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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 */
/* Update of records */
#include "mysql_priv.h"
#include "sql_acl.h"
/* Return 0 if row hasn't changed */
static bool compare_record(TABLE *table)
{
if (!table->blob_fields)
return cmp_record(table,1);
ulong current_query_id=current_thd->query_id;
if (memcmp(table->null_flags,
table->null_flags+table->rec_buff_length,
table->null_bytes))
return 1; // Diff in NULL value
for (Field **ptr=table->field ; *ptr ; ptr++)
{
if ((*ptr)->query_id == current_query_id &&
(*ptr)->cmp_binary_offset(table->rec_buff_length))
return 1;
}
return 0;
}
int mysql_update(THD *thd,TABLE_LIST *table_list,List<Item> &fields,
List<Item> &values, COND *conds,
ha_rows limit,
enum enum_duplicates handle_duplicates,
thr_lock_type lock_type)
{
bool using_limit=limit != HA_POS_ERROR;
bool used_key_is_modified;
int error=0;
uint save_time_stamp, used_index;
key_map old_used_keys;
TABLE *table;
SQL_SELECT *select;
READ_RECORD info;
DBUG_ENTER("mysql_update");
LINT_INIT(used_index);
if (!(table = open_ltable(thd,table_list,lock_type)))
DBUG_RETURN(-1);
save_time_stamp=table->time_stamp;
table->file->info(HA_STATUS_VARIABLE | HA_STATUS_NO_LOCK);
thd->proc_info="init";
/*
** Find the offsets of the given fields and condition
*/
if (setup_fields(thd,table_list,fields,1,0))
DBUG_RETURN(-1);
table->grant.want_privilege=(SELECT_ACL & ~table->grant.privilege);
if (table->timestamp_field && // Don't set timestamp if used
table->timestamp_field->query_id == thd->query_id)
table->time_stamp=0;
table->used_keys=table->keys_in_use;
table->quick_keys=0;
if (setup_fields(thd,table_list,values,0,0) ||
setup_conds(thd,table_list,&conds))
{
table->time_stamp=save_time_stamp; // Restore timestamp pointer
DBUG_RETURN(-1); /* purecov: inspected */
}
old_used_keys=table->used_keys;
table->used_keys=0; // Can't use 'only index'
select=make_select(table,0,0,conds,&error);
if (error ||
(select && select->check_quick(test(thd->options & SQL_SAFE_UPDATES),
limit)))
{
delete select;
table->time_stamp=save_time_stamp; // Restore timestamp pointer
if (error)
{
DBUG_RETURN(-1); // Error in where
}
send_ok(&thd->net); // No matching records
DBUG_RETURN(0);
}
/* If running in safe sql mode, don't allow updates without keys */
if ((thd->options & OPTION_SAFE_UPDATES) && !table->quick_keys &&
limit == HA_POS_ERROR)
{
delete select;
table->time_stamp=save_time_stamp;
send_error(&thd->net,ER_UPDATE_WITHOUT_KEY_IN_SAFE_MODE);
DBUG_RETURN(1);
}
/* Check if we are modifying a key that we are used to search with */
if (select && select->quick)
used_key_is_modified= (!select->quick->unique_key_range() &&
check_if_key_used(table,
(used_index=select->quick->index),
fields));
else if ((used_index=table->file->key_used_on_scan) < MAX_KEY)
used_key_is_modified=check_if_key_used(table, used_index, fields);
else
used_key_is_modified=0;
if (used_key_is_modified)
{
/*
** We can't update table directly; We must first search after all
** matching rows before updating the table!
*/
IO_CACHE tempfile;
if (open_cached_file(&tempfile, mysql_tmpdir,TEMP_PREFIX,
DISK_BUFFER_SIZE, MYF(MY_WME)))
{
delete select;
table->time_stamp=save_time_stamp; // Restore timestamp pointer
DBUG_RETURN(-1);
}
if (old_used_keys & ((key_map) 1 << used_index))
{
table->key_read=1;
table->file->extra(HA_EXTRA_KEYREAD);
}
init_read_record(&info,thd,table,select,0,1);
thd->proc_info="searching";
while (!(error=info.read_record(&info)) && !thd->killed)
{
if (!(select && select->skipp_record()))
{
table->file->position(table->record[0]);
if (my_b_write(&tempfile,table->file->ref,
table->file->ref_length))
{
error=1;
break;
}
}
else
{
if (!(test_flags & 512)) /* For debugging */
{
DBUG_DUMP("record",(char*) table->record[0],table->reclength);
}
}
}
end_read_record(&info);
if (table->key_read)
{
table->key_read=0;
table->file->extra(HA_EXTRA_NO_KEYREAD);
}
/* Change select to use tempfile */
if (select)
{
delete select->quick;
if (select->free_cond)
delete select->cond;
select->quick=0;
select->cond=0;
}
else
{
select= new SQL_SELECT;
select->head=table;
}
if (reinit_io_cache(&tempfile,READ_CACHE,0L,0,0))
error=1;
select->file=tempfile; // Read row ptrs from this file
if (error >= 0)
{
delete select;
table->time_stamp=save_time_stamp; // Restore timestamp pointer
DBUG_RETURN(-1);
}
}
if (!(test_flags & TEST_READCHECK)) /* For debugging */
VOID(table->file->extra(HA_EXTRA_NO_READCHECK));
init_read_record(&info,thd,table,select,0,1);
ha_rows updated=0L,found=0L;
thd->count_cuted_fields=1; /* calc cuted fields */
thd->cuted_fields=0L;
thd->proc_info="updating";
while (!(error=info.read_record(&info)) && !thd->killed)
{
if (!(select && select->skipp_record()))
{
store_record(table,1);
if (fill_record(fields,values))
break;
found++;
if (compare_record(table))
{
if (!(error=table->file->update_row((byte*) table->record[1],
(byte*) table->record[0])))
{
updated++;
if (!--limit && using_limit)
{
error= -1;
break;
}
}
else if (handle_duplicates != DUP_IGNORE ||
error != HA_ERR_FOUND_DUPP_KEY)
{
table->file->print_error(error,MYF(0));
error= 1;
break;
}
}
}
}
end_read_record(&info);
thd->proc_info="end";
VOID(table->file->extra(HA_EXTRA_READCHECK));
table->time_stamp=save_time_stamp; // Restore auto timestamp pointer
if (updated)
{
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);
}
}
if (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)
send_error(&thd->net,thd->killed ? ER_SERVER_SHUTDOWN : 0); /* purecov: inspected */
else
{
char buff[80];
sprintf(buff,ER(ER_UPDATE_INFO), (long) found, (long) updated,
(long) thd->cuted_fields);
send_ok(&thd->net,
(thd->client_capabilities & CLIENT_FOUND_ROWS) ? found : updated,
thd->insert_id_used ? thd->insert_id() : 0L,buff);
DBUG_PRINT("info",("%d records updated",updated));
}
thd->count_cuted_fields=0; /* calc cuted fields */
DBUG_RETURN(0);
}
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