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/* Copyright (C) 2000 MySQL AB & MySQL Finland AB & TCX DataKonsult AB
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 */
/* Delete of records */
#include "mysql_priv.h"
#include "ha_innobase.h"
/*
Optimize delete of all rows by doing a full generate of the table
This will work even if the .ISM and .ISD tables are destroyed
*/
int generate_table(THD *thd, TABLE_LIST *table_list, TABLE *locked_table)
{
char path[FN_REFLEN];
int error;
TABLE **table_ptr;
DBUG_ENTER("generate_table");
thd->proc_info="generate_table";
if (global_read_lock)
{
if(thd->global_read_lock)
{
my_error(ER_TABLE_NOT_LOCKED_FOR_WRITE,MYF(0),
table_list->real_name);
DBUG_RETURN(-1);
}
pthread_mutex_lock(&LOCK_open);
while (global_read_lock && ! thd->killed ||
thd->version != refresh_version)
{
(void) pthread_cond_wait(&COND_refresh,&LOCK_open);
}
pthread_mutex_unlock(&LOCK_open);
}
/* If it is a temporary table, close and regenerate it */
if ((table_ptr=find_temporary_table(thd,table_list->db,
table_list->real_name)))
{
TABLE *table= *table_ptr;
HA_CREATE_INFO create_info;
table->file->info(HA_STATUS_AUTO | HA_STATUS_NO_LOCK);
bzero((char*) &create_info,sizeof(create_info));
create_info.auto_increment_value= table->file->auto_increment_value;
db_type table_type=table->db_type;
strmov(path,table->path);
*table_ptr= table->next; // Unlink table from list
close_temporary(table,0);
*fn_ext(path)=0; // Remove the .frm extension
ha_create_table(path, &create_info,1);
if ((error= (int) !(open_temporary_table(thd, path, table_list->db,
table_list->real_name, 1))))
{
(void) rm_temporary_table(table_type, path);
}
}
else
{
(void) sprintf(path,"%s/%s/%s%s",mysql_data_home,table_list->db,
table_list->real_name,reg_ext);
fn_format(path,path,"","",4);
VOID(pthread_mutex_lock(&LOCK_open));
if (locked_table)
mysql_lock_abort(thd,locked_table); // end threads waiting on lock
// close all copies in use
if (remove_table_from_cache(thd,table_list->db,table_list->real_name))
{
if (!locked_table)
{
VOID(pthread_mutex_unlock(&LOCK_open));
DBUG_RETURN(1); // We must get a lock on table
}
}
if (locked_table)
locked_table->file->extra(HA_EXTRA_FORCE_REOPEN);
if (thd->locked_tables)
close_data_tables(thd,table_list->db,table_list->real_name);
else
close_thread_tables(thd,1);
HA_CREATE_INFO create_info;
bzero((char*) &create_info,sizeof(create_info));
*fn_ext(path)=0; // Remove the .frm extension
error= ha_create_table(path,&create_info,1) ? -1 : 0;
if (thd->locked_tables && reopen_tables(thd,1,0))
error= -1;
VOID(pthread_mutex_unlock(&LOCK_open));
}
if (!error)
{
mysql_update_log.write(thd,thd->query,thd->query_length);
if (mysql_bin_log.is_open())
{
Query_log_event qinfo(thd, thd->query);
mysql_bin_log.write(&qinfo);
}
send_ok(&thd->net); // This should return record count
}
DBUG_RETURN(error ? -1 : 0);
}
int mysql_delete(THD *thd,TABLE_LIST *table_list,COND *conds,ha_rows limit,
thr_lock_type lock_type, ulong options)
{
int error;
TABLE *table;
SQL_SELECT *select;
READ_RECORD info;
bool using_limit=limit != HA_POS_ERROR;
bool use_generate_table,using_transactions;
DBUG_ENTER("mysql_delete");
if (!table_list->db)
table_list->db=thd->db;
if ((thd->options & OPTION_SAFE_UPDATES) && !conds)
{
send_error(&thd->net,ER_UPDATE_WITHOUT_KEY_IN_SAFE_MODE);
DBUG_RETURN(1);
}
use_generate_table= (!using_limit && !conds &&
!(specialflag &
(SPECIAL_NO_NEW_FUNC | SPECIAL_SAFE_MODE)) &&
!(thd->options &
(OPTION_NOT_AUTO_COMMIT | OPTION_BEGIN)));
#ifdef HAVE_INNOBASE_DB
/* We need to add code to not generate table based on the table type */
if (!innobase_skip)
use_generate_table=0; // Innobase can't use re-generate table
#endif
if (use_generate_table && ! thd->open_tables)
{
error=generate_table(thd,table_list,(TABLE*) 0);
if (error <= 0)
DBUG_RETURN(error); // Error or ok
}
if (!(table = open_ltable(thd,table_list,
limit != HA_POS_ERROR ? TL_WRITE_LOW_PRIORITY :
lock_type)))
DBUG_RETURN(-1);
table->file->info(HA_STATUS_VARIABLE | HA_STATUS_NO_LOCK);
thd->proc_info="init";
if (use_generate_table)
DBUG_RETURN(generate_table(thd,table_list,table));
table->map=1;
if (setup_conds(thd,table_list,&conds))
DBUG_RETURN(-1);
table->used_keys=table->quick_keys=0; // Can't use 'only index'
select=make_select(table,0,0,conds,&error);
if (error)
DBUG_RETURN(-1);
if (select && select->check_quick(test(thd->options & SQL_SAFE_UPDATES),
limit))
{
delete select;
send_ok(&thd->net,0L);
DBUG_RETURN(0);
}
/* If running in safe sql mode, don't allow updates without keys */
if (!table->quick_keys)
{
thd->lex.options|=QUERY_NO_INDEX_USED;
if ((thd->options & OPTION_SAFE_UPDATES) && limit == HA_POS_ERROR)
{
delete select;
send_error(&thd->net,ER_UPDATE_WITHOUT_KEY_IN_SAFE_MODE);
DBUG_RETURN(1);
}
}
(void) table->file->extra(HA_EXTRA_NO_READCHECK);
if (options & OPTION_QUICK)
(void) table->file->extra(HA_EXTRA_QUICK);
init_read_record(&info,thd,table,select,-1,1);
ulong deleted=0L;
thd->proc_info="updating";
while (!(error=info.read_record(&info)) && !thd->killed)
{
if (!(select && select->skipp_record()))
{
if (!(error=table->file->delete_row(table->record[0])))
{
deleted++;
if (!--limit && using_limit)
{
error= -1;
break;
}
}
else
{
table->file->print_error(error,MYF(0));
error=0;
break;
}
}
}
thd->proc_info="end";
end_read_record(&info);
(void) table->file->extra(HA_EXTRA_READCHECK);
if (options & OPTION_QUICK)
(void) table->file->extra(HA_EXTRA_NORMAL);
using_transactions=table->file->has_transactions();
if (deleted && (error <= 0 || !using_transactions))
{
mysql_update_log.write(thd,thd->query, thd->query_length);
if (mysql_bin_log.is_open())
{
Query_log_event qinfo(thd, thd->query, using_transactions);
if (mysql_bin_log.write(&qinfo) && using_transactions)
error=1;
}
if (!using_transactions)
thd->options|=OPTION_STATUS_NO_TRANS_UPDATE;
}
if (using_transactions && ha_autocommit_or_rollback(thd,error >= 0))
error=1;
if (thd->lock)
{
mysql_unlock_tables(thd, thd->lock);
thd->lock=0;
}
delete select;
if (error >= 0) // Fatal error
send_error(&thd->net,thd->killed ? ER_SERVER_SHUTDOWN: 0);
else
{
send_ok(&thd->net,deleted);
DBUG_PRINT("info",("%d records deleted",deleted));
}
DBUG_RETURN(0);
}
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