIX
				|| find_flag == HA_READ_PREFIX_LAST) {
		match_mode = ROW_SEL_EXACT_PREFIX;
	}

	last_match_mode = match_mode;

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	innodb_srv_conc_enter_innodb(prebuilt->trx);
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	ret = row_search_for_mysql((byte*) buf, mode, prebuilt, match_mode, 0);
3056

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	innodb_srv_conc_exit_innodb(prebuilt->trx);
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	if (ret == DB_SUCCESS) {
		error = 0;
		table->status = 0;

	} else if (ret == DB_RECORD_NOT_FOUND) {
		error = HA_ERR_KEY_NOT_FOUND;
		table->status = STATUS_NOT_FOUND;

	} else if (ret == DB_END_OF_INDEX) {
		error = HA_ERR_KEY_NOT_FOUND;
		table->status = STATUS_NOT_FOUND;
	} else {
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		error = convert_error_code_to_mysql(ret, user_thd);
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		table->status = STATUS_NOT_FOUND;
	}
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	DBUG_RETURN(error);
}

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/***********************************************************************
The following functions works like index_read, but it find the last
row with the current key value or prefix. */
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int
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ha_innobase::index_read_last(
/*=========================*/
			           /* out: 0, HA_ERR_KEY_NOT_FOUND, or an
				   error code */
        mysql_byte*       buf,     /* out: fetched row */
        const mysql_byte* key_ptr, /* in: key value, or a prefix of a full
				   key value */
	uint              key_len) /* in: length of the key val or prefix
				   in bytes */
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{
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        return(index_read(buf, key_ptr, key_len, HA_READ_PREFIX_LAST));
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}

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/************************************************************************
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Changes the active index of a handle. */
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int
ha_innobase::change_active_index(
/*=============================*/
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			/* out: 0 or error code */
	uint 	keynr)	/* in: use this index; MAX_KEY means always clustered
			index, even if it was internally generated by
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			InnoDB */
3106
{
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	row_prebuilt_t* prebuilt	= (row_prebuilt_t*) innobase_prebuilt;
	KEY*		key=0;
	statistic_increment(ha_read_key_count, &LOCK_status);
	DBUG_ENTER("change_active_index");
3111

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	ut_ad(user_thd == current_thd);
	ut_ad(prebuilt->trx ==
	     (trx_t*) current_thd->transaction.all.innobase_tid);
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	active_index = keynr;
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	if (keynr != MAX_KEY && table->keys > 0) {
		key = table->key_info + active_index;
3120

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		prebuilt->index = dict_table_get_index_noninline(
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						     prebuilt->table,
						     key->name);
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        } else {
		prebuilt->index = dict_table_get_first_index_noninline(
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							   prebuilt->table);
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	}
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	if (!prebuilt->index) {
	       sql_print_error(
"Innodb could not find key n:o %u with name %s from dict cache for table %s",
	      keynr, key ? key->name : "NULL", prebuilt->table->name);
	      DBUG_RETURN(1);
	}
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	assert(prebuilt->search_tuple != 0);
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	dtuple_set_n_fields(prebuilt->search_tuple, prebuilt->index->n_fields);
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	dict_index_copy_types(prebuilt->search_tuple, prebuilt->index,
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			prebuilt->index->n_fields);
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	/* MySQL changes the active index for a handle also during some
	queries, for example SELECT MAX(a), SUM(a) first retrieves the MAX()
	and then calculates the sum. Previously we played safe and used
	the flag ROW_MYSQL_WHOLE_ROW below, but that caused unnecessary
	copying. Starting from MySQL-4.1 we use a more efficient flag here. */
3148

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	build_template(prebuilt, user_thd, table, ROW_MYSQL_REC_FIELDS);
3150

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	DBUG_RETURN(0);
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}

/**************************************************************************
Positions an index cursor to the index specified in keynr. Fetches the
row if any. */
/* ??? This is only used to read whole keys ??? */

int
ha_innobase::index_read_idx(
/*========================*/
					/* out: error number or 0 */
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	mysql_byte*	buf,		/* in/out: buffer for the returned
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					row */
	uint 		keynr,		/* in: use this index */
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	const mysql_byte* key,		/* in: key value; if this is NULL
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					we position the cursor at the
					start or end of index */
	uint		key_len,	/* in: key value length */
	enum ha_rkey_function find_flag)/* in: search flags from my_base.h */
{
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	if (change_active_index(keynr)) {

		return(1);
	}
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	return(index_read(buf, key, key_len, find_flag));
}

/***************************************************************************
Reads the next or previous row from a cursor, which must have previously been
positioned using index_read. */

int
ha_innobase::general_fetch(
/*=======================*/
				/* out: 0, HA_ERR_END_OF_FILE, or error
				number */
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	mysql_byte* 	buf,	/* in/out: buffer for next row in MySQL
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				format */
	uint 	direction,	/* in: ROW_SEL_NEXT or ROW_SEL_PREV */
	uint	match_mode)	/* in: 0, ROW_SEL_EXACT, or
				ROW_SEL_EXACT_PREFIX */
{
	row_prebuilt_t*	prebuilt = (row_prebuilt_t*) innobase_prebuilt;
	ulint		ret;
	int		error	= 0;
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3199
	DBUG_ENTER("general_fetch");
3200

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	ut_ad(prebuilt->trx ==
	     (trx_t*) current_thd->transaction.all.innobase_tid);
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	innodb_srv_conc_enter_innodb(prebuilt->trx);
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	ret = row_search_for_mysql((byte*)buf, 0, prebuilt, match_mode,
								direction);
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	innodb_srv_conc_exit_innodb(prebuilt->trx);
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	if (ret == DB_SUCCESS) {
		error = 0;
		table->status = 0;

	} else if (ret == DB_RECORD_NOT_FOUND) {
		error = HA_ERR_END_OF_FILE;
		table->status = STATUS_NOT_FOUND;

	} else if (ret == DB_END_OF_INDEX) {
		error = HA_ERR_END_OF_FILE;
		table->status = STATUS_NOT_FOUND;
	} else {
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		error = convert_error_code_to_mysql(ret, user_thd);
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		table->status = STATUS_NOT_FOUND;
	}
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	DBUG_RETURN(error);
}

/***************************************************************************
Reads the next row from a cursor, which must have previously been
positioned using index_read. */

int
ha_innobase::index_next(
/*====================*/
				/* out: 0, HA_ERR_END_OF_FILE, or error
				number */
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	mysql_byte* 	buf)	/* in/out: buffer for next row in MySQL
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				format */
{
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  	statistic_increment(ha_read_next_count, &LOCK_status);

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	return(general_fetch(buf, ROW_SEL_NEXT, 0));
}

/***********************************************************************
Reads the next row matching to the key value given as the parameter. */

int
ha_innobase::index_next_same(
/*=========================*/
				/* out: 0, HA_ERR_END_OF_FILE, or error
				number */
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	mysql_byte* 	buf,	/* in/out: buffer for the row */
	const mysql_byte* key,	/* in: key value */
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	uint 		keylen)	/* in: key value length */
{
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  	statistic_increment(ha_read_next_count, &LOCK_status);
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	return(general_fetch(buf, ROW_SEL_NEXT, last_match_mode));
}

/***************************************************************************
Reads the previous row from a cursor, which must have previously been
positioned using index_read. */

int
ha_innobase::index_prev(
/*====================*/
				/* out: 0, HA_ERR_END_OF_FILE, or error
				number */
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	mysql_byte* 	buf)	/* in/out: buffer for previous row in MySQL
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				format */
{
	return(general_fetch(buf, ROW_SEL_PREV, 0));
}

/************************************************************************
Positions a cursor on the first record in an index and reads the
corresponding row to buf. */

int
ha_innobase::index_first(
/*=====================*/
3285
				/* out: 0, HA_ERR_END_OF_FILE,
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				or error code */
	mysql_byte*	buf)	/* in/out: buffer for the row */
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{
	int	error;

  	DBUG_ENTER("index_first");
  	statistic_increment(ha_read_first_count, &LOCK_status);

  	error = index_read(buf, NULL, 0, HA_READ_AFTER_KEY);

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        /* MySQL does not seem to allow this to return HA_ERR_KEY_NOT_FOUND */

  	if (error == HA_ERR_KEY_NOT_FOUND) {
  		error = HA_ERR_END_OF_FILE;
  	}

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  	DBUG_RETURN(error);
}

/************************************************************************
Positions a cursor on the last record in an index and reads the
corresponding row to buf. */

int
ha_innobase::index_last(
/*====================*/
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				/* out: 0, HA_ERR_END_OF_FILE, or error code */
	mysql_byte*	buf)	/* in/out: buffer for the row */
3314 3315 3316
{
	int	error;

3317
  	DBUG_ENTER("index_last");
3318
  	statistic_increment(ha_read_last_count, &LOCK_status);
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  	error = index_read(buf, NULL, 0, HA_READ_BEFORE_KEY);

3322
        /* MySQL does not seem to allow this to return HA_ERR_KEY_NOT_FOUND */
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  	if (error == HA_ERR_KEY_NOT_FOUND) {
  		error = HA_ERR_END_OF_FILE;
  	}

  	DBUG_RETURN(error);
}

/********************************************************************
Initialize a table scan. */

int
ha_innobase::rnd_init(
/*==================*/
			/* out: 0 or error number */
3338
	bool	scan)	/* in: ???????? */
3339
{
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	int	err;
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	row_prebuilt_t*	prebuilt = (row_prebuilt_t*) innobase_prebuilt;
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	/* Store the active index value so that we can restore the original
	value after a scan */

3347
	if (prebuilt->clust_index_was_generated) {
monty@donna.mysql.fi's avatar
Merge  
monty@donna.mysql.fi committed
3348
		err = change_active_index(MAX_KEY);
3349
	} else {
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Merge  
monty@donna.mysql.fi committed
3350
		err = change_active_index(primary_key);
3351
	}
3352

3353
  	start_of_scan = 1;
3354

monty@donna.mysql.fi's avatar
Merge  
monty@donna.mysql.fi committed
3355
 	return(err);
3356 3357 3358
}

/*********************************************************************
3359
Ends a table scan. */
3360 3361 3362 3363 3364 3365

int
ha_innobase::rnd_end(void)
/*======================*/
				/* out: 0 or error number */
{
3366
	return(index_end());
3367 3368 3369 3370 3371 3372 3373 3374 3375 3376
}

/*********************************************************************
Reads the next row in a table scan (also used to read the FIRST row
in a table scan). */

int
ha_innobase::rnd_next(
/*==================*/
			/* out: 0, HA_ERR_END_OF_FILE, or error number */
3377
	mysql_byte* buf)/* in/out: returns the row in this buffer,
3378 3379
			in MySQL format */
{
3380
	int	error;
3381 3382 3383 3384

  	DBUG_ENTER("rnd_next");
  	statistic_increment(ha_read_rnd_next_count, &LOCK_status);

3385
  	if (start_of_scan) {
3386 3387 3388 3389
		error = index_first(buf);
		if (error == HA_ERR_KEY_NOT_FOUND) {
			error = HA_ERR_END_OF_FILE;
		}
3390
		start_of_scan = 0;
3391
	} else {
3392
		error = general_fetch(buf, ROW_SEL_NEXT, 0);
3393
	}
3394

3395 3396 3397 3398
  	DBUG_RETURN(error);
}

/**************************************************************************
3399
Fetches a row from the table based on a row reference. */
3400

3401 3402 3403
int
ha_innobase::rnd_pos(
/*=================*/
3404 3405 3406
				/* out: 0, HA_ERR_KEY_NOT_FOUND,
				or error code */
	mysql_byte* 	buf,	/* in/out: buffer for the row */
3407 3408 3409 3410 3411
	mysql_byte*	pos)	/* in: primary key value of the row in the
				MySQL format, or the row id if the clustered
				index was internally generated by InnoDB;
				the length of data in pos has to be
				ref_length */
3412
{
3413 3414 3415
	row_prebuilt_t*	prebuilt = (row_prebuilt_t*) innobase_prebuilt;
	int		error;
	uint		keynr	= active_index;
3416
	DBUG_ENTER("rnd_pos");
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3417
	DBUG_DUMP("key", (char*) pos, ref_length);
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monty@hundin.mysql.fi committed
3418

3419
	statistic_increment(ha_read_rnd_count, &LOCK_status);
3420

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heikki@hundin.mysql.fi committed
3421 3422
	ut_ad(prebuilt->trx ==
		(trx_t*) current_thd->transaction.all.innobase_tid);
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3423

3424 3425 3426 3427
	if (prebuilt->clust_index_was_generated) {
		/* No primary key was defined for the table and we
		generated the clustered index from the row id: the
		row reference is the row id, not any key value
3428
		that MySQL knows of */
3429

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Merge  
monty@donna.mysql.fi committed
3430
		error = change_active_index(MAX_KEY);
3431
	} else {
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Merge  
monty@donna.mysql.fi committed
3432
		error = change_active_index(primary_key);
3433
	}
3434

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Merge  
monty@donna.mysql.fi committed
3435
	if (error) {
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monty@hundin.mysql.fi committed
3436
	        DBUG_PRINT("error",("Got error: %ld",error));
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Merge  
monty@donna.mysql.fi committed
3437 3438
		DBUG_RETURN(error);
	}
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3439

3440 3441 3442 3443
	/* Note that we assume the length of the row reference is fixed
        for the table, and it is == ref_length */

	error = index_read(buf, pos, ref_length, HA_READ_KEY_EXACT);
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3444 3445 3446 3447
	if (error)
	{
	  DBUG_PRINT("error",("Got error: %ld",error));
	}
3448
	change_active_index(keynr);
3449

3450 3451 3452 3453
  	DBUG_RETURN(error);
}

/*************************************************************************
3454
Stores a reference to the current row to 'ref' field of the handle. Note
3455 3456
that in the case where we have generated the clustered index for the
table, the function parameter is illogical: we MUST ASSUME that 'record'
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heikki@hundin.mysql.fi committed
3457
is the current 'position' of the handle, because if row ref is actually
3458
the row id internally generated in InnoDB, then 'record' does not contain
3459 3460
it. We just guess that the row id must be for the record where the handle
was positioned the last time. */
3461 3462 3463 3464

void
ha_innobase::position(
/*==================*/
3465
	const mysql_byte*	record)	/* in: row in MySQL format */
3466
{
3467 3468
	row_prebuilt_t*	prebuilt = (row_prebuilt_t*) innobase_prebuilt;
	uint		len;
3469

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3470 3471
	ut_ad(prebuilt->trx ==
		(trx_t*) current_thd->transaction.all.innobase_tid);
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3472

3473 3474 3475 3476
	if (prebuilt->clust_index_was_generated) {
		/* No primary key was defined for the table and we
		generated the clustered index from row id: the
		row reference will be the row id, not any key value
3477
		that MySQL knows of */
3478 3479 3480 3481 3482

		len = DATA_ROW_ID_LEN;

		memcpy(ref, prebuilt->row_id, len);
	} else {
3483 3484
		len = store_key_val_for_row(primary_key, (char*)ref,
							 ref_length, record);
3485
	}
3486

3487 3488 3489
	/* Since we do not store len to the buffer 'ref', we must assume
	that len is always fixed for this table. The following assertion
	checks this. */
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3490
  
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3491 3492 3493
	if (len != ref_length) {
	        fprintf(stderr,
	 "InnoDB: Error: stored ref len is %lu, but table ref len is %lu\n",
3494
		  (ulong)len, (ulong)ref_length);
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3495
	}
3496 3497 3498
}

/*********************************************************************
3499
Creates a table definition to an InnoDB database. */
3500 3501 3502 3503
static
int
create_table_def(
/*=============*/
3504
	trx_t*		trx,		/* in: InnoDB transaction handle */
3505 3506
	TABLE*		form,		/* in: information on table
					columns and indexes */
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3507 3508 3509 3510 3511 3512 3513 3514 3515
	const char*	table_name,	/* in: table name */
	const char*	path_of_temp_table)/* in: if this is a table explicitly
					created by the user with the
					TEMPORARY keyword, then this
					parameter is the dir path where the
					table should be placed if we create
					an .ibd file for it (no .ibd extension
					in the path, though); otherwise this
					is NULL */
3516 3517 3518 3519 3520 3521
{
	Field*		field;
	dict_table_t*	table;
	ulint		n_cols;
  	int 		error;
  	ulint		col_type;
3522 3523
  	ulint		nulls_allowed;
	ulint		unsigned_type;
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3524
	ulint		binary_type;
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heikki@hundin.mysql.fi committed
3525
	ulint		charset_no;
3526
  	ulint		i;
3527

3528 3529 3530 3531 3532
  	DBUG_ENTER("create_table_def");
  	DBUG_PRINT("enter", ("table_name: %s", table_name));

	n_cols = form->fields;

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heikki@hundin.mysql.fi committed
3533 3534
	/* We pass 0 as the space id, and determine at a lower level the space
	id where to store the table */
3535 3536

	table = dict_mem_table_create((char*) table_name, 0, n_cols);
3537

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heikki@hundin.mysql.fi committed
3538 3539 3540 3541 3542
	if (path_of_temp_table) {
		table->dir_path_of_temp_table =
			mem_heap_strdup(table->heap, path_of_temp_table);
	}

3543 3544 3545
	for (i = 0; i < n_cols; i++) {
		field = form->field[i];

3546 3547 3548 3549 3550 3551 3552 3553 3554 3555 3556 3557
		col_type = get_innobase_type_from_mysql_type(field);
		if (field->null_ptr) {
			nulls_allowed = 0;
		} else {
			nulls_allowed = DATA_NOT_NULL;
		}

		if (field->flags & UNSIGNED_FLAG) {
			unsigned_type = DATA_UNSIGNED;
		} else {
			unsigned_type = 0;
		}
3558

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heikki@hundin.mysql.fi committed
3559
		if (field->binary()) {
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3560 3561 3562 3563 3564
			binary_type = DATA_BINARY_TYPE;
		} else {
			binary_type = 0;
		}

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3565 3566 3567 3568 3569 3570 3571 3572 3573 3574
		charset_no = 0;	

		if (dtype_is_string_type(col_type)) {

			charset_no = (ulint)field->charset()->number;

			ut_a(charset_no < 256); /* in ut0type.h we assume that
						the number fits in one byte */
		}

3575
		dict_mem_table_add_col(table, (char*) field->field_name,
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3576 3577
					col_type, dtype_form_prtype( 
					(ulint)field->type()
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3578
					| nulls_allowed | unsigned_type
3579
					| binary_type,
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3580
					+ charset_no),
3581 3582 3583 3584 3585
					field->pack_length(), 0);
	}

	error = row_create_table_for_mysql(table, trx);

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3586
	error = convert_error_code_to_mysql(error, NULL);
3587 3588 3589 3590 3591

	DBUG_RETURN(error);
}

/*********************************************************************
3592
Creates an index in an InnoDB database. */
3593 3594
static
int
3595 3596
create_index(
/*=========*/
3597
	trx_t*		trx,		/* in: InnoDB transaction handle */
3598 3599 3600 3601 3602
	TABLE*		form,		/* in: information on table
					columns and indexes */
	const char*	table_name,	/* in: table name */
	uint		key_num)	/* in: index number */
{
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3603
	Field*		field;
3604
	dict_index_t*	index;
3605
  	int 		error;
3606 3607 3608 3609
	ulint		n_fields;
	KEY*		key;
	KEY_PART_INFO*	key_part;
	ulint		ind_type;
3610 3611
	ulint		col_type;
	ulint		prefix_len;
3612
  	ulint		i;
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heikki@hundin.mysql.fi committed
3613
  	ulint		j;
3614

3615
  	DBUG_ENTER("create_index");
3616

3617 3618 3619
	key = form->key_info + key_num;

    	n_fields = key->key_parts;
3620

3621 3622
    	ind_type = 0;

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heikki@hundin.mysql.fi committed
3623
    	if (key_num == form->primary_key) {
3624 3625
		ind_type = ind_type | DICT_CLUSTERED;
	}
3626

3627 3628 3629 3630
	if (key->flags & HA_NOSAME ) {
		ind_type = ind_type | DICT_UNIQUE;
	}

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3631 3632
	/* We pass 0 as the space id, and determine at a lower level the space
	id where to store the table */
3633 3634 3635 3636 3637 3638

	index = dict_mem_index_create((char*) table_name, key->name, 0,
						ind_type, n_fields);
	for (i = 0; i < n_fields; i++) {
		key_part = key->key_part + i;

3639
		/* (The flag HA_PART_KEY_SEG denotes in MySQL a column prefix
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3640 3641 3642 3643 3644 3645 3646 3647 3648 3649
		field in an index: we only store a specified number of first
		bytes of the column to the index field.) The flag does not
		seem to be properly set by MySQL. Let us fall back on testing
		the length of the key part versus the column. */
		
		field = NULL;
		for (j = 0; j < form->fields; j++) {

			field = form->field[j];

3650 3651 3652
			if (0 == innobase_strcasecmp(
					field->field_name,
					key_part->field->field_name)) {
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3653 3654 3655 3656 3657 3658 3659 3660 3661 3662 3663 3664 3665
				/* Found the corresponding column */

				break;
			}
		}

		ut_a(j < form->fields);

		col_type = get_innobase_type_from_mysql_type(key_part->field);

		if (DATA_BLOB == col_type
		    || key_part->length < field->pack_length()) {

3666 3667 3668 3669 3670 3671 3672 3673
		        prefix_len = key_part->length;

			if (col_type == DATA_INT
			    || col_type == DATA_FLOAT
			    || col_type == DATA_DOUBLE
			    || col_type == DATA_DECIMAL) {
			        fprintf(stderr,
"InnoDB: error: MySQL is trying to create a column prefix index field\n"
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3674 3675
"InnoDB: on an inappropriate data type. Table name %s, column name %s.\n",
				  table_name, key_part->field->field_name);
3676 3677 3678 3679 3680
			        
			        prefix_len = 0;
			}
		} else {
		        prefix_len = 0;
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3681 3682
		}

3683 3684
		/* We assume all fields should be sorted in ascending
		order, hence the '0': */
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3685

3686
		dict_mem_index_add_field(index,
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3687 3688
				(char*) key_part->field->field_name,
				0, prefix_len);
3689 3690 3691 3692
	}

	error = row_create_index_for_mysql(index, trx);

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3693
	error = convert_error_code_to_mysql(error, NULL);
3694 3695 3696 3697 3698

	DBUG_RETURN(error);
}

/*********************************************************************
3699
Creates an index to an InnoDB table when the user has defined no
3700
primary index. */
3701 3702
static
int
3703 3704
create_clustered_index_when_no_primary(
/*===================================*/
3705
	trx_t*		trx,		/* in: InnoDB transaction handle */
3706 3707 3708
	const char*	table_name)	/* in: table name */
{
	dict_index_t*	index;
3709 3710
  	int 		error;

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3711 3712
	/* We pass 0 as the space id, and determine at a lower level the space
	id where to store the table */
3713

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3714 3715 3716
	index = dict_mem_index_create((char*) table_name,
				      (char*) "GEN_CLUST_INDEX",
				      0, DICT_CLUSTERED, 0);
3717 3718
	error = row_create_index_for_mysql(index, trx);

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3719
	error = convert_error_code_to_mysql(error, NULL);
3720

3721
	return(error);
3722 3723 3724
}

/*********************************************************************
3725
Creates a new table to an InnoDB database. */
3726 3727 3728 3729 3730 3731 3732 3733

int
ha_innobase::create(
/*================*/
					/* out: error number */
	const char*	name,		/* in: table name */
	TABLE*		form,		/* in: information on table
					columns and indexes */
3734 3735 3736
	HA_CREATE_INFO*	create_info)	/* in: more information of the
					created table, contains also the
					create statement string */
3737 3738 3739
{
	int		error;
	dict_table_t*	innobase_table;
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3740
	trx_t*		parent_trx;
3741
	trx_t*		trx;
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3742
	int		primary_key_no;
3743
	uint		i;
3744 3745
	char		name2[FN_REFLEN];
	char		norm_name[FN_REFLEN];
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3746
	THD		*thd= current_thd;
3747

3748 3749
  	DBUG_ENTER("ha_innobase::create");

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3750
	DBUG_ASSERT(thd != NULL);
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3751

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3752 3753 3754 3755
	if (form->fields > 1000) {
		/* The limit probably should be REC_MAX_N_FIELDS - 3 = 1020,
		but we play safe here */

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3756
	        DBUG_RETURN(HA_ERR_TO_BIG_ROW);
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3757 3758
	} 

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	/* Get the transaction associated with the current thd, or create one
	if not yet created */
	
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3762
	parent_trx = check_trx_exists(current_thd);
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	/* In case MySQL calls this in the middle of a SELECT query, release
	possible adaptive hash latch to avoid deadlocks of threads */

	trx_search_latch_release_if_reserved(parent_trx);	
	
3769
	trx = trx_allocate_for_mysql();
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3770 3771 3772
		
	trx->mysql_thd = thd;
	trx->mysql_query_str = &((*thd).query);
3773

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3774
	if (thd->options & OPTION_NO_FOREIGN_KEY_CHECKS) {
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3775 3776 3777
		trx->check_foreigns = FALSE;
	}

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3778
	if (thd->options & OPTION_RELAXED_UNIQUE_CHECKS) {
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3779 3780 3781
		trx->check_unique_secondary = FALSE;
	}

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3782 3783 3784 3785 3786
	if (lower_case_table_names) {
		srv_lower_case_table_names = TRUE;
	} else {
		srv_lower_case_table_names = FALSE;
	}
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3788
	fn_format(name2, name, "", "", 2);	// Remove the .frm extension
3789 3790

	normalize_table_name(norm_name, name2);
3791

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3792
	/* Latch the InnoDB data dictionary exclusively so that no deadlocks
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3793
	or lock waits can happen in it during a table create operation.
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	Drop table etc. do this latching in row0mysql.c. */
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	row_mysql_lock_data_dictionary(trx);
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3797 3798

	/* Create the table definition in InnoDB */
3799

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	if (create_info->options & HA_LEX_CREATE_TMP_TABLE) {

  		error = create_table_def(trx, form, norm_name, name2);
	} else {
		error = create_table_def(trx, form, norm_name, NULL);
	}

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3807
  	if (error) {
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		innobase_commit_low(trx);
3809

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3810
		row_mysql_unlock_data_dictionary(trx);
3811 3812 3813 3814 3815 3816

  		trx_free_for_mysql(trx);

 		DBUG_RETURN(error);
 	}

3817 3818
	/* Look for a primary key */

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3819 3820 3821
	primary_key_no= (table->primary_key != MAX_KEY ?
			 (int) table->primary_key : 
			 -1);
3822

3823 3824 3825
	/* Our function row_get_mysql_key_number_for_index assumes
	the primary key is always number 0, if it exists */

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3826
	DBUG_ASSERT(primary_key_no == -1 || primary_key_no == 0);
3827

3828 3829
	/* Create the keys */

3830 3831 3832
	if (form->keys == 0 || primary_key_no == -1) {
		/* Create an index which is used as the clustered index;
		order the rows by their row id which is internally generated
3833
		by InnoDB */
3834

3835
		error = create_clustered_index_when_no_primary(trx,
3836
							norm_name);
3837
  		if (error) {
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3838 3839
			innobase_commit_low(trx);

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3840
			row_mysql_unlock_data_dictionary(trx);
3841

3842 3843 3844 3845
			trx_free_for_mysql(trx);

			DBUG_RETURN(error);
      		}
3846 3847 3848
	}

	if (primary_key_no != -1) {
3849
		/* In InnoDB the clustered index must always be created
3850
		first */
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3851 3852
	    	if ((error = create_index(trx, form, norm_name,
					  (uint) primary_key_no))) {
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3853 3854
			innobase_commit_low(trx);

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3855
			row_mysql_unlock_data_dictionary(trx);
3856 3857 3858 3859 3860 3861 3862 3863 3864 3865 3866

  			trx_free_for_mysql(trx);

			DBUG_RETURN(error);
      		}
      	}

	for (i = 0; i < form->keys; i++) {

		if (i != (uint) primary_key_no) {

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monty@donna.mysql.fi committed
3867
    			if ((error = create_index(trx, form, norm_name, i))) {
3868

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3869
			  	innobase_commit_low(trx);
3870

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3871
				row_mysql_unlock_data_dictionary(trx);
3872 3873 3874 3875 3876

  				trx_free_for_mysql(trx);

				DBUG_RETURN(error);
      			}
3877
      		}
3878
  	}
3879

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3880
	if (current_thd->query != NULL) {
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3881
		LEX_STRING q;
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3882

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		if (thd->convert_string(&q, system_charset_info,
					current_thd->query,
					current_thd->query_length,
					current_thd->charset())) {
			error = HA_ERR_OUT_OF_MEM;
		} else {
			error = row_table_add_foreign_constraints(trx,
					q.str, norm_name);

			error = convert_error_code_to_mysql(error, NULL);
		}
3894

3895 3896
		if (error) {
			innobase_commit_low(trx);
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3897

3898
			row_mysql_unlock_data_dictionary(trx);
3899

3900
  			trx_free_for_mysql(trx);
3901

3902 3903
			DBUG_RETURN(error);
		}
3904 3905
	}

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heikki@hundin.mysql.fi committed
3906 3907
  	innobase_commit_low(trx);

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3908
	row_mysql_unlock_data_dictionary(trx);
3909

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Merge  
monty@donna.mysql.fi committed
3910 3911 3912
	/* Flush the log to reduce probability that the .frm files and
	the InnoDB data dictionary get out-of-sync if the user runs
	with innodb_flush_log_at_trx_commit = 0 */
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3913

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3914
	log_buffer_flush_to_disk();
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Merge  
monty@donna.mysql.fi committed
3915

3916
	innobase_table = dict_table_get(norm_name, NULL);
3917

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3918
	DBUG_ASSERT(innobase_table != 0);
3919

3920
	/* Tell the InnoDB server that there might be work for
3921 3922 3923 3924 3925 3926 3927 3928 3929
	utility threads: */

	srv_active_wake_master_thread();

  	trx_free_for_mysql(trx);

	DBUG_RETURN(0);
}

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3930 3931 3932 3933 3934 3935 3936 3937 3938 3939
/*********************************************************************
Discards or imports an InnoDB tablespace. */

int
ha_innobase::discard_or_import_tablespace(
/*======================================*/
				/* out: 0 == success, -1 == error */
	my_bool discard)	/* in: TRUE if discard, else import */
{
	row_prebuilt_t* prebuilt	= (row_prebuilt_t*) innobase_prebuilt;
3940
	dict_table_t*	dict_table;
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	trx_t*		trx;
	int		err;

 	DBUG_ENTER("ha_innobase::discard_or_import_tablespace");

	ut_a(prebuilt->trx && prebuilt->trx->magic_n == TRX_MAGIC_N);
	ut_a(prebuilt->trx ==
		(trx_t*) current_thd->transaction.all.innobase_tid);

3950
	dict_table = prebuilt->table;
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3951 3952 3953
	trx = prebuilt->trx;

	if (discard) {
3954
		err = row_discard_tablespace_for_mysql(dict_table->name, trx);
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3955
	} else {
3956
		err = row_import_tablespace_for_mysql(dict_table->name, trx);
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3957 3958
	}

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3959
	err = convert_error_code_to_mysql(err, NULL);
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3960

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3961
	DBUG_RETURN(err);
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3962 3963
}

3964
/*********************************************************************
3965
Drops a table from an InnoDB database. Before calling this function,
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monty@donna.mysql.com committed
3966 3967
MySQL calls innobase_commit to commit the transaction of the current user.
Then the current user cannot have locks set on the table. Drop table
3968 3969
operation inside InnoDB will remove all locks any user has on the table
inside InnoDB. */
3970 3971 3972 3973

int
ha_innobase::delete_table(
/*======================*/
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3974 3975
				/* out: error number */
	const char*	name)	/* in: table name */
3976 3977 3978
{
	ulint	name_len;
	int	error;
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3979
	trx_t*	parent_trx;
3980
	trx_t*	trx;
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3981
	THD     *thd= current_thd;
3982
	char	norm_name[1000];
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3983

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3984
 	DBUG_ENTER("ha_innobase::delete_table");
3985

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3986 3987 3988
	/* Get the transaction associated with the current thd, or create one
	if not yet created */
	
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3989
	parent_trx = check_trx_exists(current_thd);
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3990 3991 3992 3993 3994 3995

	/* In case MySQL calls this in the middle of a SELECT query, release
	possible adaptive hash latch to avoid deadlocks of threads */

	trx_search_latch_release_if_reserved(parent_trx);	

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	if (lower_case_table_names) {
		srv_lower_case_table_names = TRUE;
	} else {
		srv_lower_case_table_names = FALSE;
	}

4002 4003
	trx = trx_allocate_for_mysql();

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4004 4005
	trx->mysql_thd = current_thd;
	trx->mysql_query_str = &((*current_thd).query);
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4007 4008 4009 4010 4011 4012 4013 4014
	if (thd->options & OPTION_NO_FOREIGN_KEY_CHECKS) {
		trx->check_foreigns = FALSE;
	}

	if (thd->options & OPTION_RELAXED_UNIQUE_CHECKS) {
		trx->check_unique_secondary = FALSE;
	}

4015 4016 4017
	name_len = strlen(name);

	assert(name_len < 1000);
4018

4019 4020
	/* Strangely, MySQL passes the table name without the '.frm'
	extension, in contrast to ::create */
4021

4022 4023
	normalize_table_name(norm_name, name);

4024
  	/* Drop the table in InnoDB */
4025

4026
	error = row_drop_table_for_mysql(norm_name, trx,
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monty@mishka.local committed
4027
		thd->lex->sql_command == SQLCOM_DROP_DB);
4028

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Merge  
monty@donna.mysql.fi committed
4029 4030 4031
	/* Flush the log to reduce probability that the .frm files and
	the InnoDB data dictionary get out-of-sync if the user runs
	with innodb_flush_log_at_trx_commit = 0 */
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4032

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heikki@hundin.mysql.fi committed
4033
	log_buffer_flush_to_disk();
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Merge  
monty@donna.mysql.fi committed
4034

4035
	/* Tell the InnoDB server that there might be work for
4036 4037 4038 4039
	utility threads: */

	srv_active_wake_master_thread();

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heikki@hundin.mysql.fi committed
4040
  	innobase_commit_low(trx);
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4041

4042 4043
  	trx_free_for_mysql(trx);

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4044
	error = convert_error_code_to_mysql(error, NULL);
4045 4046 4047 4048

	DBUG_RETURN(error);
}

4049 4050 4051 4052 4053 4054 4055 4056 4057 4058 4059 4060 4061
/*********************************************************************
Removes all tables in the named database inside InnoDB. */

int
innobase_drop_database(
/*===================*/
			/* out: error number */
	char*	path)	/* in: database path; inside InnoDB the name
			of the last directory in the path is used as
			the database name: for example, in 'mysql/data/test'
			the database name is 'test' */
{
	ulint	len		= 0;
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4062
	trx_t*	parent_trx;
4063 4064 4065
	trx_t*	trx;
	char*	ptr;
	int	error;
4066
	char*	namebuf;
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4067

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4068 4069 4070
	/* Get the transaction associated with the current thd, or create one
	if not yet created */
	
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4071
	parent_trx = check_trx_exists(current_thd);
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4072 4073 4074 4075 4076 4077

	/* In case MySQL calls this in the middle of a SELECT query, release
	possible adaptive hash latch to avoid deadlocks of threads */

	trx_search_latch_release_if_reserved(parent_trx);	

4078
	ptr = strend(path) - 2;
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4079

4080 4081 4082 4083 4084 4085
	while (ptr >= path && *ptr != '\\' && *ptr != '/') {
		ptr--;
		len++;
	}

	ptr++;
4086
	namebuf = my_malloc(len + 2, MYF(0));
4087 4088 4089 4090

	memcpy(namebuf, ptr, len);
	namebuf[len] = '/';
	namebuf[len + 1] = '\0';
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4091
#ifdef  __WIN__
4092
	innobase_casedn_str(namebuf);
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4093
#endif
4094
	trx = trx_allocate_for_mysql();
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4095 4096
	trx->mysql_thd = current_thd;
	trx->mysql_query_str = &((*current_thd).query);
4097

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4098 4099 4100 4101
	if (current_thd->options & OPTION_NO_FOREIGN_KEY_CHECKS) {
		trx->check_foreigns = FALSE;
	}

4102
  	error = row_drop_database_for_mysql(namebuf, trx);
4103
	my_free(namebuf, MYF(0));
4104

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Merge  
monty@donna.mysql.fi committed
4105 4106 4107
	/* Flush the log to reduce probability that the .frm files and
	the InnoDB data dictionary get out-of-sync if the user runs
	with innodb_flush_log_at_trx_commit = 0 */
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monty@hundin.mysql.fi committed
4108

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heikki@hundin.mysql.fi committed
4109
	log_buffer_flush_to_disk();
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Merge  
monty@donna.mysql.fi committed
4110

4111 4112 4113 4114 4115
	/* Tell the InnoDB server that there might be work for
	utility threads: */

	srv_active_wake_master_thread();

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4116
  	innobase_commit_low(trx);
4117 4118
  	trx_free_for_mysql(trx);

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4119
	error = convert_error_code_to_mysql(error, NULL);
4120 4121 4122 4123

	return(error);
}

4124
/*************************************************************************
4125
Renames an InnoDB table. */
4126 4127 4128 4129 4130 4131 4132 4133 4134 4135 4136

int
ha_innobase::rename_table(
/*======================*/
				/* out: 0 or error code */
	const char*	from,	/* in: old name of the table */
	const char*	to)	/* in: new name of the table */
{
	ulint	name_len1;
	ulint	name_len2;
	int	error;
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4137
	trx_t*	parent_trx;
4138
	trx_t*	trx;
4139 4140
	char	norm_from[1000];
	char	norm_to[1000];
4141

4142 4143
  	DBUG_ENTER("ha_innobase::rename_table");

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4144 4145 4146
	/* Get the transaction associated with the current thd, or create one
	if not yet created */
	
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4147
	parent_trx = check_trx_exists(current_thd);
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4148 4149 4150 4151 4152 4153

	/* In case MySQL calls this in the middle of a SELECT query, release
	possible adaptive hash latch to avoid deadlocks of threads */

	trx_search_latch_release_if_reserved(parent_trx);	

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4154 4155 4156 4157 4158 4159
	if (lower_case_table_names) {
		srv_lower_case_table_names = TRUE;
	} else {
		srv_lower_case_table_names = FALSE;
	}

4160
	trx = trx_allocate_for_mysql();
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4161 4162
	trx->mysql_thd = current_thd;
	trx->mysql_query_str = &((*current_thd).query);
4163 4164 4165 4166 4167 4168

	name_len1 = strlen(from);
	name_len2 = strlen(to);

	assert(name_len1 < 1000);
	assert(name_len2 < 1000);
4169

4170 4171 4172
	normalize_table_name(norm_from, from);
	normalize_table_name(norm_to, to);

4173
  	/* Rename the table in InnoDB */
4174

4175
  	error = row_rename_table_for_mysql(norm_from, norm_to, trx);
4176

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Merge  
monty@donna.mysql.fi committed
4177 4178 4179
	/* Flush the log to reduce probability that the .frm files and
	the InnoDB data dictionary get out-of-sync if the user runs
	with innodb_flush_log_at_trx_commit = 0 */
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monty@hundin.mysql.fi committed
4180

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heikki@hundin.mysql.fi committed
4181
	log_buffer_flush_to_disk();
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Merge  
monty@donna.mysql.fi committed
4182

4183
	/* Tell the InnoDB server that there might be work for
4184 4185 4186 4187
	utility threads: */

	srv_active_wake_master_thread();

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heikki@hundin.mysql.fi committed
4188
  	innobase_commit_low(trx);
4189 4190
  	trx_free_for_mysql(trx);

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4191
	error = convert_error_code_to_mysql(error, NULL);
4192 4193 4194 4195 4196 4197 4198 4199 4200 4201

	DBUG_RETURN(error);
}

/*************************************************************************
Estimates the number of index records in a range. */

ha_rows
ha_innobase::records_in_range(
/*==========================*/
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4202 4203
						/* out: estimated number of
						rows */
4204 4205 4206 4207 4208
	uint 			keynr,		/* in: index number */
        key_range		*min_key,	/* in: start key value of the
                                                   range, may also be 0 */
	key_range		*max_key)	/* in: range end key val, may
                                                   also be 0 */
4209 4210 4211 4212
{
	row_prebuilt_t* prebuilt	= (row_prebuilt_t*) innobase_prebuilt;
	KEY*		key;
	dict_index_t*	index;
4213
	mysql_byte*	key_val_buff2 	= (mysql_byte*) my_malloc(
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4214 4215
						  table->reclength
      						+ table->max_key_length + 100,
4216
								MYF(MY_WME));
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4217 4218
	ulint		buff2_len = table->reclength
      						+ table->max_key_length + 100;
4219
	dtuple_t*	range_start;
4220
	dtuple_t*	range_end;
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4221
	ib_longlong	n_rows;
4222 4223
	ulint		mode1;
	ulint		mode2;
4224 4225
	void*           heap1;
	void*           heap2;
4226

4227
   	DBUG_ENTER("records_in_range");
4228

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4229 4230
	prebuilt->trx->op_info = (char*)"estimating records in index range";

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	/* In case MySQL calls this in the middle of a SELECT query, release
	possible adaptive hash latch to avoid deadlocks of threads */

	trx_search_latch_release_if_reserved(prebuilt->trx);
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4235

4236 4237 4238
	active_index = keynr;

	key = table->key_info + active_index;
4239

4240
	index = dict_table_get_index_noninline(prebuilt->table, key->name);
4241

4242
	range_start = dtuple_create_for_mysql(&heap1, key->key_parts);
4243
 	dict_index_copy_types(range_start, index, key->key_parts);
4244

4245
	range_end = dtuple_create_for_mysql(&heap2, key->key_parts);
4246
 	dict_index_copy_types(range_end, index, key->key_parts);
4247

4248
	row_sel_convert_mysql_key_to_innobase(
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4249 4250 4251
				range_start, (byte*) key_val_buff,
				(ulint)upd_and_key_val_buff_len,
				index,
4252 4253
				(byte*) (min_key ? min_key->key :
                                         (const mysql_byte*) 0),
4254 4255
				(ulint) (min_key ? min_key->length : 0),
				prebuilt->trx);
4256

4257
	row_sel_convert_mysql_key_to_innobase(
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				range_end, (byte*) key_val_buff2,
				buff2_len, index,
4260 4261
				(byte*) (max_key ? max_key->key :
                                         (const mysql_byte*) 0),
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				(ulint) (max_key ? max_key->length : 0),
				prebuilt->trx);
4264 4265 4266 4267 4268

	mode1 = convert_search_mode_to_innobase(min_key ? min_key->flag :
                                                HA_READ_KEY_EXACT);
	mode2 = convert_search_mode_to_innobase(max_key ? max_key->flag :
                                                HA_READ_KEY_EXACT);
4269

4270
	n_rows = btr_estimate_n_rows_in_range(index, range_start,
4271
						mode1, range_end, mode2);
4272 4273
	dtuple_free_for_mysql(heap1);
	dtuple_free_for_mysql(heap2);
4274

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    	my_free((char*) key_val_buff2, MYF(0));

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	prebuilt->trx->op_info = (char*)"";

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	/* The MySQL optimizer seems to believe an estimate of 0 rows is
	always accurate and may return the result 'Empty set' based on that.
	The accuracy is not guaranteed, and even if it were, for a locking
	read we should anyway perform the search to set the next-key lock.
	Add 1 to the value to make sure MySQL does not make the assumption! */

	if (n_rows == 0) {
	        n_rows = 1;
	}

4289 4290 4291
	DBUG_RETURN((ha_rows) n_rows);
}

4292 4293
/*************************************************************************
Gives an UPPER BOUND to the number of rows in a table. This is used in
4294
filesort.cc. */
4295 4296

ha_rows
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4297
ha_innobase::estimate_rows_upper_bound(void)
4298
/*======================================*/
4299
			/* out: upper bound of rows */
4300 4301
{
	row_prebuilt_t* prebuilt	= (row_prebuilt_t*) innobase_prebuilt;
4302 4303
	dict_index_t*	index;
	ulonglong	estimate;
4304
	ulonglong	local_data_file_length;
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4305

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4306
 	DBUG_ENTER("estimate_rows_upper_bound");
4307

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	/* We do not know if MySQL can call this function before calling
	external_lock(). To be safe, update the thd of the current table
	handle. */

	update_thd(current_thd);

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	prebuilt->trx->op_info = (char*)
	                         "calculating upper bound for table rows";

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	/* In case MySQL calls this in the middle of a SELECT query, release
	possible adaptive hash latch to avoid deadlocks of threads */

	trx_search_latch_release_if_reserved(prebuilt->trx);
4321

4322
	index = dict_table_get_first_index_noninline(prebuilt->table);
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4323

4324
	local_data_file_length = ((ulonglong) index->stat_n_leaf_pages)
4325
    							* UNIV_PAGE_SIZE;
4326

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	/* Calculate a minimum length for a clustered index record and from
	that an upper bound for the number of rows. Since we only calculate
4329 4330
	new statistics in row0mysql.c when a table has grown by a threshold
	factor, we must add a safety factor 2 in front of the formula below. */
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4331

4332 4333
	estimate = 2 * local_data_file_length /
					 dict_index_calc_min_rec_len(index);
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4334

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	prebuilt->trx->op_info = (char*)"";

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4337
	DBUG_RETURN((ha_rows) estimate);
4338 4339
}

4340 4341 4342 4343 4344 4345 4346 4347 4348 4349 4350 4351
/*************************************************************************
How many seeks it will take to read through the table. This is to be
comparable to the number returned by records_in_range so that we can
decide if we should scan the table or use keys. */

double
ha_innobase::scan_time()
/*====================*/
			/* out: estimated time measured in disk seeks */
{
	row_prebuilt_t* prebuilt	= (row_prebuilt_t*) innobase_prebuilt;

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	/* Since MySQL seems to favor table scans too much over index
	searches, we pretend that a sequential read takes the same time
	as a random disk read, that is, we do not divide the following
	by 10, which would be physically realistic. */
	
	return((double) (prebuilt->table->stat_clustered_index_size));
4358 4359
}

4360 4361 4362
/**********************************************************************
Calculate the time it takes to read a set of ranges through an index
This enables us to optimise reads for clustered indexes. */
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4363

4364 4365 4366 4367 4368 4369 4370
double
ha_innobase::read_time(
/*===================*/
			/* out: estimated time measured in disk seeks */
	uint    index,	/* in: key number */
	uint	ranges,	/* in: how many ranges */
	ha_rows rows)	/* in: estimated number of rows in the ranges */
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{
4372 4373 4374 4375 4376 4377 4378 4379 4380 4381 4382 4383
	ha_rows total_rows;
	double  time_for_scan;
  
	if (index != table->primary_key)
	  return handler::read_time(index, ranges, rows); // Not clustered

	if (rows <= 2)
	  return (double) rows;

	/* Assume that the read time is proportional to the scan time for all
	rows + at most one seek per range. */

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4384
	time_for_scan = scan_time();
4385

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4386
	if ((total_rows = estimate_rows_upper_bound()) < rows)
4387 4388 4389
	  return time_for_scan;

	return (ranges + (double) rows / (double) total_rows * time_for_scan);
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}

4392 4393 4394 4395 4396 4397 4398 4399 4400 4401 4402 4403
/*************************************************************************
Returns statistics information of the table to the MySQL interpreter,
in various fields of the handle object. */

void
ha_innobase::info(
/*==============*/
	uint flag)	/* in: what information MySQL requests */
{
	row_prebuilt_t* prebuilt	= (row_prebuilt_t*) innobase_prebuilt;
	dict_table_t*	ib_table;
	dict_index_t*	index;
4404
	ha_rows		rec_per_key;
4405 4406
	ulong		j;
	ulong		i;
4407 4408
	char		path[FN_REFLEN];
	os_file_stat_t  stat_info;
4409

4410 4411
 	DBUG_ENTER("info");

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4412 4413 4414 4415 4416 4417
        /* If we are forcing recovery at a high level, we will suppress
	statistics calculation on tables, because that may crash the
	server if an index is badly corrupted. */

        if (srv_force_recovery >= SRV_FORCE_NO_IBUF_MERGE) {

4418
                DBUG_VOID_RETURN;
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4419 4420
        }

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4421 4422 4423 4424 4425 4426 4427 4428 4429
	/* We do not know if MySQL can call this function before calling
	external_lock(). To be safe, update the thd of the current table
	handle. */

	update_thd(current_thd);

	/* In case MySQL calls this in the middle of a SELECT query, release
	possible adaptive hash latch to avoid deadlocks of threads */

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	prebuilt->trx->op_info = (char*)"returning various info to MySQL";

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4432
	trx_search_latch_release_if_reserved(prebuilt->trx);
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4433

4434 4435 4436 4437 4438 4439
 	ib_table = prebuilt->table;

 	if (flag & HA_STATUS_TIME) {
 		/* In sql_show we call with this flag: update then statistics
 		so that they are up-to-date */

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4440 4441
	        prebuilt->trx->op_info = (char*)"updating table statistics";

4442
 		dict_update_statistics(ib_table);
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4443 4444 4445

		prebuilt->trx->op_info = (char*)
		                          "returning various info to MySQL";
4446 4447 4448 4449 4450 4451 4452 4453 4454 4455 4456 4457 4458 4459

		if (ib_table->space != 0) {
			my_snprintf(path, sizeof(path), "%s/%s%s",
				    mysql_data_home, ib_table->name,
				    ".ibd");
			unpack_filename(path,path);
		} else {
			my_snprintf(path, sizeof(path), "%s/%s%s", 
				    mysql_data_home, ib_table->name,
				    reg_ext);
		
			unpack_filename(path,path);
		}

4460 4461 4462
		/* Note that we do not know the access time of the table, 
		nor the CHECK TABLE time, nor the UPDATE or INSERT time. */

4463 4464 4465
		if (os_file_get_status(path,&stat_info)) {
			create_time = stat_info.ctime;
		}
4466 4467 4468
 	}

	if (flag & HA_STATUS_VARIABLE) {
4469
    		records = (ha_rows)ib_table->stat_n_rows;
4470 4471 4472 4473 4474 4475 4476 4477 4478 4479 4480 4481 4482
    		deleted = 0;
    		data_file_length = ((ulonglong)
				ib_table->stat_clustered_index_size)
    					* UNIV_PAGE_SIZE;
    		index_file_length = ((ulonglong)
				ib_table->stat_sum_of_other_index_sizes)
    					* UNIV_PAGE_SIZE;
    		delete_length = 0;
    		check_time = 0;

    		if (records == 0) {
    			mean_rec_length = 0;
    		} else {
4483
    			mean_rec_length = (ulong) (data_file_length / records);
4484 4485 4486 4487 4488 4489 4490 4491 4492
    		}
    	}

	if (flag & HA_STATUS_CONST) {
		index = dict_table_get_first_index_noninline(ib_table);

		if (prebuilt->clust_index_was_generated) {
			index = dict_table_get_next_index_noninline(index);
		}
4493

4494
		for (i = 0; i < table->keys; i++) {
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4495 4496 4497 4498 4499 4500 4501 4502 4503 4504 4505
			if (index == NULL) {
				ut_print_timestamp(stderr);
			        fprintf(stderr,
"  InnoDB: Error: table %s contains less indexes inside InnoDB\n"
"InnoDB: than are defined in the MySQL .frm file. Have you mixed up\n"
"InnoDB: .frm files from different installations? See section\n"
"InnoDB: 15.1 at http://www.innodb.com/ibman.html\n",
				   ib_table->name);
				break;
			}

4506 4507
			for (j = 0; j < table->key_info[i].key_parts; j++) {

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4508 4509 4510 4511 4512 4513 4514 4515
				if (j + 1 > index->n_uniq) {
				        ut_print_timestamp(stderr);
			                fprintf(stderr,
"  InnoDB: Error: index %s of %s has %lu columns unique inside InnoDB\n"
"InnoDB: but MySQL is asking statistics for %lu columns. Have you mixed up\n"
"InnoDB: .frm files from different installations? See section\n"
"InnoDB: 15.1 at http://www.innodb.com/ibman.html\n",
						index->name,
4516 4517
						ib_table->name,
						(unsigned long) index->n_uniq,
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4518 4519 4520 4521
						j + 1);
				        break;
				}

4522 4523 4524 4525
				if (index->stat_n_diff_key_vals[j + 1] == 0) {

					rec_per_key = records;
				} else {
4526
					rec_per_key = (ha_rows)(records /
4527 4528 4529
   				         index->stat_n_diff_key_vals[j + 1]);
				}

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4530 4531 4532 4533 4534 4535 4536
				/* Since MySQL seems to favor table scans
				too much over index searches, we pretend
				index selectivity is 2 times better than
				our estimate: */

				rec_per_key = rec_per_key / 2;

4537 4538 4539
				if (rec_per_key == 0) {
					rec_per_key = 1;
				}
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4540

4541 4542 4543
 				table->key_info[i].rec_per_key[j]=
				  rec_per_key >= ~(ulong) 0 ? ~(ulong) 0 :
				  rec_per_key;
4544
			}
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4545

4546
			index = dict_table_get_next_index_noninline(index);
4547 4548
		}
	}
4549 4550

  	if (flag & HA_STATUS_ERRKEY) {
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4551 4552
		ut_a(prebuilt->trx && prebuilt->trx->magic_n == TRX_MAGIC_N);

4553
		errkey = (unsigned int) row_get_mysql_key_number_for_index(
4554 4555
				       (dict_index_t*)
				       trx_get_error_info(prebuilt->trx));
4556 4557
  	}

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4558 4559
	prebuilt->trx->op_info = (char*)"";

4560 4561 4562
  	DBUG_VOID_RETURN;
}

4563
/**************************************************************************
heikki@hundin.mysql.fi's avatar
heikki@hundin.mysql.fi committed
4564 4565
Updates index cardinalities of the table, based on 8 random dives into
each index tree. This does NOT calculate exact statistics on the table. */
4566 4567 4568 4569 4570 4571 4572 4573 4574 4575 4576 4577 4578 4579

int
ha_innobase::analyze(
/*=================*/			 
					/* out: returns always 0 (success) */
	THD*		thd,		/* in: connection thread handle */
	HA_CHECK_OPT*	check_opt)	/* in: currently ignored */
{
	/* Simply call ::info() with all the flags */
	info(HA_STATUS_TIME | HA_STATUS_CONST | HA_STATUS_VARIABLE);

	return(0);
}

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4580
/**************************************************************************
4581 4582
This is mapped to "ALTER TABLE tablename TYPE=InnoDB", which rebuilds
the table in MySQL. */
4583

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4584 4585 4586 4587 4588
int
ha_innobase::optimize(
/*==================*/
	THD*		thd,		/* in: connection thread handle */
	HA_CHECK_OPT*	check_opt)	/* in: currently ignored */
4589
{
4590
        return(HA_ADMIN_TRY_ALTER);
4591 4592
}

4593 4594 4595 4596 4597 4598 4599 4600 4601 4602 4603 4604 4605 4606 4607 4608
/***********************************************************************
Tries to check that an InnoDB table is not corrupted. If corruption is
noticed, prints to stderr information about it. In case of corruption
may also assert a failure and crash the server. */

int
ha_innobase::check(
/*===============*/
					/* out: HA_ADMIN_CORRUPT or
					HA_ADMIN_OK */
	THD* 		thd,		/* in: user thread handle */
	HA_CHECK_OPT* 	check_opt)	/* in: check options, currently
					ignored */
{
	row_prebuilt_t* prebuilt	= (row_prebuilt_t*) innobase_prebuilt;
	ulint		ret;
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4609

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4610
	ut_a(prebuilt->trx && prebuilt->trx->magic_n == TRX_MAGIC_N);
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4611 4612
	ut_a(prebuilt->trx ==
		(trx_t*) current_thd->transaction.all.innobase_tid);
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4613

4614 4615 4616 4617 4618 4619 4620 4621 4622 4623 4624 4625
	if (prebuilt->mysql_template == NULL) {
		/* Build the template; we will use a dummy template
		in index scans done in checking */

		build_template(prebuilt, NULL, table, ROW_MYSQL_WHOLE_ROW);
	}

	ret = row_check_table_for_mysql(prebuilt);

	if (ret == DB_SUCCESS) {
		return(HA_ADMIN_OK);
	}
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4626

4627 4628 4629
  	return(HA_ADMIN_CORRUPT); 
}

4630
/*****************************************************************
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Merge  
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4631 4632 4633
Adds information about free space in the InnoDB tablespace to a table comment
which is printed out when a user calls SHOW TABLE STATUS. Adds also info on
foreign keys. */
4634 4635 4636 4637

char*
ha_innobase::update_table_comment(
/*==============================*/
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Merge  
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4638 4639 4640
				/* out: table comment + InnoDB free space +
				info on foreign keys */
        const char*	comment)/* in: table comment defined by user */
4641
{
4642 4643 4644
	uint	length			= strlen(comment);
	char*				str;
	row_prebuilt_t*	prebuilt	= (row_prebuilt_t*)innobase_prebuilt;
4645

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4646 4647 4648 4649
	/* We do not know if MySQL can call this function before calling
	external_lock(). To be safe, update the thd of the current table
	handle. */

4650 4651 4652 4653
	if(length > 64000 - 3) {
		return((char*)comment); /* string too long */
	}

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4654 4655
	update_thd(current_thd);

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4656 4657
	prebuilt->trx->op_info = (char*)"returning table comment";

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4658 4659 4660 4661
	/* In case MySQL calls this in the middle of a SELECT query, release
	possible adaptive hash latch to avoid deadlocks of threads */

	trx_search_latch_release_if_reserved(prebuilt->trx);
4662
	str = NULL;
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4663

4664
	if (FILE* file = os_file_create_tmpfile()) {
4665
		long	flen;
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Merge  
monty@donna.mysql.fi committed
4666

4667 4668
		/* output the data to a temporary file */
		fprintf(file, "InnoDB free: %lu kB",
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4669 4670 4671
      		   (ulong) fsp_get_available_space_in_free_extents(
      					prebuilt->table->space));

4672 4673
		dict_print_info_on_foreign_keys(FALSE, file,
				prebuilt->trx, prebuilt->table);
4674
		flen = ftell(file);
4675 4676 4677
		if (flen < 0) {
			flen = 0;
		} else if (length + flen + 3 > 64000) {
4678 4679
			flen = 64000 - 3 - length;
		}
4680

4681 4682
		/* allocate buffer for the full string, and
		read the contents of the temporary file */
4683

4684
		str = my_malloc(length + flen + 3, MYF(0));
4685

4686 4687 4688 4689 4690 4691 4692 4693 4694 4695 4696 4697 4698
		if (str) {
			char* pos	= str + length;
			if(length) {
				memcpy(str, comment, length);
				*pos++ = ';';
				*pos++ = ' ';
			}
			rewind(file);
			flen = fread(pos, 1, flen, file);
			pos[flen] = 0;
		}

		fclose(file);
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4699
	}
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4700

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4701 4702
        prebuilt->trx->op_info = (char*)"";

4703
  	return(str ? str : (char*) comment);
4704 4705
}

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4706 4707 4708 4709 4710 4711 4712 4713 4714 4715 4716
/***********************************************************************
Gets the foreign key create info for a table stored in InnoDB. */

char*
ha_innobase::get_foreign_key_create_info(void)
/*==========================================*/
			/* out, own: character string in the form which
			can be inserted to the CREATE TABLE statement,
			MUST be freed with ::free_foreign_key_create_info */
{
	row_prebuilt_t* prebuilt = (row_prebuilt_t*)innobase_prebuilt;
4717
	char*	str	= 0;
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4718

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heikki@hundin.mysql.fi committed
4719
	ut_a(prebuilt != NULL);
4720

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4721 4722 4723 4724 4725 4726
	/* We do not know if MySQL can call this function before calling
	external_lock(). To be safe, update the thd of the current table
	handle. */

	update_thd(current_thd);

4727
	if (FILE* file = os_file_create_tmpfile()) {
4728
		long	flen;
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4729

4730
		prebuilt->trx->op_info = (char*)"getting info on foreign keys";
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4731

4732 4733 4734
		/* In case MySQL calls this in the middle of a SELECT query,
		release possible adaptive hash latch to avoid
		deadlocks of threads */
4735

4736
		trx_search_latch_release_if_reserved(prebuilt->trx);
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4737

4738
		/* output the data to a temporary file */
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		dict_print_info_on_foreign_keys(TRUE, file,
				prebuilt->trx, prebuilt->table);
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		prebuilt->trx->op_info = (char*)"";

		flen = ftell(file);
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		if (flen < 0) {
			flen = 0;
		} else if(flen > 64000 - 1) {
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			flen = 64000 - 1;
		}

		/* allocate buffer for the string, and
		read the contents of the temporary file */

		str = my_malloc(flen + 1, MYF(0));

		if (str) {
			rewind(file);
			flen = fread(str, 1, flen, file);
			str[flen] = 0;
		}

		fclose(file);
	} else {
		/* unable to create temporary file */
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          	str = my_malloc(1, MYF(MY_ZEROFILL));
4765
	}
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  	return(str);
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}

/***********************************************************************
Checks if a table is referenced by a foreign key. The MySQL manual states that
a REPLACE is either equivalent to an INSERT, or DELETE(s) + INSERT. Only a
delete is then allowed internally to resolve a duplicate key conflict in
REPLACE, not an update. */

uint
ha_innobase::referenced_by_foreign_key(void)
/*========================================*/
			/* out: > 0 if referenced by a FOREIGN KEY */
{
	row_prebuilt_t* prebuilt = (row_prebuilt_t*)innobase_prebuilt;

	if (dict_table_referenced_by_foreign_key(prebuilt->table)) {

		return(1);
	}

	return(0);
}
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/***********************************************************************
Frees the foreign key create info for a table stored in InnoDB, if it is
non-NULL. */

void
ha_innobase::free_foreign_key_create_info(
/*======================================*/
	char*	str)	/* in, own: create info string to free  */
{
	if (str) {
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		my_free(str, MYF(0));
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	}
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}

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/***********************************************************************
Tells something additional to the handler about how to do things. */

int
ha_innobase::extra(
/*===============*/
			   /* out: 0 or error number */
	enum ha_extra_function operation)
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                           /* in: HA_EXTRA_RETRIEVE_ALL_COLS or some
			   other flag */
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{
	row_prebuilt_t*	prebuilt = (row_prebuilt_t*) innobase_prebuilt;

	/* Warning: since it is not sure that MySQL calls external_lock
	before calling this function, the trx field in prebuilt can be
	obsolete! */

	switch (operation) {
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                case HA_EXTRA_FLUSH:
                        if (prebuilt->blob_heap) {
                                row_mysql_prebuilt_free_blob_heap(prebuilt);
                        }
                        break;
                case HA_EXTRA_RESET:
                        if (prebuilt->blob_heap) {
                                row_mysql_prebuilt_free_blob_heap(prebuilt);
                        }
                        prebuilt->read_just_key = 0;
                        break;
  		case HA_EXTRA_RESET_STATE:
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	        	prebuilt->read_just_key = 0;
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    	        	break;
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		case HA_EXTRA_NO_KEYREAD:
    			prebuilt->read_just_key = 0;
    			break;
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	        case HA_EXTRA_RETRIEVE_ALL_COLS:
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			prebuilt->hint_need_to_fetch_extra_cols
					= ROW_RETRIEVE_ALL_COLS;
			break;
	        case HA_EXTRA_RETRIEVE_PRIMARY_KEY:
			if (prebuilt->hint_need_to_fetch_extra_cols == 0) {
				prebuilt->hint_need_to_fetch_extra_cols
					= ROW_RETRIEVE_PRIMARY_KEY;
			}
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			break;
	        case HA_EXTRA_KEYREAD:
	        	prebuilt->read_just_key = 1;
	        	break;
		default:/* Do nothing */
			;
	}

	return(0);
}

4860
/**********************************************************************
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MySQL calls this function at the start of each SQL statement inside LOCK
TABLES. Inside LOCK TABLES the ::external_lock method does not work to
mark SQL statement borders. Note also a special case: if a temporary table
is created inside LOCK TABLES, MySQL has not called external_lock() at all
on that table. */
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int
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ha_innobase::start_stmt(
/*====================*/
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	              /* out: 0 or error code */
	THD*    thd)  /* in: handle to the user thread */
{
	row_prebuilt_t* prebuilt = (row_prebuilt_t*) innobase_prebuilt;
	trx_t*		trx;

	update_thd(thd);

	trx = prebuilt->trx;

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	/* Here we release the search latch and the InnoDB thread FIFO ticket
	if they were reserved. They should have been released already at the
	end of the previous statement, but because inside LOCK TABLES the
	lock count method does not work to mark the end of a SELECT statement,
	that may not be the case. We MUST release the search latch before an
	INSERT, for example. */

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	innobase_release_stat_resources(trx);

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	if (trx->isolation_level <= TRX_ISO_READ_COMMITTED
	    						&& trx->read_view) {
	    	/* At low transaction isolation levels we let
		each consistent read set its own snapshot */

	    	read_view_close_for_mysql(trx);
	}

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	auto_inc_counter_for_this_stat = 0;
	prebuilt->sql_stat_start = TRUE;
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	prebuilt->hint_need_to_fetch_extra_cols = 0;
4900
	prebuilt->read_just_key = 0;
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	if (!prebuilt->mysql_has_locked) {
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	        /* This handle is for a temporary table created inside
	        this same LOCK TABLES; since MySQL does NOT call external_lock
	        in this case, we must use x-row locks inside InnoDB to be
	        prepared for an update of a row */
	  
	        prebuilt->select_lock_type = LOCK_X;
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	} else {
		if (trx->isolation_level != TRX_ISO_SERIALIZABLE
		    && thd->lex->sql_command == SQLCOM_SELECT
		    && thd->lex->lock_option == TL_READ) {
4913
	
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			/* For other than temporary tables, we obtain
			no lock for consistent read (plain SELECT). */

			prebuilt->select_lock_type = LOCK_NONE;
		} else {
			/* Not a consistent read: restore the
			select_lock_type value. The value of
			stored_select_lock_type was decided in:
			1) ::store_lock(),
			2) ::external_lock(), and
			3) ::init_table_handle_for_HANDLER(). */

			prebuilt->select_lock_type =
				prebuilt->stored_select_lock_type;
		}

		if (prebuilt->stored_select_lock_type != LOCK_S
		    && prebuilt->stored_select_lock_type != LOCK_X) {
			fprintf(stderr,
"InnoDB: Error: stored_select_lock_type is %lu inside ::start_stmt()!\n",
			prebuilt->stored_select_lock_type);

			/* Set the value to LOCK_X: this is just fault
			tolerance, we do not know what the correct value
			should be! */

			prebuilt->select_lock_type = LOCK_X;
		}
	}

4944
	/* Set the MySQL flag to mark that there is an active transaction */
4945
	thd->transaction.all.innodb_active_trans = 1;
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	return(0);
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}

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/**********************************************************************
Maps a MySQL trx isolation level code to the InnoDB isolation level code */
inline
ulint
innobase_map_isolation_level(
/*=========================*/
					/* out: InnoDB isolation level */
	enum_tx_isolation	iso)	/* in: MySQL isolation level code */
{
	switch(iso) {
		case ISO_REPEATABLE_READ: return(TRX_ISO_REPEATABLE_READ);
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		case ISO_READ_COMMITTED: return(TRX_ISO_READ_COMMITTED);
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		case ISO_SERIALIZABLE: return(TRX_ISO_SERIALIZABLE);
		case ISO_READ_UNCOMMITTED: return(TRX_ISO_READ_UNCOMMITTED);
		default: ut_a(0); return(0);
	}	
}
	
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/**********************************************************************
As MySQL will execute an external lock for every new table it uses when it
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starts to process an SQL statement (an exception is when MySQL calls
start_stmt for the handle) we can use this function to store the pointer to
the THD in the handle. We will also use this function to communicate
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to InnoDB that a new SQL statement has started and that we must store a
savepoint to our transaction handle, so that we are able to roll back
the SQL statement in case of an error. */

int
ha_innobase::external_lock(
/*=======================*/
4980
			        /* out: 0 */
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	THD*	thd,		/* in: handle to the user thread */
	int 	lock_type)	/* in: lock type */
{
	row_prebuilt_t* prebuilt = (row_prebuilt_t*) innobase_prebuilt;
	trx_t*		trx;

  	DBUG_ENTER("ha_innobase::external_lock");
4988
	DBUG_PRINT("enter",("lock_type: %d", lock_type));
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	update_thd(thd);

	trx = prebuilt->trx;

	prebuilt->sql_stat_start = TRUE;
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	prebuilt->hint_need_to_fetch_extra_cols = 0;
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	prebuilt->read_just_key = 0;

	if (lock_type == F_WRLCK) {

		/* If this is a SELECT, then it is in UPDATE TABLE ...
		or SELECT ... FOR UPDATE */
		prebuilt->select_lock_type = LOCK_X;
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		prebuilt->stored_select_lock_type = LOCK_X;
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	}

	if (lock_type != F_UNLCK) {
5008
		/* MySQL is setting a new table lock */
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		/* Set the MySQL flag to mark that there is an active
		transaction */
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		thd->transaction.all.innodb_active_trans = 1;
5013

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		trx->n_mysql_tables_in_use++;
5015
		prebuilt->mysql_has_locked = TRUE;
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		if (trx->n_mysql_tables_in_use == 1) {
		        trx->isolation_level = innobase_map_isolation_level(
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						(enum_tx_isolation)
						thd->variables.tx_isolation);
5021
		}
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		if (trx->isolation_level == TRX_ISO_SERIALIZABLE
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		    && prebuilt->select_lock_type == LOCK_NONE
		    && (thd->options
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				& (OPTION_NOT_AUTOCOMMIT | OPTION_BEGIN))) {
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			/* To get serializable execution, we let InnoDB
			conceptually add 'LOCK IN SHARE MODE' to all SELECTs
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			which otherwise would have been consistent reads. An
			exception is consistent reads in the AUTOCOMMIT=1 mode:
			we know that they are read-only transactions, and they
			can be serialized also if performed as consistent
			reads. */
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			prebuilt->select_lock_type = LOCK_S;
		}

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		/* Starting from 4.1.9, no InnoDB table lock is taken in LOCK
		TABLES if AUTOCOMMIT=1. It does not make much sense to acquire
		an InnoDB table lock if it is released immediately at the end
		of LOCK TABLES, and InnoDB's table locks in that case cause
		VERY easily deadlocks. */

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		if (prebuilt->select_lock_type != LOCK_NONE) {
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5047
			if (thd->in_lock_tables &&
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			    thd->variables.innodb_table_locks &&
			    (thd->options & OPTION_NOT_AUTOCOMMIT)) {
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5051
				ulint	error;
5052 5053
				error = row_lock_table_for_mysql(prebuilt,
							NULL, LOCK_TABLE_EXP);
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				if (error != DB_SUCCESS) {
					error = convert_error_code_to_mysql(
						error, user_thd);
					DBUG_RETURN(error);
				}
			}
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		  	trx->mysql_n_tables_locked++;
		}

5065
		DBUG_RETURN(0);
5066
	}
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	/* MySQL is releasing a table lock */
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	trx->n_mysql_tables_in_use--;
	prebuilt->mysql_has_locked = FALSE;
	auto_inc_counter_for_this_stat = 0;
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	if (trx->n_lock_table_exp) {
		row_unlock_tables_for_mysql(trx);
5075
	}
5076

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	/* If the MySQL lock count drops to zero we know that the current SQL
	statement has ended */
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5080
	if (trx->n_mysql_tables_in_use == 0) {
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	        trx->mysql_n_tables_locked = 0;
		prebuilt->used_in_HANDLER = FALSE;
			
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		/* Release a possible FIFO ticket and search latch. Since we
		may reserve the kernel mutex, we have to release the search
		system latch first to obey the latching order. */

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		innobase_release_stat_resources(trx);
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		if (!(thd->options & (OPTION_NOT_AUTOCOMMIT | OPTION_BEGIN))) {
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			if (thd->transaction.all.innodb_active_trans != 0) {
		    	        innobase_commit(thd, trx);
			}
		} else {
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			if (trx->isolation_level <= TRX_ISO_READ_COMMITTED
	    						&& trx->read_view) {

5099
				/* At low transaction isolation levels we let
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				each consistent read set its own snapshot */

5102
				read_view_close_for_mysql(trx);
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			}
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		}
	}

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	DBUG_RETURN(0);
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}

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/****************************************************************************
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Implements the SHOW INNODB STATUS command. Sends the output of the InnoDB
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Monitor to the client. */

int
innodb_show_status(
/*===============*/
	THD*	thd)	/* in: the MySQL query thread of the caller */
{
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        Protocol        *protocol= thd->protocol;
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	trx_t*		trx;
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        DBUG_ENTER("innodb_show_status");

5124
        if (have_innodb != SHOW_OPTION_YES) {
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                my_message(ER_NOT_SUPPORTED_YET,
          "Cannot call SHOW INNODB STATUS because skip-innodb is defined",
                           MYF(0));
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                DBUG_RETURN(-1);
        }
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	trx = check_trx_exists(thd);

	innobase_release_stat_resources(trx);

5135
	/* We let the InnoDB Monitor to output at most 64000 bytes of text. */
5136

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	long	flen;
	char*	str;
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5140
	mutex_enter_noninline(&srv_monitor_file_mutex);
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	rewind(srv_monitor_file);
	srv_printf_innodb_monitor(srv_monitor_file);
	flen = ftell(srv_monitor_file);
5144
	os_file_set_eof(srv_monitor_file);
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	if (flen < 0) {
		flen = 0;
	} else if (flen > 64000 - 1) {
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		flen = 64000 - 1;
	}
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	/* allocate buffer for the string, and
	read the contents of the temporary file */
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	if (!(str = my_malloc(flen + 1, MYF(0))))
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        {
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          mutex_exit_noninline(&srv_monitor_file_mutex);
          DBUG_RETURN(-1);
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        }
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	rewind(srv_monitor_file);
	flen = fread(str, 1, flen, srv_monitor_file);
5162

5163
	mutex_exit_noninline(&srv_monitor_file_mutex);
5164

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	List<Item> field_list;

5167
	field_list.push_back(new Item_empty_string("Status", flen));
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	if (protocol->send_fields(&field_list, 1)) {
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5170

5171
		my_free(str, MYF(0));
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5173
		DBUG_RETURN(-1);
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	}

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        protocol->prepare_for_resend();
        protocol->store(str, flen, system_charset_info);
        my_free(str, MYF(0));
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        if (protocol->write())
          DBUG_RETURN(-1);

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	send_eof(thd);
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  	DBUG_RETURN(0);
}

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/****************************************************************************
 Handling the shared INNOBASE_SHARE structure that is needed to provide table
 locking.
****************************************************************************/

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static mysql_byte* innobase_get_key(INNOBASE_SHARE *share,uint *length,
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			      my_bool not_used __attribute__((unused)))
{
  *length=share->table_name_length;
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  return (mysql_byte*) share->table_name;
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}

static INNOBASE_SHARE *get_share(const char *table_name)
{
  INNOBASE_SHARE *share;
  pthread_mutex_lock(&innobase_mutex);
  uint length=(uint) strlen(table_name);
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  if (!(share=(INNOBASE_SHARE*) hash_search(&innobase_open_tables,
5205
					(mysql_byte*) table_name,
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					    length)))
  {
    if ((share=(INNOBASE_SHARE *) my_malloc(sizeof(*share)+length+1,
				       MYF(MY_WME | MY_ZEROFILL))))
    {
      share->table_name_length=length;
      share->table_name=(char*) (share+1);
      strmov(share->table_name,table_name);
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      if (my_hash_insert(&innobase_open_tables, (mysql_byte*) share))
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      {
	pthread_mutex_unlock(&innobase_mutex);
	my_free((gptr) share,0);
	return 0;
      }
      thr_lock_init(&share->lock);
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      pthread_mutex_init(&share->mutex,MY_MUTEX_INIT_FAST);
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    }
  }
  share->use_count++;
  pthread_mutex_unlock(&innobase_mutex);
  return share;
}

static void free_share(INNOBASE_SHARE *share)
{
  pthread_mutex_lock(&innobase_mutex);
  if (!--share->use_count)
  {
5234
    hash_delete(&innobase_open_tables, (mysql_byte*) share);
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    thr_lock_delete(&share->lock);
    pthread_mutex_destroy(&share->mutex);
    my_free((gptr) share, MYF(0));
  }
  pthread_mutex_unlock(&innobase_mutex);
}
5241 5242

/*********************************************************************
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Converts a MySQL table lock stored in the 'lock' field of the handle to
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a proper type before storing pointer to the lock into an array of pointers.
MySQL also calls this if it wants to reset some table locks to a not-locked
state during the processing of an SQL query. An example is that during a
SELECT the read lock is released early on the 'const' tables where we only
fetch one row. MySQL does not call this when it releases all locks at the
end of an SQL statement. */
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THR_LOCK_DATA**
ha_innobase::store_lock(
/*====================*/
						/* out: pointer to the next
						element in the 'to' array */
	THD*			thd,		/* in: user thread handle */
	THR_LOCK_DATA**		to,		/* in: pointer to an array
						of pointers to lock structs;
						pointer to the 'lock' field
						of current handle is stored
						next to this array */
	enum thr_lock_type 	lock_type)	/* in: lock type to store in
						'lock' */
{
	row_prebuilt_t* prebuilt	= (row_prebuilt_t*) innobase_prebuilt;

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	if ((lock_type == TL_READ && thd->in_lock_tables) ||
	    (lock_type == TL_READ_HIGH_PRIORITY && thd->in_lock_tables) ||
	    lock_type == TL_READ_WITH_SHARED_LOCKS ||
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	    lock_type == TL_READ_NO_INSERT ||
	    thd->lex->sql_command != SQLCOM_SELECT) {

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		/* The OR cases above are in this order:
		1) MySQL is doing LOCK TABLES ... READ LOCAL, or
		2) (we do not know when TL_READ_HIGH_PRIORITY is used), or
		3) this is a SELECT ... IN SHARE MODE, or
		4) we are doing a complex SQL statement like
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		INSERT INTO ... SELECT ... and the logical logging (MySQL
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		binlog) requires the use of a locking read, or
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		MySQL is doing LOCK TABLES ... READ.
		5) we let InnoDB do locking reads for all SQL statements that
		are not simple SELECTs; note that select_lock_type in this
		case may get strengthened in ::external_lock() to LOCK_X. */
5284

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		if (srv_locks_unsafe_for_binlog &&
		    prebuilt->trx->isolation_level != TRX_ISO_SERIALIZABLE &&
		    (lock_type == TL_READ || lock_type == TL_READ_NO_INSERT) &&
		    thd->lex->sql_command != SQLCOM_SELECT &&
		    thd->lex->sql_command != SQLCOM_UPDATE_MULTI &&
		    thd->lex->sql_command != SQLCOM_DELETE_MULTI ) {

			/* In case we have innobase_locks_unsafe_for_binlog
			option set and isolation level of the transaction
			is not set to serializable and MySQL is doing
			INSERT INTO...SELECT without FOR UPDATE or IN
			SHARE MODE we use consistent read for select. 
			Similarly, in case of DELETE...SELECT and
			UPDATE...SELECT when these are not multi table.*/

			prebuilt->select_lock_type = LOCK_NONE;
			prebuilt->stored_select_lock_type = LOCK_NONE;
		} else {
			prebuilt->select_lock_type = LOCK_S;
			prebuilt->stored_select_lock_type = LOCK_S;
		}
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	} else if (lock_type != TL_IGNORE) {

	        /* In ha_berkeley.cc there is a comment that MySQL
	        may in exceptional cases call this with TL_IGNORE also
	        when it is NOT going to release the lock. */

	        /* We set possible LOCK_X value in external_lock, not yet
5314
		here even if this would be SELECT ... FOR UPDATE */
5315

5316
		prebuilt->select_lock_type = LOCK_NONE;
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		prebuilt->stored_select_lock_type = LOCK_NONE;
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	}

	if (lock_type != TL_IGNORE && lock.type == TL_UNLOCK) {

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    		/* If we are not doing a LOCK TABLE or DISCARD/IMPORT
		TABLESPACE, then allow multiple writers */
5324 5325

    		if ((lock_type >= TL_WRITE_CONCURRENT_INSERT &&
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	 	    lock_type <= TL_WRITE) && !thd->in_lock_tables
		    && !thd->tablespace_op) {
5328 5329 5330 5331

      			lock_type = TL_WRITE_ALLOW_WRITE;
      		}

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		/* In queries of type INSERT INTO t1 SELECT ... FROM t2 ...
		MySQL would use the lock TL_READ_NO_INSERT on t2, and that
		would conflict with TL_WRITE_ALLOW_WRITE, blocking all inserts
		to t2. Convert the lock to a normal read lock to allow
		concurrent inserts to t2. */
      		
		if (lock_type == TL_READ_NO_INSERT && !thd->in_lock_tables) {
			lock_type = TL_READ;
		}
		
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 		lock.type=lock_type;
  	}

  	*to++= &lock;
5346

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	return(to);
}

5350
/***********************************************************************
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This function initializes the auto-inc counter if it has not been
initialized yet. This function does not change the value of the auto-inc
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5353
counter if it already has been initialized. In paramete ret returns
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the value of the auto-inc counter. */
5355

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int
ha_innobase::innobase_read_and_init_auto_inc(
/*=========================================*/
				/* out: 0 or error code: deadlock or
				lock wait timeout */
	longlong*	ret)	/* out: auto-inc value */
5362
{
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  	row_prebuilt_t* prebuilt	= (row_prebuilt_t*) innobase_prebuilt;
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    	longlong        auto_inc;
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  	int     	error;
5366

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  	ut_a(prebuilt);
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	ut_a(prebuilt->trx ==
		(trx_t*) current_thd->transaction.all.innobase_tid);
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	ut_a(prebuilt->table);
	
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	/* In case MySQL calls this in the middle of a SELECT query, release
	possible adaptive hash latch to avoid deadlocks of threads */

	trx_search_latch_release_if_reserved(prebuilt->trx);

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	auto_inc = dict_table_autoinc_read(prebuilt->table);
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	if (auto_inc != 0) {
		/* Already initialized */
		*ret = auto_inc;
	
		return(0);
	}
5385

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5386
	error = row_lock_table_autoinc_for_mysql(prebuilt);
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	if (error != DB_SUCCESS) {
		error = convert_error_code_to_mysql(error, user_thd);
5390

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		goto func_exit;
	}	
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	/* Check again if someone has initialized the counter meanwhile */
	auto_inc = dict_table_autoinc_read(prebuilt->table);
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	if (auto_inc != 0) {
		*ret = auto_inc;
	
		return(0);
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	}
5402

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  	(void) extra(HA_EXTRA_KEYREAD);
  	index_init(table->next_number_index);

	/* We use an exclusive lock when we read the max key value from the
  	auto-increment column index. This is because then build_template will
  	advise InnoDB to fetch all columns. In SHOW TABLE STATUS the query
  	id of the auto-increment column is not changed, and previously InnoDB
  	did not fetch it, causing SHOW TABLE STATUS to show wrong values
  	for the autoinc column. */
5412

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  	prebuilt->select_lock_type = LOCK_X;
5414

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  	/* Play safe and also give in another way the hint to fetch
  	all columns in the key: */
  	
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	prebuilt->hint_need_to_fetch_extra_cols = ROW_RETRIEVE_ALL_COLS;
5419

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	prebuilt->trx->mysql_n_tables_locked += 1;
5421
  
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	error = index_last(table->record[1]);
5423

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  	if (error) {
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		if (error == HA_ERR_END_OF_FILE) {
			/* The table was empty, initialize to 1 */
			auto_inc = 1;

			error = 0;
		} else {
			/* Deadlock or a lock wait timeout */
  			auto_inc = -1;

  			goto func_exit;
  		}
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  	} else {
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		/* Initialize to max(col) + 1 */
    		auto_inc = (longlong) table->next_number_field->
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                        	val_int_offset(table->rec_buff_length) + 1;
  	}
5441

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	dict_table_autoinc_initialize(prebuilt->table, auto_inc);

func_exit:
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  	(void) extra(HA_EXTRA_NO_KEYREAD);
5446

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	index_end();

	*ret = auto_inc;

  	return(error);
}

/***********************************************************************
This function initializes the auto-inc counter if it has not been
initialized yet. This function does not change the value of the auto-inc
counter if it already has been initialized. Returns the value of the
auto-inc counter. */

longlong
ha_innobase::get_auto_increment()
/*=============================*/
                         /* out: auto-increment column value, -1 if error
                         (deadlock or lock wait timeout) */
{
  	longlong        nr;
  	int     	error;
	
	error = innobase_read_and_init_auto_inc(&nr);

	if (error) {

		return(-1);
	}
5475

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	return(nr);
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}

5479
/***********************************************************************
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This function stores the binlog offset and flushes logs. */
5481 5482 5483

void 
innobase_store_binlog_offset_and_flush_log(
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/*=======================================*/
    char 	*binlog_name,	/* in: binlog name */
    longlong 	offset)		/* in: binlog offset */
{
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	mtr_t mtr;
	
	assert(binlog_name != NULL);

	/* Start a mini-transaction */
        mtr_start_noninline(&mtr); 

	/* Update the latest MySQL binlog name and offset info
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        in trx sys header */
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        trx_sys_update_mysql_binlog_offset(
            binlog_name,
            offset,
            TRX_SYS_MYSQL_LOG_INFO, &mtr);

        /* Commits the mini-transaction */
        mtr_commit(&mtr);
        
	/* Syncronous flush of the log buffer to disk */
	log_buffer_flush_to_disk();
}
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char*
ha_innobase::get_mysql_bin_log_name()
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{
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	return(trx_sys_mysql_bin_log_name);
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}

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ulonglong
ha_innobase::get_mysql_bin_log_pos()
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{
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  	/* trx... is ib_longlong, which is a typedef for a 64-bit integer
	(__int64 or longlong) so it's ok to cast it to ulonglong. */

  	return(trx_sys_mysql_bin_log_pos);
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}

5525
extern "C" {
5526
/**********************************************************************
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This function is used to find the storage length in bytes of the first n
characters for prefix indexes using a multibyte character set. The function
finds charset information and returns length of prefix_len characters in the
index field in bytes.

NOTE: the prototype of this function is copied to data0type.c! If you change
this function, you MUST change also data0type.c! */
5534

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ulint
innobase_get_at_most_n_mbchars(
/*===========================*/
				/* out: number of bytes occupied by the first
				n characters */
5540
	ulint charset_id,	/* in: character set id */
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	ulint prefix_len,	/* in: prefix length in bytes of the index
				(this has to be divided by mbmaxlen to get the
				number of CHARACTERS n in the prefix) */
	ulint data_len,         /* in: length of the string in bytes */
	const char* str)	/* in: character string */
5546
{
5547
	ulint char_length;	/* character length in bytes */
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	ulint n_chars;		/* number of characters in prefix */
5549
	CHARSET_INFO* charset;	/* charset used in the field */
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	charset = get_charset(charset_id, MYF(MY_WME));
5552

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	ut_ad(charset);
	ut_ad(charset->mbmaxlen);
5555

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	/* Calculate how many characters at most the prefix index contains */
5557

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	n_chars = prefix_len / charset->mbmaxlen;
5559

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	/* If the charset is multi-byte, then we must find the length of the
	first at most n chars in the string. If the string contains less
	characters than n, then we return the length to the end of the last
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	character. */
5564

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	if (charset->mbmaxlen > 1) {
		/* my_charpos() returns the byte length of the first n_chars
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		characters, or a value bigger than the length of str, if
		there were not enough full characters in str.

		Why does the code below work:
		Suppose that we are looking for n UTF-8 characters.

		1) If the string is long enough, then the prefix contains at
		least n complete UTF-8 characters + maybe some extra
		characters + an incomplete UTF-8 character. No problem in
		this case. The function returns the pointer to the
		end of the nth character.

		2) If the string is not long enough, then the string contains
		the complete value of a column, that is, only complete UTF-8
		characters, and we can store in the column prefix index the
		whole string. */
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		char_length = my_charpos(charset, str,
						str + data_len, n_chars);
		if (char_length > data_len) {
			char_length = data_len;
		}		
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	} else {
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		if (data_len < prefix_len) {
			char_length = data_len;
		} else {
			char_length = prefix_len;
		}
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	}
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	return(char_length);
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}
}

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extern "C" {
/**********************************************************************
This function returns true if SQL-query in the current thread
is either REPLACE or LOAD DATA INFILE REPLACE. 
NOTE that /mysql/innobase/row/row0ins.c must contain the 
prototype for this function ! */

ibool
innobase_query_is_replace(void)
/*===========================*/
{
	THD*	thd;
	
	thd = (THD *)innobase_current_thd();
	
	if ( thd->lex->sql_command == SQLCOM_REPLACE ||
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	     thd->lex->sql_command == SQLCOM_REPLACE_SELECT ||
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	     ( thd->lex->sql_command == SQLCOM_LOAD &&
	       thd->lex->duplicates == DUP_REPLACE )) {
		return true;
	} else {
		return false;
	}
}
}

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#endif /* HAVE_INNOBASE_DB */