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/* Copyright (C) 2000-2004 MySQL AB
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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
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   the Free Software Foundation.

   There are special exceptions to the terms and conditions of the GPL as it
   is applied to this software. View the full text of the exception in file
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   EXCEPTIONS-CLIENT in the directory of this software distribution.
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   This program is distributed in the hope that it will be useful,
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   but WITHOUT ANY WARRANTY; without even the implied warranty of
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   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   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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#include <my_global.h>
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#include <my_sys.h>
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#include <my_time.h>
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#include <mysys_err.h>
#include <m_string.h>
#include <m_ctype.h>
#include "mysql.h"
#include "mysql_version.h"
#include "mysqld_error.h"
#include "errmsg.h"
#include <violite.h>
#include <sys/stat.h>
#include <signal.h>
#include <time.h>
#ifdef	 HAVE_PWD_H
#include <pwd.h>
#endif
#if !defined(MSDOS) && !defined(__WIN__)
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <netdb.h>
#ifdef HAVE_SELECT_H
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#include <select.h>
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#endif
#ifdef HAVE_SYS_SELECT_H
#include <sys/select.h>
#endif
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#endif /* !defined(MSDOS) && !defined(__WIN__) */
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#ifdef HAVE_POLL
#include <sys/poll.h>
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#endif
#ifdef HAVE_SYS_UN_H
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#include <sys/un.h>
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#endif
#if defined(THREAD) && !defined(__WIN__)
#include <my_pthread.h>				/* because of signal()	*/
#endif
#ifndef INADDR_NONE
#define INADDR_NONE	-1
#endif

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#include <sql_common.h>
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#include "client_settings.h"
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#undef net_buffer_length
#undef max_allowed_packet
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ulong 		net_buffer_length=8192;
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ulong		max_allowed_packet= 1024L*1024L*1024L;
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ulong		net_read_timeout=  CLIENT_NET_READ_TIMEOUT;
ulong		net_write_timeout= CLIENT_NET_WRITE_TIMEOUT;
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#ifdef EMBEDDED_LIBRARY
#undef net_flush
my_bool	net_flush(NET *net);
#endif

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#if defined(MSDOS) || defined(__WIN__)
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/* socket_errno is defined in my_global.h for all platforms */
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#define perror(A)
#else
#include <errno.h>
#define SOCKET_ERROR -1
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#endif /* __WIN__ */
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/*
  If allowed through some configuration, then this needs to
  be changed
*/
#define MAX_LONG_DATA_LENGTH 8192
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#define unsigned_field(A) ((A)->flags & UNSIGNED_FLAG)

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static void append_wild(char *to,char *end,const char *wild);
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sig_handler my_pipe_sig_handler(int sig);
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static my_bool mysql_client_init= 0;
static my_bool org_my_init_done= 0;

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/*
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  Initialize the MySQL client library
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  SYNOPSIS
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    mysql_server_init()
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  NOTES
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    Should be called before doing any other calls to the MySQL
    client library to initialize thread specific variables etc.
    It's called by mysql_init() to ensure that things will work for
    old not threaded applications that doesn't call mysql_server_init()
    directly.
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  RETURN
    0  ok
    1  could not initialize environment (out of memory or thread keys)
*/

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int STDCALL mysql_server_init(int argc __attribute__((unused)),
			      char **argv __attribute__((unused)),
			      char **groups __attribute__((unused)))
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{
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  int result= 0;
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  if (!mysql_client_init)
  {
    mysql_client_init=1;
    org_my_init_done=my_init_done;
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    if (my_init())				/* Will init threads */
      return 1;
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    init_client_errs();
    if (!mysql_port)
    {
      mysql_port = MYSQL_PORT;
#ifndef MSDOS
      {
	struct servent *serv_ptr;
	char	*env;
	if ((serv_ptr = getservbyname("mysql", "tcp")))
	  mysql_port = (uint) ntohs((ushort) serv_ptr->s_port);
	if ((env = getenv("MYSQL_TCP_PORT")))
	  mysql_port =(uint) atoi(env);
      }
#endif
    }
    if (!mysql_unix_port)
    {
      char *env;
#ifdef __WIN__
      mysql_unix_port = (char*) MYSQL_NAMEDPIPE;
#else
      mysql_unix_port = (char*) MYSQL_UNIX_ADDR;
#endif
      if ((env = getenv("MYSQL_UNIX_PORT")))
	mysql_unix_port = env;
    }
    mysql_debug(NullS);
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#if defined(SIGPIPE) && !defined(__WIN__) && !defined(__NETWARE__)
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    (void) signal(SIGPIPE, SIG_IGN);
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#endif
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#ifdef EMBEDDED_LIBRARY
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    if (argc > -1)
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       result= init_embedded_server(argc, argv, groups);
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#endif
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  }
#ifdef THREAD
  else
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    result= (int)my_thread_init();         /* Init if new thread */
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#endif
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  return result;
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}
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void STDCALL mysql_server_end()
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{
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#ifdef EMBEDDED_LIBRARY
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  end_embedded_server();
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#endif
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  /* If library called my_init(), free memory allocated by it */
  if (!org_my_init_done)
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  {
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    my_end(0);
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  /* Remove TRACING, if enabled by mysql_debug() */
    DBUG_POP();
  }
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  else
    mysql_thread_end();
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  finish_client_errs();
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  free_charsets();
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  mysql_client_init= org_my_init_done= 0;
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#ifdef EMBEDDED_SERVER
  if (stderror_file)
  {
    fclose(stderror_file);
    stderror_file= 0;
  }
#endif
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}
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static MYSQL_PARAMETERS mysql_internal_parameters=
{&max_allowed_packet, &net_buffer_length};

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MYSQL_PARAMETERS *STDCALL mysql_get_parameters(void)
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{
  return &mysql_internal_parameters;
}

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my_bool STDCALL mysql_thread_init()
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{
#ifdef THREAD
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  return my_thread_init();
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#else
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  return 0;
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#endif
}

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void STDCALL mysql_thread_end()
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{
#ifdef THREAD
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  my_thread_end();
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#endif
}

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/*
  Let the user specify that we don't want SIGPIPE;  This doesn't however work
  with threaded applications as we can have multiple read in progress.
*/
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static MYSQL* spawn_init(MYSQL* parent, const char* host,
			 unsigned int port,
			 const char* user,
			 const char* passwd);

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/*
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  Expand wildcard to a sql string
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*/

static void
append_wild(char *to, char *end, const char *wild)
{
  end-=5;					/* Some extra */
  if (wild && wild[0])
  {
    to=strmov(to," like '");
    while (*wild && to < end)
    {
      if (*wild == '\\' || *wild == '\'')
	*to++='\\';
      *to++= *wild++;
    }
    if (*wild)					/* Too small buffer */
      *to++='%';				/* Nicer this way */
    to[0]='\'';
    to[1]=0;
  }
}


/**************************************************************************
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  Init debugging if MYSQL_DEBUG environment variable is found
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**************************************************************************/

void STDCALL
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mysql_debug(const char *debug __attribute__((unused)))
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{
#ifndef DBUG_OFF
  char	*env;
  if (debug)
  {
    DBUG_PUSH(debug);
  }
  else if ((env = getenv("MYSQL_DEBUG")))
  {
    DBUG_PUSH(env);
#if !defined(_WINVER) && !defined(WINVER)
    puts("\n-------------------------------------------------------");
    puts("MYSQL_DEBUG found. libmysql started with the following:");
    puts(env);
    puts("-------------------------------------------------------\n");
#else
    {
      char buff[80];
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      buff[sizeof(buff)-1]= 0;
      strxnmov(buff,sizeof(buff)-1,"libmysql: ", env, NullS);
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      MessageBox((HWND) 0,"Debugging variable MYSQL_DEBUG used",buff,MB_OK);
    }
#endif
  }
#endif
}


/**************************************************************************
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  Close the server connection if we get a SIGPIPE
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   ARGSUSED
**************************************************************************/

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sig_handler
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my_pipe_sig_handler(int sig __attribute__((unused)))
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{
  DBUG_PRINT("info",("Hit by signal %d",sig));
#ifdef DONT_REMEMBER_SIGNAL
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  (void) signal(SIGPIPE, my_pipe_sig_handler);
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#endif
}

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/* perform query on master */
my_bool STDCALL mysql_master_query(MYSQL *mysql, const char *q,
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				   unsigned long length)
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{
  DBUG_ENTER("mysql_master_query");
  if (mysql_master_send_query(mysql, q, length))
    DBUG_RETURN(1);
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  DBUG_RETURN((*mysql->methods->read_query_result)(mysql));
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}
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my_bool STDCALL mysql_master_send_query(MYSQL *mysql, const char *q,
					unsigned long length)
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{
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  MYSQL *master = mysql->master;
  DBUG_ENTER("mysql_master_send_query");
  if (!master->net.vio && !mysql_real_connect(master,0,0,0,0,0,0,0))
    DBUG_RETURN(1);
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  master->reconnect= 1;
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  mysql->last_used_con = master;
  DBUG_RETURN(simple_command(master, COM_QUERY, q, length, 1));
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}


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/* perform query on slave */
my_bool STDCALL mysql_slave_query(MYSQL *mysql, const char *q,
				  unsigned long length)
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{
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  DBUG_ENTER("mysql_slave_query");
  if (mysql_slave_send_query(mysql, q, length))
    DBUG_RETURN(1);
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  DBUG_RETURN((*mysql->methods->read_query_result)(mysql));
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}


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my_bool STDCALL mysql_slave_send_query(MYSQL *mysql, const char *q,
				   unsigned long length)
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{
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  MYSQL* last_used_slave, *slave_to_use = 0;
  DBUG_ENTER("mysql_slave_send_query");
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  if ((last_used_slave = mysql->last_used_slave))
    slave_to_use = last_used_slave->next_slave;
  else
    slave_to_use = mysql->next_slave;
  /*
    Next_slave is always safe to use - we have a circular list of slaves
    if there are no slaves, mysql->next_slave == mysql
  */
  mysql->last_used_con = mysql->last_used_slave = slave_to_use;
  if (!slave_to_use->net.vio && !mysql_real_connect(slave_to_use, 0,0,0,
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						    0,0,0,0))
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    DBUG_RETURN(1);
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  slave_to_use->reconnect= 1;
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  DBUG_RETURN(simple_command(slave_to_use, COM_QUERY, q, length, 1));
}
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/* enable/disable parsing of all queries to decide
   if they go on master or slave */
void STDCALL mysql_enable_rpl_parse(MYSQL* mysql)
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{
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  mysql->options.rpl_parse = 1;
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}

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void STDCALL mysql_disable_rpl_parse(MYSQL* mysql)
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{
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  mysql->options.rpl_parse = 0;
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}

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/* get the value of the parse flag */
int STDCALL mysql_rpl_parse_enabled(MYSQL* mysql)
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{
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  return mysql->options.rpl_parse;
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}

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/*  enable/disable reads from master */
void STDCALL mysql_enable_reads_from_master(MYSQL* mysql)
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{
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  mysql->options.no_master_reads = 0;
}
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void STDCALL mysql_disable_reads_from_master(MYSQL* mysql)
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{
  mysql->options.no_master_reads = 1;
}

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/* get the value of the master read flag */
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my_bool STDCALL mysql_reads_from_master_enabled(MYSQL* mysql)
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{
  return !(mysql->options.no_master_reads);
}

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/*
  We may get an error while doing replication internals.
  In this case, we add a special explanation to the original
  error
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*/
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static void expand_error(MYSQL* mysql, int error)
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{
  char tmp[MYSQL_ERRMSG_SIZE];
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  char *p;
  uint err_length;
  strmake(tmp, mysql->net.last_error, MYSQL_ERRMSG_SIZE-1);
  p = strmake(mysql->net.last_error, ER(error), MYSQL_ERRMSG_SIZE-1);
  err_length= (uint) (p - mysql->net.last_error);
  strmake(p, tmp, MYSQL_ERRMSG_SIZE-1 - err_length);
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  mysql->net.last_errno = error;
}

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/*
  This function assumes we have just called SHOW SLAVE STATUS and have
  read the given result and row
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*/
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static my_bool get_master(MYSQL* mysql, MYSQL_RES* res, MYSQL_ROW row)
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{
  MYSQL* master;
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  DBUG_ENTER("get_master");
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  if (mysql_num_fields(res) < 3)
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    DBUG_RETURN(1); /* safety */
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  /* use the same username and password as the original connection */
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  if (!(master = spawn_init(mysql, row[0], atoi(row[2]), 0, 0)))
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    DBUG_RETURN(1);
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  mysql->master = master;
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  DBUG_RETURN(0);
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}

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/*
  Assuming we already know that mysql points to a master connection,
  retrieve all the slaves
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*/
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static my_bool get_slaves_from_master(MYSQL* mysql)
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{
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  MYSQL_RES* res = 0;
  MYSQL_ROW row;
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  my_bool error = 1;
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  int has_auth_info;
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  int port_ind;
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  DBUG_ENTER("get_slaves_from_master");
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  if (!mysql->net.vio && !mysql_real_connect(mysql,0,0,0,0,0,0,0))
  {
    expand_error(mysql, CR_PROBE_MASTER_CONNECT);
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    DBUG_RETURN(1);
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  }
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  mysql->reconnect= 1;
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  if (mysql_query(mysql, "SHOW SLAVE HOSTS") ||
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      !(res = mysql_store_result(mysql)))
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  {
    expand_error(mysql, CR_PROBE_SLAVE_HOSTS);
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    DBUG_RETURN(1);
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  }

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  switch (mysql_num_fields(res)) {
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  case 5:
    has_auth_info = 0;
    port_ind=2;
    break;
  case 7:
    has_auth_info = 1;
    port_ind=4;
    break;
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  default:
    goto err;
  }

  while ((row = mysql_fetch_row(res)))
  {
    MYSQL* slave;
    const char* tmp_user, *tmp_pass;

    if (has_auth_info)
    {
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      tmp_user = row[2];
      tmp_pass = row[3];
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    }
    else
    {
      tmp_user = mysql->user;
      tmp_pass = mysql->passwd;
    }

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    if (!(slave = spawn_init(mysql, row[1], atoi(row[port_ind]),
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			     tmp_user, tmp_pass)))
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      goto err;
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    /* Now add slave into the circular linked list */
    slave->next_slave = mysql->next_slave;
    mysql->next_slave = slave;
  }
  error = 0;
err:
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  if (res)
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    mysql_free_result(res);
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  DBUG_RETURN(error);
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}

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my_bool STDCALL mysql_rpl_probe(MYSQL* mysql)
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{
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  MYSQL_RES *res= 0;
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  MYSQL_ROW row;
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  my_bool error= 1;
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  DBUG_ENTER("mysql_rpl_probe");

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  /*
    First determine the replication role of the server we connected to
    the most reliable way to do this is to run SHOW SLAVE STATUS and see
    if we have a non-empty master host. This is still not fool-proof -
    it is not a sin to have a master that has a dormant slave thread with
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    a non-empty master host. However, it is more reliable to check
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    for empty master than whether the slave thread is actually running
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  */
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  if (mysql_query(mysql, "SHOW SLAVE STATUS") ||
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      !(res = mysql_store_result(mysql)))
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  {
    expand_error(mysql, CR_PROBE_SLAVE_STATUS);
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    DBUG_RETURN(1);
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  }
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  row= mysql_fetch_row(res);
  /*
    Check master host for emptiness/NULL
    For MySQL 4.0 it's enough to check for row[0]
  */
  if (row && row[0] && *(row[0]))
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  {
    /* this is a slave, ask it for the master */
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    if (get_master(mysql, res, row) || get_slaves_from_master(mysql))
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      goto err;
  }
  else
  {
    mysql->master = mysql;
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    if (get_slaves_from_master(mysql))
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      goto err;
  }

  error = 0;
err:
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  if (res)
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    mysql_free_result(res);
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  DBUG_RETURN(error);
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}


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/*
  Make a not so fool-proof decision on where the query should go, to
  the master or the slave. Ideally the user should always make this
  decision himself with mysql_master_query() or mysql_slave_query().
  However, to be able to more easily port the old code, we support the
  option of an educated guess - this should work for most applications,
  however, it may make the wrong decision in some particular cases. If
  that happens, the user would have to change the code to call
  mysql_master_query() or mysql_slave_query() explicitly in the place
  where we have made the wrong decision
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*/
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enum mysql_rpl_type
STDCALL mysql_rpl_query_type(const char* q, int len)
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{
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  const char *q_end= q + len;
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  for (; q < q_end; ++q)
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  {
    char c;
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    if (my_isalpha(&my_charset_latin1, (c= *q)))
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    {
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      switch (my_tolower(&my_charset_latin1,c)) {
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      case 'i':  /* insert */
      case 'u':  /* update or unlock tables */
      case 'l':  /* lock tables or load data infile */
      case 'd':  /* drop or delete */
      case 'a':  /* alter */
	return MYSQL_RPL_MASTER;
      case 'c':  /* create or check */
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	return my_tolower(&my_charset_latin1,q[1]) == 'h' ? MYSQL_RPL_ADMIN :
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	  MYSQL_RPL_MASTER;
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      case 's': /* select or show */
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	return my_tolower(&my_charset_latin1,q[1]) == 'h' ? MYSQL_RPL_ADMIN :
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	  MYSQL_RPL_SLAVE;
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      case 'f': /* flush */
      case 'r': /* repair */
      case 'g': /* grant */
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	return MYSQL_RPL_ADMIN;
      default:
	return MYSQL_RPL_SLAVE;
      }
    }
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  }
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  return MYSQL_RPL_MASTER;		/* By default, send to master */
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}


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/**************************************************************************
  Connect to sql server
  If host == 0 then use localhost
**************************************************************************/
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#ifdef USE_OLD_FUNCTIONS
MYSQL * STDCALL
mysql_connect(MYSQL *mysql,const char *host,
	      const char *user, const char *passwd)
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{
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  MYSQL *res;
  mysql=mysql_init(mysql);			/* Make it thread safe */
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  {
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    DBUG_ENTER("mysql_connect");
    if (!(res=mysql_real_connect(mysql,host,user,passwd,NullS,0,NullS,0)))
    {
      if (mysql->free_me)
	my_free((gptr) mysql,MYF(0));
    }
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    mysql->reconnect= 1;
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    DBUG_RETURN(res);
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  }
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}
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#endif
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/**************************************************************************
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  Change user and database
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**************************************************************************/
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int cli_read_change_user_result(MYSQL *mysql, char *buff, const char *passwd)
{
  NET *net= &mysql->net;
  ulong pkt_length;

  pkt_length= net_safe_read(mysql);
  
  if (pkt_length == packet_error)
    return 1;

  if (pkt_length == 1 && net->read_pos[0] == 254 &&
      mysql->server_capabilities & CLIENT_SECURE_CONNECTION)
  {
    /*
      By sending this very specific reply server asks us to send scrambled
      password in old format. The reply contains scramble_323.
    */
    scramble_323(buff, mysql->scramble, passwd);
    if (my_net_write(net, buff, SCRAMBLE_LENGTH_323 + 1) || net_flush(net))
    {
      net->last_errno= CR_SERVER_LOST;
      strmov(net->sqlstate, unknown_sqlstate);
      strmov(net->last_error,ER(net->last_errno));
      return 1;
    }
    /* Read what server thinks about out new auth message report */
    if (net_safe_read(mysql) == packet_error)
      return 1;
  }
  return 0;
}
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my_bool	STDCALL mysql_change_user(MYSQL *mysql, const char *user,
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				  const char *passwd, const char *db)
{
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  char buff[512],*end=buff;
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  int rc;
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  DBUG_ENTER("mysql_change_user");

  if (!user)
    user="";
  if (!passwd)
    passwd="";
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  /* Store user into the buffer */
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  end=strmov(end,user)+1;
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  /* write scrambled password according to server capabilities */
  if (passwd[0])
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  {
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    if (mysql->server_capabilities & CLIENT_SECURE_CONNECTION)
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    {
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      *end++= SCRAMBLE_LENGTH;
      scramble(end, mysql->scramble, passwd);
      end+= SCRAMBLE_LENGTH;
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    }
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    else
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    {
      scramble_323(end, mysql->scramble, passwd);
      end+= SCRAMBLE_LENGTH_323 + 1;
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    }
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  }
  else
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    *end++= '\0';                               /* empty password */
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  /* Add database if needed */
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  end= strmov(end, db ? db : "") + 1;
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  /* Write authentication package */
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  simple_command(mysql,COM_CHANGE_USER, buff,(ulong) (end-buff),1);
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  rc= (*mysql->methods->read_change_user_result)(mysql, buff, passwd);

  /*
    The server will close all statements no matter was the attempt
    to change user successful or not.
  */
  mysql_detach_stmt_list(&mysql->stmts);
  if (rc == 0)
  {
    /* Free old connect information */
    my_free(mysql->user,MYF(MY_ALLOW_ZERO_PTR));
    my_free(mysql->passwd,MYF(MY_ALLOW_ZERO_PTR));
    my_free(mysql->db,MYF(MY_ALLOW_ZERO_PTR));

    /* alloc new connect information */
    mysql->user=  my_strdup(user,MYF(MY_WME));
    mysql->passwd=my_strdup(passwd,MYF(MY_WME));
    mysql->db=    db ? my_strdup(db,MYF(MY_WME)) : 0;
  }
  DBUG_RETURN(rc);
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}

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#if defined(HAVE_GETPWUID) && defined(NO_GETPWUID_DECL)
struct passwd *getpwuid(uid_t);
char* getlogin(void);
#endif

#if defined(__NETWARE__)
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/* Default to value of USER on NetWare, if unset use "UNKNOWN_USER" */
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void read_user_name(char *name)
{
  char *str=getenv("USER");
  strmake(name, str ? str : "UNKNOWN_USER", USERNAME_LENGTH);
}

#elif !defined(MSDOS) && ! defined(VMS) && !defined(__WIN__) && !defined(OS2)

void read_user_name(char *name)
{
  DBUG_ENTER("read_user_name");
  if (geteuid() == 0)
    (void) strmov(name,"root");		/* allow use of surun */
  else
  {
#ifdef HAVE_GETPWUID
    struct passwd *skr;
    const char *str;
    if ((str=getlogin()) == NULL)
    {
      if ((skr=getpwuid(geteuid())) != NULL)
	str=skr->pw_name;
      else if (!(str=getenv("USER")) && !(str=getenv("LOGNAME")) &&
	       !(str=getenv("LOGIN")))
	str="UNKNOWN_USER";
    }
    (void) strmake(name,str,USERNAME_LENGTH);
#elif HAVE_CUSERID
    (void) cuserid(name);
#else
    strmov(name,"UNKNOWN_USER");
#endif
  }
  DBUG_VOID_RETURN;
}

#else /* If MSDOS || VMS */

void read_user_name(char *name)
{
  char *str=getenv("USER");		/* ODBC will send user variable */
  strmake(name,str ? str : "ODBC", USERNAME_LENGTH);
}

#endif

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my_bool handle_local_infile(MYSQL *mysql, const char *net_filename)
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{
  my_bool result= 1;
  uint packet_length=MY_ALIGN(mysql->net.max_packet-16,IO_SIZE);
  NET *net= &mysql->net;
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  int readcount;
  void *li_ptr;          /* pass state to local_infile functions */
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  char *buf;		/* buffer to be filled by local_infile_read */
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  struct st_mysql_options *options= &mysql->options;
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  DBUG_ENTER("handle_local_infile");

  /* check that we've got valid callback functions */
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  if (!(options->local_infile_init &&
	options->local_infile_read &&
	options->local_infile_end &&
	options->local_infile_error))
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  {
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    /* if any of the functions is invalid, set the default */
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    mysql_set_local_infile_default(mysql);
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  }

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  /* copy filename into local memory and allocate read buffer */
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  if (!(buf=my_malloc(packet_length, MYF(0))))
  {
    strmov(net->sqlstate, unknown_sqlstate);
    strmov(net->last_error, ER(net->last_errno=CR_OUT_OF_MEMORY));
    DBUG_RETURN(1);
  }
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  /* initialize local infile (open file, usually) */
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  if ((*options->local_infile_init)(&li_ptr, net_filename,
    options->local_infile_userdata))
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  {
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    VOID(my_net_write(net,"",0));               /* Server needs one packet */
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    net_flush(net);
    strmov(net->sqlstate, unknown_sqlstate);
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    net->last_errno= (*options->local_infile_error)(li_ptr,
						    net->last_error,
						    sizeof(net->last_error)-1);
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    goto err;
  }

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  /* read blocks of data from local infile callback */
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  while ((readcount =
	  (*options->local_infile_read)(li_ptr, buf,
					packet_length)) > 0)
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  {
    if (my_net_write(net,buf,readcount))
    {
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      DBUG_PRINT("error",
		 ("Lost connection to MySQL server during LOAD DATA of local file"));
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      strmov(net->sqlstate, unknown_sqlstate);
      net->last_errno=CR_SERVER_LOST;
      strmov(net->last_error,ER(net->last_errno));
      goto err;
    }
  }
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  /* Send empty packet to mark end of file */
  if (my_net_write(net,"",0) || net_flush(net))
  {
    strmov(net->sqlstate, unknown_sqlstate);
    net->last_errno=CR_SERVER_LOST;
    sprintf(net->last_error,ER(net->last_errno),errno);
    goto err;
  }
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  if (readcount < 0)
  {
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    net->last_errno= (*options->local_infile_error)(li_ptr,
						    net->last_error,
						    sizeof(net->last_error)-1);
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    goto err;
  }
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  result=0;					/* Ok */

err:
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  /* free up memory allocated with _init, usually */
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  (*options->local_infile_end)(li_ptr);
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  my_free(buf, MYF(0));
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  DBUG_RETURN(result);
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}


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/****************************************************************************
  Default handlers for LOAD LOCAL INFILE
****************************************************************************/

typedef struct st_default_local_infile
{
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  int fd;
  int error_num;
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  const char *filename;
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  char error_msg[LOCAL_INFILE_ERROR_LEN];
} default_local_infile_data;


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/*
  Open file for LOAD LOCAL INFILE

  SYNOPSIS
    default_local_infile_init()
    ptr			Store pointer to internal data here
    filename		File name to open. This may be in unix format !


  NOTES
    Even if this function returns an error, the load data interface
    guarantees that default_local_infile_end() is called.

  RETURN
    0	ok
    1	error
*/

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static int default_local_infile_init(void **ptr, const char *filename,
             void *userdata __attribute__ ((unused)))
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{
  default_local_infile_data *data;
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  char tmp_name[FN_REFLEN];
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  if (!(*ptr= data= ((default_local_infile_data *)
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		     my_malloc(sizeof(default_local_infile_data),  MYF(0)))))
    return 1; /* out of memory */
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  data->error_msg[0]= 0;
  data->error_num=    0;
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  data->filename= filename;
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  fn_format(tmp_name, filename, "", "", MY_UNPACK_FILENAME);
  if ((data->fd = my_open(tmp_name, O_RDONLY, MYF(0))) < 0)
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  {
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    data->error_num= my_errno;
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    my_snprintf(data->error_msg, sizeof(data->error_msg)-1,
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                EE(EE_FILENOTFOUND), tmp_name, data->error_num);
    return 1;
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  }
  return 0; /* ok */
}


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/*
  Read data for LOAD LOCAL INFILE

  SYNOPSIS
    default_local_infile_read()
    ptr			Points to handle allocated by _init
    buf			Read data here
    buf_len		Ammount of data to read

  RETURN
    > 0		number of bytes read
    == 0	End of data
    < 0		Error
*/

static int default_local_infile_read(void *ptr, char *buf, uint buf_len)
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{
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  int count;
  default_local_infile_data*data = (default_local_infile_data *) ptr;
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  if ((count= (int) my_read(data->fd, (byte *) buf, buf_len, MYF(0))) < 0)
  {
    data->error_num= EE_READ; /* the errmsg for not entire file read */
    my_snprintf(data->error_msg, sizeof(data->error_msg)-1,
		EE(EE_READ),
		data->filename, my_errno);
  }
  return count;
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}


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/*
  Read data for LOAD LOCAL INFILE

  SYNOPSIS
    default_local_infile_end()
    ptr			Points to handle allocated by _init
			May be NULL if _init failed!

  RETURN
*/

static void default_local_infile_end(void *ptr)
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{
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  default_local_infile_data *data= (default_local_infile_data *) ptr;
  if (data)					/* If not error on open */
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  {
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    if (data->fd >= 0)
      my_close(data->fd, MYF(MY_WME));
    my_free(ptr, MYF(MY_WME));
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  }
}


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/*
  Return error from LOAD LOCAL INFILE

  SYNOPSIS
    default_local_infile_end()
    ptr			Points to handle allocated by _init
			May be NULL if _init failed!
    error_msg		Store error text here
    error_msg_len	Max lenght of error_msg

  RETURN
    error message number
*/

static int
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default_local_infile_error(void *ptr, char *error_msg, uint error_msg_len)
{
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  default_local_infile_data *data = (default_local_infile_data *) ptr;
  if (data)					/* If not error on open */
  {
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    strmake(error_msg, data->error_msg, error_msg_len);
    return data->error_num;
  }
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  /* This can only happen if we got error on malloc of handle */
  strmov(error_msg, ER(CR_OUT_OF_MEMORY));
  return CR_OUT_OF_MEMORY;
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}


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void
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mysql_set_local_infile_handler(MYSQL *mysql,
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                               int (*local_infile_init)(void **, const char *,
                               void *),
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                               int (*local_infile_read)(void *, char *, uint),
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                               void (*local_infile_end)(void *),
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                               int (*local_infile_error)(void *, char *, uint),
                               void *userdata)
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{
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  mysql->options.local_infile_init=  local_infile_init;
  mysql->options.local_infile_read=  local_infile_read;
  mysql->options.local_infile_end=   local_infile_end;
  mysql->options.local_infile_error= local_infile_error;
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  mysql->options.local_infile_userdata = userdata;
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}


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void mysql_set_local_infile_default(MYSQL *mysql)
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{
  mysql->options.local_infile_init=  default_local_infile_init;
  mysql->options.local_infile_read=  default_local_infile_read;
  mysql->options.local_infile_end=   default_local_infile_end;
  mysql->options.local_infile_error= default_local_infile_error;
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}


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/**************************************************************************
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  Do a query. If query returned rows, free old rows.
  Read data by mysql_store_result or by repeat call of mysql_fetch_row
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**************************************************************************/

int STDCALL
mysql_query(MYSQL *mysql, const char *query)
{
  return mysql_real_query(mysql,query, (uint) strlen(query));
}

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static MYSQL* spawn_init(MYSQL* parent, const char* host,
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			 unsigned int port, const char* user,
			 const char* passwd)
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{
  MYSQL* child;
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  DBUG_ENTER("spawn_init");
  if (!(child= mysql_init(0)))
    DBUG_RETURN(0);

  child->options.user= my_strdup((user) ? user :
				 (parent->user ? parent->user :
				  parent->options.user), MYF(0));
  child->options.password= my_strdup((passwd) ? passwd :
				     (parent->passwd ?
				      parent->passwd :
				      parent->options.password), MYF(0));
  child->options.port= port;
  child->options.host= my_strdup((host) ? host :
				 (parent->host ?
				  parent->host :
				  parent->options.host), MYF(0));
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  if (parent->db)
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    child->options.db= my_strdup(parent->db, MYF(0));
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  else if (parent->options.db)
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    child->options.db= my_strdup(parent->options.db, MYF(0));
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  /*
    rpl_pivot is set to 1 in mysql_init();  Reset it as we are not doing
    replication here
  */
  child->rpl_pivot= 0;
  DBUG_RETURN(child);
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}


int
STDCALL mysql_set_master(MYSQL* mysql, const char* host,
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			 unsigned int port, const char* user,
			 const char* passwd)
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{
  if (mysql->master != mysql && !mysql->master->rpl_pivot)
    mysql_close(mysql->master);
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  if (!(mysql->master = spawn_init(mysql, host, port, user, passwd)))
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    return 1;
  return 0;
}

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int
STDCALL mysql_add_slave(MYSQL* mysql, const char* host,
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			unsigned int port,
			const char* user,
			const char* passwd)
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{
  MYSQL* slave;
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  if (!(slave = spawn_init(mysql, host, port, user, passwd)))
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    return 1;
  slave->next_slave = mysql->next_slave;
  mysql->next_slave = slave;
  return 0;
}

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/**************************************************************************
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  Return next field of the query results
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**************************************************************************/

MYSQL_FIELD * STDCALL
mysql_fetch_field(MYSQL_RES *result)
{
  if (result->current_field >= result->field_count)
    return(NULL);
  return &result->fields[result->current_field++];
}

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/**************************************************************************
  Move to a specific row and column
**************************************************************************/

void STDCALL
mysql_data_seek(MYSQL_RES *result, my_ulonglong row)
{
  MYSQL_ROWS	*tmp=0;
  DBUG_PRINT("info",("mysql_data_seek(%ld)",(long) row));
  if (result->data)
    for (tmp=result->data->data; row-- && tmp ; tmp = tmp->next) ;
  result->current_row=0;
  result->data_cursor = tmp;
}


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/*************************************************************************
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  put the row or field cursor one a position one got from mysql_row_tell()
  This doesn't restore any data. The next mysql_fetch_row or
  mysql_fetch_field will return the next row or field after the last used
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*************************************************************************/

MYSQL_ROW_OFFSET STDCALL
mysql_row_seek(MYSQL_RES *result, MYSQL_ROW_OFFSET row)
{
  MYSQL_ROW_OFFSET return_value=result->data_cursor;
  result->current_row= 0;
  result->data_cursor= row;
  return return_value;
}


MYSQL_FIELD_OFFSET STDCALL
mysql_field_seek(MYSQL_RES *result, MYSQL_FIELD_OFFSET field_offset)
{
  MYSQL_FIELD_OFFSET return_value=result->current_field;
  result->current_field=field_offset;
  return return_value;
}

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/*****************************************************************************
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  List all databases
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*****************************************************************************/

MYSQL_RES * STDCALL
mysql_list_dbs(MYSQL *mysql, const char *wild)
{
  char buff[255];
  DBUG_ENTER("mysql_list_dbs");

  append_wild(strmov(buff,"show databases"),buff+sizeof(buff),wild);
  if (mysql_query(mysql,buff))
    DBUG_RETURN(0);
  DBUG_RETURN (mysql_store_result(mysql));
}


/*****************************************************************************
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  List all tables in a database
  If wild is given then only the tables matching wild is returned
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*****************************************************************************/

MYSQL_RES * STDCALL
mysql_list_tables(MYSQL *mysql, const char *wild)
{
  char buff[255];
  DBUG_ENTER("mysql_list_tables");

  append_wild(strmov(buff,"show tables"),buff+sizeof(buff),wild);
  if (mysql_query(mysql,buff))
    DBUG_RETURN(0);
  DBUG_RETURN (mysql_store_result(mysql));
}

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MYSQL_FIELD *cli_list_fields(MYSQL *mysql)
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{
  MYSQL_DATA *query;
  if (!(query= cli_read_rows(mysql,(MYSQL_FIELD*) 0, 
			     protocol_41(mysql) ? 8 : 6)))
    return NULL;

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  mysql->field_count= (uint) query->rows;
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  return unpack_fields(query,&mysql->field_alloc,
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		       mysql->field_count, 1, mysql->server_capabilities);
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}


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/**************************************************************************
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  List all fields in a table
  If wild is given then only the fields matching wild is returned
  Instead of this use query:
  show fields in 'table' like "wild"
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**************************************************************************/

MYSQL_RES * STDCALL
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mysql_list_fields(MYSQL *mysql, const char *table, const char *wild)
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{
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  MYSQL_RES   *result;
  MYSQL_FIELD *fields;
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  char	     buff[257],*end;
  DBUG_ENTER("mysql_list_fields");
  DBUG_PRINT("enter",("table: '%s'  wild: '%s'",table,wild ? wild : ""));

  end=strmake(strmake(buff, table,128)+1,wild ? wild : "",128);
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  free_old_query(mysql);
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  if (simple_command(mysql,COM_FIELD_LIST,buff,(ulong) (end-buff),1) ||
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      !(fields= (*mysql->methods->list_fields)(mysql)))
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    DBUG_RETURN(NULL);

  if (!(result = (MYSQL_RES *) my_malloc(sizeof(MYSQL_RES),
					 MYF(MY_WME | MY_ZEROFILL))))
    DBUG_RETURN(NULL);
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  result->methods= mysql->methods;
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  result->field_alloc=mysql->field_alloc;
  mysql->fields=0;
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  result->field_count = mysql->field_count;
  result->fields= fields;
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  result->eof=1;
  DBUG_RETURN(result);
}

/* List all running processes (threads) in server */

MYSQL_RES * STDCALL
mysql_list_processes(MYSQL *mysql)
{
  MYSQL_DATA *fields;
  uint field_count;
  uchar *pos;
  DBUG_ENTER("mysql_list_processes");

  LINT_INIT(fields);
  if (simple_command(mysql,COM_PROCESS_INFO,0,0,0))
    DBUG_RETURN(0);
  free_old_query(mysql);
  pos=(uchar*) mysql->net.read_pos;
  field_count=(uint) net_field_length(&pos);
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  if (!(fields = (*mysql->methods->read_rows)(mysql,(MYSQL_FIELD*) 0,
					      protocol_41(mysql) ? 7 : 5)))
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    DBUG_RETURN(NULL);
  if (!(mysql->fields=unpack_fields(fields,&mysql->field_alloc,field_count,0,
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				    mysql->server_capabilities)))
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    DBUG_RETURN(0);
  mysql->status=MYSQL_STATUS_GET_RESULT;
  mysql->field_count=field_count;
  DBUG_RETURN(mysql_store_result(mysql));
}

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#ifdef USE_OLD_FUNCTIONS
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int  STDCALL
mysql_create_db(MYSQL *mysql, const char *db)
{
  DBUG_ENTER("mysql_createdb");
  DBUG_PRINT("enter",("db: %s",db));
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  DBUG_RETURN(simple_command(mysql,COM_CREATE_DB,db, (ulong) strlen(db),0));
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}


int  STDCALL
mysql_drop_db(MYSQL *mysql, const char *db)
{
  DBUG_ENTER("mysql_drop_db");
  DBUG_PRINT("enter",("db: %s",db));
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  DBUG_RETURN(simple_command(mysql,COM_DROP_DB,db,(ulong) strlen(db),0));
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}
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#endif
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int STDCALL
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mysql_shutdown(MYSQL *mysql, enum mysql_enum_shutdown_level shutdown_level)
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{
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  uchar level[1];
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  DBUG_ENTER("mysql_shutdown");
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  level[0]= (uchar) shutdown_level;
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  DBUG_RETURN(simple_command(mysql, COM_SHUTDOWN, (char *)level, 1, 0));
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}


int STDCALL
mysql_refresh(MYSQL *mysql,uint options)
{
  uchar bits[1];
  DBUG_ENTER("mysql_refresh");
  bits[0]= (uchar) options;
  DBUG_RETURN(simple_command(mysql,COM_REFRESH,(char*) bits,1,0));
}

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int STDCALL
mysql_kill(MYSQL *mysql,ulong pid)
{
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  char buff[4];
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  DBUG_ENTER("mysql_kill");
  int4store(buff,pid);
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  DBUG_RETURN(simple_command(mysql,COM_PROCESS_KILL,buff,sizeof(buff),0));
}


int STDCALL
mysql_set_server_option(MYSQL *mysql, enum enum_mysql_set_option option)
{
  char buff[2];
  DBUG_ENTER("mysql_set_server_option");
  int2store(buff, (uint) option);
  DBUG_RETURN(simple_command(mysql, COM_SET_OPTION, buff, sizeof(buff), 0));
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}


int STDCALL
mysql_dump_debug_info(MYSQL *mysql)
{
  DBUG_ENTER("mysql_dump_debug_info");
  DBUG_RETURN(simple_command(mysql,COM_DEBUG,0,0,0));
}

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const char *cli_read_statistics(MYSQL *mysql)
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{
  mysql->net.read_pos[mysql->packet_length]=0;	/* End of stat string */
  if (!mysql->net.read_pos[0])
  {
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    strmov(mysql->net.sqlstate, unknown_sqlstate);
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    mysql->net.last_errno=CR_WRONG_HOST_INFO;
    strmov(mysql->net.last_error, ER(mysql->net.last_errno));
    return mysql->net.last_error;
  }
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  return (char*) mysql->net.read_pos;
}

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const char * STDCALL
mysql_stat(MYSQL *mysql)
{
  DBUG_ENTER("mysql_stat");
  if (simple_command(mysql,COM_STATISTICS,0,0,0))
    return mysql->net.last_error;
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  DBUG_RETURN((*mysql->methods->read_statistics)(mysql));
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}


int STDCALL
mysql_ping(MYSQL *mysql)
{
  DBUG_ENTER("mysql_ping");
  DBUG_RETURN(simple_command(mysql,COM_PING,0,0,0));
}


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const char * STDCALL
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mysql_get_server_info(MYSQL *mysql)
{
  return((char*) mysql->server_version);
}


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/*
  Get version number for server in a form easy to test on

  SYNOPSIS
    mysql_get_server_version()
    mysql		Connection

  EXAMPLE
    4.1.0-alfa ->  40100
  
  NOTES
    We will ensure that a newer server always has a bigger number.

  RETURN
   Signed number > 323000
*/

ulong STDCALL
mysql_get_server_version(MYSQL *mysql)
{
  uint major, minor, version;
  char *pos= mysql->server_version, *end_pos;
  major=   (uint) strtoul(pos, &end_pos, 10);	pos=end_pos+1;
  minor=   (uint) strtoul(pos, &end_pos, 10);	pos=end_pos+1;
  version= (uint) strtoul(pos, &end_pos, 10);
  return (ulong) major*10000L+(ulong) (minor*100+version);
}


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const char * STDCALL
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mysql_get_host_info(MYSQL *mysql)
{
  return(mysql->host_info);
}


uint STDCALL
mysql_get_proto_info(MYSQL *mysql)
{
  return (mysql->protocol_version);
}

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const char * STDCALL
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mysql_get_client_info(void)
{
  return (char*) MYSQL_SERVER_VERSION;
}

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ulong STDCALL mysql_get_client_version(void)
{
  return MYSQL_VERSION_ID;
}

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my_bool STDCALL mysql_eof(MYSQL_RES *res)
{
  return res->eof;
}

MYSQL_FIELD * STDCALL mysql_fetch_field_direct(MYSQL_RES *res,uint fieldnr)
{
  return &(res)->fields[fieldnr];
}

MYSQL_FIELD * STDCALL mysql_fetch_fields(MYSQL_RES *res)
{
  return (res)->fields;
}

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MYSQL_ROW_OFFSET STDCALL mysql_row_tell(MYSQL_RES *res)
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{
  return res->data_cursor;
}

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MYSQL_FIELD_OFFSET STDCALL mysql_field_tell(MYSQL_RES *res)
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{
  return (res)->current_field;
}

/* MYSQL */

unsigned int STDCALL mysql_field_count(MYSQL *mysql)
{
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  return mysql->last_used_con->field_count;
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}

my_ulonglong STDCALL mysql_affected_rows(MYSQL *mysql)
{
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  return mysql->last_used_con->affected_rows;
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}

my_ulonglong STDCALL mysql_insert_id(MYSQL *mysql)
{
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  return mysql->last_used_con->insert_id;
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}

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const char *STDCALL mysql_sqlstate(MYSQL *mysql)
{
  return mysql->net.sqlstate;
}

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uint STDCALL mysql_warning_count(MYSQL *mysql)
{
  return mysql->warning_count;
}

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const char *STDCALL mysql_info(MYSQL *mysql)
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{
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  return mysql->info;
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}

ulong STDCALL mysql_thread_id(MYSQL *mysql)
{
  return (mysql)->thread_id;
}

const char * STDCALL mysql_character_set_name(MYSQL *mysql)
{
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  return mysql->charset->csname;
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}

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void STDCALL mysql_get_character_set_info(MYSQL *mysql, MY_CHARSET_INFO *csinfo)
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{
  csinfo->number   = mysql->charset->number;
  csinfo->state    = mysql->charset->state;
  csinfo->csname   = mysql->charset->csname;
  csinfo->name     = mysql->charset->name;
  csinfo->comment  = mysql->charset->comment;
  csinfo->mbminlen = mysql->charset->mbminlen;
  csinfo->mbmaxlen = mysql->charset->mbmaxlen;

  if (mysql->options.charset_dir)
    csinfo->dir = mysql->options.charset_dir;
  else
    csinfo->dir = charsets_dir;
}
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uint STDCALL mysql_thread_safe(void)
{
#ifdef THREAD
  return 1;
#else
  return 0;
#endif
}

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my_bool STDCALL mysql_embedded(void)
{
#ifdef EMBEDDED_LIBRARY
  return 1;
#else
  return 0;
#endif
}

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/****************************************************************************
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  Some support functions
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****************************************************************************/

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/*
  Functions called my my_net_init() to set some application specific variables
*/

void my_net_local_init(NET *net)
{
  net->max_packet=   (uint) net_buffer_length;
  net->read_timeout= (uint) net_read_timeout;
  net->write_timeout=(uint) net_write_timeout;
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  net->retry_count=  1;
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  net->max_packet_size= max(net_buffer_length, max_allowed_packet);
}

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/*
  This function is used to create HEX string that you
  can use in a SQL statement in of the either ways:
    INSERT INTO blob_column VALUES (0xAABBCC);  (any MySQL version)
    INSERT INTO blob_column VALUES (X'AABBCC'); (4.1 and higher)
  
  The string in "from" is encoded to a HEX string.
  The result is placed in "to" and a terminating null byte is appended.
  
  The string pointed to by "from" must be "length" bytes long.
  You must allocate the "to" buffer to be at least length*2+1 bytes long.
  Each character needs two bytes, and you need room for the terminating
  null byte. When mysql_hex_string() returns, the contents of "to" will
  be a null-terminated string. The return value is the length of the
  encoded string, not including the terminating null character.

  The return value does not contain any leading 0x or a leading X' and
  trailing '. The caller must supply whichever of those is desired.
*/

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ulong STDCALL
mysql_hex_string(char *to, const char *from, ulong length)
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{
  char *to0= to;
  const char *end;
            
  for (end= from + length; from < end; from++)
  {
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    *to++= _dig_vec_upper[((unsigned char) *from) >> 4];
    *to++= _dig_vec_upper[((unsigned char) *from) & 0x0F];
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  }
  *to= '\0';
  return (ulong) (to-to0);
}

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/*
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  Add escape characters to a string (blob?) to make it suitable for a insert
  to should at least have place for length*2+1 chars
  Returns the length of the to string
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*/

ulong STDCALL
mysql_escape_string(char *to,const char *from,ulong length)
{
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  return escape_string_for_mysql(default_charset_info, to, 0, from, length);
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}

ulong STDCALL
mysql_real_escape_string(MYSQL *mysql, char *to,const char *from,
			 ulong length)
{
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  if (mysql->server_status & SERVER_STATUS_NO_BACKSLASH_ESCAPES)
    return escape_quotes_for_mysql(mysql->charset, to, 0, from, length);
1604
  return escape_string_for_mysql(mysql->charset, to, 0, from, length);
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}


char * STDCALL
mysql_odbc_escape_string(MYSQL *mysql,
			 char *to, ulong to_length,
			 const char *from, ulong from_length,
			 void *param,
			 char * (*extend_buffer)
			 (void *, char *, ulong *))
{
  char *to_end=to+to_length-5;
  const char *end;
#ifdef USE_MB
  my_bool use_mb_flag=use_mb(mysql->charset);
#endif

  for (end=from+from_length; from != end ; from++)
  {
    if (to >= to_end)
    {
      to_length = (ulong) (end-from)+512;	/* We want this much more */
      if (!(to=(*extend_buffer)(param, to, &to_length)))
	return to;
      to_end=to+to_length-5;
    }
#ifdef USE_MB
    {
      int l;
      if (use_mb_flag && (l = my_ismbchar(mysql->charset, from, end)))
      {
	while (l--)
	  *to++ = *from++;
	from--;
	continue;
      }
    }
#endif
    switch (*from) {
    case 0:				/* Must be escaped for 'mysql' */
      *to++= '\\';
      *to++= '0';
      break;
    case '\n':				/* Must be escaped for logs */
      *to++= '\\';
      *to++= 'n';
      break;
    case '\r':
      *to++= '\\';
      *to++= 'r';
      break;
    case '\\':
      *to++= '\\';
      *to++= '\\';
      break;
    case '\'':
      *to++= '\\';
      *to++= '\'';
      break;
    case '"':				/* Better safe than sorry */
      *to++= '\\';
      *to++= '"';
      break;
    case '\032':			/* This gives problems on Win32 */
      *to++= '\\';
      *to++= 'Z';
      break;
    default:
      *to++= *from;
    }
  }
  return to;
}

void STDCALL
myodbc_remove_escape(MYSQL *mysql,char *name)
{
  char *to;
#ifdef USE_MB
  my_bool use_mb_flag=use_mb(mysql->charset);
  char *end;
  LINT_INIT(end);
  if (use_mb_flag)
    for (end=name; *end ; end++) ;
#endif

  for (to=name ; *name ; name++)
  {
#ifdef USE_MB
    int l;
    if (use_mb_flag && (l = my_ismbchar( mysql->charset, name , end ) ) )
    {
      while (l--)
	*to++ = *name++;
      name--;
      continue;
    }
#endif
    if (*name == '\\' && name[1])
      name++;
    *to++= *name;
  }
  *to=0;
}
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/********************************************************************
1711
 Implementation of new client API for 4.1 version.
1712

1713
 mysql_stmt_* are real prototypes used by applications.
1714

1715 1716 1717 1718 1719
 To make API work in embedded library all functions performing
 real I/O are prefixed with 'cli_' (abbreviated from 'Call Level
 Interface'). This functions are invoked via pointers set in
 MYSQL::methods structure. Embedded counterparts, prefixed with
 'emb_' reside in libmysqld/lib_sql.cc.
1720 1721
*********************************************************************/

1722
/******************* Declarations ***********************************/
1723

1724
/* Default number of rows fetched per one COM_STMT_FETCH command. */
1725

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#define DEFAULT_PREFETCH_ROWS (ulong) 1
1727

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/*
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  These functions are called by function pointer MYSQL_STMT::read_row_func.
  Each function corresponds to one of the read methods:
  - mysql_stmt_fetch without prior mysql_stmt_store_result,
  - mysql_stmt_fetch when result is stored,
  - mysql_stmt_fetch when there are no rows (always returns MYSQL_NO_DATA)
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*/

1736 1737
static int stmt_read_row_unbuffered(MYSQL_STMT *stmt, unsigned char **row);
static int stmt_read_row_buffered(MYSQL_STMT *stmt, unsigned char **row);
1738
static int stmt_read_row_from_cursor(MYSQL_STMT *stmt, unsigned char **row);
1739
static int stmt_read_row_no_data(MYSQL_STMT *stmt, unsigned char **row);
1740
static int stmt_read_row_no_result_set(MYSQL_STMT *stmt, unsigned char **row);
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/*
  This function is used in mysql_stmt_store_result if
  STMT_ATTR_UPDATE_MAX_LENGTH attribute is set.
*/
static void stmt_update_metadata(MYSQL_STMT *stmt, MYSQL_ROWS *data);
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static my_bool setup_one_fetch_function(MYSQL_BIND *bind, MYSQL_FIELD *field);
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/* Auxilary function used to reset statement handle. */

#define RESET_SERVER_SIDE 1
#define RESET_LONG_DATA 2
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#define RESET_STORE_RESULT 4
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static my_bool reset_stmt_handle(MYSQL_STMT *stmt, uint flags);

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/*
  Maximum sizes of MYSQL_TYPE_DATE, MYSQL_TYPE_TIME, MYSQL_TYPE_DATETIME
  values stored in network buffer.
*/

/* 1 (length) + 2 (year) + 1 (month) + 1 (day) */
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#define MAX_DATE_REP_LENGTH 5
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/*
  1 (length) + 1 (is negative) + 4 (day count) + 1 (hour)
  + 1 (minute) + 1 (seconds) + 4 (microseconds)
*/
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#define MAX_TIME_REP_LENGTH 13
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/*
  1 (length) + 2 (year) + 1 (month) + 1 (day) +
  1 (hour) + 1 (minute) + 1 (second) + 4 (microseconds)
*/
1775
#define MAX_DATETIME_REP_LENGTH 12
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1777
#define MAX_DOUBLE_STRING_REP_LENGTH 331
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/* A macro to check truncation errors */

#define IS_TRUNCATED(value, is_unsigned, min, max, umax) \
        ((is_unsigned) ? (((value) > (umax) || (value) < 0) ? 1 : 0) : \
                         (((value) > (max)  || (value) < (min)) ? 1 : 0))

#define BIND_RESULT_DONE 1
/*
  We report truncations only if at least one of MYSQL_BIND::error
  pointers is set. In this case stmt->bind_result_done |-ed with
  this flag.
*/
#define REPORT_DATA_TRUNCATION 2

1793
/**************** Misc utility functions ****************************/
1794 1795

/*
1796
  Reallocate the NET package to have at least length bytes available.
1797

1798
  SYNPOSIS
1799 1800 1801 1802
    my_realloc_str()
    net                 The NET structure to modify.
    length              Ensure that net->buff has space for at least
                        this number of bytes.
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1804
  RETURN VALUES
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    0   Success.
    1   Error, i.e. out of memory or requested packet size is bigger
        than max_allowed_packet. The error code is stored in net->last_errno.
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*/

1810
static my_bool my_realloc_str(NET *net, ulong length)
1811
{
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  ulong buf_length= (ulong) (net->write_pos - net->buff);
  my_bool res=0;
  DBUG_ENTER("my_realloc_str");
  if (buf_length + length > net->max_packet)
1816
  {
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    res= net_realloc(net, buf_length + length);
    net->write_pos= net->buff+ buf_length;
1819
  }
1820
  DBUG_RETURN(res);
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}


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/* Clear possible error statee of struct NET */

static void net_clear_error(NET *net)
{
  if (net->last_errno)
  {
    net->last_errno= 0;
    net->last_error[0]= '\0';
    strmov(net->sqlstate, not_error_sqlstate);
  }
}

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static void stmt_clear_error(MYSQL_STMT *stmt)
{
  if (stmt->last_errno)
  {
    stmt->last_errno= 0;
    stmt->last_error[0]= '\0';
    strmov(stmt->sqlstate, not_error_sqlstate);
  }
}

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/*
  Set statement error code, sqlstate, and error message
  from given errcode and sqlstate.
*/

static void set_stmt_error(MYSQL_STMT * stmt, int errcode,
                           const char *sqlstate)
{
  DBUG_ENTER("set_stmt_error");
  DBUG_PRINT("enter", ("error: %d '%s'", errcode, ER(errcode)));
  DBUG_ASSERT(stmt != 0);

  stmt->last_errno= errcode;
  strmov(stmt->last_error, ER(errcode));
  strmov(stmt->sqlstate, sqlstate);

  DBUG_VOID_RETURN;
}


/*
  Set statement error code, sqlstate, and error message.
*/

void set_stmt_errmsg(MYSQL_STMT * stmt, const char *err, int errcode,
                     const char *sqlstate)
{
  DBUG_ENTER("set_stmt_errmsg");
  DBUG_PRINT("enter", ("error: %d/%s '%s'", errcode, sqlstate, err));
  DBUG_ASSERT(stmt != 0);

  stmt->last_errno= errcode;
  if (err && err[0])
    strmov(stmt->last_error, err);
  strmov(stmt->sqlstate, sqlstate);

  DBUG_VOID_RETURN;
}
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1885
/*
1886
  Read and unpack server reply to COM_STMT_PREPARE command (sent from
1887
  mysql_stmt_prepare).
1888

1889 1890 1891 1892
  SYNOPSIS
    cli_read_prepare_result()
    mysql   connection handle
    stmt    statement handle
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  RETURN VALUES
    0	ok
    1	error
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*/

1899
my_bool cli_read_prepare_result(MYSQL *mysql, MYSQL_STMT *stmt)
1900 1901
{
  uchar *pos;
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  uint field_count, param_count;
  ulong packet_length;
1904
  MYSQL_DATA *fields_data;
1905
  DBUG_ENTER("cli_read_prepare_result");
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  mysql= mysql->last_used_con;
1908
  if ((packet_length= net_safe_read(mysql)) == packet_error)
1909
    DBUG_RETURN(1);
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  mysql->warning_count= 0;
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1912
  pos= (uchar*) mysql->net.read_pos;
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  stmt->stmt_id= uint4korr(pos+1); pos+= 5;
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  /* Number of columns in result set */
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  field_count=   uint2korr(pos);   pos+= 2;
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  /* Number of placeholders in the statement */
1917
  param_count=   uint2korr(pos);   pos+= 2;
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  if (packet_length >= 12)
    mysql->warning_count= uint2korr(pos+1);
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  if (param_count != 0)
  {
    MYSQL_DATA *param_data;

    /* skip parameters data: we don't support it yet */
    if (!(param_data= (*mysql->methods->read_rows)(mysql, (MYSQL_FIELD*)0, 7)))
      DBUG_RETURN(1);
    free_rows(param_data);
  }

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  if (field_count != 0)
  {
    if (!(mysql->server_status & SERVER_STATUS_AUTOCOMMIT))
      mysql->server_status|= SERVER_STATUS_IN_TRANS;
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    if (!(fields_data= (*mysql->methods->read_rows)(mysql,(MYSQL_FIELD*)0,7)))
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      DBUG_RETURN(1);
    if (!(stmt->fields= unpack_fields(fields_data,&stmt->mem_root,
				      field_count,0,
				      mysql->server_capabilities)))
      DBUG_RETURN(1);
  }
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  stmt->field_count=  field_count;
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  stmt->param_count=  (ulong) param_count;
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  DBUG_PRINT("exit",("field_count: %u  param_count: %u  warning_count: %u",
                     field_count, param_count, (uint) mysql->warning_count));
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  DBUG_RETURN(0);
}


/*
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  Allocate memory and init prepared statement structure.

1955 1956
  SYNOPSIS
    mysql_stmt_init()
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    mysql   connection handle

  DESCRIPTION
    This is an entry point of the new API. Returned handle stands for
    a server-side prepared statement. Memory for this structure (~700
    bytes) is allocated using 'malloc'. Once created, the handle can be
    reused many times. Created statement handle is bound to connection
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    handle provided to this call: its lifetime is limited by lifetime
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    of connection.
    'mysql_stmt_init()' is a pure local call, server side structure is
    created only in mysql_stmt_prepare.
    Next steps you may want to make:
    - set a statement attribute (mysql_stmt_attr_set()),
    - prepare statement handle with a query (mysql_stmt_prepare()),
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    - close statement handle and free its memory (mysql_stmt_close()),
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    - reset statement with mysql_stmt_reset() (a no-op which will
      just return).
    Behaviour of the rest of API calls on this statement is not defined yet
    (though we're working on making each wrong call sequence return
    error).
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1978 1979 1980 1981 1982 1983 1984 1985 1986 1987 1988 1989 1990 1991 1992 1993 1994 1995
  RETURN VALUE
    statement structure upon success and NULL if out of
    memory
*/

MYSQL_STMT * STDCALL
mysql_stmt_init(MYSQL *mysql)
{
  MYSQL_STMT *stmt;
  DBUG_ENTER("mysql_stmt_init");

  if (!(stmt= (MYSQL_STMT *) my_malloc(sizeof(MYSQL_STMT),
                                       MYF(MY_WME | MY_ZEROFILL))))
  {
    set_mysql_error(mysql, CR_OUT_OF_MEMORY, unknown_sqlstate);
    DBUG_RETURN(0);
  }

1996
  init_alloc_root(&stmt->mem_root, 2048, 2048);
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  init_alloc_root(&stmt->result.alloc, 4096, 4096);
  stmt->result.alloc.min_malloc= sizeof(MYSQL_ROWS);
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  mysql->stmts= list_add(mysql->stmts, &stmt->list);
  stmt->list.data= stmt;
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  stmt->state= MYSQL_STMT_INIT_DONE;
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  stmt->mysql= mysql;
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  stmt->read_row_func= stmt_read_row_no_result_set;
2004
  stmt->prefetch_rows= DEFAULT_PREFETCH_ROWS;
2005
  strmov(stmt->sqlstate, not_error_sqlstate);
2006
  /* The rest of statement members was bzeroed inside malloc */
2007 2008 2009 2010

  DBUG_RETURN(stmt);
}

2011

2012
/*
2013 2014
  Prepare server side statement with query.

2015 2016
  SYNOPSIS
    mysql_stmt_prepare()
2017 2018 2019
    stmt    statement handle
    query   statement to prepare
    length  statement length
2020 2021

  DESCRIPTION
2022 2023 2024 2025 2026 2027 2028 2029 2030 2031 2032 2033 2034
    Associate statement with statement handle. This is done both on
    client and server sides. At this point the server parses given query
    and creates an internal structure to represent it.
    Next steps you may want to make:
    - find out if this statement returns a result set by
      calling mysql_stmt_field_count(), and get result set metadata
      with mysql_stmt_result_metadata(),
    - if query contains placeholders, bind input parameters to placeholders
      using mysql_stmt_bind_param(),
    - otherwise proceed directly to mysql_stmt_execute().

  IMPLEMENTATION NOTES
  - if this is a re-prepare of the statement, first close previous data
2035
    structure on the server and free old statement data
2036
  - then send the query to server and get back number of placeholders,
2037
    number of columns in result set (if any), and result set metadata.
2038
    At the same time allocate memory for input and output parameters
2039
    to have less checks in mysql_stmt_bind_{param, result}.
2040

2041 2042
  RETURN VALUES
    0  success
2043
   !0  error
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*/

2046 2047
int STDCALL
mysql_stmt_prepare(MYSQL_STMT *stmt, const char *query, ulong length)
2048
{
2049 2050 2051
  MYSQL *mysql= stmt->mysql;
  DBUG_ENTER("mysql_stmt_prepare");

2052
  if (!mysql)
2053
  {
2054 2055
    /* mysql can be reset in mysql_close called from mysql_reconnect */
    set_stmt_error(stmt, CR_SERVER_LOST, unknown_sqlstate);
2056
    DBUG_RETURN(1);
2057
  }
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  if ((int) stmt->state > (int) MYSQL_STMT_INIT_DONE)
  {
    /* This is second prepare with another statement */
2062
    char buff[MYSQL_STMT_HEADER];               /* 4 bytes - stmt id */
2063

2064
    if (reset_stmt_handle(stmt, RESET_LONG_DATA | RESET_STORE_RESULT))
2065
      DBUG_RETURN(1);
2066
    /*
2067
      These members must be reset for API to
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      function in case of error or misuse.
    */
    stmt->bind_param_done= stmt->bind_result_done= FALSE;
    stmt->param_count= stmt->field_count= 0;
    stmt->last_errno= 0;
    stmt->last_error[0]= '\0';
    free_root(&stmt->mem_root, MYF(MY_KEEP_PREALLOC));

    int4store(buff, stmt->stmt_id);
    /*
      If there was a 'use' result from another statement, or from
      mysql_use_result it won't be freed in mysql_stmt_free_result and
      we should get 'Commands out of sync' here.
    */
2082
    if (simple_command(mysql, COM_STMT_CLOSE, buff, 4, 1))
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    {
      set_stmt_errmsg(stmt, mysql->net.last_error, mysql->net.last_errno,
                      mysql->net.sqlstate);
      DBUG_RETURN(1);
    }
    stmt->state= MYSQL_STMT_INIT_DONE;
  }

2091
  if (simple_command(mysql, COM_STMT_PREPARE, query, length, 1))
2092
  {
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    set_stmt_errmsg(stmt, mysql->net.last_error, mysql->net.last_errno,
                    mysql->net.sqlstate);
    DBUG_RETURN(1);
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  }

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  if ((*mysql->methods->read_prepare_result)(mysql, stmt))
2099 2100 2101
  {
    set_stmt_errmsg(stmt, mysql->net.last_error, mysql->net.last_errno,
                    mysql->net.sqlstate);
2102
    DBUG_RETURN(1);
2103
  }
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2104

2105
  /*
2106
    alloc_root will return valid address even in case when param_count
2107 2108 2109 2110
    and field_count are zero. Thus we should never rely on stmt->bind
    or stmt->params when checking for existence of placeholders or
    result set.
  */
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  if (!(stmt->params= (MYSQL_BIND *) alloc_root(&stmt->mem_root,
						sizeof(MYSQL_BIND)*
2113
                                                (stmt->param_count +
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                                                 stmt->field_count))))
  {
    set_stmt_error(stmt, CR_OUT_OF_MEMORY, unknown_sqlstate);
2117
    DBUG_RETURN(1);
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  }
  stmt->bind= stmt->params + stmt->param_count;
2120
  stmt->state= MYSQL_STMT_PREPARE_DONE;
2121
  DBUG_PRINT("info", ("Parameter count: %ld", stmt->param_count));
2122
  DBUG_RETURN(0);
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}

2125
/*
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  Get result set metadata from reply to mysql_stmt_execute.
  This is used mainly for SHOW commands, as metadata for these
  commands is sent only with result set.
  To be removed when all commands will fully support prepared mode.
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*/

2132
static unsigned int alloc_stmt_fields(MYSQL_STMT *stmt)
2133
{
2134 2135
  MYSQL_FIELD *fields, *field, *end;
  MEM_ROOT *alloc= &stmt->mem_root;
2136
  MYSQL *mysql= stmt->mysql->last_used_con;
2137

2138
  stmt->field_count= mysql->field_count;
2139

2140
  /*
2141
    Get the field information for non-select statements
2142 2143
    like SHOW and DESCRIBE commands
  */
2144
  if (!(stmt->fields= (MYSQL_FIELD *) alloc_root(alloc,
2145
						 sizeof(MYSQL_FIELD) *
2146 2147
						 stmt->field_count)) ||
      !(stmt->bind= (MYSQL_BIND *) alloc_root(alloc,
2148 2149
					      sizeof(MYSQL_BIND) *
					      stmt->field_count)))
2150
    return 0;
2151 2152

  for (fields= mysql->fields, end= fields+stmt->field_count,
2153
	 field= stmt->fields;
2154 2155 2156 2157 2158 2159 2160
       field && fields < end; fields++, field++)
  {
    field->db       = strdup_root(alloc,fields->db);
    field->table    = strdup_root(alloc,fields->table);
    field->org_table= strdup_root(alloc,fields->org_table);
    field->name     = strdup_root(alloc,fields->name);
    field->org_name = strdup_root(alloc,fields->org_name);
2161
    field->charsetnr= fields->charsetnr;
2162 2163 2164 2165 2166 2167 2168
    field->length   = fields->length;
    field->type     = fields->type;
    field->flags    = fields->flags;
    field->decimals = fields->decimals;
    field->def      = fields->def ? strdup_root(alloc,fields->def): 0;
    field->max_length= 0;
  }
2169 2170
  return stmt->field_count;
}
2171

2172 2173 2174

/*
  Update result set columns metadata if it was sent again in
2175
  reply to COM_STMT_EXECUTE.
2176 2177 2178 2179 2180 2181 2182
*/

static void update_stmt_fields(MYSQL_STMT *stmt)
{
  MYSQL_FIELD *field= stmt->mysql->fields;
  MYSQL_FIELD *field_end= field + stmt->field_count;
  MYSQL_FIELD *stmt_field= stmt->fields;
2183
  MYSQL_BIND *bind= stmt->bind_result_done ? stmt->bind : 0;
2184 2185 2186 2187 2188 2189 2190 2191 2192 2193

  DBUG_ASSERT(stmt->field_count == stmt->mysql->field_count);

  for (; field < field_end; ++field, ++stmt_field)
  {
    stmt_field->charsetnr= field->charsetnr;
    stmt_field->length   = field->length;
    stmt_field->type     = field->type;
    stmt_field->flags    = field->flags;
    stmt_field->decimals = field->decimals;
2194 2195 2196 2197 2198
    if (bind)
    {
      /* Ignore return value: it should be 0 if bind_result succeeded. */
      (void) setup_one_fetch_function(bind++, stmt_field);
    }
2199 2200 2201
  }
}

2202
/*
2203 2204 2205 2206 2207 2208 2209 2210 2211
  Returns prepared statement metadata in the form of a result set.

  SYNOPSIS
    mysql_stmt_result_metadata()
    stmt  statement handle

  DESCRIPTION
    This function should be used after mysql_stmt_execute().
    You can safely check that prepared statement has a result set by calling
2212
    mysql_stmt_field_count(): if number of fields is not zero, you can call
2213 2214 2215 2216
    this function to get fields metadata.
    Next steps you may want to make:
    - find out number of columns in result set by calling
      mysql_num_fields(res) (the same value is returned by
2217
      mysql_stmt_field_count())
2218 2219 2220 2221
    - fetch metadata for any column with mysql_fetch_field,
      mysql_fetch_field_direct, mysql_fetch_fields, mysql_field_seek.
    - free returned MYSQL_RES structure with mysql_free_result.
    - proceed to binding of output parameters.
2222 2223 2224 2225 2226 2227

  RETURN
    NULL  statement contains no result set or out of memory.
          In the latter case you can retreive error message
          with mysql_stmt_error.
    MYSQL_RES  a result set with no rows
2228 2229 2230
*/

MYSQL_RES * STDCALL
2231
mysql_stmt_result_metadata(MYSQL_STMT *stmt)
2232 2233
{
  MYSQL_RES *result;
2234
  DBUG_ENTER("mysql_stmt_result_metadata");
2235

2236 2237 2238 2239 2240 2241 2242 2243 2244
  /*
    stmt->fields is only defined if stmt->field_count is not null;
    stmt->field_count is initialized in prepare.
  */
  if (!stmt->field_count)
     DBUG_RETURN(0);

  if (!(result=(MYSQL_RES*) my_malloc(sizeof(*result),
                                      MYF(MY_WME | MY_ZEROFILL))))
2245
  {
2246 2247 2248
    set_stmt_error(stmt, CR_OUT_OF_MEMORY, unknown_sqlstate);
    DBUG_RETURN(0);
  }
2249

2250 2251
  result->methods=	stmt->mysql->methods;
  result->eof=		1;                      /* Marker for buffered */
2252 2253
  result->fields=	stmt->fields;
  result->field_count=	stmt->field_count;
2254
  /* The rest of members of 'result' was bzeroed inside malloc */
2255
  DBUG_RETURN(result);
2256 2257
}

2258

2259
/*
2260 2261
  Returns parameter columns meta information in the form of
  result set.
2262 2263 2264 2265 2266 2267 2268 2269 2270 2271 2272 2273 2274

  SYNOPSYS
    mysql_stmt_param_metadata()
    stmt    statement handle

  DESCRIPTION
    This function can be called after you prepared the statement handle
    with mysql_stmt_prepare().
    XXX: not implemented yet.

  RETURN
    MYSQL_RES on success, 0 if there is no metadata.
    Currently this function always returns 0.
2275 2276 2277
*/

MYSQL_RES * STDCALL
2278
mysql_stmt_param_metadata(MYSQL_STMT *stmt)
2279
{
2280
  DBUG_ENTER("mysql_stmt_param_metadata");
2281

2282 2283 2284 2285
  if (!stmt->param_count)
    DBUG_RETURN(0);

  /*
2286 2287
    TODO: Fix this when server sends the information.
    Till then keep a dummy prototype.
2288 2289 2290 2291 2292
  */
  DBUG_RETURN(0); 
}


2293 2294 2295 2296 2297 2298 2299 2300 2301 2302
/* Store type of parameter in network buffer. */

static void store_param_type(char **pos, MYSQL_BIND *param)
{
  uint typecode= param->buffer_type | (param->is_unsigned ? 32768 : 0);
  int2store(*pos, typecode);
  *pos+= 2;
}


2303 2304
/*
  Functions to store parameter data in network packet.
2305

2306 2307 2308 2309 2310
  SYNOPSIS
    store_param_xxx()
    net			MySQL NET connection
    param		MySQL bind param

2311
  DESCRIPTION
2312 2313 2314 2315 2316
    These funtions are invoked from mysql_stmt_execute() by
    MYSQL_BIND::store_param_func pointer. This pointer is set once per
    many executions in mysql_stmt_bind_param(). The caller must ensure
    that network buffer have enough capacity to store parameter
    (MYSQL_BIND::buffer_length contains needed number of bytes).
2317
*/
2318 2319 2320

static void store_param_tinyint(NET *net, MYSQL_BIND *param)
{
2321
  *(net->write_pos++)= *(uchar *) param->buffer;
2322 2323
}

2324 2325 2326 2327 2328 2329
static void store_param_short(NET *net, MYSQL_BIND *param)
{
  short value= *(short*) param->buffer;
  int2store(net->write_pos,value);
  net->write_pos+=2;
}
2330

2331
static void store_param_int32(NET *net, MYSQL_BIND *param)
2332
{
2333 2334 2335 2336
  int32 value= *(int32*) param->buffer;
  int4store(net->write_pos,value);
  net->write_pos+=4;
}
2337

2338 2339 2340 2341 2342 2343
static void store_param_int64(NET *net, MYSQL_BIND *param)
{
  longlong value= *(longlong*) param->buffer;
  int8store(net->write_pos,value);
  net->write_pos+= 8;
}
2344

2345 2346 2347 2348 2349
static void store_param_float(NET *net, MYSQL_BIND *param)
{
  float value= *(float*) param->buffer;
  float4store(net->write_pos, value);
  net->write_pos+= 4;
2350 2351
}

2352 2353 2354 2355 2356 2357
static void store_param_double(NET *net, MYSQL_BIND *param)
{
  double value= *(double*) param->buffer;
  float8store(net->write_pos, value);
  net->write_pos+= 8;
}
2358

2359 2360 2361
static void store_param_time(NET *net, MYSQL_BIND *param)
{
  MYSQL_TIME *tm= (MYSQL_TIME *) param->buffer;
2362
  char buff[MAX_TIME_REP_LENGTH], *pos;
2363 2364 2365 2366 2367 2368 2369 2370 2371 2372
  uint length;

  pos= buff+1;
  pos[0]= tm->neg ? 1: 0;
  int4store(pos+1, tm->day);
  pos[5]= (uchar) tm->hour;
  pos[6]= (uchar) tm->minute;
  pos[7]= (uchar) tm->second;
  int4store(pos+8, tm->second_part);
  if (tm->second_part)
2373
    length= 12;
2374 2375 2376 2377
  else if (tm->hour || tm->minute || tm->second || tm->day)
    length= 8;
  else
    length= 0;
2378
  buff[0]= (char) length++;
2379 2380 2381 2382 2383 2384
  memcpy((char *)net->write_pos, buff, length);
  net->write_pos+= length;
}

static void net_store_datetime(NET *net, MYSQL_TIME *tm)
{
2385
  char buff[MAX_DATETIME_REP_LENGTH], *pos;
2386 2387 2388 2389 2390 2391 2392 2393 2394 2395 2396 2397 2398 2399 2400 2401 2402 2403 2404
  uint length;

  pos= buff+1;

  int2store(pos, tm->year);
  pos[2]= (uchar) tm->month;
  pos[3]= (uchar) tm->day;
  pos[4]= (uchar) tm->hour;
  pos[5]= (uchar) tm->minute;
  pos[6]= (uchar) tm->second;
  int4store(pos+7, tm->second_part);
  if (tm->second_part)
    length= 11;
  else if (tm->hour || tm->minute || tm->second)
    length= 7;
  else if (tm->year || tm->month || tm->day)
    length= 4;
  else
    length= 0;
2405
  buff[0]= (char) length++;
2406 2407 2408 2409 2410 2411 2412 2413 2414 2415 2416 2417 2418 2419 2420 2421 2422
  memcpy((char *)net->write_pos, buff, length);
  net->write_pos+= length;
}

static void store_param_date(NET *net, MYSQL_BIND *param)
{
  MYSQL_TIME *tm= (MYSQL_TIME *) param->buffer;
  tm->hour= tm->minute= tm->second= 0;
  tm->second_part= 0;
  net_store_datetime(net, tm);
}

static void store_param_datetime(NET *net, MYSQL_BIND *param)
{
  MYSQL_TIME *tm= (MYSQL_TIME *) param->buffer;
  net_store_datetime(net, tm);
}
2423

2424
static void store_param_str(NET *net, MYSQL_BIND *param)
2425
{
2426 2427
  /* param->length is always set in mysql_stmt_bind_param */
  ulong length= *param->length;
2428 2429
  char *to= (char *) net_store_length((char *) net->write_pos, length);
  memcpy(to, param->buffer, length);
2430
  net->write_pos= (uchar*) to+length;
2431 2432
}

2433

2434
/*
2435 2436 2437 2438 2439 2440 2441 2442 2443
  Mark if the parameter is NULL.

  SYNOPSIS
    store_param_null()
    net			MySQL NET connection
    param		MySQL bind param

  DESCRIPTION
    A data package starts with a string of bits where we set a bit
2444 2445
    if a parameter is NULL. Unlike bit string in result set row, here
    we don't have reserved bits for OK/error packet.
2446 2447
*/

2448
static void store_param_null(NET *net, MYSQL_BIND *param)
2449
{
2450
  uint pos= param->param_number;
monty@narttu.mysql.fi's avatar
monty@narttu.mysql.fi committed
2451
  net->buff[pos/8]|=  (uchar) (1 << (pos & 7));
2452
}
2453 2454 2455


/*
2456 2457 2458
  Store one parameter in network packet: data is read from
  client buffer and saved in network packet by means of one
  of store_param_xxxx functions.
2459 2460
*/

2461
static my_bool store_param(MYSQL_STMT *stmt, MYSQL_BIND *param)
2462
{
2463
  NET *net= &stmt->mysql->net;
2464
  DBUG_ENTER("store_param");
2465 2466 2467 2468 2469 2470
  DBUG_PRINT("enter",("type: %d, buffer:%lx, length: %lu  is_null: %d",
		      param->buffer_type,
		      param->buffer ? param->buffer : "0", *param->length,
		      *param->is_null));

  if (*param->is_null)
2471 2472
    store_param_null(net, param);
  else
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2473
  {
2474 2475
    /*
      Param->length should ALWAYS point to the correct length for the type
2476
      Either to the length pointer given by the user or param->buffer_length
2477
    */
2478
    if ((my_realloc_str(net, *param->length)))
2479
    {
2480
      set_stmt_error(stmt, net->last_errno, unknown_sqlstate);
venu@myvenu.com's avatar
venu@myvenu.com committed
2481
      DBUG_RETURN(1);
2482
    }
2483
    (*param->store_param_func)(net, param);
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venu@myvenu.com committed
2484 2485
  }
  DBUG_RETURN(0);
2486 2487
}

2488

2489
/*
2490
  Auxilary function to send COM_STMT_EXECUTE packet to server and read reply.
2491
  Used from cli_stmt_execute, which is in turn used by mysql_stmt_execute.
2492 2493
*/

2494
static my_bool execute(MYSQL_STMT *stmt, char *packet, ulong length)
2495
{
2496 2497
  MYSQL *mysql= stmt->mysql;
  NET	*net= &mysql->net;
2498
  char buff[4 /* size of stmt id */ +
2499
            5 /* execution flags */];
2500
  DBUG_ENTER("execute");
2501
  DBUG_DUMP("packet", packet, length);
2502

2503 2504
  mysql->last_used_con= mysql;
  int4store(buff, stmt->stmt_id);		/* Send stmt id to server */
2505
  buff[4]= (char) stmt->flags;
2506
  int4store(buff+5, 1);                         /* iteration count */
2507
  if (cli_advanced_command(mysql, COM_STMT_EXECUTE, buff, sizeof(buff),
2508
                           packet, length, 1) ||
hf@deer.(none)'s avatar
hf@deer.(none) committed
2509
      (*mysql->methods->read_query_result)(mysql))
2510
  {
2511
    set_stmt_errmsg(stmt, net->last_error, net->last_errno, net->sqlstate);
2512
    DBUG_RETURN(1);
2513
  }
2514
  stmt->affected_rows= mysql->affected_rows;
2515
  stmt->server_status= mysql->server_status;
2516
  stmt->insert_id= mysql->insert_id;
2517 2518 2519
  DBUG_RETURN(0);
}

2520 2521

int cli_stmt_execute(MYSQL_STMT *stmt)
2522
{
hf@deer.(none)'s avatar
SCRUM  
hf@deer.(none) committed
2523
  DBUG_ENTER("cli_stmt_execute");
2524 2525 2526

  if (stmt->param_count)
  {
2527 2528
    NET        *net= &stmt->mysql->net;
    MYSQL_BIND *param, *param_end;
2529
    char       *param_data;
venu@myvenu.com's avatar
venu@myvenu.com committed
2530 2531 2532
    ulong length;
    uint null_count;
    my_bool    result;
2533

2534 2535 2536 2537 2538
    if (!stmt->bind_param_done)
    {
      set_stmt_error(stmt, CR_PARAMS_NOT_BOUND, unknown_sqlstate);
      DBUG_RETURN(1);
    }
2539 2540 2541 2542 2543
    if (stmt->mysql->status != MYSQL_STATUS_READY)
    {
      set_stmt_error(stmt, CR_COMMANDS_OUT_OF_SYNC, unknown_sqlstate);
      DBUG_RETURN(1);
    }
2544

2545 2546 2547
    net_clear(net);				/* Sets net->write_pos */
    /* Reserve place for null-marker bytes */
    null_count= (stmt->param_count+7) /8;
2548 2549 2550 2551 2552
    if (my_realloc_str(net, null_count + 1))
    {
      set_stmt_error(stmt, net->last_errno, unknown_sqlstate);
      DBUG_RETURN(1);
    }
2553 2554 2555 2556 2557
    bzero((char*) net->write_pos, null_count);
    net->write_pos+= null_count;
    param_end= stmt->params + stmt->param_count;

    /* In case if buffers (type) altered, indicate to server */
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2558 2559
    *(net->write_pos)++= (uchar) stmt->send_types_to_server;
    if (stmt->send_types_to_server)
2560
    {
2561 2562 2563 2564 2565
      if (my_realloc_str(net, 2 * stmt->param_count))
      {
        set_stmt_error(stmt, net->last_errno, unknown_sqlstate);
        DBUG_RETURN(1);
      }
2566 2567 2568 2569 2570
      /*
	Store types of parameters in first in first package
	that is sent to the server.
      */
      for (param= stmt->params;	param < param_end ; param++)
2571
        store_param_type((char**) &net->write_pos, param);
2572 2573 2574
    }

    for (param= stmt->params; param < param_end; param++)
2575
    {
2576
      /* check if mysql_stmt_send_long_data() was used */
2577 2578
      if (param->long_data_used)
	param->long_data_used= 0;	/* Clear for next execute call */
2579
      else if (store_param(stmt, param))
2580
	DBUG_RETURN(1);
2581
    }
2582 2583
    length= (ulong) (net->write_pos - net->buff);
    /* TODO: Look into avoding the following memdup */
2584
    if (!(param_data= my_memdup((const char*) net->buff, length, MYF(0))))
2585
    {
2586
      set_stmt_error(stmt, CR_OUT_OF_MEMORY, unknown_sqlstate);
2587
      DBUG_RETURN(1);
2588
    }
2589
    result= execute(stmt, param_data, length);
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2590
    stmt->send_types_to_server=0;
2591
    my_free(param_data, MYF(MY_WME));
2592 2593 2594
    DBUG_RETURN(result);
  }
  DBUG_RETURN((int) execute(stmt,0,0));
2595 2596
}

2597 2598 2599 2600 2601 2602 2603 2604 2605 2606 2607 2608 2609 2610
/*
  Read one row from buffered result set.  Result set is created by prior
  call to mysql_stmt_store_result().
  SYNOPSIS
    stmt_read_row_buffered()

  RETURN VALUE
    0             - success; *row is set to valid row pointer (row data
                    is stored in result set buffer)
    MYSQL_NO_DATA - end of result set. *row is set to NULL
*/

static int stmt_read_row_buffered(MYSQL_STMT *stmt, unsigned char **row)
{
2611
  if (stmt->data_cursor)
2612
  {
2613 2614
    *row= (uchar *) stmt->data_cursor->data;
    stmt->data_cursor= stmt->data_cursor->next;
2615 2616 2617 2618 2619 2620 2621 2622 2623 2624 2625 2626 2627 2628 2629 2630 2631 2632 2633 2634
    return 0;
  }
  *row= 0;
  return MYSQL_NO_DATA;
}

/*
  Read one row from network: unbuffered non-cursor fetch.
  If last row was read, or error occured, erase this statement
  from record pointing to object unbuffered fetch is performed from.

  SYNOPSIS
    stmt_read_row_unbuffered()
    stmt  statement handle
    row   pointer to write pointer to row data;

  RETURN VALUE
    0           - success; *row contains valid address of a row;
                  row data is stored in network buffer
    1           - error; error code is written to
2635
                  stmt->last_{errno,error}; *row is not changed
2636
  MYSQL_NO_DATA - end of file was read from network;
2637
                  *row is set to NULL
2638 2639 2640 2641 2642 2643
*/

static int stmt_read_row_unbuffered(MYSQL_STMT *stmt, unsigned char **row)
{
  int rc= 1;
  MYSQL *mysql= stmt->mysql;
2644
  /*
2645 2646 2647 2648 2649 2650 2651 2652 2653 2654 2655
    This function won't be called if stmt->field_count is zero
    or execution wasn't done: this is ensured by mysql_stmt_execute.
  */
  if (!mysql)
  {
    set_stmt_error(stmt, CR_SERVER_LOST, unknown_sqlstate);
    return 1;
  }
  if (mysql->status != MYSQL_STATUS_GET_RESULT)
  {
    set_stmt_error(stmt, stmt->unbuffered_fetch_cancelled ?
2656
                   CR_FETCH_CANCELED : CR_COMMANDS_OUT_OF_SYNC,
2657 2658 2659 2660 2661 2662 2663
                   unknown_sqlstate);
    goto error;
  }
  if ((*mysql->methods->unbuffered_fetch)(mysql, (char**) row))
  {
    set_stmt_errmsg(stmt, mysql->net.last_error, mysql->net.last_errno,
                    mysql->net.sqlstate);
2664 2665 2666 2667 2668 2669 2670
    /*
      If there was an error, there are no more pending rows:
      reset statement status to not hang up in following
      mysql_stmt_close (it will try to flush result set before
      closing the statement).
    */
    mysql->status= MYSQL_STATUS_READY;
2671 2672 2673 2674 2675 2676 2677 2678 2679 2680 2681 2682 2683 2684 2685
    goto error;
  }
  if (!*row)
  {
    mysql->status= MYSQL_STATUS_READY;
    rc= MYSQL_NO_DATA;
    goto error;
  }
  return 0;
error:
  if (mysql->unbuffered_fetch_owner == &stmt->unbuffered_fetch_cancelled)
    mysql->unbuffered_fetch_owner= 0;
  return rc;
}

2686 2687 2688 2689 2690 2691 2692 2693 2694 2695 2696 2697 2698 2699 2700 2701 2702 2703 2704 2705 2706 2707 2708 2709 2710 2711 2712 2713 2714 2715 2716 2717 2718

/*
  Fetch statement row using server side cursor.

  SYNOPSIS
    stmt_read_row_from_cursor()

  RETURN VALUE
    0            success
    1            error
  MYSQL_NO_DATA  end of data
*/

static int
stmt_read_row_from_cursor(MYSQL_STMT *stmt, unsigned char **row)
{
  if (stmt->data_cursor)
    return stmt_read_row_buffered(stmt, row);
  if (stmt->server_status & SERVER_STATUS_LAST_ROW_SENT)
    stmt->server_status &= ~SERVER_STATUS_LAST_ROW_SENT;
  else
  {
    MYSQL *mysql= stmt->mysql;
    NET *net= &mysql->net;
    MYSQL_DATA *result= &stmt->result;
    char buff[4 /* statement id */ +
              4 /* number of rows to fetch */];

    free_root(&result->alloc, MYF(MY_KEEP_PREALLOC));
    result->data= NULL;
    result->rows= 0;
    /* Send row request to the server */
    int4store(buff, stmt->stmt_id);
2719
    int4store(buff + 4, stmt->prefetch_rows); /* number of rows to fetch */
2720 2721
    if ((*mysql->methods->advanced_command)(mysql, COM_STMT_FETCH,
                                            buff, sizeof(buff), NullS, 0, 1))
2722 2723 2724 2725
    {
      set_stmt_errmsg(stmt, net->last_error, net->last_errno, net->sqlstate);
      return 1;
    }
2726
    if ((*mysql->methods->read_rows_from_cursor)(stmt))
2727 2728 2729 2730 2731 2732 2733 2734 2735 2736 2737
      return 1;
    stmt->server_status= mysql->server_status;

    stmt->data_cursor= result->data;
    return stmt_read_row_buffered(stmt, row);
  }
  *row= 0;
  return MYSQL_NO_DATA;
}


2738 2739 2740 2741 2742 2743 2744 2745
/*
  Default read row function to not SIGSEGV in client in
  case of wrong sequence of API calls.
*/

static int
stmt_read_row_no_data(MYSQL_STMT *stmt  __attribute__((unused)),
                      unsigned char **row  __attribute__((unused)))
2746 2747 2748 2749 2750 2751 2752
{
  return MYSQL_NO_DATA;
}

static int
stmt_read_row_no_result_set(MYSQL_STMT *stmt  __attribute__((unused)),
                      unsigned char **row  __attribute__((unused)))
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{
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  set_stmt_error(stmt, CR_NO_RESULT_SET, unknown_sqlstate);
  return 1;
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}

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/*
  Get/set statement attributes

  SYNOPSIS
    mysql_stmt_attr_get()
    mysql_stmt_attr_set()

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    attr_type  statement attribute
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    value      casted to const void * pointer to value.

  RETURN VALUE
    0 success
   !0 wrong attribute type
*/
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my_bool STDCALL mysql_stmt_attr_set(MYSQL_STMT *stmt,
                                    enum enum_stmt_attr_type attr_type,
                                    const void *value)
{
  switch (attr_type) {
  case STMT_ATTR_UPDATE_MAX_LENGTH:
    stmt->update_max_length= value ? *(const my_bool*) value : 0;
    break;
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  case STMT_ATTR_CURSOR_TYPE:
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  {
    ulong cursor_type;
    cursor_type= value ? *(ulong*) value : 0UL;
    if (cursor_type > (ulong) CURSOR_TYPE_READ_ONLY)
      goto err_not_implemented;
    stmt->flags= cursor_type;
    break;
  }
  case STMT_ATTR_PREFETCH_ROWS:
  {
    ulong prefetch_rows= value ? *(ulong*) value : DEFAULT_PREFETCH_ROWS;
    if (value == 0)
      return TRUE;
    stmt->prefetch_rows= prefetch_rows;
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    break;
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  }
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  default:
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    goto err_not_implemented;
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  }
  return FALSE;
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err_not_implemented:
  set_stmt_error(stmt, CR_NOT_IMPLEMENTED, unknown_sqlstate);
  return TRUE;
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}


2809
my_bool STDCALL mysql_stmt_attr_get(MYSQL_STMT *stmt,
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                                    enum enum_stmt_attr_type attr_type,
                                    void *value)
{
  switch (attr_type) {
  case STMT_ATTR_UPDATE_MAX_LENGTH:
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    *(my_bool*) value= stmt->update_max_length;
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    break;
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  case STMT_ATTR_CURSOR_TYPE:
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    *(ulong*) value= stmt->flags;
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      break;
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  case STMT_ATTR_PREFETCH_ROWS:
    *(ulong*) value= stmt->prefetch_rows;
    break;
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  default:
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    return TRUE;
  }
  return FALSE;
}


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/*
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  Send placeholders data to server (if there are placeholders)
  and execute prepared statement.

  SYNOPSIS
    mysql_stmt_execute()
    stmt  statement handle. The handle must be created
          with mysql_stmt_init() and prepared with
          mysql_stmt_prepare(). If there are placeholders
          in the statement they must be bound to local
          variables with mysql_stmt_bind_param().

  DESCRIPTION
    This function will automatically flush pending result
    set (if there is one), send parameters data to the server
    and read result of statement execution.
    If previous result set was cached with mysql_stmt_store_result()
    it will also be freed in the beginning of this call.
    The server can return 3 types of responses to this command:
    - error, can be retrieved with mysql_stmt_error()
    - ok, no result set pending. In this case we just update
      stmt->insert_id and stmt->affected_rows.
    - the query returns a result set: there could be 0 .. N
    rows in it. In this case the server can also send updated
    result set metadata.

    Next steps you may want to make:
    - find out if there is result set with mysql_stmt_field_count().
    If there is one:
    - optionally, cache entire result set on client to unblock
    connection with mysql_stmt_store_result()
    - bind client variables to result set columns and start read rows
    with mysql_stmt_fetch().
    - reset statement with mysql_stmt_reset() or close it with
    mysql_stmt_close()
    Otherwise:
    - find out last insert id and number of affected rows with
    mysql_stmt_insert_id(), mysql_stmt_affected_rows()

  RETURN
    0   success
    1   error, message can be retrieved with mysql_stmt_error().
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*/

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int STDCALL mysql_stmt_execute(MYSQL_STMT *stmt)
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{
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  MYSQL *mysql= stmt->mysql;
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  DBUG_ENTER("mysql_stmt_execute");
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  if (!mysql)
  {
    set_stmt_error(stmt, CR_SERVER_LOST, unknown_sqlstate);
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    DBUG_RETURN(1);
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  }

2885
  if (reset_stmt_handle(stmt, RESET_STORE_RESULT))
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    DBUG_RETURN(1);
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  /*
    No need to check for stmt->state: if the statement wasn't
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    prepared we'll get 'unknown statement handler' error from server.
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  */
  if (mysql->methods->stmt_execute(stmt))
    DBUG_RETURN(1);
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  if (mysql->field_count)
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  {
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    /* Server has sent result set metadata */
    if (stmt->field_count == 0)
    {
      /*
        This is 'SHOW'/'EXPLAIN'-like query. Current implementation of
        prepared statements can't send result set metadata for these queries
        on prepare stage. Read it now.
      */
      alloc_stmt_fields(stmt);
    }
    else
    {
      /*
        Update result set metadata if it for some reason changed between
        prepare and execute, i.e.:
        - in case of 'SELECT ?' we don't know column type unless data was
          supplied to mysql_stmt_execute, so updated column type is sent
          now.
        - if data dictionary changed between prepare and execute, for
          example a table used in the query was altered.
        Note, that now (4.1.3) we always send metadata in reply to
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        COM_STMT_EXECUTE (even if it is not necessary), so either this or
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        previous branch always works.
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        TODO: send metadata only when it's really necessary and add a warning
        'Metadata changed' when it's sent twice.
      */
      update_stmt_fields(stmt);
    }
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  }
  stmt->state= MYSQL_STMT_EXECUTE_DONE;
  if (stmt->field_count)
  {
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    if (stmt->server_status & SERVER_STATUS_CURSOR_EXISTS)
    {
      mysql->status= MYSQL_STATUS_READY;
      stmt->read_row_func= stmt_read_row_from_cursor;
    }
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    else if (stmt->flags & CURSOR_TYPE_READ_ONLY)
    {
      /*
        This is a single-row result set, a result set with no rows, EXPLAIN,
        SHOW VARIABLES, or some other command which either a) bypasses the
        cursors framework in the server and writes rows directly to the
        network or b) is more efficient if all (few) result set rows are
        precached on client and server's resources are freed.
      */
      DBUG_RETURN(mysql_stmt_store_result(stmt));
    }
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    else
    {
      stmt->mysql->unbuffered_fetch_owner= &stmt->unbuffered_fetch_cancelled;
      stmt->unbuffered_fetch_cancelled= FALSE;
      stmt->read_row_func= stmt_read_row_unbuffered;
    }
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  }
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  DBUG_RETURN(0);
}

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/*
  Return total parameters count in the statement
*/

2958
ulong STDCALL mysql_stmt_param_count(MYSQL_STMT * stmt)
2959
{
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  DBUG_ENTER("mysql_stmt_param_count");
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  DBUG_RETURN(stmt->param_count);
}

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/*
  Return total affected rows from the last statement
*/

my_ulonglong STDCALL mysql_stmt_affected_rows(MYSQL_STMT *stmt)
{
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  return stmt->affected_rows;
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}
2972

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/*
  Returns the number of result columns for the most recent query
  run on this statement.
*/

unsigned int STDCALL mysql_stmt_field_count(MYSQL_STMT *stmt)
{
  return stmt->field_count;
}

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/*
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  Return last inserted id for auto_increment columns.

  SYNOPSIS
    mysql_stmt_insert_id()
    stmt    statement handle

  DESCRIPTION
    Current implementation of this call has a caveat: stmt->insert_id is
    unconditionally updated from mysql->insert_id in the end of each
    mysql_stmt_execute(). This works OK if mysql->insert_id contains new
    value (sent in reply to mysql_stmt_execute()), otherwise stmt->insert_id
    value gets undefined, as it's updated from some arbitrary value saved in
    connection structure during some other call.
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*/

my_ulonglong STDCALL mysql_stmt_insert_id(MYSQL_STMT *stmt)
{
  return stmt->insert_id;
}

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static my_bool int_is_null_true= 1;		/* Used for MYSQL_TYPE_NULL */
static my_bool int_is_null_false= 0;

3009

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/*
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  Set up input data buffers for a statement.
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  SYNOPSIS
    mysql_stmt_bind_param()
    stmt    statement handle
            The statement must be prepared with mysql_stmt_prepare().
    bind    Array of mysql_stmt_param_count() bind parameters.
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            This function doesn't check that size of this argument
            is >= mysql_stmt_field_count(): it's user's responsibility.

  DESCRIPTION
    Use this call after mysql_stmt_prepare() to bind user variables to
    placeholders.
    Each element of bind array stands for a placeholder. Placeholders
    are counted from 0.  For example statement
    'INSERT INTO t (a, b) VALUES (?, ?)'
    contains two placeholders, and for such statement you should supply
    bind array of two elements (MYSQL_BIND bind[2]).

    By properly initializing bind array you can bind virtually any
    C language type to statement's placeholders:
    First, it's strongly recommended to always zero-initialize entire
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    bind structure before setting its members. This will both shorten
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    your application code and make it robust to future extensions of
    MYSQL_BIND structure.
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    Then you need to assign typecode of your application buffer to
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    MYSQL_BIND::buffer_type. The following typecodes with their
    correspondence to C language types are supported:
    MYSQL_TYPE_TINY       for 8-bit integer variables. Normally it's
                          'signed char' and 'unsigned char';
    MYSQL_TYPE_SHORT      for 16-bit signed and unsigned variables. This
                          is usually 'short' and 'unsigned short';
    MYSQL_TYPE_LONG       for 32-bit signed and unsigned variables. It
                          corresponds to 'int' and 'unsigned int' on
                          vast majority of platforms. On IA-32 and some
                          other 32-bit systems you can also use 'long'
                          here;
    MYSQL_TYPE_LONGLONG   64-bit signed or unsigned integer.  Stands for
                          '[unsigned] long long' on most platforms;
    MYSQL_TYPE_FLOAT      32-bit floating point type, 'float' on most
                          systems;
    MYSQL_TYPE_DOUBLE     64-bit floating point type, 'double' on most
                          systems;
    MYSQL_TYPE_TIME       broken-down time stored in MYSQL_TIME
                          structure
    MYSQL_TYPE_DATE       date stored in MYSQL_TIME structure
    MYSQL_TYPE_DATETIME   datetime stored in MYSQL_TIME structure See
                          more on how to use these types for sending
                          dates and times below;
    MYSQL_TYPE_STRING     character string, assumed to be in
                          character-set-client. If character set of
                          client is not equal to character set of
                          column, value for this placeholder will be
                          converted to destination character set before
                          insert.
    MYSQL_TYPE_BLOB       sequence of bytes. This sequence is assumed to
                          be in binary character set (which is the same
                          as no particular character set), and is never
                          converted to any other character set. See also
                          notes about supplying string/blob length
                          below.
    MYSQL_TYPE_NULL       special typecode for binding nulls.
    These C/C++ types are not supported yet by the API: long double,
    bool.

    As you can see from the list above, it's responsibility of
    application programmer to ensure that chosen typecode properly
    corresponds to host language type. For example on all platforms
    where we build MySQL packages (as of MySQL 4.1.4) int is a 32-bit
    type. So for int you can always assume that proper typecode is
    MYSQL_TYPE_LONG (however queer it sounds, the name is legacy of the
    old MySQL API). In contrary sizeof(long) can be 4 or 8 8-bit bytes,
    depending on platform.

    TODO: provide client typedefs for each integer and floating point
    typecode, i. e. int8, uint8, float32, etc.

    Once typecode was set, it's necessary to assign MYSQL_BIND::buffer
    to point to the buffer of given type. Finally, additional actions
    may be taken for some types or use cases:

      Binding integer types.
    For integer types you might also need to set MYSQL_BIND::is_unsigned
    member. Set it to TRUE when binding unsigned char, unsigned short,
    unsigned int, unsigned long, unsigned long long.

      Binding floating point types.
    For floating point types you just need to set
    MYSQL_BIND::buffer_type and MYSQL_BIND::buffer. The rest of the
    members should be zero-initialized.

      Binding NULLs.
    You might have a column always NULL, never NULL, or sometimes NULL.
    For an always NULL column set MYSQL_BIND::buffer_type to
    MYSQL_TYPE_NULL.  The rest of the members just need to be
    zero-initialized.  For never NULL columns set MYSQL_BIND::is_null to
    0, or this has already been done if you zero-initialized the entire
    structure.  If you set MYSQL_TYPE::is_null to point to an
    application buffer of type 'my_bool', then this buffer will be
    checked on each execution: this way you can set the buffer to TRUE,
    or any non-0 value for NULLs, and to FALSE or 0 for not NULL data.

      Binding text strings and sequences of bytes.
    For strings, in addition to MYSQL_BIND::buffer_type and
    MYSQL_BIND::buffer you need to set MYSQL_BIND::length or
    MYSQL_BIND::buffer_length.
    If 'length' is set, 'buffer_length' is ignored. 'buffer_length'
    member should be used when size of string doesn't change between
    executions. If you want to vary buffer length for each value, set
    'length' to point to an application buffer of type 'unsigned long'
    and set this long to length of the string before each
    mysql_stmt_execute().

      Binding dates and times.
    For binding dates and times prepared statements API provides clients
    with MYSQL_TIME structure. A pointer to instance of this structure
    should be assigned to MYSQL_BIND::buffer whenever MYSQL_TYPE_TIME,
    MYSQL_TYPE_DATE, MYSQL_TYPE_DATETIME typecodes are used.  When
    typecode is MYSQL_TYPE_TIME, only members 'hour', 'minute', 'second'
    and 'neg' (is time offset negative) are used. These members only
    will be sent to the server.
    MYSQL_TYPE_DATE implies use of 'year', 'month', 'day', 'neg'.
    MYSQL_TYPE_DATETIME utilizes both parts of MYSQL_TIME structure.
    You don't have to set MYSQL_TIME::time_type member: it's not used
    when sending data to the server, typecode information is enough.
    'second_part' member can hold microsecond precision of time value,
    but now it's only supported on protocol level: you can't store
    microsecond in a column, or use in temporal calculations. However,
    if you send a time value with microsecond part for 'SELECT ?',
    statement, you'll get it back unchanged from the server.

      Data conversion.
    If conversion from host language type to data representation,
    corresponding to SQL type, is required it's done on the server.
    Data truncation is possible when conversion is lossy. For example,
    if you supply MYSQL_TYPE_DATETIME value out of valid SQL type
    TIMESTAMP range, the same conversion will be applied as if this
    value would have been sent as string in the old protocol.
    TODO: document how the server will behave in case of truncation/data
    loss.

    After variables were bound, you can repeatedly set/change their
    values and mysql_stmt_execute() the statement.

    See also: mysql_stmt_send_long_data() for sending long text/blob
3156
    data in pieces, examples in tests/mysql_client_test.c.
3157 3158 3159 3160 3161 3162 3163 3164 3165 3166
    Next steps you might want to make:
    - execute statement with mysql_stmt_execute(),
    - reset statement using mysql_stmt_reset() or reprepare it with
      another query using mysql_stmt_prepare()
    - close statement with mysql_stmt_close().

  IMPLEMENTATION
    The function copies given bind array to internal storage of the
    statement, and sets up typecode-specific handlers to perform
    serialization of bound data. This means that although you don't need
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    to call this routine after each assignment to bind buffers, you
    need to call it each time you change parameter typecodes, or other
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    members of MYSQL_BIND array.
    This is a pure local call. Data types of client buffers are sent
    along with buffers' data at first execution of the statement.
3172 3173 3174 3175

  RETURN
    0  success
    1  error, can be retrieved with mysql_stmt_error.
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*/

3178
my_bool STDCALL mysql_stmt_bind_param(MYSQL_STMT *stmt, MYSQL_BIND *bind)
3179
{
3180 3181
  uint count=0;
  MYSQL_BIND *param, *end;
3182
  DBUG_ENTER("mysql_stmt_bind_param");
3183

3184 3185 3186 3187 3188 3189 3190 3191 3192 3193
  if (!stmt->param_count)
  {
    if ((int) stmt->state < (int) MYSQL_STMT_PREPARE_DONE)
    {
      set_stmt_error(stmt, CR_NO_PREPARE_STMT, unknown_sqlstate);
      DBUG_RETURN(1);
    }
    DBUG_RETURN(0);
  }

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  /* Allocated on prepare */
  memcpy((char*) stmt->params, (char*) bind,
	 sizeof(MYSQL_BIND) * stmt->param_count);

  for (param= stmt->params, end= param+stmt->param_count;
       param < end ;
       param++)
3201
  {
3202
    param->param_number= count++;
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    param->long_data_used= 0;

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    /* If param->is_null is not set, then the value can never be NULL */
    if (!param->is_null)
      param->is_null= &int_is_null_false;

3209 3210
    /* Setup data copy functions for the different supported types */
    switch (param->buffer_type) {
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    case MYSQL_TYPE_NULL:
3212
      param->is_null= &int_is_null_true;
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      break;
3214
    case MYSQL_TYPE_TINY:
3215
      /* Force param->length as this is fixed for this type */
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      param->length= &param->buffer_length;
      param->buffer_length= 1;
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      param->store_param_func= store_param_tinyint;
      break;
    case MYSQL_TYPE_SHORT:
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      param->length= &param->buffer_length;
      param->buffer_length= 2;
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      param->store_param_func= store_param_short;
      break;
    case MYSQL_TYPE_LONG:
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      param->length= &param->buffer_length;
      param->buffer_length= 4;
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      param->store_param_func= store_param_int32;
      break;
    case MYSQL_TYPE_LONGLONG:
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      param->length= &param->buffer_length;
      param->buffer_length= 8;
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      param->store_param_func= store_param_int64;
      break;
    case MYSQL_TYPE_FLOAT:
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      param->length= &param->buffer_length;
      param->buffer_length= 4;
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      param->store_param_func= store_param_float;
      break;
    case MYSQL_TYPE_DOUBLE:
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      param->length= &param->buffer_length;
      param->buffer_length= 8;
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      param->store_param_func= store_param_double;
      break;
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    case MYSQL_TYPE_TIME:
      param->store_param_func= store_param_time;
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      param->buffer_length= MAX_TIME_REP_LENGTH;
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      break;
    case MYSQL_TYPE_DATE:
      param->store_param_func= store_param_date;
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      param->buffer_length= MAX_DATE_REP_LENGTH;
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      break;
    case MYSQL_TYPE_DATETIME:
    case MYSQL_TYPE_TIMESTAMP:
      param->store_param_func= store_param_datetime;
3256
      param->buffer_length= MAX_DATETIME_REP_LENGTH;
3257
      break;
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    case MYSQL_TYPE_TINY_BLOB:
    case MYSQL_TYPE_MEDIUM_BLOB:
    case MYSQL_TYPE_LONG_BLOB:
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    case MYSQL_TYPE_BLOB:
3262
    case MYSQL_TYPE_VARCHAR:
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    case MYSQL_TYPE_VAR_STRING:
    case MYSQL_TYPE_STRING:
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    case MYSQL_TYPE_DECIMAL:
    case MYSQL_TYPE_NEWDECIMAL:
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      param->store_param_func= store_param_str;
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      /*
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        For variable length types user must set either length or
        buffer_length.
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      */
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      break;
    default:
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      strmov(stmt->sqlstate, unknown_sqlstate);
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      sprintf(stmt->last_error,
	      ER(stmt->last_errno= CR_UNSUPPORTED_PARAM_TYPE),
3277
	      param->buffer_type, count);
3278
      DBUG_RETURN(1);
3279
    }
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    /*
      If param->length is not given, change it to point to buffer_length.
      This way we can always use *param->length to get the length of data
    */
    if (!param->length)
      param->length= &param->buffer_length;
3286
  }
3287
  /* We have to send/resend type information to MySQL */
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  stmt->send_types_to_server= TRUE;
  stmt->bind_param_done= TRUE;
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  DBUG_RETURN(0);
}

3293

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/********************************************************************
 Long data implementation
*********************************************************************/

/*
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  Send long data in pieces to the server

  SYNOPSIS
3302
    mysql_stmt_send_long_data()
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    stmt			Statement handler
    param_number		Parameter number (0 - N-1)
    data			Data to send to server
    length			Length of data to send (may be 0)
3307

3308 3309 3310 3311 3312 3313 3314 3315 3316 3317 3318 3319 3320 3321 3322 3323 3324 3325 3326 3327 3328 3329 3330 3331
  DESCRIPTION
    This call can be used repeatedly to send long data in pieces
    for any string/binary placeholder. Data supplied for
    a placeholder is saved at server side till execute, and then
    used instead of value from MYSQL_BIND object. More precisely,
    if long data for a parameter was supplied, MYSQL_BIND object
    corresponding to this parameter is not sent to server. In the
    end of execution long data states of placeholders are reset,
    so next time values of such placeholders will be taken again
    from MYSQL_BIND array.
    The server does not reply to this call: if there was an error
    in data handling (which now only can happen if server run out
    of memory) it would be returned in reply to
    mysql_stmt_execute().
    You should choose type of long data carefully if you care
    about character set conversions performed by server when the
    statement is executed.  No conversion is performed at all for
    MYSQL_TYPE_BLOB and other binary typecodes. For
    MYSQL_TYPE_STRING and the rest of text placeholders data is
    converted from client character set to character set of
    connection. If these character sets are different, this
    conversion may require additional memory at server, equal to
    total size of supplied pieces.

3332
  RETURN VALUES
3333 3334
    0	ok
    1	error
3335 3336
*/

3337
my_bool STDCALL
3338
mysql_stmt_send_long_data(MYSQL_STMT *stmt, uint param_number,
3339
		     const char *data, ulong length)
3340 3341
{
  MYSQL_BIND *param;
3342
  DBUG_ENTER("mysql_stmt_send_long_data");
3343
  DBUG_ASSERT(stmt != 0);
3344
  DBUG_PRINT("enter",("param no : %d, data : %lx, length : %ld",
3345
		      param_number, data, length));
3346

3347 3348 3349 3350 3351 3352 3353 3354 3355
  /*
    We only need to check for stmt->param_count, if it's not null
    prepare was done.
  */
  if (param_number >= stmt->param_count)
  {
    set_stmt_error(stmt, CR_INVALID_PARAMETER_NO, unknown_sqlstate);
    DBUG_RETURN(1);
  }
3356

3357
  param= stmt->params+param_number;
3358 3359 3360
  if (param->buffer_type < MYSQL_TYPE_TINY_BLOB ||
      param->buffer_type > MYSQL_TYPE_STRING)
  {
3361
    /* Long data handling should be used only for string/binary types */
3362
    strmov(stmt->sqlstate, unknown_sqlstate);
3363 3364 3365 3366
    sprintf(stmt->last_error, ER(stmt->last_errno= CR_INVALID_BUFFER_USE),
	    param->param_number);
    DBUG_RETURN(1);
  }
3367

3368
  /*
3369 3370 3371
    Send long data packet if there is data or we're sending long data
    for the first time.
  */
3372
  if (length || param->long_data_used == 0)
3373
  {
3374
    MYSQL *mysql= stmt->mysql;
3375
    /* Packet header: stmt id (4 bytes), param no (2 bytes) */
3376 3377
    char buff[MYSQL_LONG_DATA_HEADER];

3378 3379
    int4store(buff, stmt->stmt_id);
    int2store(buff + 4, param_number);
3380 3381
    param->long_data_used= 1;

3382 3383 3384 3385
    /*
      Note that we don't get any ok packet from the server in this case
      This is intentional to save bandwidth.
    */
3386 3387 3388
    if ((*mysql->methods->advanced_command)(mysql, COM_STMT_SEND_LONG_DATA,
                                            buff, sizeof(buff), data,
                                            length, 1))
3389
    {
3390 3391
      set_stmt_errmsg(stmt, mysql->net.last_error,
		      mysql->net.last_errno, mysql->net.sqlstate);
3392 3393 3394 3395 3396 3397
      DBUG_RETURN(1);
    }
  }
  DBUG_RETURN(0);
}

3398

3399
/********************************************************************
3400
 Fetch and conversion of result set rows (binary protocol).
3401 3402
*********************************************************************/

3403 3404 3405 3406 3407 3408 3409 3410
/*
  Read date, (time, datetime) value from network buffer and store it
  in MYSQL_TIME structure.

  SYNOPSIS
    read_binary_{date,time,datetime}()
    tm    MYSQL_TIME structure to fill
    pos   pointer to current position in network buffer.
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3411 3412
          These functions increase pos to point to the beginning of the
          next column.
3413 3414 3415 3416 3417 3418

  Auxiliary functions to read time (date, datetime) values from network
  buffer and store in MYSQL_TIME structure. Jointly used by conversion
  and no-conversion fetching.
*/

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3419
static void read_binary_time(MYSQL_TIME *tm, uchar **pos)
3420
{
3421
  /* net_field_length will set pos to the first byte of data */
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3422 3423 3424
  uint length= net_field_length(pos);

  if (length)
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3425 3426 3427
  {
    uchar *to= *pos;
    tm->neg= (bool) to[0];
3428

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3429 3430 3431 3432 3433 3434
    tm->day=    (ulong) sint4korr(to+1);
    tm->hour=   (uint) to[5];
    tm->minute= (uint) to[6];
    tm->second= (uint) to[7];
    tm->second_part= (length > 8) ? (ulong) sint4korr(to+8) : 0;
    tm->year= tm->month= 0;
3435 3436 3437 3438 3439 3440
    if (tm->day)
    {
      /* Convert days to hours at once */
      tm->hour+= tm->day*24;
      tm->day= 0;
    }
3441 3442
    tm->time_type= MYSQL_TIMESTAMP_TIME;

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3443
    *pos+= length;
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3444
  }
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3445
  else
3446
    set_zero_time(tm, MYSQL_TIMESTAMP_TIME);
3447 3448
}

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3449
static void read_binary_datetime(MYSQL_TIME *tm, uchar **pos)
3450
{
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3451
  uint length= net_field_length(pos);
3452

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3453
  if (length)
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3454 3455
  {
    uchar *to= *pos;
3456

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3457 3458 3459 3460
    tm->neg=    0;
    tm->year=   (uint) sint2korr(to);
    tm->month=  (uint) to[2];
    tm->day=    (uint) to[3];
3461

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3462 3463 3464 3465 3466 3467 3468 3469 3470
    if (length > 4)
    {
      tm->hour=   (uint) to[4];
      tm->minute= (uint) to[5];
      tm->second= (uint) to[6];
    }
    else
      tm->hour= tm->minute= tm->second= 0;
    tm->second_part= (length > 7) ? (ulong) sint4korr(to+7) : 0;
3471
    tm->time_type= MYSQL_TIMESTAMP_DATETIME;
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3472 3473

    *pos+= length;
3474
  }
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3475
  else
3476
    set_zero_time(tm, MYSQL_TIMESTAMP_DATETIME);
3477 3478
}

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3479
static void read_binary_date(MYSQL_TIME *tm, uchar **pos)
3480
{
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3481
  uint length= net_field_length(pos);
3482

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3483
  if (length)
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3484 3485 3486 3487 3488
  {
    uchar *to= *pos;
    tm->year =  (uint) sint2korr(to);
    tm->month=  (uint) to[2];
    tm->day= (uint) to[3];
3489

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3490 3491 3492
    tm->hour= tm->minute= tm->second= 0;
    tm->second_part= 0;
    tm->neg= 0;
3493
    tm->time_type= MYSQL_TIMESTAMP_DATE;
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3494 3495

    *pos+= length;
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3496
  }
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3497
  else
3498
    set_zero_time(tm, MYSQL_TIMESTAMP_DATE);
3499 3500
}

3501

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3502 3503 3504 3505 3506 3507 3508 3509 3510
/*
  Convert string to supplied buffer of any type.

  SYNOPSIS
    fetch_string_with_conversion()
    param   output buffer descriptor
    value   column data
    length  data length
*/
3511

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3512 3513
static void fetch_string_with_conversion(MYSQL_BIND *param, char *value,
                                         uint length)
3514
{
3515
  char *buffer= (char *)param->buffer;
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3516
  int err= 0;
3517
  char *endptr= value + length;
3518

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3519 3520 3521 3522 3523
  /*
    This function should support all target buffer types: the rest
    of conversion functions can delegate conversion to it.
  */
  switch(param->buffer_type) {
3524 3525
  case MYSQL_TYPE_NULL: /* do nothing */
    break;
3526
  case MYSQL_TYPE_TINY:
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konstantin@mysql.com committed
3527
  {
3528
    longlong data= my_strtoll10(value, &endptr, &err);
3529
    *param->error= (IS_TRUNCATED(data, param->is_unsigned,
3530
                                 INT_MIN8, INT_MAX8, UINT_MAX8) || err > 0);
3531
    *buffer= (uchar) data;
3532
    break;
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konstantin@mysql.com committed
3533
  }
3534
  case MYSQL_TYPE_SHORT:
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3535
  {
3536
    longlong data= my_strtoll10(value, &endptr, &err);
3537
    *param->error= (IS_TRUNCATED(data, param->is_unsigned,
3538
                                 INT_MIN16, INT_MAX16, UINT_MAX16) || err > 0);
3539
    shortstore(buffer, (short) data);
3540
    break;
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konstantin@mysql.com committed
3541
  }
3542
  case MYSQL_TYPE_LONG:
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3543
  {
3544
    longlong data= my_strtoll10(value, &endptr, &err);
3545
    *param->error= (IS_TRUNCATED(data, param->is_unsigned,
3546
                                 INT_MIN32, INT_MAX32, UINT_MAX32) || err > 0);
3547
    longstore(buffer, (int32) data);
3548
    break;
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konstantin@mysql.com committed
3549
  }
3550
  case MYSQL_TYPE_LONGLONG:
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3551
  {
3552 3553 3554
    longlong data= my_strtoll10(value, &endptr, &err);
    *param->error= param->is_unsigned ? err != 0 :
                                       (err > 0 || (err == 0 && data < 0));
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3555
    longlongstore(buffer, data);
3556
    break;
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3557
  }
3558
  case MYSQL_TYPE_FLOAT:
3559
  {
3560 3561 3562 3563
    double data= my_strntod(&my_charset_latin1, value, length, &endptr, &err);
    float fdata= (float) data;
    *param->error= (fdata != data) | test(err);
    floatstore(buffer, fdata);
3564 3565
    break;
  }
3566
  case MYSQL_TYPE_DOUBLE:
3567
  {
3568 3569
    double data= my_strntod(&my_charset_latin1, value, length, &endptr, &err);
    *param->error= test(err);
3570
    doublestore(buffer, data);
3571 3572
    break;
  }
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3573 3574 3575 3576
  case MYSQL_TYPE_TIME:
  {
    MYSQL_TIME *tm= (MYSQL_TIME *)buffer;
    str_to_time(value, length, tm, &err);
3577
    *param->error= test(err);
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3578 3579 3580 3581
    break;
  }
  case MYSQL_TYPE_DATE:
  case MYSQL_TYPE_DATETIME:
3582
  case MYSQL_TYPE_TIMESTAMP:
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3583 3584
  {
    MYSQL_TIME *tm= (MYSQL_TIME *)buffer;
3585
    (void) str_to_datetime(value, length, tm, TIME_FUZZY_DATE, &err);
3586 3587
    *param->error= test(err) && (param->buffer_type == MYSQL_TYPE_DATE &&
                                 tm->time_type != MYSQL_TIMESTAMP_DATE);
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3588 3589 3590 3591 3592 3593
    break;
  }
  case MYSQL_TYPE_TINY_BLOB:
  case MYSQL_TYPE_MEDIUM_BLOB:
  case MYSQL_TYPE_LONG_BLOB:
  case MYSQL_TYPE_BLOB:
3594 3595
  case MYSQL_TYPE_DECIMAL:
  case MYSQL_TYPE_NEWDECIMAL:
3596
  default:
3597
  {
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konstantin@mysql.com committed
3598 3599 3600 3601 3602 3603 3604 3605 3606 3607 3608 3609 3610 3611
    /*
      Copy column data to the buffer taking into account offset,
      data length and buffer length.
    */
    char *start= value + param->offset;
    char *end= value + length;
    ulong copy_length;
    if (start < end)
    {
      copy_length= end - start;
      /* We've got some data beyond offset: copy up to buffer_length bytes */
      if (param->buffer_length)
        memcpy(buffer, start, min(copy_length, param->buffer_length));
    }
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monty@mashka.mysql.fi committed
3612
    else
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3613 3614 3615
      copy_length= 0;
    if (copy_length < param->buffer_length)
      buffer[copy_length]= '\0';
3616
    *param->error= copy_length > param->buffer_length;
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3617 3618 3619 3620
    /*
      param->length will always contain length of entire column;
      number of copied bytes may be way different:
    */
3621
    *param->length= length;
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3622
    break;
3623
  }
3624
  }
3625 3626
}

3627

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3628 3629
/*
  Convert integer value to client buffer of any type.
3630

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3631 3632 3633 3634 3635 3636
  SYNOPSIS
    fetch_long_with_conversion()
    param   output buffer descriptor
    field   column metadata
    value   column data
*/
3637

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3638
static void fetch_long_with_conversion(MYSQL_BIND *param, MYSQL_FIELD *field,
3639
                                       longlong value, my_bool is_unsigned)
3640
{
3641
  char *buffer= (char *)param->buffer;
3642

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3643
  switch (param->buffer_type) {
3644 3645
  case MYSQL_TYPE_NULL: /* do nothing */
    break;
3646
  case MYSQL_TYPE_TINY:
3647
    *param->error= IS_TRUNCATED(value, param->is_unsigned,
3648
                                INT_MIN8, INT_MAX8, UINT_MAX8);
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3649
    *(uchar *)param->buffer= (uchar) value;
3650 3651
    break;
  case MYSQL_TYPE_SHORT:
3652
    *param->error= IS_TRUNCATED(value, param->is_unsigned,
3653
                                INT_MIN16, INT_MAX16, UINT_MAX16);
3654
    shortstore(buffer, (short) value);
3655 3656
    break;
  case MYSQL_TYPE_LONG:
3657
    *param->error= IS_TRUNCATED(value, param->is_unsigned,
3658
                                INT_MIN32, INT_MAX32, UINT_MAX32);
3659
    longstore(buffer, (int32) value);
3660 3661
    break;
  case MYSQL_TYPE_LONGLONG:
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konstantin@mysql.com committed
3662
    longlongstore(buffer, value);
3663
    *param->error= param->is_unsigned != is_unsigned && value < 0;
3664 3665
    break;
  case MYSQL_TYPE_FLOAT:
3666
  {
3667 3668 3669 3670 3671 3672
    /*
      We need to store data in the buffer before the truncation check to
      workaround Intel FPU executive precision feature.
      (See http://gcc.gnu.org/bugzilla/show_bug.cgi?id=323 for details)
      AFAIU it does not guarantee to work.
    */
3673
    float data;
3674
    if (is_unsigned)
3675 3676 3677
      data= (float) ulonglong2double(value);
    else
      data= (float) value;
3678
    floatstore(buffer, data);
3679 3680 3681
    *param->error= is_unsigned ?
                   ((ulonglong) value) != ((ulonglong) (*(float*) buffer)) :
                   ((longlong) value) != ((longlong) (*(float*) buffer));
3682 3683
    break;
  }
3684
  case MYSQL_TYPE_DOUBLE:
3685
  {
3686
    double data;
3687
    if (is_unsigned)
3688 3689
      data= ulonglong2double(value);
    else
3690
      data= (double)value;
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konstantin@mysql.com committed
3691
    doublestore(buffer, data);
3692 3693 3694
    *param->error= is_unsigned ?
                   ((ulonglong) value) != ((ulonglong) (*(double*) buffer)) :
                   ((longlong) value) != ((longlong) (*(double*) buffer));
3695 3696
    break;
  }
3697 3698 3699 3700 3701 3702
  case MYSQL_TYPE_TIME:
  case MYSQL_TYPE_DATE:
  case MYSQL_TYPE_TIMESTAMP:
  case MYSQL_TYPE_DATETIME:
  {
    int error;
3703 3704
    value= number_to_datetime(value, (MYSQL_TIME *) buffer, TIME_FUZZY_DATE,
                              &error);
3705 3706 3707
    *param->error= test(error);
    break;
  }
3708
  default:
3709
  {
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konstantin@mysql.com committed
3710
    char buff[22];                              /* Enough for longlong */
3711
    char *end= longlong10_to_str(value, buff, is_unsigned ? 10: -10);
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konstantin@mysql.com committed
3712
    /* Resort to string conversion which supports all typecodes */
3713 3714 3715 3716 3717 3718 3719 3720 3721 3722
    uint length= (uint) (end-buff);

    if (field->flags & ZEROFILL_FLAG && length < field->length &&
        field->length < 21)
    {
      bmove_upp((char*) buff+field->length,buff+length, length);
      bfill((char*) buff, field->length - length,'0');
      length= field->length;
    }
    fetch_string_with_conversion(param, buff, length);
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kent@mysql.com committed
3723
    break;
3724
  }
3725
  }
3726 3727
}

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3728 3729 3730 3731 3732 3733 3734 3735 3736 3737 3738
/*
  Convert double/float column to supplied buffer of any type.

  SYNOPSIS
    fetch_float_with_conversion()
    param   output buffer descriptor
    field   column metadata
    value   column data
    width   default number of significant digits used when converting
            float/double to string
*/
3739

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3740 3741
static void fetch_float_with_conversion(MYSQL_BIND *param, MYSQL_FIELD *field,
                                        double value, int width)
3742
{
3743
  char *buffer= (char *)param->buffer;
3744
  double val64 = (value < 0 ? -floor(-value) : floor(value));
3745

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3746
  switch (param->buffer_type) {
3747 3748
  case MYSQL_TYPE_NULL: /* do nothing */
    break;
3749
  case MYSQL_TYPE_TINY:
3750 3751 3752 3753 3754 3755
    /*
      We need to _store_ data in the buffer before the truncation check to
      workaround Intel FPU executive precision feature.
      (See http://gcc.gnu.org/bugzilla/show_bug.cgi?id=323 for details)
      Sic: AFAIU it does not guarantee to work.
    */
3756
    if (param->is_unsigned)
3757
      *buffer= (uint8) value;
3758
    else
3759
      *buffer= (int8) value;
3760 3761
    *param->error= val64 != (param->is_unsigned ? (double)((uint8) *buffer) :
                                                  (double)((int8) *buffer));
3762 3763
    break;
  case MYSQL_TYPE_SHORT:
3764 3765 3766 3767 3768 3769 3770 3771 3772 3773
    if (param->is_unsigned)
    {
      ushort data= (ushort) value;
      shortstore(buffer, data);
    }
    else
    {
      short data= (short) value;
      shortstore(buffer, data);
    }
3774
    *param->error= val64 != (param->is_unsigned ? (double) (*(ushort*) buffer):
3775
                                                  (double) (*(short*) buffer));
3776 3777
    break;
  case MYSQL_TYPE_LONG:
3778 3779 3780 3781 3782 3783 3784 3785 3786 3787
    if (param->is_unsigned)
    {
      uint32 data= (uint32) value;
      longstore(buffer, data);
    }
    else
    {
      int32 data= (int32) value;
      longstore(buffer, data);
    }
3788
    *param->error= val64 != (param->is_unsigned ? (double) (*(uint32*) buffer):
3789 3790
                                                  (double) (*(int32*) buffer));
      break;
3791
  case MYSQL_TYPE_LONGLONG:
3792 3793 3794 3795 3796 3797 3798 3799 3800 3801
    if (param->is_unsigned)
    {
      ulonglong data= (ulonglong) value;
      longlongstore(buffer, data);
    }
    else
    {
      longlong data= (longlong) value;
      longlongstore(buffer, data);
    }
3802
    *param->error= val64 != (param->is_unsigned ?
3803
                             ulonglong2double(*(ulonglong*) buffer) :
3804
                             (double) (*(longlong*) buffer));
3805 3806 3807
    break;
  case MYSQL_TYPE_FLOAT:
  {
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3808
    float data= (float) value;
3809
    floatstore(buffer, data);
3810
    *param->error= (*(float*) buffer) != value;
3811 3812 3813 3814
    break;
  }
  case MYSQL_TYPE_DOUBLE:
  {
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3815
    doublestore(buffer, value);
3816 3817
    break;
  }
3818
  default:
3819
  {
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3820 3821 3822 3823 3824
    /*
      Resort to fetch_string_with_conversion: this should handle
      floating point -> string conversion nicely, honor all typecodes
      and param->offset possibly set in mysql_stmt_fetch_column
    */
3825
    char buff[MAX_DOUBLE_STRING_REP_LENGTH];
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    char *end;
    /* TODO: move this to a header shared between client and server. */
#define NOT_FIXED_DEC  31
3829
    if (field->decimals >= NOT_FIXED_DEC)
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#undef NOT_FIXED_DEC
    {
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      /*
        The 14 below is to ensure that the server and client has the same
        precisions. This will ensure that on the same machine you get the
        same value as a string independent of the protocol you use.
      */
      sprintf(buff, "%-*.*g", (int) min(sizeof(buff)-1,
                                        param->buffer_length),
	      min(14,width), value);
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      end= strcend(buff, ' ');
      *end= 0;
    }
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    else
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    {
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      sprintf(buff, "%.*f", (int) field->decimals, value);
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      end= strend(buff);
    }
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    fetch_string_with_conversion(param, buff, (uint) (end - buff));
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    break;
  }
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  }
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}

3854

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/*
  Fetch time/date/datetime to supplied buffer of any type

  SYNOPSIS
    param   output buffer descriptor
    time    column data
*/

static void fetch_datetime_with_conversion(MYSQL_BIND *param,
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                                           MYSQL_FIELD *field,
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                                           MYSQL_TIME *time)
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{
  switch (param->buffer_type) {
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  case MYSQL_TYPE_NULL: /* do nothing */
    break;
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  case MYSQL_TYPE_DATE:
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    *(MYSQL_TIME *)(param->buffer)= *time;
    *param->error= time->time_type != MYSQL_TIMESTAMP_DATE;
    break;
3874
  case MYSQL_TYPE_TIME:
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    *(MYSQL_TIME *)(param->buffer)= *time;
    *param->error= time->time_type != MYSQL_TIMESTAMP_TIME;
    break;
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  case MYSQL_TYPE_DATETIME:
  case MYSQL_TYPE_TIMESTAMP:
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    *(MYSQL_TIME *)(param->buffer)= *time;
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    /* No error: time and date are compatible with datetime */
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    break;
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  case MYSQL_TYPE_YEAR:
    shortstore(param->buffer, time->year);
    *param->error= 1;
    break;
  case MYSQL_TYPE_FLOAT:
  case MYSQL_TYPE_DOUBLE:
  {
    ulonglong value= TIME_to_ulonglong(time);
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    fetch_float_with_conversion(param, field,
                                ulonglong2double(value), DBL_DIG);
    break;
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  }
  case MYSQL_TYPE_TINY:
  case MYSQL_TYPE_SHORT:
  case MYSQL_TYPE_INT24:
  case MYSQL_TYPE_LONG:
  case MYSQL_TYPE_LONGLONG:
  {
    longlong value= (longlong) TIME_to_ulonglong(time);
3902
    fetch_long_with_conversion(param, field, value, TRUE);
3903
    break;
3904
  }
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  default:
  {
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    /*
      Convert time value  to string and delegate the rest to
      fetch_string_with_conversion:
    */
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    char buff[MAX_DATE_STRING_REP_LENGTH];
    uint length= my_TIME_to_str(time, buff);
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    /* Resort to string conversion */
    fetch_string_with_conversion(param, (char *)buff, length);
    break;
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  }
  }
}
3919

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/*
  Fetch and convert result set column to output buffer.

  SYNOPSIS
    fetch_result_with_conversion()
    param   output buffer descriptor
    field   column metadata
    row     points to a column of result set tuple in binary format

  DESCRIPTION
    This is a fallback implementation of column fetch used
    if column and output buffer types do not match.
    Increases tuple pointer to point at the next column within the
    tuple.
*/
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static void fetch_result_with_conversion(MYSQL_BIND *param, MYSQL_FIELD *field,
                                         uchar **row)
3939
{
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  enum enum_field_types field_type= field->type;
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  uint field_is_unsigned= field->flags & UNSIGNED_FLAG;
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  switch (field_type) {
  case MYSQL_TYPE_TINY:
  {
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    uchar value= **row;
    /* sic: we need to cast to 'signed char' as 'char' may be unsigned */
    longlong data= field_is_unsigned ? (longlong) value :
                                       (longlong) (signed char) value;
3950
    fetch_long_with_conversion(param, field, data, 0);
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    *row+= 1;
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    break;
  }
  case MYSQL_TYPE_SHORT:
  case MYSQL_TYPE_YEAR:
  {
3957
    short value= sint2korr(*row);
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    longlong data= field_is_unsigned ? (longlong) (unsigned short) value :
                                       (longlong) value;
3960
    fetch_long_with_conversion(param, field, data, 0);
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    *row+= 2;
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    break;
  }
3964
  case MYSQL_TYPE_INT24: /* mediumint is sent as 4 bytes int */
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  case MYSQL_TYPE_LONG:
  {
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    int32 value= sint4korr(*row);
    longlong data= field_is_unsigned ? (longlong) (uint32) value :
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                                       (longlong) value;
3970
    fetch_long_with_conversion(param, field, data, 0);
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    *row+= 4;
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    break;
  }
  case MYSQL_TYPE_LONGLONG:
  {
    longlong value= (longlong)sint8korr(*row);
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    fetch_long_with_conversion(param, field, value,
                               field->flags & UNSIGNED_FLAG);
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    *row+= 8;
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    break;
  }
  case MYSQL_TYPE_FLOAT:
  {
    float value;
    float4get(value,*row);
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    fetch_float_with_conversion(param, field, value, FLT_DIG);
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    *row+= 4;
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    break;
  }
  case MYSQL_TYPE_DOUBLE:
  {
    double value;
    float8get(value,*row);
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    fetch_float_with_conversion(param, field, value, DBL_DIG);
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    *row+= 8;
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    break;
  }
  case MYSQL_TYPE_DATE:
  {
4000
    MYSQL_TIME tm;
4001

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    read_binary_date(&tm, row);
4003
    fetch_datetime_with_conversion(param, field, &tm);
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    break;
  }
  case MYSQL_TYPE_TIME:
  {
4008
    MYSQL_TIME tm;
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    read_binary_time(&tm, row);
4011
    fetch_datetime_with_conversion(param, field, &tm);
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    break;
  }
  case MYSQL_TYPE_DATETIME:
  case MYSQL_TYPE_TIMESTAMP:
  {
    MYSQL_TIME tm;
4018

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    read_binary_datetime(&tm, row);
4020
    fetch_datetime_with_conversion(param, field, &tm);
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    break;
  }
4023
  default:
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  {
    ulong length= net_field_length(row);
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    fetch_string_with_conversion(param, (char*) *row, length);
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    *row+= length;
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    break;
  }
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  }
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}

4033

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/*
  Functions to fetch data to application buffers without conversion.

  All functions have the following characteristics:

  SYNOPSIS
    fetch_result_xxx()
    param   MySQL bind param
    pos     Row value

  DESCRIPTION
    These are no-conversion functions, used in binary protocol to store
    rows in application buffers. A function used only if type of binary data
    is compatible with type of application buffer.

  RETURN
    none
*/

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static void fetch_result_tinyint(MYSQL_BIND *param, MYSQL_FIELD *field,
                                 uchar **row)
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{
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  my_bool field_is_unsigned= test(field->flags & UNSIGNED_FLAG);
  uchar data= **row;
  *(uchar *)param->buffer= data;
4059
  *param->error= param->is_unsigned != field_is_unsigned && data > INT_MAX8;
4060
  (*row)++;
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}

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static void fetch_result_short(MYSQL_BIND *param, MYSQL_FIELD *field,
                               uchar **row)
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{
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  my_bool field_is_unsigned= test(field->flags & UNSIGNED_FLAG);
  ushort data= (ushort) sint2korr(*row);
  shortstore(param->buffer, data);
4069
  *param->error= param->is_unsigned != field_is_unsigned && data > INT_MAX16;
4070
  *row+= 2;
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}

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static void fetch_result_int32(MYSQL_BIND *param,
                               MYSQL_FIELD *field __attribute__((unused)),
                               uchar **row)
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{
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  my_bool field_is_unsigned= test(field->flags & UNSIGNED_FLAG);
  uint32 data= (uint32) sint4korr(*row);
  longstore(param->buffer, data);
4080
  *param->error= param->is_unsigned != field_is_unsigned && data > INT_MAX32;
4081
  *row+= 4;
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}

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static void fetch_result_int64(MYSQL_BIND *param,
                               MYSQL_FIELD *field __attribute__((unused)),
                               uchar **row)
4087
{
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  my_bool field_is_unsigned= test(field->flags & UNSIGNED_FLAG);
  ulonglong data= (ulonglong) sint8korr(*row);
4090
  *param->error= param->is_unsigned != field_is_unsigned && data > LONGLONG_MAX;
4091
  longlongstore(param->buffer, data);
4092
  *row+= 8;
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}

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static void fetch_result_float(MYSQL_BIND *param,
                               MYSQL_FIELD *field __attribute__((unused)),
                               uchar **row)
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{
  float value;
  float4get(value,*row);
4101
  floatstore(param->buffer, value);
4102
  *row+= 4;
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}

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static void fetch_result_double(MYSQL_BIND *param,
                                MYSQL_FIELD *field __attribute__((unused)),
                                uchar **row)
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{
  double value;
  float8get(value,*row);
4111
  doublestore(param->buffer, value);
4112
  *row+= 8;
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}

4115 4116 4117
static void fetch_result_time(MYSQL_BIND *param,
                              MYSQL_FIELD *field __attribute__((unused)),
                              uchar **row)
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{
  MYSQL_TIME *tm= (MYSQL_TIME *)param->buffer;
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  read_binary_time(tm, row);
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}

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static void fetch_result_date(MYSQL_BIND *param,
                              MYSQL_FIELD *field __attribute__((unused)),
                              uchar **row)
4126 4127
{
  MYSQL_TIME *tm= (MYSQL_TIME *)param->buffer;
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  read_binary_date(tm, row);
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}

4131 4132 4133
static void fetch_result_datetime(MYSQL_BIND *param,
                                  MYSQL_FIELD *field __attribute__((unused)),
                                  uchar **row)
4134 4135
{
  MYSQL_TIME *tm= (MYSQL_TIME *)param->buffer;
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  read_binary_datetime(tm, row);
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}

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static void fetch_result_bin(MYSQL_BIND *param,
                             MYSQL_FIELD *field __attribute__((unused)),
                             uchar **row)
4142
{
4143 4144 4145
  ulong length= net_field_length(row);
  ulong copy_length= min(length, param->buffer_length);
  memcpy(param->buffer, (char *)*row, copy_length);
4146
  *param->length= length;
4147
  *param->error= copy_length < length;
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  *row+= length;
}
4150

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static void fetch_result_str(MYSQL_BIND *param,
                             MYSQL_FIELD *field __attribute__((unused)),
                             uchar **row)
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{
  ulong length= net_field_length(row);
4156 4157
  ulong copy_length= min(length, param->buffer_length);
  memcpy(param->buffer, (char *)*row, copy_length);
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  /* Add an end null if there is room in the buffer */
  if (copy_length != param->buffer_length)
4160
    ((uchar *)param->buffer)[copy_length]= '\0';
4161
  *param->length= length;			/* return total length */
4162
  *param->error= copy_length < length;
4163
  *row+= length;
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}

4166

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/*
  functions to calculate max lengths for strings during
  mysql_stmt_store_result()
*/

static void skip_result_fixed(MYSQL_BIND *param,
			      MYSQL_FIELD *field __attribute__((unused)),
			      uchar **row)

{
  (*row)+= param->pack_length;
}


static void skip_result_with_length(MYSQL_BIND *param __attribute__((unused)),
				    MYSQL_FIELD *field __attribute__((unused)),
				    uchar **row)

{
  ulong length= net_field_length(row);
  (*row)+= length;
}


static void skip_result_string(MYSQL_BIND *param __attribute__((unused)),
			       MYSQL_FIELD *field,
			       uchar **row)

{
  ulong length= net_field_length(row);
  (*row)+= length;
  if (field->max_length < length)
    field->max_length= length;
}


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/*
  Check that two field types are binary compatible i. e.
  have equal representation in the binary protocol and
  require client-side buffers of the same type.

  SYNOPSIS
    is_binary_compatible()
    type1   parameter type supplied by user
    type2   field type, obtained from result set metadata

  RETURN
    TRUE or FALSE
*/

static my_bool is_binary_compatible(enum enum_field_types type1,
                                    enum enum_field_types type2)
{
  static const enum enum_field_types
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    range1[]= { MYSQL_TYPE_SHORT, MYSQL_TYPE_YEAR, MYSQL_TYPE_NULL },
    range2[]= { MYSQL_TYPE_INT24, MYSQL_TYPE_LONG, MYSQL_TYPE_NULL },
    range3[]= { MYSQL_TYPE_DATETIME, MYSQL_TYPE_TIMESTAMP, MYSQL_TYPE_NULL },
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    range4[]= { MYSQL_TYPE_ENUM, MYSQL_TYPE_SET, MYSQL_TYPE_TINY_BLOB,
                MYSQL_TYPE_MEDIUM_BLOB, MYSQL_TYPE_LONG_BLOB, MYSQL_TYPE_BLOB,
                MYSQL_TYPE_VAR_STRING, MYSQL_TYPE_STRING, MYSQL_TYPE_GEOMETRY,
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                MYSQL_TYPE_DECIMAL, MYSQL_TYPE_NULL };
  static const enum enum_field_types
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   *range_list[]= { range1, range2, range3, range4 },
   **range_list_end= range_list + sizeof(range_list)/sizeof(*range_list);
4231
   const enum enum_field_types **range, *type;
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  if (type1 == type2)
    return TRUE;
  for (range= range_list; range != range_list_end; ++range)
  {
    /* check that both type1 and type2 are in the same range */
    bool type1_found= FALSE, type2_found= FALSE;
4239
    for (type= *range; *type != MYSQL_TYPE_NULL; type++)
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    {
      type1_found|= type1 == *type;
      type2_found|= type2 == *type;
    }
    if (type1_found || type2_found)
      return type1_found && type2_found;
  }
  return FALSE;
}


/*
  Setup a fetch function for one column of a result set.

  SYNOPSIS
    setup_one_fetch_function()
    param    output buffer descriptor
    field    column descriptor

  DESCRIPTION
    When user binds result set buffers or when result set
    metadata is changed, we need to setup fetch (and possibly
    conversion) functions for all columns of the result set.
    In addition to that here we set up skip_result function, used
    to update result set metadata in case when
    STMT_ATTR_UPDATE_MAX_LENGTH attribute is set.
    Notice that while fetch_result is chosen depending on both
    field->type and param->type, skip_result depends on field->type
    only.

  RETURN
    TRUE   fetch function for this typecode was not found (typecode
          is not supported by the client library)
    FALSE  success
*/

static my_bool setup_one_fetch_function(MYSQL_BIND *param, MYSQL_FIELD *field)
{
  /* Setup data copy functions for the different supported types */
  switch (param->buffer_type) {
  case MYSQL_TYPE_NULL: /* for dummy binds */
    /*
      It's not binary compatible with anything the server can return:
      no need to setup fetch_result, as it'll be reset anyway
    */
    *param->length= 0;
    break;
  case MYSQL_TYPE_TINY:
    param->fetch_result= fetch_result_tinyint;
    *param->length= 1;
    break;
  case MYSQL_TYPE_SHORT:
  case MYSQL_TYPE_YEAR:
    param->fetch_result= fetch_result_short;
    *param->length= 2;
    break;
  case MYSQL_TYPE_INT24:
  case MYSQL_TYPE_LONG:
    param->fetch_result= fetch_result_int32;
    *param->length= 4;
    break;
  case MYSQL_TYPE_LONGLONG:
    param->fetch_result= fetch_result_int64;
    *param->length= 8;
    break;
  case MYSQL_TYPE_FLOAT:
    param->fetch_result= fetch_result_float;
    *param->length= 4;
    break;
  case MYSQL_TYPE_DOUBLE:
    param->fetch_result= fetch_result_double;
    *param->length= 8;
    break;
  case MYSQL_TYPE_TIME:
    param->fetch_result= fetch_result_time;
    *param->length= sizeof(MYSQL_TIME);
    break;
  case MYSQL_TYPE_DATE:
    param->fetch_result= fetch_result_date;
    *param->length= sizeof(MYSQL_TIME);
    break;
  case MYSQL_TYPE_DATETIME:
  case MYSQL_TYPE_TIMESTAMP:
    param->fetch_result= fetch_result_datetime;
    *param->length= sizeof(MYSQL_TIME);
    break;
  case MYSQL_TYPE_TINY_BLOB:
  case MYSQL_TYPE_MEDIUM_BLOB:
  case MYSQL_TYPE_LONG_BLOB:
  case MYSQL_TYPE_BLOB:
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  case MYSQL_TYPE_BIT:
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    DBUG_ASSERT(param->buffer_length != 0);
    param->fetch_result= fetch_result_bin;
    break;
  case MYSQL_TYPE_VAR_STRING:
  case MYSQL_TYPE_STRING:
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  case MYSQL_TYPE_DECIMAL:
  case MYSQL_TYPE_NEWDECIMAL:
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    DBUG_ASSERT(param->buffer_length != 0);
    param->fetch_result= fetch_result_str;
    break;
  default:
    return TRUE;
  }
  if (! is_binary_compatible(param->buffer_type, field->type))
    param->fetch_result= fetch_result_with_conversion;

  /* Setup skip_result functions (to calculate max_length) */
  param->skip_result= skip_result_fixed;
  switch (field->type) {
  case MYSQL_TYPE_NULL: /* for dummy binds */
    param->pack_length= 0;
    field->max_length= 0;
    break;
  case MYSQL_TYPE_TINY:
    param->pack_length= 1;
    field->max_length= 4;                     /* as in '-127' */
    break;
  case MYSQL_TYPE_YEAR:
  case MYSQL_TYPE_SHORT:
    param->pack_length= 2;
    field->max_length= 6;                     /* as in '-32767' */
    break;
  case MYSQL_TYPE_INT24:
    field->max_length= 9;  /* as in '16777216' or in '-8388607' */
    param->pack_length= 4;
    break;
  case MYSQL_TYPE_LONG:
    field->max_length= 11;                    /* '-2147483647' */
    param->pack_length= 4;
    break;
  case MYSQL_TYPE_LONGLONG:
    field->max_length= 21;                    /* '18446744073709551616' */
    param->pack_length= 8;
    break;
  case MYSQL_TYPE_FLOAT:
    param->pack_length= 4;
    field->max_length= MAX_DOUBLE_STRING_REP_LENGTH;
    break;
  case MYSQL_TYPE_DOUBLE:
    param->pack_length= 8;
    field->max_length= MAX_DOUBLE_STRING_REP_LENGTH;
    break;
  case MYSQL_TYPE_TIME:
    field->max_length= 15;                    /* 19:23:48.123456 */
    param->skip_result= skip_result_with_length;
  case MYSQL_TYPE_DATE:
    field->max_length= 10;                    /* 2003-11-11 */
    param->skip_result= skip_result_with_length;
    break;
    break;
  case MYSQL_TYPE_DATETIME:
  case MYSQL_TYPE_TIMESTAMP:
    param->skip_result= skip_result_with_length;
    field->max_length= MAX_DATE_STRING_REP_LENGTH;
    break;
  case MYSQL_TYPE_DECIMAL:
4397
  case MYSQL_TYPE_NEWDECIMAL:
4398 4399 4400 4401 4402 4403 4404 4405 4406
  case MYSQL_TYPE_ENUM:
  case MYSQL_TYPE_SET:
  case MYSQL_TYPE_GEOMETRY:
  case MYSQL_TYPE_TINY_BLOB:
  case MYSQL_TYPE_MEDIUM_BLOB:
  case MYSQL_TYPE_LONG_BLOB:
  case MYSQL_TYPE_BLOB:
  case MYSQL_TYPE_VAR_STRING:
  case MYSQL_TYPE_STRING:
ramil@mysql.com's avatar
ramil@mysql.com committed
4407
  case MYSQL_TYPE_BIT:
4408 4409 4410 4411 4412 4413 4414 4415 4416
    param->skip_result= skip_result_string;
    break;
  default:
    return TRUE;
  }
  return FALSE;
}


4417
/*
4418
  Setup the bind buffers for resultset processing
4419 4420
*/

4421
my_bool STDCALL mysql_stmt_bind_result(MYSQL_STMT *stmt, MYSQL_BIND *bind)
4422
{
4423
  MYSQL_BIND *param, *end;
4424
  MYSQL_FIELD *field;
4425
  ulong       bind_count= stmt->field_count;
4426
  uint        param_count= 0;
4427
  DBUG_ENTER("mysql_stmt_bind_result");
4428
  DBUG_PRINT("enter",("field_count: %d", bind_count));
4429

4430
  if (!bind_count)
4431
  {
4432 4433 4434 4435
    int errorcode= (int) stmt->state < (int) MYSQL_STMT_PREPARE_DONE ?
                   CR_NO_PREPARE_STMT : CR_NO_STMT_METADATA;
    set_stmt_error(stmt, errorcode, unknown_sqlstate);
    DBUG_RETURN(1);
4436 4437 4438 4439 4440
  }

  /*
    We only need to check that stmt->field_count - if it is not null
    stmt->bind was initialized in mysql_stmt_prepare
4441 4442 4443
    stmt->bind overlaps with bind if mysql_stmt_bind_param
    is called from mysql_stmt_store_result.
  */
4444

4445 4446
  if (stmt->bind != bind)
    memcpy((char*) stmt->bind, (char*) bind, sizeof(MYSQL_BIND) * bind_count);
4447

4448 4449 4450
  for (param= stmt->bind, end= param + bind_count, field= stmt->fields ;
       param < end ;
       param++, field++)
4451
  {
4452 4453
    DBUG_PRINT("info",("buffer_type: %u  field_type: %u",
                       (uint) param->buffer_type, (uint) field->type));
4454 4455
    /*
      Set param->is_null to point to a dummy variable if it's not set.
4456
      This is to make the execute code easier
4457 4458
    */
    if (!param->is_null)
4459
      param->is_null= &param->is_null_value;
4460

4461
    if (!param->length)
4462 4463 4464 4465
      param->length= &param->length_value;

    if (!param->error)
      param->error= &param->error_value;
4466

4467
    param->param_number= param_count++;
4468 4469
    param->offset= 0;

4470 4471
    if (setup_one_fetch_function(param, field))
    {
4472 4473
      strmov(stmt->sqlstate, unknown_sqlstate);
      sprintf(stmt->last_error,
4474 4475
              ER(stmt->last_errno= CR_UNSUPPORTED_PARAM_TYPE),
              field->type, param_count);
4476 4477
      DBUG_RETURN(1);
    }
4478
  }
4479 4480 4481 4482
  stmt->bind_result_done= BIND_RESULT_DONE;
  if (stmt->mysql->options.report_data_truncation)
    stmt->bind_result_done|= REPORT_DATA_TRUNCATION;

4483 4484 4485
  DBUG_RETURN(0);
}

4486

4487
/*
4488
  Fetch row data to bind buffers
4489 4490
*/

4491
static int stmt_fetch_row(MYSQL_STMT *stmt, uchar *row)
4492
{
4493
  MYSQL_BIND  *bind, *end;
4494
  MYSQL_FIELD *field;
4495
  uchar *null_ptr, bit;
4496
  int truncation_count= 0;
4497 4498 4499 4500 4501 4502
  /*
    Precondition: if stmt->field_count is zero or row is NULL, read_row_*
    function must return no data.
  */
  DBUG_ASSERT(stmt->field_count);
  DBUG_ASSERT(row);
4503

4504 4505 4506
  if (!stmt->bind_result_done)
  {
    /* If output parameters were not bound we should just return success */
4507
    return 0;
4508
  }
4509 4510

  null_ptr= row;
4511 4512
  row+= (stmt->field_count+9)/8;		/* skip null bits */
  bit= 4;					/* first 2 bits are reserved */
4513

venu@myvenu.com's avatar
venu@myvenu.com committed
4514
  /* Copy complete row to application buffers */
4515 4516
  for (bind= stmt->bind, end= bind + stmt->field_count, field= stmt->fields ;
       bind < end ;
4517
       bind++, field++)
4518
  {
4519
    *bind->error= 0;
4520
    if (*null_ptr & bit)
4521 4522
    {
      /*
4523
        We should set both row_ptr and is_null to be able to see
4524 4525 4526 4527 4528
        nulls in mysql_stmt_fetch_column. This is because is_null may point
        to user data which can be overwritten between mysql_stmt_fetch and
        mysql_stmt_fetch_column, and in this case nullness of column will be
        lost. See mysql_stmt_fetch_column for details.
      */
4529
      bind->row_ptr= NULL;
4530 4531
      *bind->is_null= 1;
    }
4532
    else
4533
    {
4534
      *bind->is_null= 0;
4535 4536 4537
      bind->row_ptr= row;
      (*bind->fetch_result)(bind, field, &row);
      truncation_count+= *bind->error;
4538
    }
4539
    if (!((bit<<=1) & 255))
4540
    {
4541
      bit= 1;					/* To next byte */
4542
      null_ptr++;
4543 4544
    }
  }
4545 4546
  if (truncation_count && (stmt->bind_result_done & REPORT_DATA_TRUNCATION))
    return MYSQL_DATA_TRUNCATED;
4547 4548 4549
  return 0;
}

4550

4551
int cli_unbuffered_fetch(MYSQL *mysql, char **row)
hf@deer.(none)'s avatar
SCRUM  
hf@deer.(none) committed
4552 4553 4554 4555
{
  if (packet_error == net_safe_read(mysql))
    return 1;

4556 4557
  *row= ((mysql->net.read_pos[0] == 254) ? NULL :
	 (char*) (mysql->net.read_pos+1));
hf@deer.(none)'s avatar
SCRUM  
hf@deer.(none) committed
4558 4559
  return 0;
}
4560

4561

4562
/*
4563
  Fetch and return row data to bound buffers, if any
4564 4565
*/

4566
int STDCALL mysql_stmt_fetch(MYSQL_STMT *stmt)
4567
{
4568
  int rc;
4569
  uchar *row;
4570
  DBUG_ENTER("mysql_stmt_fetch");
4571

4572
  if ((rc= (*stmt->read_row_func)(stmt, &row)) ||
4573
      ((rc= stmt_fetch_row(stmt, row)) && rc != MYSQL_DATA_TRUNCATED))
4574
  {
4575
    stmt->state= MYSQL_STMT_PREPARE_DONE;       /* XXX: this is buggy */
4576 4577
    stmt->read_row_func= (rc == MYSQL_NO_DATA) ? 
      stmt_read_row_no_data : stmt_read_row_no_result_set;
4578
  }
4579
  else
4580
  {
4581 4582
    /* This is to know in mysql_stmt_fetch_column that data was fetched */
    stmt->state= MYSQL_STMT_FETCH_DONE;
hf@deer.(none)'s avatar
SCRUM  
hf@deer.(none) committed
4583
  }
4584
  DBUG_RETURN(rc);
4585 4586
}

4587

4588
/*
4589
  Fetch data for one specified column data
monty@mashka.mysql.fi's avatar
monty@mashka.mysql.fi committed
4590 4591

  SYNOPSIS
4592
    mysql_stmt_fetch_column()
monty@mashka.mysql.fi's avatar
monty@mashka.mysql.fi committed
4593
    stmt		Prepared statement handler
4594
    bind		Where data should be placed. Should be filled in as
4595
			when calling mysql_stmt_bind_result()
monty@mashka.mysql.fi's avatar
monty@mashka.mysql.fi committed
4596 4597 4598
    column		Column to fetch (first column is 0)
    ulong offset	Offset in result data (to fetch blob in pieces)
			This is normally 0
4599
  RETURN
monty@mashka.mysql.fi's avatar
monty@mashka.mysql.fi committed
4600 4601
    0	ok
    1	error
4602 4603
*/

4604
int STDCALL mysql_stmt_fetch_column(MYSQL_STMT *stmt, MYSQL_BIND *bind,
4605
                                    uint column, ulong offset)
4606
{
4607
  MYSQL_BIND *param= stmt->bind+column;
4608
  DBUG_ENTER("mysql_stmt_fetch_column");
4609

4610 4611 4612 4613 4614 4615 4616 4617 4618 4619 4620
  if ((int) stmt->state < (int) MYSQL_STMT_FETCH_DONE)
  {
    set_stmt_error(stmt, CR_NO_DATA, unknown_sqlstate);
    return 1;
  }
  if (column >= stmt->field_count)
  {
    set_stmt_error(stmt, CR_INVALID_PARAMETER_NO, unknown_sqlstate);
    DBUG_RETURN(1);
  }

4621 4622 4623 4624
  if (!bind->error)
    bind->error= &bind->error_value;
  *bind->error= 0;
  if (param->row_ptr)
4625
  {
4626
    MYSQL_FIELD *field= stmt->fields+column;
4627
    uchar *row= param->row_ptr;
4628 4629 4630 4631
    bind->offset= offset;
    if (bind->is_null)
      *bind->is_null= 0;
    if (bind->length) /* Set the length if non char/binary types */
monty@mashka.mysql.fi's avatar
monty@mashka.mysql.fi committed
4632
      *bind->length= *param->length;
4633
    else
4634
      bind->length= &param->length_value;       /* Needed for fetch_result() */
konstantin@mysql.com's avatar
konstantin@mysql.com committed
4635
    fetch_result_with_conversion(bind, field, &row);
4636
  }
4637 4638 4639 4640 4641
  else
  {
    if (bind->is_null)
      *bind->is_null= 1;
  }
4642 4643 4644 4645
  DBUG_RETURN(0);
}


4646
/*
4647 4648 4649
  Read all rows of data from server  (binary format)
*/

4650
int cli_read_binary_rows(MYSQL_STMT *stmt)
4651 4652 4653 4654
{
  ulong      pkt_len;
  uchar      *cp;
  MYSQL      *mysql= stmt->mysql;
4655 4656
  MYSQL_DATA *result= &stmt->result;
  MYSQL_ROWS *cur, **prev_ptr= &result->data;
4657
  NET        *net = &mysql->net;
4658
  DBUG_ENTER("cli_read_binary_rows");
4659

4660
  mysql= mysql->last_used_con;
4661

4662
  while ((pkt_len= net_safe_read(mysql)) != packet_error)
4663
  {
4664 4665
    cp= net->read_pos;
    if (cp[0] != 254 || pkt_len >= 8)
4666
    {
4667 4668 4669 4670
      if (!(cur= (MYSQL_ROWS*) alloc_root(&result->alloc,
                                          sizeof(MYSQL_ROWS) + pkt_len - 1)))
      {
        set_stmt_error(stmt, CR_OUT_OF_MEMORY, unknown_sqlstate);
4671
        goto err;
4672 4673 4674 4675 4676
      }
      cur->data= (MYSQL_ROW) (cur+1);
      *prev_ptr= cur;
      prev_ptr= &cur->next;
      memcpy((char *) cur->data, (char *) cp+1, pkt_len-1);
4677 4678
      cur->length= pkt_len;		/* To allow us to do sanity checks */
      result->rows++;
4679
    }
4680
    else
4681
    {
4682 4683 4684 4685
      /* end of data */
      *prev_ptr= 0;
      mysql->warning_count= uint2korr(cp+1);
      mysql->server_status= uint2korr(cp+3);
4686 4687
      DBUG_PRINT("info",("status: %u  warning_count: %u",
                         mysql->server_status, mysql->warning_count));
4688 4689 4690
      DBUG_RETURN(0);
    }
  }
4691
  set_stmt_errmsg(stmt, net->last_error, net->last_errno, net->sqlstate);
4692 4693

err:
4694
  DBUG_RETURN(1);
4695 4696
}

4697

4698 4699 4700 4701 4702 4703 4704 4705 4706 4707 4708 4709 4710 4711 4712 4713 4714 4715 4716 4717 4718 4719 4720 4721 4722 4723
/*
  Update meta data for statement

  SYNOPSIS
    stmt_update_metadata()
    stmt			Statement handler
    row				Binary data

  NOTES
    Only updates MYSQL_FIELD->max_length for strings
*/

static void stmt_update_metadata(MYSQL_STMT *stmt, MYSQL_ROWS *data)
{
  MYSQL_BIND  *bind, *end;
  MYSQL_FIELD *field;
  uchar *null_ptr, bit;
  uchar *row= (uchar*) data->data;
#ifndef DBUG_OFF
  uchar *row_end= row + data->length;
#endif

  null_ptr= row;
  row+= (stmt->field_count+9)/8;		/* skip null bits */
  bit= 4;					/* first 2 bits are reserved */

4724
  /* Go through all fields and calculate metadata */
4725 4726 4727 4728 4729 4730 4731 4732 4733 4734 4735 4736 4737 4738 4739 4740
  for (bind= stmt->bind, end= bind + stmt->field_count, field= stmt->fields ;
       bind < end ;
       bind++, field++)
  {
    if (!(*null_ptr & bit))
      (*bind->skip_result)(bind, field, &row);
    DBUG_ASSERT(row <= row_end);
    if (!((bit<<=1) & 255))
    {
      bit= 1;					/* To next byte */
      null_ptr++;
    }
  }
}


4741 4742 4743 4744 4745 4746 4747
/*
  Store or buffer the binary results to stmt
*/

int STDCALL mysql_stmt_store_result(MYSQL_STMT *stmt)
{
  MYSQL *mysql= stmt->mysql;
4748
  MYSQL_DATA *result= &stmt->result;
4749
  DBUG_ENTER("mysql_stmt_store_result");
4750 4751 4752 4753 4754

  mysql= mysql->last_used_con;

  if (!stmt->field_count)
    DBUG_RETURN(0);
4755 4756
  if ((int) stmt->state < (int) MYSQL_STMT_EXECUTE_DONE ||
      mysql->status != MYSQL_STATUS_GET_RESULT)
4757
  {
4758
    set_stmt_error(stmt, CR_COMMANDS_OUT_OF_SYNC, unknown_sqlstate);
4759
    DBUG_RETURN(1);
4760
  }
4761
  if (result->data)
4762
  {
4763 4764 4765 4766
    free_root(&result->alloc, MYF(MY_KEEP_PREALLOC));
    result->data= NULL;
    result->rows= 0;
    stmt->data_cursor= NULL;
4767
  }
4768 4769 4770 4771 4772 4773 4774 4775 4776 4777 4778 4779 4780 4781 4782

  if (stmt->update_max_length && !stmt->bind_result_done)
  {
    /*
      We must initalize the bind structure to be able to calculate
      max_length
    */
    MYSQL_BIND  *bind, *end;
    MYSQL_FIELD *field;
    bzero((char*) stmt->bind, sizeof(*stmt->bind)* stmt->field_count);

    for (bind= stmt->bind, end= bind + stmt->field_count, field= stmt->fields;
	 bind < end ;
	 bind++, field++)
    {
4783
      bind->buffer_type= MYSQL_TYPE_NULL;
4784 4785 4786
      bind->buffer_length=1;
    }

4787 4788
    if (mysql_stmt_bind_result(stmt, stmt->bind))
      DBUG_RETURN(1);
4789 4790 4791
    stmt->bind_result_done= 0;			/* No normal bind done */
  }

4792
  if ((*mysql->methods->read_binary_rows)(stmt))
4793
  {
4794 4795 4796
    free_root(&result->alloc, MYF(MY_KEEP_PREALLOC));
    result->data= NULL;
    result->rows= 0;
4797
    mysql->status= MYSQL_STATUS_READY;
4798
    DBUG_RETURN(1);
4799
  }
4800

4801 4802 4803 4804 4805 4806 4807
  if (stmt->update_max_length)
  {
    MYSQL_ROWS *cur= result->data;
    for(; cur; cur=cur->next)
      stmt_update_metadata(stmt, cur);
  }

4808 4809
  stmt->data_cursor= result->data;
  mysql->affected_rows= stmt->affected_rows= result->rows;
4810 4811 4812
  stmt->read_row_func= stmt_read_row_buffered;
  mysql->unbuffered_fetch_owner= 0;             /* set in stmt_execute */
  mysql->status= MYSQL_STATUS_READY;		/* server is ready */
4813
  DBUG_RETURN(0); /* Data buffered, must be fetched with mysql_stmt_fetch() */
4814 4815
}

4816

4817 4818 4819 4820 4821 4822 4823
/*
  Seek to desired row in the statement result set
*/

MYSQL_ROW_OFFSET STDCALL
mysql_stmt_row_seek(MYSQL_STMT *stmt, MYSQL_ROW_OFFSET row)
{
4824
  MYSQL_ROW_OFFSET offset= stmt->data_cursor;
4825
  DBUG_ENTER("mysql_stmt_row_seek");
4826

4827 4828
  stmt->data_cursor= row;
  DBUG_RETURN(offset);
4829 4830
}

4831

4832 4833 4834 4835
/*
  Return the current statement row cursor position
*/

4836
MYSQL_ROW_OFFSET STDCALL
4837 4838 4839
mysql_stmt_row_tell(MYSQL_STMT *stmt)
{
  DBUG_ENTER("mysql_stmt_row_tell");
4840

4841
  DBUG_RETURN(stmt->data_cursor);
4842 4843
}

4844

4845 4846 4847 4848 4849 4850 4851
/*
  Move the stmt result set data cursor to specified row
*/

void STDCALL
mysql_stmt_data_seek(MYSQL_STMT *stmt, my_ulonglong row)
{
4852
  MYSQL_ROWS *tmp= stmt->result.data;
4853 4854
  DBUG_ENTER("mysql_stmt_data_seek");
  DBUG_PRINT("enter",("row id to seek: %ld",(long) row));
4855

4856 4857 4858
  for (; tmp && row; --row, tmp= tmp->next)
    ;
  stmt->data_cursor= tmp;
4859 4860 4861 4862 4863 4864
  if (!row && tmp)
  {
       /*  Rewind the counter */
    stmt->read_row_func= stmt_read_row_buffered;
    stmt->state= MYSQL_STMT_EXECUTE_DONE;
  }
4865
  DBUG_VOID_RETURN;
4866 4867
}

4868

4869 4870 4871 4872 4873 4874 4875
/*
  Return total rows the current statement result set
*/

my_ulonglong STDCALL mysql_stmt_num_rows(MYSQL_STMT *stmt)
{
  DBUG_ENTER("mysql_stmt_num_rows");
4876

4877
  DBUG_RETURN(stmt->result.rows);
4878
}
4879

4880

4881 4882 4883 4884 4885
/*
  Free the client side memory buffers, reset long data state
  on client if necessary, and reset the server side statement if
  this has been requested.
*/
4886

4887 4888 4889
static my_bool reset_stmt_handle(MYSQL_STMT *stmt, uint flags)
{
  /* If statement hasn't been prepared there is nothing to reset */
4890 4891 4892
  if ((int) stmt->state > (int) MYSQL_STMT_INIT_DONE)
  {
    MYSQL *mysql= stmt->mysql;
4893
    MYSQL_DATA *result= &stmt->result;
4894

4895 4896 4897 4898
    /*
      Reset stored result set if so was requested or it's a part
      of cursor fetch.
    */
4899
    if (result->data && (flags & RESET_STORE_RESULT))
4900 4901
    {
      /* Result buffered */
4902 4903 4904 4905
      free_root(&result->alloc, MYF(MY_KEEP_PREALLOC));
      result->data= NULL;
      result->rows= 0;
      stmt->data_cursor= NULL;
4906
    }
4907
    if (flags & RESET_LONG_DATA)
4908
    {
4909 4910 4911 4912 4913
      MYSQL_BIND *param= stmt->params, *param_end= param + stmt->param_count;
      /* Clear long_data_used flags */
      for (; param < param_end; param++)
        param->long_data_used= 0;
    }
4914
    stmt->read_row_func= stmt_read_row_no_result_set;
4915 4916 4917
    if (mysql)
    {
      if ((int) stmt->state > (int) MYSQL_STMT_PREPARE_DONE)
4918
      {
4919 4920 4921 4922 4923 4924 4925 4926 4927 4928 4929
        if (mysql->unbuffered_fetch_owner == &stmt->unbuffered_fetch_cancelled)
          mysql->unbuffered_fetch_owner= 0;
        if (stmt->field_count && mysql->status != MYSQL_STATUS_READY)
        {
          /* There is a result set and it belongs to this statement */
          (*mysql->methods->flush_use_result)(mysql);
          if (mysql->unbuffered_fetch_owner)
            *mysql->unbuffered_fetch_owner= TRUE;
          mysql->status= MYSQL_STATUS_READY;
        }
      }
4930
      if (flags & RESET_SERVER_SIDE)
4931 4932 4933 4934 4935 4936 4937
      {
        /*
          Reset the server side statement and close the server side
          cursor if it exists.
        */
        char buff[MYSQL_STMT_HEADER]; /* packet header: 4 bytes for stmt id */
        int4store(buff, stmt->stmt_id);
4938
        if ((*mysql->methods->advanced_command)(mysql, COM_STMT_RESET, buff,
4939 4940 4941 4942 4943 4944 4945
                                                sizeof(buff), 0, 0, 0))
        {
          set_stmt_errmsg(stmt, mysql->net.last_error, mysql->net.last_errno,
                          mysql->net.sqlstate);
          stmt->state= MYSQL_STMT_INIT_DONE;
          return 1;
        }
4946
        stmt_clear_error(stmt);
4947 4948 4949 4950
      }
    }
    stmt->state= MYSQL_STMT_PREPARE_DONE;
  }
4951 4952 4953 4954 4955 4956 4957 4958
  return 0;
}

my_bool STDCALL mysql_stmt_free_result(MYSQL_STMT *stmt)
{
  DBUG_ENTER("mysql_stmt_free_result");

  /* Free the client side and close the server side cursor if there is one */
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  DBUG_RETURN(reset_stmt_handle(stmt, RESET_LONG_DATA | RESET_STORE_RESULT));
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}

4962
/********************************************************************
4963
 statement error handling and close
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*********************************************************************/
4965

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/*
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  Close the statement handle by freeing all alloced resources
4968

4969
  SYNOPSIS
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    mysql_stmt_close()
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    stmt	       Statement handle
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  RETURN VALUES
    0	ok
    1	error
*/
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my_bool STDCALL mysql_stmt_close(MYSQL_STMT *stmt)
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{
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  MYSQL *mysql= stmt->mysql;
  int rc= 0;
  DBUG_ENTER("mysql_stmt_close");
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  free_root(&stmt->result.alloc, MYF(0));
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  free_root(&stmt->mem_root, MYF(0));

  if (mysql)
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  {
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    mysql->stmts= list_delete(mysql->stmts, &stmt->list);
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    /*
      Clear NET error state: if the following commands come through
      successfully, connection will still be usable for other commands.
    */
    net_clear_error(&mysql->net);
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    if ((int) stmt->state > (int) MYSQL_STMT_INIT_DONE)
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    {
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      char buff[MYSQL_STMT_HEADER];             /* 4 bytes - stmt id */
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      if (mysql->unbuffered_fetch_owner == &stmt->unbuffered_fetch_cancelled)
        mysql->unbuffered_fetch_owner= 0;
      if (mysql->status != MYSQL_STATUS_READY)
      {
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        /*
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          Flush result set of the connection. If it does not belong
          to this statement, set a warning.
        */
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        (*mysql->methods->flush_use_result)(mysql);
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        if (mysql->unbuffered_fetch_owner)
          *mysql->unbuffered_fetch_owner= TRUE;
        mysql->status= MYSQL_STATUS_READY;
      }
      int4store(buff, stmt->stmt_id);
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      if ((rc= simple_command(mysql, COM_STMT_CLOSE, buff, 4, 1)))
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      {
        set_stmt_errmsg(stmt, mysql->net.last_error, mysql->net.last_errno,
                        mysql->net.sqlstate);
      }
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    }
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  }
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  my_free((gptr) stmt, MYF(MY_WME));
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  DBUG_RETURN(test(rc));
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}

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/*
  Reset the statement buffers in server
*/

my_bool STDCALL mysql_stmt_reset(MYSQL_STMT *stmt)
{
  DBUG_ENTER("mysql_stmt_reset");
  DBUG_ASSERT(stmt != 0);
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  if (!stmt->mysql)
  {
    /* mysql can be reset in mysql_close called from mysql_reconnect */
    set_stmt_error(stmt, CR_SERVER_LOST, unknown_sqlstate);
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    DBUG_RETURN(1);
  }
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  /* Reset the client and server sides of the prepared statement */
  DBUG_RETURN(reset_stmt_handle(stmt, RESET_SERVER_SIDE | RESET_LONG_DATA));
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}

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/*
  Return statement error code
*/

uint STDCALL mysql_stmt_errno(MYSQL_STMT * stmt)
{
  DBUG_ENTER("mysql_stmt_errno");
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  DBUG_RETURN(stmt->last_errno);
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}

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const char *STDCALL mysql_stmt_sqlstate(MYSQL_STMT * stmt)
{
  DBUG_ENTER("mysql_stmt_sqlstate");
  DBUG_RETURN(stmt->sqlstate);
}

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/*
  Return statement error message
*/

const char *STDCALL mysql_stmt_error(MYSQL_STMT * stmt)
{
  DBUG_ENTER("mysql_stmt_error");
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  DBUG_RETURN(stmt->last_error);
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}

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/********************************************************************
 Transactional APIs
*********************************************************************/

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/*
  Commit the current transaction
*/

5079
my_bool STDCALL mysql_commit(MYSQL * mysql)
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{
  DBUG_ENTER("mysql_commit");
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  DBUG_RETURN((my_bool) mysql_real_query(mysql, "commit", 6));
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}

/*
5086
  Rollback the current transaction
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*/

5089
my_bool STDCALL mysql_rollback(MYSQL * mysql)
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{
  DBUG_ENTER("mysql_rollback");
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  DBUG_RETURN((my_bool) mysql_real_query(mysql, "rollback", 8));
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}


/*
  Set autocommit to either true or false
*/

5100
my_bool STDCALL mysql_autocommit(MYSQL * mysql, my_bool auto_mode)
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{
  DBUG_ENTER("mysql_autocommit");
  DBUG_PRINT("enter", ("mode : %d", auto_mode));

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  DBUG_RETURN((my_bool) mysql_real_query(mysql, auto_mode ?
                                         "set autocommit=1":"set autocommit=0",
                                         16));
5108
}
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/********************************************************************
5112
 Multi query execution + SPs APIs
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*********************************************************************/

/*
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  Returns true/false to indicate whether any more query results exist
  to be read using mysql_next_result()
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*/

my_bool STDCALL mysql_more_results(MYSQL *mysql)
{
5122
  my_bool res;
5123
  DBUG_ENTER("mysql_more_results");
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  res= ((mysql->last_used_con->server_status & SERVER_MORE_RESULTS_EXISTS) ?
5126
	1: 0);
5127
  DBUG_PRINT("exit",("More results exists ? %d", res));
5128
  DBUG_RETURN(res);
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}

5131

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/*
  Reads and returns the next query results
*/
5135
int STDCALL mysql_next_result(MYSQL *mysql)
5136
{
5137
  DBUG_ENTER("mysql_next_result");
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  if (mysql->status != MYSQL_STATUS_READY)
  {
    strmov(mysql->net.sqlstate, unknown_sqlstate);
    strmov(mysql->net.last_error,
	   ER(mysql->net.last_errno=CR_COMMANDS_OUT_OF_SYNC));
    DBUG_RETURN(1);
  }

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  mysql->net.last_error[0]= 0;
  mysql->net.last_errno= 0;
5149
  strmov(mysql->net.sqlstate, not_error_sqlstate);
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  mysql->affected_rows= ~(my_ulonglong) 0;

  if (mysql->last_used_con->server_status & SERVER_MORE_RESULTS_EXISTS)
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    DBUG_RETURN((*mysql->methods->next_result)(mysql));

5155
  DBUG_RETURN(-1);				/* No more results */
5156
}
hf@deer.(none)'s avatar
hf@deer.(none) committed
5157

5158

hf@deer.(none)'s avatar
hf@deer.(none) committed
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MYSQL_RES * STDCALL mysql_use_result(MYSQL *mysql)
{
  return (*mysql->methods->use_result)(mysql);
}

my_bool STDCALL mysql_read_query_result(MYSQL *mysql)
{
  return (*mysql->methods->read_query_result)(mysql);
}