sql_table.cc 65 KB
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/* Copyright (C) 2000-2003 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
   the Free Software Foundation; either version 2 of the License, or
   (at your option) any later version.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   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 */


/* drop and alter of tables */

#include "mysql_priv.h"
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#ifdef HAVE_BERKELEY_DB
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#include "ha_berkeley.h"
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#endif
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#include <hash.h>
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#include <myisam.h>
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#include <my_dir.h>
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#include <assert.h>
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#ifdef __WIN__
#include <io.h>
#endif

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#include "sql_acl.h" // for SUPER_ACL

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extern HASH open_cache;
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static const char *primary_key_name="PRIMARY";
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static bool check_if_keyname_exists(const char *name,KEY *start, KEY *end);
static char *make_unique_key_name(const char *field_name,KEY *start,KEY *end);
static int copy_data_between_tables(TABLE *from,TABLE *to,
				    List<create_field> &create,
				    enum enum_duplicates handle_duplicates,
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                                    ORDER *order,
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				    ha_rows *copied,ha_rows *deleted);
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/*
 delete (drop) tables.

  SYNOPSIS
   mysql_rm_table()
   thd			Thread handle
   tables		List of tables to delete
   if_exists		If 1, don't give error if one table doesn't exists

  NOTES
    Will delete all tables that can be deleted and give a compact error
    messages for tables that could not be deleted.
    If a table is in use, we will wait for all users to free the table
    before dropping it

    Wait if global_read_lock (FLUSH TABLES WITH READ LOCK) is set.

  RETURN
    0		ok.  In this case ok packet is sent to user
    -1		Error  (Error message given but not sent to user)

*/
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int mysql_rm_table(THD *thd,TABLE_LIST *tables, my_bool if_exists)
{
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  int error= 0;
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  DBUG_ENTER("mysql_rm_table");

  /* mark for close and remove all cached entries */

  thd->mysys_var->current_mutex= &LOCK_open;
  thd->mysys_var->current_cond= &COND_refresh;
  VOID(pthread_mutex_lock(&LOCK_open));

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  if (global_read_lock)
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  {
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    if (thd->global_read_lock)
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    {
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      my_error(ER_TABLE_NOT_LOCKED_FOR_WRITE,MYF(0),
	       tables->real_name);
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      error= 1;
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      goto err;
    }
    while (global_read_lock && ! thd->killed)
    {
      (void) pthread_cond_wait(&COND_refresh,&LOCK_open);
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    }
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  }
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  error=mysql_rm_table_part2(thd,tables,if_exists,0);

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 err:
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  pthread_mutex_unlock(&LOCK_open);

  pthread_mutex_lock(&thd->mysys_var->mutex);
  thd->mysys_var->current_mutex= 0;
  thd->mysys_var->current_cond= 0;
  pthread_mutex_unlock(&thd->mysys_var->mutex);

  if (error)
    DBUG_RETURN(-1);
  send_ok(&thd->net);
  DBUG_RETURN(0);
}

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/*
 delete (drop) tables.

  SYNOPSIS
   mysql_rm_table_part2_with_lock()
   thd			Thread handle
   tables		List of tables to delete
   if_exists		If 1, don't give error if one table doesn't exists
   dont_log_query	Don't write query to log files

 NOTES
   Works like documented in mysql_rm_table(), but don't check
   global_read_lock and don't send_ok packet to server.

 RETURN
  0	ok
  1	error
*/

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int mysql_rm_table_part2_with_lock(THD *thd,
				   TABLE_LIST *tables, bool if_exists,
				   bool dont_log_query)
{
  int error;
  thd->mysys_var->current_mutex= &LOCK_open;
  thd->mysys_var->current_cond= &COND_refresh;
  VOID(pthread_mutex_lock(&LOCK_open));

  error=mysql_rm_table_part2(thd,tables, if_exists, dont_log_query);

  pthread_mutex_unlock(&LOCK_open);

  pthread_mutex_lock(&thd->mysys_var->mutex);
  thd->mysys_var->current_mutex= 0;
  thd->mysys_var->current_cond= 0;
  pthread_mutex_unlock(&thd->mysys_var->mutex);
  return error;
}

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/*
  TODO:
    When logging to the binary log, we should log
    tmp_tables and transactional tables as separate statements if we
    are in a transaction;  This is needed to get these tables into the
    cached binary log that is only written on COMMIT.

   The current code only writes DROP statements that only uses temporary
   tables to the cache binary log.  This should be ok on most cases, but
   not all.
*/
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int mysql_rm_table_part2(THD *thd, TABLE_LIST *tables, bool if_exists,
			 bool dont_log_query)
{
  TABLE_LIST *table;
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  char	path[FN_REFLEN], *alias;
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  String wrong_tables;
  db_type table_type;
  int error;
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  bool some_tables_deleted=0, tmp_table_deleted=0, foreign_key_error=0;
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  DBUG_ENTER("mysql_rm_table_part2");

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  if (lock_table_names(thd, tables))
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    DBUG_RETURN(1);
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  for (table=tables ; table ; table=table->next)
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  {
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    char *db=table->db;
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    mysql_ha_flush(thd, table, MYSQL_HA_CLOSE_FINAL);
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    if (!close_temporary_table(thd, db, table->real_name))
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    {
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      tmp_table_deleted=1;
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      continue;					// removed temporary table
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    }
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    abort_locked_tables(thd,db,table->real_name);
    while (remove_table_from_cache(thd,db,table->real_name) && !thd->killed)
    {
      dropping_tables++;
      (void) pthread_cond_wait(&COND_refresh,&LOCK_open);
      dropping_tables--;
    }
    drop_locked_tables(thd,db,table->real_name);
    if (thd->killed)
      DBUG_RETURN(-1);
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    alias= (lower_case_table_names == 2) ? table->alias : table->real_name;
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    /* remove form file and isam files */
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    strxmov(path, mysql_data_home, "/", db, "/", alias, reg_ext, NullS);
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    (void) unpack_filename(path,path);
    error=0;

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    if (access(path,F_OK))
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    {
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      if (!if_exists)
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	error=1;
    }
    else
    {
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      char *end;
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      table_type= get_table_type(path);
      *(end=fn_ext(path))=0;			// Remove extension for delete
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      error=ha_delete_table(table_type, path);
      if (error == ENOENT && if_exists)
	error = 0;
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      if (error == HA_ERR_ROW_IS_REFERENCED)
        foreign_key_error=1;	/* the table is referenced by a foreign key
				constraint */
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      if (!error || error == ENOENT)
      {
	/* Delete the table definition file */
	strmov(end,reg_ext);
	if (!(error=my_delete(path,MYF(MY_WME))))
	  some_tables_deleted=1;
      }
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    }
    if (error)
    {
      if (wrong_tables.length())
	wrong_tables.append(',');
      wrong_tables.append(String(table->real_name));
    }
  }
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  error= 0;
  if (wrong_tables.length())
  {
    if (!foreign_key_error)
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      my_printf_error(ER_BAD_TABLE_ERROR, ER(ER_BAD_TABLE_ERROR), MYF(0),
                      wrong_tables.c_ptr());
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    else
      my_error(ER_ROW_IS_REFERENCED,MYF(0));
    error= 1;
  }

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  if (some_tables_deleted || tmp_table_deleted)
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  {
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    query_cache_invalidate3(thd, tables, 0);
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    if (!dont_log_query)
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    {
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      mysql_update_log.write(thd, thd->query,thd->query_length);
      if (mysql_bin_log.is_open())
      {
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        if (!error)
          thd->clear_error();
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	Query_log_event qinfo(thd, thd->query, thd->query_length,
			      tmp_table_deleted && !some_tables_deleted);
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	mysql_bin_log.write(&qinfo);
      }
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    }
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  }
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  unlock_table_names(thd, tables);
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  DBUG_RETURN(error);
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}


int quick_rm_table(enum db_type base,const char *db,
		   const char *table_name)
{
  char path[FN_REFLEN];
  int error=0;
  (void) sprintf(path,"%s/%s/%s%s",mysql_data_home,db,table_name,reg_ext);
  unpack_filename(path,path);
  if (my_delete(path,MYF(0)))
    error=1; /* purecov: inspected */
  sprintf(path,"%s/%s/%s",mysql_data_home,db,table_name);
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  unpack_filename(path,path);
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  return ha_delete_table(base,path) || error;
}

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/*
  Sort keys in the following order:
  - PRIMARY KEY
  - UNIQUE keyws where all column are NOT NULL
  - Other UNIQUE keys
  - Normal keys
  - Fulltext keys

  This will make checking for duplicated keys faster and ensure that
  PRIMARY keys are prioritized.
*/


static int sort_keys(KEY *a, KEY *b)
{
  if (a->flags & HA_NOSAME)
  {
    if (!(b->flags & HA_NOSAME))
      return -1;
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    if ((a->flags ^ b->flags) & (HA_NULL_PART_KEY | HA_END_SPACE_KEY))
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    {
      /* Sort NOT NULL keys before other keys */
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      return (a->flags & (HA_NULL_PART_KEY | HA_END_SPACE_KEY)) ? 1 : -1;
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    }
    if (a->name == primary_key_name)
      return -1;
    if (b->name == primary_key_name)
      return 1;
  }
  else if (b->flags & HA_NOSAME)
    return 1;					// Prefer b

  if ((a->flags ^ b->flags) & HA_FULLTEXT)
  {
    return (a->flags & HA_FULLTEXT) ? 1 : -1;
  }
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  /*
    Prefer original key order.  usable_key_parts contains here
    the original key position.
  */
  return ((a->usable_key_parts < b->usable_key_parts) ? -1 :
	  (a->usable_key_parts > b->usable_key_parts) ? 1 :
	  0);
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}


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/*
  Create a table

  SYNOPSIS
    mysql_create_table()
    thd			Thread object
    db			Database
    table_name		Table name
    create_info		Create information (like MAX_ROWS)
    fields		List of fields to create
    keys		List of keys to create
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    tmp_table		Set to 1 if this is an internal temporary table
			(From ALTER TABLE)    
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  DESCRIPTION		       
    If one creates a temporary table, this is automaticly opened

    no_log is needed for the case of CREATE ... SELECT,
    as the logging will be done later in sql_insert.cc
    select_field_count is also used for CREATE ... SELECT,
    and must be zero for standard create of table.

  RETURN VALUES
    0	ok
    -1	error
*/
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int mysql_create_table(THD *thd,const char *db, const char *table_name,
		       HA_CREATE_INFO *create_info,
		       List<create_field> &fields,
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		       List<Key> &keys,bool tmp_table)
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{
  char		path[FN_REFLEN];
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  const char	*key_name, *alias;
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  create_field	*sql_field,*dup_field;
  int		error= -1;
  uint		db_options,field,null_fields,blob_columns;
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  ulong		record_offset;
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  KEY	*key_info,*key_info_buffer;
  KEY_PART_INFO *key_part_info;
  int		auto_increment=0;
  handler	*file;
  DBUG_ENTER("mysql_create_table");

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  /* Check for duplicate fields and check type of table to create */
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  if (!fields.elements)
  {
    my_error(ER_TABLE_MUST_HAVE_COLUMNS,MYF(0));
    DBUG_RETURN(-1);
  }
  List_iterator<create_field> it(fields),it2(fields);
  null_fields=blob_columns=0;
  db_options=create_info->table_options;
  if (create_info->row_type == ROW_TYPE_DYNAMIC)
    db_options|=HA_OPTION_PACK_RECORD;
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  alias= table_case_name(create_info, table_name);
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  file=get_new_handler((TABLE*) 0, create_info->db_type);

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  if ((create_info->options & HA_LEX_CREATE_TMP_TABLE) &&
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      (file->table_flags() & HA_NO_TEMP_TABLES))
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  {
    my_error(ER_ILLEGAL_HA,MYF(0),table_name);
    DBUG_RETURN(-1);
  }

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  /* Don't pack keys in old tables if the user has requested this */

  while ((sql_field=it++))
  {
    if ((sql_field->flags & BLOB_FLAG) ||
	sql_field->sql_type == FIELD_TYPE_VAR_STRING &&
	create_info->row_type != ROW_TYPE_FIXED)
    {
      db_options|=HA_OPTION_PACK_RECORD;
    }
    if (!(sql_field->flags & NOT_NULL_FLAG))
      null_fields++;
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    if (check_column_name(sql_field->field_name))
    {
      my_error(ER_WRONG_COLUMN_NAME, MYF(0), sql_field->field_name);
      DBUG_RETURN(-1);
    }
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    while ((dup_field=it2++) != sql_field)
    {
      if (my_strcasecmp(sql_field->field_name, dup_field->field_name) == 0)
      {
	my_error(ER_DUP_FIELDNAME,MYF(0),sql_field->field_name);
	DBUG_RETURN(-1);
      }
    }
    it2.rewind();
  }
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  /* record_offset will be increased with 'length-of-null-bits' later */
  record_offset= 0;
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  it.rewind();
  while ((sql_field=it++))
  {
    switch (sql_field->sql_type) {
    case FIELD_TYPE_BLOB:
    case FIELD_TYPE_MEDIUM_BLOB:
    case FIELD_TYPE_TINY_BLOB:
    case FIELD_TYPE_LONG_BLOB:
      sql_field->pack_flag=FIELDFLAG_BLOB |
	pack_length_to_packflag(sql_field->pack_length -
				portable_sizeof_char_ptr);
      if (sql_field->flags & BINARY_FLAG)
	sql_field->pack_flag|=FIELDFLAG_BINARY;
      sql_field->length=8;			// Unireg field length
      sql_field->unireg_check=Field::BLOB_FIELD;
      blob_columns++;
      break;
    case FIELD_TYPE_VAR_STRING:
    case FIELD_TYPE_STRING:
      sql_field->pack_flag=0;
      if (sql_field->flags & BINARY_FLAG)
	sql_field->pack_flag|=FIELDFLAG_BINARY;
      break;
    case FIELD_TYPE_ENUM:
      sql_field->pack_flag=pack_length_to_packflag(sql_field->pack_length) |
	FIELDFLAG_INTERVAL;
      sql_field->unireg_check=Field::INTERVAL_FIELD;
      break;
    case FIELD_TYPE_SET:
      sql_field->pack_flag=pack_length_to_packflag(sql_field->pack_length) |
	FIELDFLAG_BITFIELD;
      sql_field->unireg_check=Field::BIT_FIELD;
      break;
    case FIELD_TYPE_DATE:			// Rest of string types
    case FIELD_TYPE_NEWDATE:
    case FIELD_TYPE_TIME:
    case FIELD_TYPE_DATETIME:
    case FIELD_TYPE_NULL:
      sql_field->pack_flag=f_settype((uint) sql_field->sql_type);
      break;
    case FIELD_TYPE_TIMESTAMP:
      sql_field->unireg_check=Field::TIMESTAMP_FIELD;
      /* fall through */
    default:
      sql_field->pack_flag=(FIELDFLAG_NUMBER |
			    (sql_field->flags & UNSIGNED_FLAG ? 0 :
			     FIELDFLAG_DECIMAL) |
			    (sql_field->flags & ZEROFILL_FLAG ?
			     FIELDFLAG_ZEROFILL : 0) |
			    f_settype((uint) sql_field->sql_type) |
			    (sql_field->decimals << FIELDFLAG_DEC_SHIFT));
      break;
    }
    if (!(sql_field->flags & NOT_NULL_FLAG))
      sql_field->pack_flag|=FIELDFLAG_MAYBE_NULL;
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    sql_field->offset= record_offset;
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    if (MTYP_TYPENR(sql_field->unireg_check) == Field::NEXT_NUMBER)
      auto_increment++;
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    record_offset+= sql_field->pack_length;
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  }
  if (auto_increment > 1)
  {
    my_error(ER_WRONG_AUTO_KEY,MYF(0));
    DBUG_RETURN(-1);
  }
  if (auto_increment &&
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      (file->table_flags() & HA_NO_AUTO_INCREMENT))
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  {
    my_error(ER_TABLE_CANT_HANDLE_AUTO_INCREMENT,MYF(0));
    DBUG_RETURN(-1);
  }

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  if (blob_columns && (file->table_flags() & HA_NO_BLOBS))
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  {
    my_error(ER_TABLE_CANT_HANDLE_BLOB,MYF(0));
    DBUG_RETURN(-1);
  }

  /* Create keys */
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  List_iterator<Key> key_iterator(keys);
  uint key_parts=0,key_count=keys.elements;
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  List<Key> keys_in_order;			// Add new keys here
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  bool primary_key=0,unique_key=0;
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  Key *key;
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  uint tmp, key_number;
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  tmp=min(file->max_keys(), MAX_KEY);
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  if (key_count > tmp)
  {
    my_error(ER_TOO_MANY_KEYS,MYF(0),tmp);
    DBUG_RETURN(-1);
  }
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  /* Calculate number of key segements */
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  while ((key=key_iterator++))
  {
    tmp=max(file->max_key_parts(),MAX_REF_PARTS);
    if (key->columns.elements > tmp)
    {
      my_error(ER_TOO_MANY_KEY_PARTS,MYF(0),tmp);
      DBUG_RETURN(-1);
    }
    if (key->name() && strlen(key->name()) > NAME_LEN)
    {
      my_error(ER_TOO_LONG_IDENT, MYF(0), key->name());
      DBUG_RETURN(-1);
    }
    key_parts+=key->columns.elements;
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  }

  key_info_buffer=key_info=(KEY*) sql_calloc(sizeof(KEY)*key_count);
  key_part_info=(KEY_PART_INFO*) sql_calloc(sizeof(KEY_PART_INFO)*key_parts);
  if (!key_info_buffer || ! key_part_info)
    DBUG_RETURN(-1);				// Out of memory

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  key_iterator.rewind();
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  key_number=0;
  for (; (key=key_iterator++) ; key_info++, key_number++)
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  {
    uint key_length=0;
    key_part_spec *column;

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    key_info->flags= (key->type == Key::MULTIPLE) ? 0 :
                     (key->type == Key::FULLTEXT) ? HA_FULLTEXT : HA_NOSAME;
    key_info->key_parts=(uint8) key->columns.elements;
    key_info->key_part=key_part_info;
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    key_info->usable_key_parts= key_number;
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    key_info->algorithm=key->algorithm;
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    /* TODO: Add proper checks if handler supports key_type and algorithm */
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    if (key->type == Key::FULLTEXT)
    {
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      if (!(file->table_flags() & HA_CAN_FULLTEXT))
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      {
        my_error(ER_TABLE_CANT_HANDLE_FULLTEXT, MYF(0));
        DBUG_RETURN(-1);
      }
    }

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    List_iterator<key_part_spec> cols(key->columns);
    for (uint column_nr=0 ; (column=cols++) ; column_nr++)
    {
      it.rewind();
      field=0;
      while ((sql_field=it++) &&
	     my_strcasecmp(column->field_name,sql_field->field_name))
	field++;
      if (!sql_field)
      {
	my_printf_error(ER_KEY_COLUMN_DOES_NOT_EXITS,
			ER(ER_KEY_COLUMN_DOES_NOT_EXITS),MYF(0),
			column->field_name);
	DBUG_RETURN(-1);
      }
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      /*
        for fulltext keys keyseg length is 1 for blobs (it's ignored in
        ft code anyway, and 0 (set to column width later) for char's.
        it has to be correct col width for char's, as char data are not
        prefixed with length (unlike blobs, where ft code takes data length
        from a data prefix, ignoring column->length).
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      */
      if (key->type == Key::FULLTEXT)
        column->length=test(f_is_blob(sql_field->pack_flag));
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      if (f_is_blob(sql_field->pack_flag))
      {
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	if (!(file->table_flags() & HA_BLOB_KEY))
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	{
	  my_printf_error(ER_BLOB_USED_AS_KEY,ER(ER_BLOB_USED_AS_KEY),MYF(0),
			  column->field_name);
	  DBUG_RETURN(-1);
	}
	if (!column->length)
	{
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          my_printf_error(ER_BLOB_KEY_WITHOUT_LENGTH,
                          ER(ER_BLOB_KEY_WITHOUT_LENGTH),MYF(0),
                          column->field_name);
          DBUG_RETURN(-1);
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	}
      }
      if (!(sql_field->flags & NOT_NULL_FLAG))
      {
	if (key->type == Key::PRIMARY)
	{
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	  /* Implicitly set primary key fields to NOT NULL for ISO conf. */
	  sql_field->flags|= NOT_NULL_FLAG;
	  sql_field->pack_flag&= ~FIELDFLAG_MAYBE_NULL;
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          null_fields--;
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	}
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        else
          key_info->flags|= HA_NULL_PART_KEY;
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	if (!(file->table_flags() & HA_NULL_KEY))
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	{
	  my_printf_error(ER_NULL_COLUMN_IN_INDEX,ER(ER_NULL_COLUMN_IN_INDEX),
			  MYF(0),column->field_name);
	  DBUG_RETURN(-1);
	}
      }
      if (MTYP_TYPENR(sql_field->unireg_check) == Field::NEXT_NUMBER)
      {
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	if (column_nr == 0 || (file->table_flags() & HA_AUTO_PART_KEY))
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	  auto_increment--;			// Field is used
      }
      key_part_info->fieldnr= field;
      key_part_info->offset=  (uint16) sql_field->offset;
      key_part_info->key_type=sql_field->pack_flag;
      uint length=sql_field->pack_length;
      if (column->length)
      {
	if (f_is_blob(sql_field->pack_flag))
	{
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	  if ((length=column->length) > file->max_key_length() ||
	      length > file->max_key_part_length())
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	  {
	    my_error(ER_WRONG_SUB_KEY,MYF(0));
	    DBUG_RETURN(-1);
	  }
	}
	else if (column->length > length ||
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		 ((f_is_packed(sql_field->pack_flag) || 
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		   ((file->table_flags() & HA_NO_PREFIX_CHAR_KEYS) &&
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		    (key_info->flags & HA_NOSAME))) &&
		  column->length != length))
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	{
	  my_error(ER_WRONG_SUB_KEY,MYF(0));
	  DBUG_RETURN(-1);
	}
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	if (!(file->table_flags() & HA_NO_PREFIX_CHAR_KEYS))
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	  length=column->length;
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      }
      else if (length == 0)
      {
	my_printf_error(ER_WRONG_KEY_COLUMN, ER(ER_WRONG_KEY_COLUMN), MYF(0),
			column->field_name);
	  DBUG_RETURN(-1);
      }
      key_part_info->length=(uint8) length;
      /* Use packed keys for long strings on the first column */
      if (!(db_options & HA_OPTION_NO_PACK_KEYS) &&
	  (length >= KEY_DEFAULT_PACK_LENGTH &&
	   (sql_field->sql_type == FIELD_TYPE_STRING ||
	    sql_field->sql_type == FIELD_TYPE_VAR_STRING ||
	    sql_field->pack_flag & FIELDFLAG_BLOB)))
      {
	if (column_nr == 0 && (sql_field->pack_flag & FIELDFLAG_BLOB))
	  key_info->flags|= HA_BINARY_PACK_KEY;
	else
	  key_info->flags|= HA_PACK_KEY;
      }
      key_length+=length;
      key_part_info++;

      /* Create the key name based on the first column (if not given) */
      if (column_nr == 0)
      {
	if (key->type == Key::PRIMARY)
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	{
	  if (primary_key)
	  {
	    my_error(ER_MULTIPLE_PRI_KEY,MYF(0));
	    DBUG_RETURN(-1);
	  }
	  key_name=primary_key_name;
	  primary_key=1;
	}
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	else if (!(key_name = key->name()))
	  key_name=make_unique_key_name(sql_field->field_name,
					key_info_buffer,key_info);
	if (check_if_keyname_exists(key_name,key_info_buffer,key_info))
	{
	  my_error(ER_DUP_KEYNAME,MYF(0),key_name);
	  DBUG_RETURN(-1);
	}
	key_info->name=(char*) key_name;
      }
    }
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    if (!(key_info->flags & HA_NULL_PART_KEY))
      unique_key=1;
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    key_info->key_length=(uint16) key_length;
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    uint max_key_length= min(file->max_key_length(), MAX_KEY_LENGTH);
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    if (key_length > max_key_length && key->type != Key::FULLTEXT)
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    {
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      my_error(ER_TOO_LONG_KEY,MYF(0),max_key_length);
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      DBUG_RETURN(-1);
    }
  }
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  if (!unique_key && !primary_key &&
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      (file->table_flags() & HA_REQUIRE_PRIMARY_KEY))
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  {
    my_error(ER_REQUIRES_PRIMARY_KEY,MYF(0));
    DBUG_RETURN(-1);
  }
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  if (auto_increment > 0)
  {
    my_error(ER_WRONG_AUTO_KEY,MYF(0));
    DBUG_RETURN(-1);
  }
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  /* Sort keys in optimized order */
  qsort((gptr) key_info_buffer, key_count, sizeof(KEY), (qsort_cmp) sort_keys);
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      /* Check if table exists */
  if (create_info->options & HA_LEX_CREATE_TMP_TABLE)
  {
    sprintf(path,"%s%s%lx_%lx_%x%s",mysql_tmpdir,tmp_file_prefix,
	    current_pid, thd->thread_id, thd->tmp_table++,reg_ext);
    create_info->table_options|=HA_CREATE_DELAY_KEY_WRITE;
  }
  else
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    (void) sprintf(path,"%s/%s/%s%s",mysql_data_home,db,alias,reg_ext);
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  unpack_filename(path,path);
  /* Check if table already exists */
  if ((create_info->options & HA_LEX_CREATE_TMP_TABLE)
      && find_temporary_table(thd,db,table_name))
  {
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    if (create_info->options & HA_LEX_CREATE_IF_NOT_EXISTS)
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    {
      create_info->table_existed= 1;		// Mark that table existed
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      DBUG_RETURN(0);
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    }
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    my_error(ER_TABLE_EXISTS_ERROR,MYF(0),table_name);
    DBUG_RETURN(-1);
  }
  VOID(pthread_mutex_lock(&LOCK_open));
  if (!tmp_table && !(create_info->options & HA_LEX_CREATE_TMP_TABLE))
  {
    if (!access(path,F_OK))
    {
      VOID(pthread_mutex_unlock(&LOCK_open));
      if (create_info->options & HA_LEX_CREATE_IF_NOT_EXISTS)
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      {
	create_info->table_existed= 1;		// Mark that table existed
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	DBUG_RETURN(0);
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      }
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      my_error(ER_TABLE_EXISTS_ERROR,MYF(0), alias);
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      DBUG_RETURN(-1);
    }
  }

  thd->proc_info="creating table";
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  create_info->table_existed= 0;		// Mark that table is created
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  if (thd->sql_mode & MODE_NO_DIR_IN_CREATE)
    create_info->data_file_name= create_info->index_file_name= 0;
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  create_info->table_options=db_options;
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  create_info->null_bits= null_fields;
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  if (rea_create_table(path, create_info, fields, key_count,
		       key_info_buffer))
  {
    /* my_error(ER_CANT_CREATE_TABLE,MYF(0),table_name,my_errno); */
    goto end;
  }
  if (create_info->options & HA_LEX_CREATE_TMP_TABLE)
  {
    /* Open table and put in temporary table list */
    if (!(open_temporary_table(thd, path, db, table_name, 1)))
    {
      (void) rm_temporary_table(create_info->db_type, path);
      goto end;
    }
  }
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  if (!tmp_table)
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  {
    // Must be written before unlock
    mysql_update_log.write(thd,thd->query, thd->query_length);
    if (mysql_bin_log.is_open())
    {
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      thd->clear_error();
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      Query_log_event qinfo(thd, thd->query, thd->query_length,
			    test(create_info->options &
				 HA_LEX_CREATE_TMP_TABLE));
      mysql_bin_log.write(&qinfo);
    }
  }
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  error=0;
end:
  VOID(pthread_mutex_unlock(&LOCK_open));
  thd->proc_info="After create";
  DBUG_RETURN(error);
}

/*
** Give the key name after the first field with an optional '_#' after
**/

static bool
check_if_keyname_exists(const char *name, KEY *start, KEY *end)
{
  for (KEY *key=start ; key != end ; key++)
    if (!my_strcasecmp(name,key->name))
      return 1;
  return 0;
}


static char *
make_unique_key_name(const char *field_name,KEY *start,KEY *end)
{
  char buff[MAX_FIELD_NAME],*buff_end;

  if (!check_if_keyname_exists(field_name,start,end))
    return (char*) field_name;			// Use fieldname
  buff_end=strmake(buff,field_name,MAX_FIELD_NAME-4);
  for (uint i=2 ; ; i++)
  {
    sprintf(buff_end,"_%d",i);
    if (!check_if_keyname_exists(buff,start,end))
      return sql_strdup(buff);
  }
}

/****************************************************************************
** Create table from a list of fields and items
****************************************************************************/

TABLE *create_table_from_items(THD *thd, HA_CREATE_INFO *create_info,
			       const char *db, const char *name,
			       List<create_field> *extra_fields,
			       List<Key> *keys,
			       List<Item> *items,
			       MYSQL_LOCK **lock)
{
  TABLE tmp_table;		// Used during 'create_field()'
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  TABLE *table= 0;
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  tmp_table.table_name=0;
  DBUG_ENTER("create_table_from_items");

  /* Add selected items to field list */
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  List_iterator_fast<Item> it(*items);
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  Item *item;
  Field *tmp_field;
  tmp_table.db_create_options=0;
  tmp_table.null_row=tmp_table.maybe_null=0;
  tmp_table.blob_ptr_size=portable_sizeof_char_ptr;
  tmp_table.db_low_byte_first= test(create_info->db_type == DB_TYPE_MYISAM ||
				    create_info->db_type == DB_TYPE_HEAP);

  while ((item=it++))
  {
    create_field *cr_field;
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    Field *field;
    if (item->type() == Item::FUNC_ITEM)
      field=item->tmp_table_field(&tmp_table);
    else
      field=create_tmp_field(thd, &tmp_table, item, item->type(),
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				  (Item ***) 0, &tmp_field,0,0);
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    if (!field ||
	!(cr_field=new create_field(field,(item->type() == Item::FIELD_ITEM ?
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					   ((Item_field *)item)->field :
					   (Field*) 0))))
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      DBUG_RETURN(0);
    extra_fields->push_back(cr_field);
  }
  /* create and lock table */
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  /* QQ: create and open should be done atomic ! */
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  /*
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    We don't log the statement, it will be logged later.
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    If this is a HEAP table, the automatic DELETE FROM which is written to the
    binlog when a HEAP table is opened for the first time since startup, must
    not be written: 1) it would be wrong (imagine we're in CREATE SELECT: we
    don't want to delete from it) 2) it would be written before the CREATE
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    TABLE, which is a wrong order. So we keep binary logging disabled when we
    open_table().
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  */
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  tmp_disable_binlog(thd);
  if (!mysql_create_table(thd,db,name,create_info,*extra_fields,*keys,0))
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  {
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    if (!(table=open_table(thd,db,name,name,(bool*) 0)))
      quick_rm_table(create_info->db_type,db,table_case_name(create_info,name));
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  }
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  reenable_binlog(thd);
  if (!table)
    DBUG_RETURN(0);
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  table->reginfo.lock_type=TL_WRITE;
  if (!((*lock)=mysql_lock_tables(thd,&table,1)))
  {
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    VOID(pthread_mutex_lock(&LOCK_open));
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    hash_delete(&open_cache,(byte*) table);
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    VOID(pthread_mutex_unlock(&LOCK_open));
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    quick_rm_table(create_info->db_type,db,table_case_name(create_info, name));
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    DBUG_RETURN(0);
  }
  table->file->extra(HA_EXTRA_WRITE_CACHE);
  DBUG_RETURN(table);
}


/****************************************************************************
** Alter a table definition
****************************************************************************/

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bool
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mysql_rename_table(enum db_type base,
		   const char *old_db,
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		   const char *old_name,
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		   const char *new_db,
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		   const char *new_name)
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{
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  char from[FN_REFLEN], to[FN_REFLEN];
  char tmp_from[NAME_LEN+1], tmp_to[NAME_LEN+1];
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  handler *file=get_new_handler((TABLE*) 0, base);
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  int error=0;
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  DBUG_ENTER("mysql_rename_table");
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  if (lower_case_table_names == 2 && !(file->table_flags() & HA_FILE_BASED))
  {
    /* Table handler expects to get all file names as lower case */
    strmov(tmp_from, old_name);
    casedn_str(tmp_from);
    old_name= tmp_from;

    strmov(tmp_to, new_name);
    casedn_str(tmp_to);
    new_name= tmp_to;
  }
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  (void) sprintf(from,"%s/%s/%s",mysql_data_home,old_db,old_name);
  (void) sprintf(to,"%s/%s/%s",mysql_data_home,new_db,new_name);
  fn_format(from,from,"","",4);
  fn_format(to,to,    "","",4);
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  if (!(error=file->rename_table((const char*) from,(const char *) to)))
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  {
    if (rename_file_ext(from,to,reg_ext))
    {
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      error=my_errno;
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      /* Restore old file name */
      file->rename_table((const char*) to,(const char *) from);
    }
  }
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  delete file;
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  if (error)
    my_error(ER_ERROR_ON_RENAME, MYF(0), from, to, error);
  DBUG_RETURN(error != 0);
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}

960

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/*
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  Force all other threads to stop using the table

  SYNOPSIS
    wait_while_table_is_used()
    thd			Thread handler
    table		Table to remove from cache
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    function		HA_EXTRA_PREPARE_FOR_DELETE if table is to be deleted
			HA_EXTRA_FORCE_REOPEN if table is not be used    
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  NOTES
   When returning, the table will be unusable for other threads until
   the table is closed.

  PREREQUISITES
    Lock on LOCK_open
    Win32 clients must also have a WRITE LOCK on the table !
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*/

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static void wait_while_table_is_used(THD *thd,TABLE *table,
				     enum ha_extra_function function)
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{
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  DBUG_PRINT("enter",("table: %s", table->real_name));
  DBUG_ENTER("wait_while_table_is_used");
  safe_mutex_assert_owner(&LOCK_open);

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  VOID(table->file->extra(function));
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  /* Mark all tables that are in use as 'old' */
  mysql_lock_abort(thd, table);			// end threads waiting on lock

  /* Wait until all there are no other threads that has this table open */
  while (remove_table_from_cache(thd,table->table_cache_key,
				 table->real_name))
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  {
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    dropping_tables++;
    (void) pthread_cond_wait(&COND_refresh,&LOCK_open);
    dropping_tables--;
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  }
  DBUG_VOID_RETURN;
}

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/*
  Close a cached table

  SYNOPSIS
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    close_cached_table()
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    thd			Thread handler
    table		Table to remove from cache

  NOTES
    Function ends by signaling threads waiting for the table to try to
    reopen the table.
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  PREREQUISITES
    Lock on LOCK_open
    Win32 clients must also have a WRITE LOCK on the table !
*/
  
static bool close_cached_table(THD *thd, TABLE *table)
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{
  DBUG_ENTER("close_cached_table");
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  wait_while_table_is_used(thd, table, HA_EXTRA_PREPARE_FOR_DELETE);
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  /* Close lock if this is not got with LOCK TABLES */
  if (thd->lock)
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  {
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    mysql_unlock_tables(thd, thd->lock);
    thd->lock=0;			// Start locked threads
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  }
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  /* Close all copies of 'table'.  This also frees all LOCK TABLES lock */
  thd->open_tables=unlink_open_table(thd,thd->open_tables,table);

  /* When lock on LOCK_open is freed other threads can continue */
  pthread_cond_broadcast(&COND_refresh);
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  DBUG_RETURN(0);
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}

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static int send_check_errmsg(THD* thd, TABLE_LIST* table,
			     const char* operator_name, const char* errmsg)
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{
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  String* packet = &thd->packet;
  packet->length(0);
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  net_store_data(packet, table->alias);
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  net_store_data(packet, (char*)operator_name);
  net_store_data(packet, "error");
  net_store_data(packet, errmsg);
  thd->net.last_error[0]=0;
  if (my_net_write(&thd->net, (char*) thd->packet.ptr(),
		   packet->length()))
    return -1;
  return 1;
}

1055

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1056
static int prepare_for_restore(THD* thd, TABLE_LIST* table,
1057
			       HA_CHECK_OPT *check_opt)
1058
{
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1059
  DBUG_ENTER("prepare_for_restore");
1060

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1061 1062 1063 1064 1065 1066
  if (table->table) // do not overwrite existing tables on restore
  {
    DBUG_RETURN(send_check_errmsg(thd, table, "restore",
				  "table exists, will not overwrite on restore"
				  ));
  }
1067
  else
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  {
    char* backup_dir = thd->lex.backup_dir;
    char src_path[FN_REFLEN], dst_path[FN_REFLEN];
1071
    char* table_name = table->real_name;
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1072
    char* db = thd->db ? thd->db : table->db;
1073

1074 1075
    if (fn_format_relative_to_data_home(src_path, table_name, backup_dir,
					reg_ext))
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1076
      DBUG_RETURN(-1); // protect buffer overflow
1077

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1078
    sprintf(dst_path, "%s/%s/%s", mysql_real_data_home, db, table_name);
1079

1080
    if (lock_and_wait_for_table_name(thd,table))
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1081
      DBUG_RETURN(-1);
1082

1083
    if (my_copy(src_path,
1084 1085
		fn_format(dst_path, dst_path,"", reg_ext, 4),
		MYF(MY_WME)))
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1086
    {
1087
      pthread_mutex_lock(&LOCK_open);
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1088
      unlock_table_name(thd, table);
1089
      pthread_mutex_unlock(&LOCK_open);
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1090 1091 1092
      DBUG_RETURN(send_check_errmsg(thd, table, "restore",
				    "Failed copying .frm file"));
    }
1093
    if (mysql_truncate(thd, table, 1))
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1094
    {
1095
      pthread_mutex_lock(&LOCK_open);
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1096
      unlock_table_name(thd, table);
1097
      pthread_mutex_unlock(&LOCK_open);
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1098 1099
      DBUG_RETURN(send_check_errmsg(thd, table, "restore",
				    "Failed generating table from .frm file"));
1100
    }
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1101
  }
1102

1103 1104 1105 1106
  /*
    Now we should be able to open the partially restored table
    to finish the restore in the handler later on
  */
1107
  if (!(table->table = reopen_name_locked_table(thd, table)))
1108 1109
  {
    pthread_mutex_lock(&LOCK_open);
1110
    unlock_table_name(thd, table);
1111 1112
    pthread_mutex_unlock(&LOCK_open);
  }
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1113
  DBUG_RETURN(0);
1114
}
1115

1116

1117
static int prepare_for_repair(THD* thd, TABLE_LIST *table_list,
1118
			      HA_CHECK_OPT *check_opt)
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1119
{
1120 1121
  int error= 0;
  TABLE tmp_table, *table;
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1122 1123
  DBUG_ENTER("prepare_for_repair");

1124 1125 1126 1127
  if (!(check_opt->sql_flags & TT_USEFRM))
    DBUG_RETURN(0);

  if (!(table= table_list->table))		/* if open_ltable failed */
1128
  {
1129 1130 1131 1132 1133 1134
    char name[FN_REFLEN];
    strxmov(name, mysql_data_home, "/", table_list->db, "/",
	    table_list->real_name, NullS);
    if (openfrm(name, "", 0, 0, 0, &tmp_table))
      DBUG_RETURN(0);				// Can't open frm file
    table= &tmp_table;
1135 1136
  }

1137 1138 1139 1140 1141 1142 1143 1144 1145 1146 1147 1148 1149 1150 1151 1152 1153 1154 1155 1156 1157 1158 1159 1160 1161 1162 1163
  /*
    User gave us USE_FRM which means that the header in the index file is
    trashed.
    In this case we will try to fix the table the following way:
    - Rename the data file to a temporary name
    - Truncate the table
    - Replace the new data file with the old one
    - Run a normal repair using the new index file and the old data file
  */

  char from[FN_REFLEN],tmp[FN_REFLEN+32];
  const char **ext= table->file->bas_ext();
  MY_STAT stat_info;

  /*
    Check if this is a table type that stores index and data separately,
    like ISAM or MyISAM
  */
  if (!ext[0] || !ext[1])
    goto end;					// No data file

  strxmov(from, table->path, ext[1], NullS);	// Name of data file
  if (!my_stat(from, &stat_info, MYF(0)))
    goto end;				// Can't use USE_FRM flag

  sprintf(tmp,"%s-%lx_%lx", from, current_pid, thd->thread_id);

1164 1165 1166 1167 1168 1169 1170
  /* If we could open the table, close it */
  if (table_list->table)
  {
    pthread_mutex_lock(&LOCK_open);
    close_cached_table(thd, table);
    pthread_mutex_unlock(&LOCK_open);
  }
1171
  if (lock_and_wait_for_table_name(thd,table_list))
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  {
1173 1174
    error= -1;
    goto end;
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  }
1176
  if (my_rename(from, tmp, MYF(MY_WME)))
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  {
1178
    pthread_mutex_lock(&LOCK_open);
1179
    unlock_table_name(thd, table_list);
1180
    pthread_mutex_unlock(&LOCK_open);
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    error= send_check_errmsg(thd, table_list, "repair",
			     "Failed renaming data file");
    goto end;
  }
  if (mysql_truncate(thd, table_list, 1))
  {
    pthread_mutex_lock(&LOCK_open);
    unlock_table_name(thd, table_list);
    pthread_mutex_unlock(&LOCK_open);
    error= send_check_errmsg(thd, table_list, "repair",
			     "Failed generating table from .frm file");
    goto end;
  }
  if (my_rename(tmp, from, MYF(MY_WME)))
  {
    pthread_mutex_lock(&LOCK_open);
    unlock_table_name(thd, table_list);
    pthread_mutex_unlock(&LOCK_open);
    error= send_check_errmsg(thd, table_list, "repair",
			     "Failed restoring .MYD file");
    goto end;
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  }

1204 1205 1206 1207
  /*
    Now we should be able to open the partially repaired table
    to finish the repair in the handler later on.
  */
1208
  if (!(table_list->table = reopen_name_locked_table(thd, table_list)))
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  {
    pthread_mutex_lock(&LOCK_open);
1211
    unlock_table_name(thd, table_list);
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    pthread_mutex_unlock(&LOCK_open);
  }
1214 1215 1216 1217 1218

end:
  if (table == &tmp_table)
    closefrm(table);				// Free allocated memory
  DBUG_RETURN(error);
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}
1220

1221

1222 1223
static int mysql_admin_table(THD* thd, TABLE_LIST* tables,
			     HA_CHECK_OPT* check_opt,
1224
			     const char *operator_name,
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1225
			     thr_lock_type lock_type,
1226
			     bool open_for_modify,
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			     uint extra_open_options,
1228 1229
			     int (*prepare_func)(THD *, TABLE_LIST *,
						 HA_CHECK_OPT *),
1230 1231
			     int (handler::*operator_func)
			     (THD *, HA_CHECK_OPT *))
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{
  TABLE_LIST *table;
  List<Item> field_list;
  Item* item;
  String* packet = &thd->packet;
1237
  DBUG_ENTER("mysql_admin_table");
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  field_list.push_back(item = new Item_empty_string("Table", NAME_LEN*2));
  item->maybe_null = 1;
  field_list.push_back(item = new Item_empty_string("Op", 10));
  item->maybe_null = 1;
  field_list.push_back(item = new Item_empty_string("Msg_type", 10));
  item->maybe_null = 1;
  field_list.push_back(item = new Item_empty_string("Msg_text", 255));
  item->maybe_null = 1;
  if (send_fields(thd, field_list, 1))
    DBUG_RETURN(-1);

1250
  mysql_ha_flush(thd, tables, MYSQL_HA_CLOSE_FINAL);
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  for (table = tables; table; table = table->next)
  {
    char table_name[NAME_LEN*2+2];
    char* db = (table->db) ? table->db : thd->db;
1255
    bool fatal_error=0;
1256
    strxmov(table_name,db ? db : "",".",table->real_name,NullS);
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1257

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1258
    thd->open_options|= extra_open_options;
1259
    table->table = open_ltable(thd, table, lock_type);
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1260
    thd->open_options&= ~extra_open_options;
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1261
    packet->length(0);
1262
    if (prepare_func)
1263
    {
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      switch ((*prepare_func)(thd, table, check_opt)) {
1265 1266 1267 1268 1269 1270 1271
      case  1:           // error, message written to net
        close_thread_tables(thd);
        continue;
      case -1:           // error, message could be written to net
        goto err;
      default:           // should be 0 otherwise
        ;
1272
      }
1273
    }
1274

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    if (!table->table)
    {
      const char *err_msg;
      net_store_data(packet, table_name);
1279
      net_store_data(packet, operator_name);
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      net_store_data(packet, "error");
      if (!(err_msg=thd->net.last_error))
	err_msg=ER(ER_CHECK_NO_SUCH_TABLE);
      net_store_data(packet, err_msg);
      thd->net.last_error[0]=0;
      if (my_net_write(&thd->net, (char*) thd->packet.ptr(),
		       packet->length()))
	goto err;
      continue;
    }
1290
    if ((table->table->db_stat & HA_READ_ONLY) && open_for_modify)
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    {
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      char buff[FN_REFLEN + MYSQL_ERRMSG_SIZE];
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      net_store_data(packet, table_name);
1294
      net_store_data(packet, operator_name);
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1295
      net_store_data(packet, "error");
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      sprintf(buff, ER(ER_OPEN_AS_READONLY), table_name);
      net_store_data(packet, buff);
1298
      close_thread_tables(thd);
1299
      table->table=0;				// For query cache
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      if (my_net_write(&thd->net, (char*) thd->packet.ptr(),
		       packet->length()))
	goto err;
      continue;
    }

1306
    /* Close all instances of the table to allow repair to rename files */
1307
    if (lock_type == TL_WRITE && table->table->version)
1308 1309
    {
      pthread_mutex_lock(&LOCK_open);
1310 1311
      const char *old_message=thd->enter_cond(&COND_refresh, &LOCK_open,
					      "Waiting to get writelock");
1312 1313 1314 1315 1316 1317 1318 1319 1320
      mysql_lock_abort(thd,table->table);
      while (remove_table_from_cache(thd, table->table->table_cache_key,
				     table->table->real_name) &&
	     ! thd->killed)
      {
	dropping_tables++;
	(void) pthread_cond_wait(&COND_refresh,&LOCK_open);
	dropping_tables--;
      }
1321
      thd->exit_cond(old_message);
1322 1323
      if (thd->killed)
	goto err;
1324
      open_for_modify=0;
1325 1326
    }

1327
    int result_code = (table->table->file->*operator_func)(thd, check_opt);
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    packet->length(0);
    net_store_data(packet, table_name);
1330
    net_store_data(packet, operator_name);
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1332 1333
    switch (result_code) {
    case HA_ADMIN_NOT_IMPLEMENTED:
1334 1335 1336 1337 1338 1339 1340
      {
        char buf[ERRMSGSIZE+20];
        my_snprintf(buf, ERRMSGSIZE,
            ER(ER_CHECK_NOT_IMPLEMENTED), operator_name);
        net_store_data(packet, "error");
        net_store_data(packet, buf);
      }
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      break;

1343
    case HA_ADMIN_OK:
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      net_store_data(packet, "status");
      net_store_data(packet, "OK");
      break;

1348
    case HA_ADMIN_FAILED:
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      net_store_data(packet, "status");
1350
      net_store_data(packet, "Operation failed");
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      break;

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    case HA_ADMIN_REJECT:
      net_store_data(packet,"status");
      net_store_data(packet,"Operation need committed state");
      open_for_modify= false;
      break;

1359
    case HA_ADMIN_ALREADY_DONE:
1360
      net_store_data(packet, "status");
1361
      net_store_data(packet, "Table is already up to date");
1362 1363
      break;

1364 1365
    case HA_ADMIN_CORRUPT:
      net_store_data(packet, "error");
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      net_store_data(packet, "Corrupt");
1367
      fatal_error=1;
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      break;

1370 1371 1372 1373 1374
    case HA_ADMIN_INVALID:
      net_store_data(packet, "error");
      net_store_data(packet, "Invalid argument");
      break;

1375 1376 1377
    default:				// Probably HA_ADMIN_INTERNAL_ERROR
      net_store_data(packet, "error");
      net_store_data(packet, "Unknown - internal error during operation");
1378
      fatal_error=1;
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      break;
    }
1381
    if (fatal_error)
1382
      table->table->version=0;			// Force close of table
1383
    else if (open_for_modify)
1384
    {
1385
      pthread_mutex_lock(&LOCK_open);
1386 1387
      remove_table_from_cache(thd, table->table->table_cache_key,
			      table->table->real_name);
1388
      pthread_mutex_unlock(&LOCK_open);
1389 1390 1391
      /* May be something modified consequently we have to invalidate cache */
      query_cache_invalidate3(thd, table->table, 0);
    }
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    close_thread_tables(thd);
1393
    table->table=0;				// For query cache
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    if (my_net_write(&thd->net, (char*) packet->ptr(),
		     packet->length()))
      goto err;
  }

  send_eof(&thd->net);
  DBUG_RETURN(0);
 err:
1402
  close_thread_tables(thd);			// Shouldn't be needed
1403 1404
  if (table)
    table->table=0;
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  DBUG_RETURN(-1);
}

1408

1409 1410 1411 1412
int mysql_backup_table(THD* thd, TABLE_LIST* table_list)
{
  DBUG_ENTER("mysql_backup_table");
  DBUG_RETURN(mysql_admin_table(thd, table_list, 0,
1413
				"backup", TL_READ, 0, 0, 0,
1414 1415
				&handler::backup));
}
1416

1417

1418 1419 1420 1421
int mysql_restore_table(THD* thd, TABLE_LIST* table_list)
{
  DBUG_ENTER("mysql_restore_table");
  DBUG_RETURN(mysql_admin_table(thd, table_list, 0,
1422 1423
				"restore", TL_WRITE, 1, 0,
                                &prepare_for_restore,
1424 1425
				&handler::restore));
}
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1426

1427

1428 1429 1430 1431
int mysql_repair_table(THD* thd, TABLE_LIST* tables, HA_CHECK_OPT* check_opt)
{
  DBUG_ENTER("mysql_repair_table");
  DBUG_RETURN(mysql_admin_table(thd, tables, check_opt,
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				"repair", TL_WRITE, 1, HA_OPEN_FOR_REPAIR,
                                &prepare_for_repair,
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				&handler::repair));
}

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1438 1439 1440 1441
int mysql_optimize_table(THD* thd, TABLE_LIST* tables, HA_CHECK_OPT* check_opt)
{
  DBUG_ENTER("mysql_optimize_table");
  DBUG_RETURN(mysql_admin_table(thd, tables, check_opt,
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				"optimize", TL_WRITE, 1,0,0,
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				&handler::optimize));
}


int mysql_analyze_table(THD* thd, TABLE_LIST* tables, HA_CHECK_OPT* check_opt)
{
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#ifdef OS2
  thr_lock_type lock_type = TL_WRITE;
#else
  thr_lock_type lock_type = TL_READ_NO_INSERT;
#endif

1455 1456
  DBUG_ENTER("mysql_analyze_table");
  DBUG_RETURN(mysql_admin_table(thd, tables, check_opt,
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				"analyze", lock_type, 1,0,0,
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				&handler::analyze));
}


int mysql_check_table(THD* thd, TABLE_LIST* tables,HA_CHECK_OPT* check_opt)
{
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#ifdef OS2
  thr_lock_type lock_type = TL_WRITE;
#else
  thr_lock_type lock_type = TL_READ_NO_INSERT;
#endif

1470 1471
  DBUG_ENTER("mysql_check_table");
  DBUG_RETURN(mysql_admin_table(thd, tables, check_opt,
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				"check", lock_type,
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				0, HA_OPEN_FOR_REPAIR, 0,
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				&handler::check));
}

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int mysql_alter_table(THD *thd,char *new_db, char *new_name,
		      HA_CREATE_INFO *create_info,
		      TABLE_LIST *table_list,
		      List<create_field> &fields,
		      List<Key> &keys,List<Alter_drop> &drop_list,
		      List<Alter_column> &alter_list,
1484
                      ORDER *order,
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		      bool drop_primary,
1486
		      enum enum_duplicates handle_duplicates,
1487
	              enum enum_enable_or_disable keys_onoff,
1488
                      bool simple_alter)
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{
  TABLE *table,*new_table;
  int error;
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  char tmp_name[80],old_name[32],new_name_buff[FN_REFLEN];
  char new_alias_buff[FN_REFLEN], *table_name, *db, *new_alias, *alias;
1494
  char index_file[FN_REFLEN], data_file[FN_REFLEN];
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  bool use_timestamp=0;
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  ha_rows copied,deleted;
  ulonglong next_insert_id;
1498
  uint save_time_stamp,db_create_options, used_fields;
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  enum db_type old_db_type,new_db_type;
  DBUG_ENTER("mysql_alter_table");

  thd->proc_info="init";
  table_name=table_list->real_name;
1504 1505
  alias= (lower_case_table_names == 2) ? table_list->alias : table_name;

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  db=table_list->db;
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  if (!new_db ||
      lower_case_table_names && !my_strcasecmp(new_db, db) ||
      !lower_case_table_names && !strcmp(new_db, db))
  {
    new_db= db;
  }
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  used_fields=create_info->used_fields;
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  mysql_ha_flush(thd, table_list, MYSQL_HA_CLOSE_FINAL);
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  if (!(table=open_ltable(thd,table_list,TL_WRITE_ALLOW_READ)))
    DBUG_RETURN(-1);

  /* Check that we are not trying to rename to an existing table */
  if (new_name)
  {
    strmov(new_name_buff,new_name);
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    strmov(new_alias= new_alias_buff, new_name);
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    if (lower_case_table_names)
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    {
      if (lower_case_table_names != 2)
      {
	casedn_str(new_name_buff);
	new_alias= new_name;			// Create lower case table name
      }
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      casedn_str(new_name);
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    }
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    if (new_db == db &&
        (lower_case_table_names &&
	 !my_strcasecmp(new_name_buff,table_name) ||
	 !lower_case_table_names &&
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	 !strcmp(new_name_buff,table_name)))
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    {
      /*
        Source and destination table names are equal: make later check
        easier.
      */
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      new_alias= new_name= table_name;
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    }
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    else
    {
      if (table->tmp_table)
      {
	if (find_temporary_table(thd,new_db,new_name_buff))
	{
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	  my_error(ER_TABLE_EXISTS_ERROR,MYF(0),new_name_buff);
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	  DBUG_RETURN(-1);
	}
      }
      else
      {
	if (!access(fn_format(new_name_buff,new_name_buff,new_db,reg_ext,0),
		    F_OK))
	{
	  /* Table will be closed in do_command() */
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	  my_error(ER_TABLE_EXISTS_ERROR,MYF(0), new_alias);
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	  DBUG_RETURN(-1);
	}
      }
    }
  }
  else
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  {
    new_alias= (lower_case_table_names == 2) ? alias : table_name;
    new_name= table_name;
  }
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  old_db_type=table->db_type;
  if (create_info->db_type == DB_TYPE_DEFAULT)
    create_info->db_type=old_db_type;
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  new_db_type=create_info->db_type= ha_checktype(create_info->db_type);
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  if (create_info->row_type == ROW_TYPE_NOT_USED)
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    create_info->row_type=table->row_type;

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  /* In some simple cases we need not to recreate the table */
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  thd->proc_info="setup";
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  if (simple_alter && !table->tmp_table)
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  {
    error=0;
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    if (new_name != table_name || new_db != db)
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    {
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      thd->proc_info="rename";
      VOID(pthread_mutex_lock(&LOCK_open));
      /* Then do a 'simple' rename of the table */
      error=0;
      if (!access(new_name_buff,F_OK))
      {
        my_error(ER_TABLE_EXISTS_ERROR,MYF(0),new_name);
        error= -1;
      }
      else
      {
        *fn_ext(new_name)=0;
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        close_cached_table(thd, table);
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        if (mysql_rename_table(old_db_type,db,table_name,new_db,new_alias))
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	  error= -1;
      }
      VOID(pthread_mutex_unlock(&LOCK_open));
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    }
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    if (!error)
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    {
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      switch (keys_onoff) {
      case LEAVE_AS_IS:
	break;
      case ENABLE:
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	VOID(pthread_mutex_lock(&LOCK_open));
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	wait_while_table_is_used(thd, table, HA_EXTRA_FORCE_REOPEN);
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	VOID(pthread_mutex_unlock(&LOCK_open));
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	error= (table->file->activate_all_index(thd) ? -1 : 0);
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	/* COND_refresh will be signaled in close_thread_tables() */
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	break;
      case DISABLE:
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	VOID(pthread_mutex_lock(&LOCK_open));
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	wait_while_table_is_used(thd, table, HA_EXTRA_FORCE_REOPEN);
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	VOID(pthread_mutex_unlock(&LOCK_open));
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	table->file->deactivate_non_unique_index(HA_POS_ERROR);
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	/* COND_refresh will be signaled in close_thread_tables() */
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	break;
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      }
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    }
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    if (!error)
    {
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      mysql_update_log.write(thd, thd->query, thd->query_length);
      if (mysql_bin_log.is_open())
      {
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        thd->clear_error();
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	Query_log_event qinfo(thd, thd->query, thd->query_length, 0);
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	mysql_bin_log.write(&qinfo);
      }
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      send_ok(&thd->net);
    }
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    table_list->table=0;				// For query cache
    query_cache_invalidate3(thd, table_list, 0);
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    DBUG_RETURN(error);
  }

  /* Full alter table */
  restore_record(table,2);			// Empty record for DEFAULT
  List_iterator<Alter_drop> drop_it(drop_list);
  List_iterator<create_field> def_it(fields);
  List_iterator<Alter_column> alter_it(alter_list);
  List<create_field> create_list;		// Add new fields here
  List<Key> key_list;				// Add new keys here

  /*
  ** First collect all fields from table which isn't in drop_list
  */

  create_field *def;
  Field **f_ptr,*field;
  for (f_ptr=table->field ; (field= *f_ptr) ; f_ptr++)
  {
    /* Check if field should be droped */
    Alter_drop *drop;
    drop_it.rewind();
    while ((drop=drop_it++))
    {
      if (drop->type == Alter_drop::COLUMN &&
	  !my_strcasecmp(field->field_name, drop->name))
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      {
	/* Reset auto_increment value if it was dropped */
	if (MTYP_TYPENR(field->unireg_check) == Field::NEXT_NUMBER &&
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	    !(used_fields & HA_CREATE_USED_AUTO))
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	{
	  create_info->auto_increment_value=0;
	  create_info->used_fields|=HA_CREATE_USED_AUTO;
	}
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	break;
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      }
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    }
    if (drop)
    {
      drop_it.remove();
      continue;
    }
    /* Check if field is changed */
    def_it.rewind();
    while ((def=def_it++))
    {
      if (def->change && !my_strcasecmp(field->field_name, def->change))
	break;
    }
    if (def)
    {						// Field is changed
      def->field=field;
      if (def->sql_type == FIELD_TYPE_TIMESTAMP)
	use_timestamp=1;
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      if (!def->after)
      {
	create_list.push_back(def);
	def_it.remove();
      }
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    }
    else
    {						// Use old field value
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      create_list.push_back(def=new create_field(field,field));
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      if (def->sql_type == FIELD_TYPE_TIMESTAMP)
	use_timestamp=1;

      alter_it.rewind();			// Change default if ALTER
      Alter_column *alter;
      while ((alter=alter_it++))
      {
	if (!my_strcasecmp(field->field_name, alter->name))
	  break;
      }
      if (alter)
      {
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        if (def->sql_type == FIELD_TYPE_BLOB)
        {
          my_error(ER_BLOB_CANT_HAVE_DEFAULT,MYF(0),def->change);
          DBUG_RETURN(-1);
        }
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	def->def=alter->def;			// Use new default
	alter_it.remove();
      }
    }
  }
  def_it.rewind();
  List_iterator<create_field> find_it(create_list);
  while ((def=def_it++))			// Add new columns
  {
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    if (def->change && ! def->field)
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    {
      my_error(ER_BAD_FIELD_ERROR,MYF(0),def->change,table_name);
      DBUG_RETURN(-1);
    }
    if (!def->after)
      create_list.push_back(def);
    else if (def->after == first_keyword)
      create_list.push_front(def);
    else
    {
      create_field *find;
      find_it.rewind();
      while ((find=find_it++))			// Add new columns
      {
	if (!my_strcasecmp(def->after, find->field_name))
	  break;
      }
      if (!find)
      {
	my_error(ER_BAD_FIELD_ERROR,MYF(0),def->after,table_name);
	DBUG_RETURN(-1);
      }
      find_it.after(def);			// Put element after this
    }
  }
  if (alter_list.elements)
  {
    my_error(ER_BAD_FIELD_ERROR,MYF(0),alter_list.head()->name,table_name);
    DBUG_RETURN(-1);
  }
  if (!create_list.elements)
  {
    my_error(ER_CANT_REMOVE_ALL_FIELDS,MYF(0));
    DBUG_RETURN(-1);
  }

  /*
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    Collect all keys which isn't in drop list. Add only those
    for which some fields exists.
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  */

  List_iterator<Key> key_it(keys);
  List_iterator<create_field> field_it(create_list);
  List<key_part_spec> key_parts;

  KEY *key_info=table->key_info;
  for (uint i=0 ; i < table->keys ; i++,key_info++)
  {
    if (drop_primary && (key_info->flags & HA_NOSAME))
    {
      drop_primary=0;
      continue;
    }

    char *key_name=key_info->name;
    Alter_drop *drop;
    drop_it.rewind();
    while ((drop=drop_it++))
    {
      if (drop->type == Alter_drop::KEY &&
	  !my_strcasecmp(key_name, drop->name))
	break;
    }
    if (drop)
    {
      drop_it.remove();
      continue;
    }

    KEY_PART_INFO *key_part= key_info->key_part;
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    enum Key::Keytype key_type= key_info->flags & HA_NOSAME ?
				 (!my_strcasecmp(key_name, "PRIMARY") ?
				  Key::PRIMARY  : Key::UNIQUE) :
                                 (key_info->flags & HA_FULLTEXT ?
                                 Key::FULLTEXT : Key::MULTIPLE);
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    key_parts.empty();
    for (uint j=0 ; j < key_info->key_parts ; j++,key_part++)
    {
      if (!key_part->field)
	continue;				// Wrong field (from UNIREG)
      const char *key_part_name=key_part->field->field_name;
      create_field *cfield;
      field_it.rewind();
      while ((cfield=field_it++))
      {
	if (cfield->change)
	{
	  if (!my_strcasecmp(key_part_name, cfield->change))
	    break;
	}
	else if (!my_strcasecmp(key_part_name, cfield->field_name))
	    break;
      }
      if (!cfield)
	continue;				// Field is removed
      uint key_part_length=key_part->length;
      if (cfield->field)			// Not new field
      {						// Check if sub key
	if (cfield->field->type() != FIELD_TYPE_BLOB &&
	    (cfield->field->pack_length() == key_part_length ||
	     cfield->length != cfield->pack_length ||
	     cfield->pack_length <= key_part_length))
	  key_part_length=0;			// Use whole field
      }
      key_parts.push_back(new key_part_spec(cfield->field_name,
					    key_part_length));
    }
    if (key_parts.elements)
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      key_list.push_back(new Key(key_type,key_name,key_parts));
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  }
  key_it.rewind();
  {
    Key *key;
    while ((key=key_it++))			// Add new keys
      key_list.push_back(key);
  }

  if (drop_list.elements)
  {
    my_error(ER_CANT_DROP_FIELD_OR_KEY,MYF(0),drop_list.head()->name);
    goto err;
  }
  if (alter_list.elements)
  {
    my_error(ER_CANT_DROP_FIELD_OR_KEY,MYF(0),alter_list.head()->name);
    goto err;
  }

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  db_create_options=table->db_create_options & ~(HA_OPTION_PACK_RECORD);
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  (void) sprintf(tmp_name,"%s-%lx_%lx", tmp_file_prefix, current_pid,
		 thd->thread_id);
  create_info->db_type=new_db_type;
  if (!create_info->comment)
    create_info->comment=table->comment;
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  /* let new create options override the old ones */
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  if (!(used_fields & HA_CREATE_USED_MIN_ROWS))
    create_info->min_rows=table->min_rows;
  if (!(used_fields & HA_CREATE_USED_MAX_ROWS))
    create_info->max_rows=table->max_rows;
  if (!(used_fields & HA_CREATE_USED_AVG_ROW_LENGTH))
    create_info->avg_row_length=table->avg_row_length;

  table->file->update_create_info(create_info);
  if ((create_info->table_options &
       (HA_OPTION_PACK_KEYS | HA_OPTION_NO_PACK_KEYS)) ||
      (used_fields & HA_CREATE_USED_PACK_KEYS))
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    db_create_options&= ~(HA_OPTION_PACK_KEYS | HA_OPTION_NO_PACK_KEYS);
  if (create_info->table_options &
      (HA_OPTION_CHECKSUM | HA_OPTION_NO_CHECKSUM))
    db_create_options&= ~(HA_OPTION_CHECKSUM | HA_OPTION_NO_CHECKSUM);
  if (create_info->table_options &
      (HA_OPTION_DELAY_KEY_WRITE | HA_OPTION_NO_DELAY_KEY_WRITE))
    db_create_options&= ~(HA_OPTION_DELAY_KEY_WRITE |
			  HA_OPTION_NO_DELAY_KEY_WRITE);
  create_info->table_options|= db_create_options;

  if (table->tmp_table)
    create_info->options|=HA_LEX_CREATE_TMP_TABLE;

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  /*
    Handling of symlinked tables:
    If no rename:
      Create new data file and index file on the same disk as the
      old data and index files.
      Copy data.
      Rename new data file over old data file and new index file over
      old index file.
      Symlinks are not changed.

   If rename:
      Create new data file and index file on the same disk as the
      old data and index files.  Create also symlinks to point at
      the new tables.
      Copy data.
      At end, rename temporary tables and symlinks to temporary table
      to final table name.
      Remove old table and old symlinks

    If rename is made to another database:
      Create new tables in new database.
      Copy data.
      Remove old table and symlinks.
  */

  if (!strcmp(db, new_db))		// Ignore symlink if db changed
  {
    if (create_info->index_file_name)
    {
      /* Fix index_file_name to have 'tmp_name' as basename */
      strmov(index_file, tmp_name);
      create_info->index_file_name=fn_same(index_file,
					   create_info->index_file_name,
					   1);
    }
    if (create_info->data_file_name)
    {
      /* Fix data_file_name to have 'tmp_name' as basename */
      strmov(data_file, tmp_name);
      create_info->data_file_name=fn_same(data_file,
					  create_info->data_file_name,
					  1);
    }
  }
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  else
    create_info->data_file_name=create_info->index_file_name=0;
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  {
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    /* We don't log the statement, it will be logged later. */
    tmp_disable_binlog(thd);
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    error= mysql_create_table(thd, new_db, tmp_name,
                              create_info,create_list,key_list,1);
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    reenable_binlog(thd);
    if (error)
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      DBUG_RETURN(error);
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  }
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  if (table->tmp_table)
    new_table=open_table(thd,new_db,tmp_name,tmp_name,0);
  else
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  {
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    char path[FN_REFLEN];
    (void) sprintf(path,"%s/%s/%s",mysql_data_home,new_db,tmp_name);
    fn_format(path,path,"","",4);
    new_table=open_temporary_table(thd, path, new_db, tmp_name,0);
  }
  if (!new_table)
  {
    VOID(quick_rm_table(new_db_type,new_db,tmp_name));
    goto err;
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  }

  save_time_stamp=new_table->time_stamp;
  if (use_timestamp)
    new_table->time_stamp=0;
  new_table->next_number_field=new_table->found_next_number_field;
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  thd->count_cuted_fields=1;			// calc cuted fields
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  thd->cuted_fields=0L;
  thd->proc_info="copy to tmp table";
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  next_insert_id=thd->next_insert_id;		// Remember for loggin
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  copied=deleted=0;
  if (!new_table->is_view)
    error=copy_data_between_tables(table,new_table,create_list,
				   handle_duplicates,
				   order, &copied, &deleted);
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  thd->last_insert_id=next_insert_id;		// Needed for correct log
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  thd->count_cuted_fields=0;			// Don`t calc cuted fields
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  new_table->time_stamp=save_time_stamp;

  if (table->tmp_table)
  {
    /* We changed a temporary table */
    if (error)
    {
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      /*
	The following function call will free the new_table pointer,
	in close_temporary_table(), so we can safely directly jump to err
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      */
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      close_temporary_table(thd,new_db,tmp_name);
      goto err;
    }
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    /* Close lock if this is a transactional table */
    if (thd->lock)
    {
      mysql_unlock_tables(thd, thd->lock);
      thd->lock=0;
    }
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    /* Remove link to old table and rename the new one */
    close_temporary_table(thd,table->table_cache_key,table_name);
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    if (rename_temporary_table(thd, new_table, new_db, new_alias))
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    {						// Fatal error
      close_temporary_table(thd,new_db,tmp_name);
      my_free((gptr) new_table,MYF(0));
      goto err;
    }
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    mysql_update_log.write(thd, thd->query,thd->query_length);
    if (mysql_bin_log.is_open())
    {
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      thd->clear_error();
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      Query_log_event qinfo(thd, thd->query, thd->query_length, 0);
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      mysql_bin_log.write(&qinfo);
    }
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    goto end_temporary;
  }

  intern_close_table(new_table);		/* close temporary table */
  my_free((gptr) new_table,MYF(0));
  VOID(pthread_mutex_lock(&LOCK_open));
  if (error)
  {
    VOID(quick_rm_table(new_db_type,new_db,tmp_name));
    VOID(pthread_mutex_unlock(&LOCK_open));
    goto err;
  }
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  /*
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    Data is copied.  Now we rename the old table to a temp name,
    rename the new one to the old name, remove all entries from the old table
    from the cash, free all locks, close the old table and remove it.
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  */

  thd->proc_info="rename result table";
  sprintf(old_name,"%s2-%lx-%lx", tmp_file_prefix, current_pid,
	  thd->thread_id);
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  if (new_name != table_name || new_db != db)
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  {
    if (!access(new_name_buff,F_OK))
    {
      error=1;
      my_error(ER_TABLE_EXISTS_ERROR,MYF(0),new_name_buff);
      VOID(quick_rm_table(new_db_type,new_db,tmp_name));
      VOID(pthread_mutex_unlock(&LOCK_open));
      goto err;
    }
  }

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#if (!defined( __WIN__) && !defined( __EMX__) && !defined( OS2))
  if (table->file->has_transactions())
#endif
  {
    /*
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      Win32 and InnoDB can't drop a table that is in use, so we must
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      close the original table at before doing the rename
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    */
    table_name=thd->strdup(table_name);		// must be saved
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    if (close_cached_table(thd, table))
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    {						// Aborted
      VOID(quick_rm_table(new_db_type,new_db,tmp_name));
      VOID(pthread_mutex_unlock(&LOCK_open));
      goto err;
    }
    table=0;					// Marker that table is closed
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  }
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#if (!defined( __WIN__) && !defined( __EMX__) && !defined( OS2))
  else
    table->file->extra(HA_EXTRA_FORCE_REOPEN);	// Don't use this file anymore
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#endif

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  error=0;
  if (mysql_rename_table(old_db_type,db,table_name,db,old_name))
  {
    error=1;
    VOID(quick_rm_table(new_db_type,new_db,tmp_name));
  }
  else if (mysql_rename_table(new_db_type,new_db,tmp_name,new_db,
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			      new_alias))
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  {						// Try to get everything back
    error=1;
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    VOID(quick_rm_table(new_db_type,new_db,new_alias));
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    VOID(quick_rm_table(new_db_type,new_db,tmp_name));
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    VOID(mysql_rename_table(old_db_type,db,old_name,db,alias));
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  }
  if (error)
  {
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    /*
      This shouldn't happen.  We solve this the safe way by
      closing the locked table.
    */
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    if (table)
      close_cached_table(thd,table);
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    VOID(pthread_mutex_unlock(&LOCK_open));
    goto err;
  }
  if (thd->lock || new_name != table_name)	// True if WIN32
  {
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    /*
      Not table locking or alter table with rename
      free locks and remove old table
    */
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    if (table)
      close_cached_table(thd,table);
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    VOID(quick_rm_table(old_db_type,db,old_name));
  }
  else
  {
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    /*
      Using LOCK TABLES without rename.
      This code is never executed on WIN32!
      Remove old renamed table, reopen table and get new locks
    */
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    if (table)
    {
      VOID(table->file->extra(HA_EXTRA_FORCE_REOPEN)); // Use new file
      remove_table_from_cache(thd,db,table_name); // Mark all in-use copies old
      mysql_lock_abort(thd,table);		 // end threads waiting on lock
    }
    VOID(quick_rm_table(old_db_type,db,old_name));
    if (close_data_tables(thd,db,table_name) ||
	reopen_tables(thd,1,0))
    {						// This shouldn't happen
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      if (table)
	close_cached_table(thd,table);		// Remove lock for table
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      VOID(pthread_mutex_unlock(&LOCK_open));
      goto err;
    }
  }
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  /* The ALTER TABLE is always in it's own transaction */
  error = ha_commit_stmt(thd);
  if (ha_commit(thd))
    error=1;
  if (error)
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  {
    VOID(pthread_mutex_unlock(&LOCK_open));
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    VOID(pthread_cond_broadcast(&COND_refresh));
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    goto err;
  }
  thd->proc_info="end";
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  mysql_update_log.write(thd, thd->query,thd->query_length);
  if (mysql_bin_log.is_open())
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  {
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    thd->clear_error();
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    Query_log_event qinfo(thd, thd->query, thd->query_length, 0);
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    mysql_bin_log.write(&qinfo);
  }
  VOID(pthread_cond_broadcast(&COND_refresh));
  VOID(pthread_mutex_unlock(&LOCK_open));
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#ifdef HAVE_BERKELEY_DB
  if (old_db_type == DB_TYPE_BERKELEY_DB)
  {
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    /*
      For the alter table to be properly flushed to the logs, we
      have to open the new table.  If not, we get a problem on server
      shutdown.
    */
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    char path[FN_REFLEN];
    (void) sprintf(path,"%s/%s/%s",mysql_data_home,new_db,table_name);
    fn_format(path,path,"","",4);
    table=open_temporary_table(thd, path, new_db, tmp_name,0);
    if (table)
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    {
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      intern_close_table(table);
      my_free((char*) table, MYF(0));
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    }
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    else
      sql_print_error("Warning: Could not open BDB table %s.%s after rename\n",
		      new_db,table_name);
    (void) berkeley_flush_logs();
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  }
#endif
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  table_list->table=0;				// For query cache
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  query_cache_invalidate3(thd, table_list, 0);
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end_temporary:
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  sprintf(tmp_name,ER(ER_INSERT_INFO),(ulong) (copied+deleted),
	  (ulong) deleted, thd->cuted_fields);
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  send_ok(&thd->net,copied+deleted,0L,tmp_name);
  thd->some_tables_deleted=0;
  DBUG_RETURN(0);

 err:
  DBUG_RETURN(-1);
}


static int
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copy_data_between_tables(TABLE *from,TABLE *to,
                         List<create_field> &create,
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			 enum enum_duplicates handle_duplicates,
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                         ORDER *order,
			 ha_rows *copied,
                         ha_rows *deleted)
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{
  int error;
  Copy_field *copy,*copy_end;
  ulong found_count,delete_count;
  THD *thd= current_thd;
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  uint length;
  SORT_FIELD *sortorder;
  READ_RECORD info;
  Field *next_field;
  TABLE_LIST   tables;
  List<Item>   fields;
  List<Item>   all_fields;
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  ha_rows examined_rows;
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  DBUG_ENTER("copy_data_between_tables");

  if (!(copy= new Copy_field[to->fields]))
    DBUG_RETURN(-1);				/* purecov: inspected */

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  if (to->file->external_lock(thd, F_WRLCK))
    DBUG_RETURN(-1);
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  to->file->extra(HA_EXTRA_WRITE_CACHE);
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  from->file->info(HA_STATUS_VARIABLE);
  to->file->deactivate_non_unique_index(from->file->records);
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  List_iterator<create_field> it(create);
  create_field *def;
  copy_end=copy;
  for (Field **ptr=to->field ; *ptr ; ptr++)
  {
    def=it++;
    if (def->field)
      (copy_end++)->set(*ptr,def->field,0);
  }

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  found_count=delete_count=0;

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  if (order)
  {
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    from->io_cache=(IO_CACHE*) my_malloc(sizeof(IO_CACHE),
                                         MYF(MY_FAE | MY_ZEROFILL));
    bzero((char*) &tables,sizeof(tables));
    tables.table = from;
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    tables.alias = tables.real_name= from->real_name;
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    tables.db	 = from->table_cache_key;
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    error=1;

    if (setup_order(thd, &tables, fields, all_fields, order) ||
        !(sortorder=make_unireg_sortorder(order, &length)) ||
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        (from->found_records = filesort(from, sortorder, length, 
					(SQL_SELECT *) 0, 0L, HA_POS_ERROR,
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					&examined_rows))
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        == HA_POS_ERROR)
      goto err;
  };

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  /* Turn off recovery logging since rollback of an
     alter table is to delete the new table so there
     is no need to log the changes to it.              */
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  error = ha_recovery_logging(thd,FALSE);
2250
  if (error)
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  {
    error = 1;
    goto err;
  }

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  init_read_record(&info, thd, from, (SQL_SELECT *) 0, 1,1);
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  if (handle_duplicates == DUP_IGNORE ||
      handle_duplicates == DUP_REPLACE)
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    to->file->extra(HA_EXTRA_IGNORE_DUP_KEY);
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  next_field=to->next_number_field;
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  while (!(error=info.read_record(&info)))
  {
    if (thd->killed)
    {
      my_error(ER_SERVER_SHUTDOWN,MYF(0));
      error= 1;
      break;
    }
    if (next_field)
      next_field->reset();
    for (Copy_field *copy_ptr=copy ; copy_ptr != copy_end ; copy_ptr++)
      copy_ptr->do_copy(copy_ptr);
    if ((error=to->file->write_row((byte*) to->record[0])))
    {
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      if ((handle_duplicates != DUP_IGNORE &&
	   handle_duplicates != DUP_REPLACE) ||
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	  (error != HA_ERR_FOUND_DUPP_KEY &&
	   error != HA_ERR_FOUND_DUPP_UNIQUE))
      {
	to->file->print_error(error,MYF(0));
	break;
      }
      delete_count++;
    }
    else
      found_count++;
  }
  end_read_record(&info);
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  free_io_cache(from);
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  delete [] copy;				// This is never 0
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  uint tmp_error;
  if ((tmp_error=to->file->extra(HA_EXTRA_NO_CACHE)))
  {
    to->file->print_error(tmp_error,MYF(0));
    error=1;
  }
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  to->file->extra(HA_EXTRA_NO_IGNORE_DUP_KEY);
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  if (to->file->activate_all_index(thd))
    error=1;
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  tmp_error = ha_recovery_logging(thd,TRUE);
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  /*
    Ensure that the new table is saved properly to disk so that we
    can do a rename
  */
  if (ha_commit_stmt(thd))
    error=1;
  if (ha_commit(thd))
    error=1;
2310

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 err:
  free_io_cache(from);
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  *copied= found_count;
  *deleted=delete_count;
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  if (to->file->external_lock(thd,F_UNLCK))
    error=1;
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  DBUG_RETURN(error > 0 ? -1 : 0);
}