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mariadb/sql/sql_delete.cc
Georgi Kodinov 410e1a72b9 Bug #40113: Embedded SELECT inside UPDATE or DELETE can timeout 
without error

When using quick access methods for searching rows in UPDATE or 
DELETE there was no check if a fatal error was not already sent 
to the client while evaluating the quick condition.
As a result a false OK (following the error) was sent to the 
client and the error was thus transformed into a warning.

Fixed by checking for errors sent to the client during 
SQL_SELECT::check_quick() and treating them as real errors.

Fixed a wrong test case in group_min_max.test
Fixed a wrong return code in mysql_update() and mysql_delete()

mysql-test/r/bug40113.result:
  Bug #40013: test case
mysql-test/r/group_min_max.result:
  Bug #40013: fixed a wrong test case
mysql-test/t/bug40113-master.opt:
  Bug #40013: test case
mysql-test/t/bug40113.test:
  Bug #40013: test case
mysql-test/t/group_min_max.test:
  Bug #40013: fixed a wrong test case
sql/sql_delete.cc:
  Bug #40113: check for errors evaluating the quick select
sql/sql_update.cc:
  Bug #40113: check for errors evaluating the quick select
2009-07-13 18:11:16 +03:00

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/* Copyright (C) 2000 MySQL 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; version 2 of the License.
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 and truncate of tables.
Multi-table deletes were introduced by Monty and Sinisa
*/
#include "mysql_priv.h"
#include "ha_innodb.h"
#include "sql_select.h"
#include "sp_head.h"
#include "sql_trigger.h"
bool mysql_delete(THD *thd, TABLE_LIST *table_list, COND *conds,
SQL_LIST *order, ha_rows limit, ulonglong options,
bool reset_auto_increment)
{
int error;
TABLE *table;
SQL_SELECT *select=0;
READ_RECORD info;
bool using_limit=limit != HA_POS_ERROR;
bool transactional_table, safe_update, const_cond;
bool triggers_applicable;
ha_rows deleted;
uint usable_index= MAX_KEY;
SELECT_LEX *select_lex= &thd->lex->select_lex;
THD::killed_state killed_status= THD::NOT_KILLED;
DBUG_ENTER("mysql_delete");
if (open_and_lock_tables(thd, table_list))
DBUG_RETURN(TRUE);
if (!(table= table_list->table))
{
my_error(ER_VIEW_DELETE_MERGE_VIEW, MYF(0),
table_list->view_db.str, table_list->view_name.str);
DBUG_RETURN(TRUE);
}
error= table->file->info(HA_STATUS_VARIABLE | HA_STATUS_NO_LOCK);
if (error)
{
table->file->print_error(error, MYF(0));
DBUG_RETURN(error);
}
thd_proc_info(thd, "init");
table->map=1;
if (mysql_prepare_delete(thd, table_list, &conds))
DBUG_RETURN(TRUE);
/* check ORDER BY even if it can be ignored */
if (order && order->elements)
{
TABLE_LIST tables;
List<Item> fields;
List<Item> all_fields;
bzero((char*) &tables,sizeof(tables));
tables.table = table;
tables.alias = table_list->alias;
if (select_lex->setup_ref_array(thd, order->elements) ||
setup_order(thd, select_lex->ref_pointer_array, &tables,
fields, all_fields, (ORDER*) order->first))
{
delete select;
free_underlaid_joins(thd, &thd->lex->select_lex);
DBUG_RETURN(TRUE);
}
}
const_cond= (!conds || conds->const_item());
safe_update=test(thd->options & OPTION_SAFE_UPDATES);
if (safe_update && const_cond)
{
my_message(ER_UPDATE_WITHOUT_KEY_IN_SAFE_MODE,
ER(ER_UPDATE_WITHOUT_KEY_IN_SAFE_MODE), MYF(0));
DBUG_RETURN(TRUE);
}
select_lex->no_error= thd->lex->ignore;
/* NOTE: TRUNCATE must not invoke triggers. */
triggers_applicable= table->triggers &&
thd->lex->sql_command != SQLCOM_TRUNCATE;
/*
Test if the user wants to delete all rows and deletion doesn't have
any side-effects (because of triggers), so we can use optimized
handler::delete_all_rows() method.
We implement fast TRUNCATE for InnoDB even if triggers are present.
TRUNCATE ignores triggers.
*/
if (!using_limit && const_cond && (!conds || conds->val_int()) &&
!(specialflag & (SPECIAL_NO_NEW_FUNC | SPECIAL_SAFE_MODE)) &&
!(triggers_applicable && table->triggers->has_delete_triggers())
)
{
deleted= table->file->records;
if (!(error=table->file->delete_all_rows()))
{
error= -1; // ok
goto cleanup;
}
if (error != HA_ERR_WRONG_COMMAND)
{
table->file->print_error(error,MYF(0));
error=0;
goto cleanup;
}
/* Handler didn't support fast delete; Delete rows one by one */
}
if (conds)
{
Item::cond_result result;
conds= remove_eq_conds(thd, conds, &result);
if (result == Item::COND_FALSE) // Impossible where
limit= 0;
}
table->used_keys.clear_all();
table->quick_keys.clear_all(); // Can't use 'only index'
select=make_select(table, 0, 0, conds, 0, &error);
if (error)
DBUG_RETURN(TRUE);
if ((select && select->check_quick(thd, safe_update, limit)) || !limit)
{
delete select;
free_underlaid_joins(thd, select_lex);
thd->row_count_func= 0;
/*
Error was already created by quick select evaluation (check_quick()).
TODO: Add error code output parameter to Item::val_xxx() methods.
Currently they rely on the user checking DA for
errors when unwinding the stack after calling Item::val_xxx().
*/
if (thd->net.report_error)
DBUG_RETURN(TRUE);
send_ok(thd,0L);
/*
We don't need to call reset_auto_increment in this case, because
mysql_truncate always gives a NULL conds argument, hence we never
get here.
*/
DBUG_RETURN(0); // Nothing to delete
}
/* If running in safe sql mode, don't allow updates without keys */
if (table->quick_keys.is_clear_all())
{
thd->server_status|=SERVER_QUERY_NO_INDEX_USED;
if (safe_update && !using_limit)
{
delete select;
free_underlaid_joins(thd, select_lex);
my_message(ER_UPDATE_WITHOUT_KEY_IN_SAFE_MODE,
ER(ER_UPDATE_WITHOUT_KEY_IN_SAFE_MODE), MYF(0));
DBUG_RETURN(TRUE);
}
}
if (options & OPTION_QUICK)
(void) table->file->extra(HA_EXTRA_QUICK);
if (order && order->elements)
{
uint length= 0;
SORT_FIELD *sortorder;
ha_rows examined_rows;
if ((!select || table->quick_keys.is_clear_all()) && limit != HA_POS_ERROR)
usable_index= get_index_for_order(table, (ORDER*)(order->first), limit);
if (usable_index == MAX_KEY)
{
table->sort.io_cache= (IO_CACHE *) my_malloc(sizeof(IO_CACHE),
MYF(MY_FAE | MY_ZEROFILL));
if (!(sortorder= make_unireg_sortorder((ORDER*) order->first,
&length, NULL)) ||
(table->sort.found_records = filesort(thd, table, sortorder, length,
select, HA_POS_ERROR,
&examined_rows))
== HA_POS_ERROR)
{
delete select;
free_underlaid_joins(thd, &thd->lex->select_lex);
DBUG_RETURN(TRUE);
}
/*
Filesort has already found and selected the rows we want to delete,
so we don't need the where clause
*/
delete select;
free_underlaid_joins(thd, select_lex);
select= 0;
}
}
/* If quick select is used, initialize it before retrieving rows. */
if (select && select->quick && select->quick->reset())
{
delete select;
free_underlaid_joins(thd, select_lex);
DBUG_RETURN(TRUE);
}
if (usable_index==MAX_KEY)
init_read_record(&info, thd, table, select, 1, 1, FALSE);
else
init_read_record_idx(&info, thd, table, 1, usable_index);
deleted=0L;
init_ftfuncs(thd, select_lex, 1);
thd_proc_info(thd, "updating");
if (triggers_applicable)
{
table->triggers->mark_fields_used(thd, TRG_EVENT_DELETE);
if (table->triggers->has_triggers(TRG_EVENT_DELETE,
TRG_ACTION_AFTER))
{
/*
The table has AFTER DELETE triggers that might access to subject table
and therefore might need delete to be done immediately. So we turn-off
the batching.
*/
(void) table->file->extra(HA_EXTRA_DELETE_CANNOT_BATCH);
}
}
while (!(error=info.read_record(&info)) && !thd->killed &&
!thd->net.report_error)
{
// thd->net.report_error is tested to disallow delete row on error
if (!(select && select->skip_record())&& !thd->net.report_error )
{
if (triggers_applicable &&
table->triggers->process_triggers(thd, TRG_EVENT_DELETE,
TRG_ACTION_BEFORE, FALSE))
{
error= 1;
break;
}
if (!(error=table->file->delete_row(table->record[0])))
{
deleted++;
if (triggers_applicable &&
table->triggers->process_triggers(thd, TRG_EVENT_DELETE,
TRG_ACTION_AFTER, FALSE))
{
error= 1;
break;
}
if (!--limit && using_limit)
{
error= -1;
break;
}
}
else
{
table->file->print_error(error,MYF(0));
/*
In < 4.0.14 we set the error number to 0 here, but that
was not sensible, because then MySQL would not roll back the
failed DELETE, and also wrote it to the binlog. For MyISAM
tables a DELETE probably never should fail (?), but for
InnoDB it can fail in a FOREIGN KEY error or an
out-of-tablespace error.
*/
error= 1;
break;
}
}
else
table->file->unlock_row(); // Row failed selection, release lock on it
}
killed_status= thd->killed;
error= (killed_status == THD::NOT_KILLED)? error : 1;
thd_proc_info(thd, "end");
end_read_record(&info);
free_io_cache(table); // Will not do any harm
if (options & OPTION_QUICK)
(void) table->file->extra(HA_EXTRA_NORMAL);
if (reset_auto_increment && (error < 0))
{
/*
We're really doing a truncate and need to reset the table's
auto-increment counter.
*/
int error2= table->file->reset_auto_increment(0);
if (error2 && (error2 != HA_ERR_WRONG_COMMAND))
{
table->file->print_error(error2, MYF(0));
error= 1;
}
}
cleanup:
/*
Invalidate the table in the query cache if something changed. This must
be before binlog writing and ha_autocommit_...
*/
if (deleted)
{
query_cache_invalidate3(thd, table_list, 1);
}
delete select;
transactional_table= table->file->has_transactions();
if (!transactional_table && deleted > 0)
thd->transaction.stmt.modified_non_trans_table= TRUE;
/* See similar binlogging code in sql_update.cc, for comments */
if ((error < 0) || thd->transaction.stmt.modified_non_trans_table)
{
if (mysql_bin_log.is_open())
{
if (error < 0)
thd->clear_error();
Query_log_event qinfo(thd, thd->query, thd->query_length,
transactional_table, FALSE, killed_status);
if (mysql_bin_log.write(&qinfo) && transactional_table)
error=1;
}
if (thd->transaction.stmt.modified_non_trans_table)
thd->transaction.all.modified_non_trans_table= TRUE;
}
DBUG_ASSERT(transactional_table || !deleted || thd->transaction.stmt.modified_non_trans_table);
free_underlaid_joins(thd, select_lex);
if (transactional_table)
{
if (ha_autocommit_or_rollback(thd,error >= 0))
error=1;
}
if (thd->lock)
{
mysql_unlock_tables(thd, thd->lock);
thd->lock=0;
}
if (error < 0 || (thd->lex->ignore && !thd->is_fatal_error))
{
thd->row_count_func= deleted;
send_ok(thd,deleted);
DBUG_PRINT("info",("%ld records deleted",(long) deleted));
}
DBUG_RETURN(error >= 0 || thd->net.report_error);
}
/*
Prepare items in DELETE statement
SYNOPSIS
mysql_prepare_delete()
thd - thread handler
table_list - global/local table list
conds - conditions
RETURN VALUE
FALSE OK
TRUE error
*/
int mysql_prepare_delete(THD *thd, TABLE_LIST *table_list, Item **conds)
{
Item *fake_conds= 0;
SELECT_LEX *select_lex= &thd->lex->select_lex;
DBUG_ENTER("mysql_prepare_delete");
List<Item> all_fields;
thd->lex->allow_sum_func= 0;
if (setup_tables_and_check_access(thd, &thd->lex->select_lex.context,
&thd->lex->select_lex.top_join_list,
table_list, conds,
&select_lex->leaf_tables, FALSE,
DELETE_ACL, SELECT_ACL) ||
setup_conds(thd, table_list, select_lex->leaf_tables, conds) ||
setup_ftfuncs(select_lex))
DBUG_RETURN(TRUE);
if (!table_list->updatable || check_key_in_view(thd, table_list))
{
my_error(ER_NON_UPDATABLE_TABLE, MYF(0), table_list->alias, "DELETE");
DBUG_RETURN(TRUE);
}
{
TABLE_LIST *duplicate;
if ((duplicate= unique_table(thd, table_list, table_list->next_global, 0)))
{
update_non_unique_table_error(table_list, "DELETE", duplicate);
DBUG_RETURN(TRUE);
}
}
if (select_lex->inner_refs_list.elements &&
fix_inner_refs(thd, all_fields, select_lex, select_lex->ref_pointer_array))
DBUG_RETURN(TRUE);
select_lex->fix_prepare_information(thd, conds, &fake_conds);
DBUG_RETURN(FALSE);
}
/***************************************************************************
Delete multiple tables from join
***************************************************************************/
#define MEM_STRIP_BUF_SIZE current_thd->variables.sortbuff_size
extern "C" int refpos_order_cmp(void* arg, const void *a,const void *b)
{
handler *file= (handler*)arg;
return file->cmp_ref((const byte*)a, (const byte*)b);
}
/*
make delete specific preparation and checks after opening tables
SYNOPSIS
mysql_multi_delete_prepare()
thd thread handler
RETURN
FALSE OK
TRUE Error
*/
int mysql_multi_delete_prepare(THD *thd)
{
LEX *lex= thd->lex;
TABLE_LIST *aux_tables= (TABLE_LIST *)lex->auxiliary_table_list.first;
TABLE_LIST *target_tbl;
DBUG_ENTER("mysql_multi_delete_prepare");
/*
setup_tables() need for VIEWs. JOIN::prepare() will not do it second
time.
lex->query_tables also point on local list of DELETE SELECT_LEX
*/
if (setup_tables_and_check_access(thd, &thd->lex->select_lex.context,
&thd->lex->select_lex.top_join_list,
lex->query_tables, &lex->select_lex.where,
&lex->select_lex.leaf_tables, FALSE,
DELETE_ACL, SELECT_ACL))
DBUG_RETURN(TRUE);
/*
Multi-delete can't be constructed over-union => we always have
single SELECT on top and have to check underlying SELECTs of it
*/
lex->select_lex.exclude_from_table_unique_test= TRUE;
/* Fix tables-to-be-deleted-from list to point at opened tables */
for (target_tbl= (TABLE_LIST*) aux_tables;
target_tbl;
target_tbl= target_tbl->next_local)
{
if (!(target_tbl->table= target_tbl->correspondent_table->table))
{
DBUG_ASSERT(target_tbl->correspondent_table->view &&
target_tbl->correspondent_table->merge_underlying_list &&
target_tbl->correspondent_table->merge_underlying_list->
next_local);
my_error(ER_VIEW_DELETE_MERGE_VIEW, MYF(0),
target_tbl->correspondent_table->view_db.str,
target_tbl->correspondent_table->view_name.str);
DBUG_RETURN(TRUE);
}
if (!target_tbl->correspondent_table->updatable ||
check_key_in_view(thd, target_tbl->correspondent_table))
{
my_error(ER_NON_UPDATABLE_TABLE, MYF(0),
target_tbl->table_name, "DELETE");
DBUG_RETURN(TRUE);
}
/*
Check that table from which we delete is not used somewhere
inside subqueries/view.
*/
{
TABLE_LIST *duplicate;
if ((duplicate= unique_table(thd, target_tbl->correspondent_table,
lex->query_tables, 0)))
{
update_non_unique_table_error(target_tbl->correspondent_table,
"DELETE", duplicate);
DBUG_RETURN(TRUE);
}
}
}
/*
Reset the exclude flag to false so it doesn't interfare
with further calls to unique_table
*/
lex->select_lex.exclude_from_table_unique_test= FALSE;
DBUG_RETURN(FALSE);
}
multi_delete::multi_delete(TABLE_LIST *dt, uint num_of_tables_arg)
: delete_tables(dt), deleted(0), found(0),
num_of_tables(num_of_tables_arg), error(0),
do_delete(0), transactional_tables(0), normal_tables(0), error_handled(0)
{
tempfiles= (Unique **) sql_calloc(sizeof(Unique *) * num_of_tables);
}
int
multi_delete::prepare(List<Item> &values, SELECT_LEX_UNIT *u)
{
DBUG_ENTER("multi_delete::prepare");
unit= u;
do_delete= 1;
thd_proc_info(thd, "deleting from main table");
DBUG_RETURN(0);
}
bool
multi_delete::initialize_tables(JOIN *join)
{
TABLE_LIST *walk;
Unique **tempfiles_ptr;
DBUG_ENTER("initialize_tables");
if ((thd->options & OPTION_SAFE_UPDATES) && error_if_full_join(join))
DBUG_RETURN(1);
table_map tables_to_delete_from=0;
delete_while_scanning= 1;
for (walk= delete_tables; walk; walk= walk->next_local)
{
tables_to_delete_from|= walk->table->map;
if (delete_while_scanning &&
unique_table(thd, walk, join->tables_list, false))
{
/*
If the table we are going to delete from appears
in join, we need to defer delete. So the delete
doesn't interfers with the scaning of results.
*/
delete_while_scanning= 0;
}
}
walk= delete_tables;
for (JOIN_TAB *tab=join->join_tab, *end=join->join_tab+join->tables;
tab < end;
tab++)
{
if (tab->table->map & tables_to_delete_from)
{
/* We are going to delete from this table */
TABLE *tbl=walk->table=tab->table;
walk= walk->next_local;
/* Don't use KEYREAD optimization on this table */
tbl->no_keyread=1;
/* Don't use record cache */
tbl->no_cache= 1;
tbl->used_keys.clear_all();
if (tbl->file->has_transactions())
transactional_tables= 1;
else
normal_tables= 1;
if (tbl->triggers)
{
tbl->triggers->mark_fields_used(thd, TRG_EVENT_DELETE);
if (tbl->triggers->has_triggers(TRG_EVENT_DELETE,
TRG_ACTION_AFTER))
{
/*
The table has AFTER DELETE triggers that might access to subject
table and therefore might need delete to be done immediately.
So we turn-off the batching.
*/
(void) tbl->file->extra(HA_EXTRA_DELETE_CANNOT_BATCH);
}
}
}
else if ((tab->type != JT_SYSTEM && tab->type != JT_CONST) &&
walk == delete_tables)
{
/*
We are not deleting from the table we are scanning. In this
case send_data() shouldn't delete any rows a we may touch
the rows in the deleted table many times
*/
delete_while_scanning= 0;
}
}
walk= delete_tables;
tempfiles_ptr= tempfiles;
if (delete_while_scanning)
{
table_being_deleted= delete_tables;
walk= walk->next_local;
}
for (;walk ;walk= walk->next_local)
{
TABLE *table=walk->table;
*tempfiles_ptr++= new Unique (refpos_order_cmp,
(void *) table->file,
table->file->ref_length,
MEM_STRIP_BUF_SIZE);
}
init_ftfuncs(thd, thd->lex->current_select, 1);
DBUG_RETURN(thd->is_fatal_error != 0);
}
multi_delete::~multi_delete()
{
for (table_being_deleted= delete_tables;
table_being_deleted;
table_being_deleted= table_being_deleted->next_local)
{
TABLE *table= table_being_deleted->table;
free_io_cache(table); // Alloced by unique
table->no_keyread=0;
}
for (uint counter= 0; counter < num_of_tables; counter++)
{
if (tempfiles[counter])
delete tempfiles[counter];
}
}
bool multi_delete::send_data(List<Item> &values)
{
int secure_counter= delete_while_scanning ? -1 : 0;
TABLE_LIST *del_table;
DBUG_ENTER("multi_delete::send_data");
for (del_table= delete_tables;
del_table;
del_table= del_table->next_local, secure_counter++)
{
TABLE *table= del_table->table;
/* Check if we are using outer join and we didn't find the row */
if (table->status & (STATUS_NULL_ROW | STATUS_DELETED))
continue;
table->file->position(table->record[0]);
found++;
if (secure_counter < 0)
{
/* We are scanning the current table */
DBUG_ASSERT(del_table == table_being_deleted);
if (table->triggers &&
table->triggers->process_triggers(thd, TRG_EVENT_DELETE,
TRG_ACTION_BEFORE, FALSE))
DBUG_RETURN(1);
table->status|= STATUS_DELETED;
if (!(error=table->file->delete_row(table->record[0])))
{
deleted++;
if (!table->file->has_transactions())
thd->transaction.stmt.modified_non_trans_table= TRUE;
if (table->triggers &&
table->triggers->process_triggers(thd, TRG_EVENT_DELETE,
TRG_ACTION_AFTER, FALSE))
DBUG_RETURN(1);
}
else
{
table->file->print_error(error,MYF(0));
DBUG_RETURN(1);
}
}
else
{
error=tempfiles[secure_counter]->unique_add((char*) table->file->ref);
if (error)
{
error= 1; // Fatal error
DBUG_RETURN(1);
}
}
}
DBUG_RETURN(0);
}
void multi_delete::send_error(uint errcode,const char *err)
{
DBUG_ENTER("multi_delete::send_error");
/* First send error what ever it is ... */
my_message(errcode, err, MYF(0));
/* the error was handled or nothing deleted and no side effects return */
if (error_handled ||
(!thd->transaction.stmt.modified_non_trans_table && !deleted))
DBUG_VOID_RETURN;
/* Something already deleted so we have to invalidate cache */
if (deleted)
query_cache_invalidate3(thd, delete_tables, 1);
/*
If rows from the first table only has been deleted and it is
transactional, just do rollback.
The same if all tables are transactional, regardless of where we are.
In all other cases do attempt deletes ...
*/
if ((table_being_deleted == delete_tables &&
table_being_deleted->table->file->has_transactions()) ||
!normal_tables)
ha_rollback_stmt(thd);
else if (do_delete)
{
/*
We have to execute the recorded do_deletes() and write info into the
error log
*/
error= 1;
send_eof();
DBUG_ASSERT(error_handled);
DBUG_VOID_RETURN;
}
if (thd->transaction.stmt.modified_non_trans_table)
{
/*
there is only side effects; to binlog with the error
*/
if (mysql_bin_log.is_open())
{
Query_log_event qinfo(thd, thd->query, thd->query_length,
transactional_tables, FALSE, THD::KILLED_NO_VALUE);
mysql_bin_log.write(&qinfo);
}
thd->transaction.all.modified_non_trans_table= true;
}
DBUG_VOID_RETURN;
}
/*
Do delete from other tables.
Returns values:
0 ok
1 error
*/
int multi_delete::do_deletes()
{
int local_error= 0, counter= 0;
DBUG_ENTER("do_deletes");
DBUG_ASSERT(do_delete);
do_delete= 0; // Mark called
if (!found)
DBUG_RETURN(0);
table_being_deleted= (delete_while_scanning ? delete_tables->next_local :
delete_tables);
for (; table_being_deleted;
table_being_deleted= table_being_deleted->next_local, counter++)
{
ha_rows last_deleted= deleted;
TABLE *table = table_being_deleted->table;
if (tempfiles[counter]->get(table))
{
local_error=1;
break;
}
READ_RECORD info;
init_read_record(&info, thd, table, NULL, 0, 1, FALSE);
/*
Ignore any rows not found in reference tables as they may already have
been deleted by foreign key handling
*/
info.ignore_not_found_rows= 1;
while (!(local_error=info.read_record(&info)) && !thd->killed)
{
if (table->triggers &&
table->triggers->process_triggers(thd, TRG_EVENT_DELETE,
TRG_ACTION_BEFORE, FALSE))
{
local_error= 1;
break;
}
if ((local_error=table->file->delete_row(table->record[0])))
{
table->file->print_error(local_error,MYF(0));
break;
}
deleted++;
if (table->triggers &&
table->triggers->process_triggers(thd, TRG_EVENT_DELETE,
TRG_ACTION_AFTER, FALSE))
{
local_error= 1;
break;
}
}
if (last_deleted != deleted && !table->file->has_transactions())
thd->transaction.stmt.modified_non_trans_table= TRUE;
end_read_record(&info);
if (thd->killed && !local_error)
local_error= 1;
if (local_error == -1) // End of file
local_error = 0;
}
DBUG_RETURN(local_error);
}
/*
Send ok to the client
return: 0 sucess
1 error
*/
bool multi_delete::send_eof()
{
THD::killed_state killed_status= THD::NOT_KILLED;
thd_proc_info(thd, "deleting from reference tables");
/* Does deletes for the last n - 1 tables, returns 0 if ok */
int local_error= do_deletes(); // returns 0 if success
/* compute a total error to know if something failed */
local_error= local_error || error;
killed_status= (local_error == 0)? THD::NOT_KILLED : thd->killed;
/* reset used flags */
thd_proc_info(thd, "end");
/*
We must invalidate the query cache before binlog writing and
ha_autocommit_...
*/
if (deleted)
{
query_cache_invalidate3(thd, delete_tables, 1);
}
if ((local_error == 0) || thd->transaction.stmt.modified_non_trans_table)
{
if (mysql_bin_log.is_open())
{
if (local_error == 0)
thd->clear_error();
Query_log_event qinfo(thd, thd->query, thd->query_length,
transactional_tables, FALSE, killed_status);
if (mysql_bin_log.write(&qinfo) && !normal_tables)
local_error=1; // Log write failed: roll back the SQL statement
}
if (thd->transaction.stmt.modified_non_trans_table)
thd->transaction.all.modified_non_trans_table= TRUE;
}
if (local_error != 0)
error_handled= TRUE; // to force early leave from ::send_error()
/* Commit or rollback the current SQL statement */
if (transactional_tables)
if (ha_autocommit_or_rollback(thd,local_error > 0))
local_error=1;
if (!local_error)
{
thd->row_count_func= deleted;
::send_ok(thd, deleted);
}
return 0;
}
/***************************************************************************
TRUNCATE TABLE
****************************************************************************/
/*
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
dont_send_ok should be set if:
- We should always wants to generate the table (even if the table type
normally can't safely do this.
- We don't want an ok to be sent to the end user.
- We don't want to log the truncate command
- If we want to have a name lock on the table on exit without errors.
*/
bool mysql_truncate(THD *thd, TABLE_LIST *table_list, bool dont_send_ok)
{
HA_CREATE_INFO create_info;
char path[FN_REFLEN];
TABLE **table_ptr;
bool error;
DBUG_ENTER("mysql_truncate");
bzero((char*) &create_info,sizeof(create_info));
/* If it is a temporary table, close and regenerate it */
if (!dont_send_ok && (table_ptr=find_temporary_table(thd,table_list->db,
table_list->table_name)))
{
TABLE *table= *table_ptr;
table->file->info(HA_STATUS_AUTO | HA_STATUS_NO_LOCK);
db_type table_type= table->s->db_type;
if (!ha_check_storage_engine_flag(table_type, HTON_CAN_RECREATE))
goto trunc_by_del;
strmov(path, table->s->path);
*table_ptr= table->next; // Unlink table from list
close_temporary(table,0);
if (thd->slave_thread)
--slave_open_temp_tables;
*fn_ext(path)=0; // Remove the .frm extension
ha_create_table(path, &create_info,1);
// We don't need to call invalidate() because this table is not in cache
if ((error= (int) !(open_temporary_table(thd, path, table_list->db,
table_list->table_name, 1))))
(void) rm_temporary_table(table_type, path);
/*
If we return here we will not have logged the truncation to the bin log
and we will not send_ok() to the client.
*/
goto end;
}
(void) sprintf(path,"%s/%s/%s%s",mysql_data_home,table_list->db,
table_list->table_name,reg_ext);
fn_format(path, path, "", "", MY_UNPACK_FILENAME);
if (!dont_send_ok)
{
db_type table_type;
mysql_frm_type(thd, path, &table_type);
if (table_type == DB_TYPE_UNKNOWN)
{
my_error(ER_NO_SUCH_TABLE, MYF(0),
table_list->db, table_list->table_name);
DBUG_RETURN(TRUE);
}
if (!ha_check_storage_engine_flag(table_type, HTON_CAN_RECREATE))
goto trunc_by_del;
if (lock_and_wait_for_table_name(thd, table_list))
DBUG_RETURN(TRUE);
}
*fn_ext(path)=0; // Remove the .frm extension
error= ha_create_table(path,&create_info,1);
query_cache_invalidate3(thd, table_list, 0);
end:
if (!dont_send_ok)
{
if (!error)
{
if (mysql_bin_log.is_open())
{
thd->clear_error();
Query_log_event qinfo(thd, thd->query, thd->query_length,
0, FALSE, THD::NOT_KILLED);
mysql_bin_log.write(&qinfo);
}
send_ok(thd); // This should return record count
}
VOID(pthread_mutex_lock(&LOCK_open));
unlock_table_name(thd, table_list);
VOID(pthread_mutex_unlock(&LOCK_open));
}
else if (error)
{
VOID(pthread_mutex_lock(&LOCK_open));
unlock_table_name(thd, table_list);
VOID(pthread_mutex_unlock(&LOCK_open));
}
DBUG_RETURN(error);
trunc_by_del:
/* Probably InnoDB table */
ulonglong save_options= thd->options;
table_list->lock_type= TL_WRITE;
thd->options&= ~(OPTION_BEGIN | OPTION_NOT_AUTOCOMMIT);
ha_enable_transaction(thd, FALSE);
mysql_init_select(thd->lex);
error= mysql_delete(thd, table_list, (COND*) 0, (SQL_LIST*) 0,
HA_POS_ERROR, LL(0), TRUE);
ha_enable_transaction(thd, TRUE);
thd->options= save_options;
DBUG_RETURN(error);
}
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