database/mariadb
1
0
Fork 0
mirror of https://github.com/MariaDB/server.git synced 2025-07-30 16:24:05 +03:00
Code Activity

A fix for Bug#34643: TRUNCATE crash if trigger and foreign key.

Browse Source 
In cases when TRUNCATE was executed by invoking mysql_delete() rather
than by table recreation (for example, when TRUNCATE was issued on
InnoDB table with is referenced by foreign key) triggers were invoked.
In debug builds this also led to crash because of an assertion, which
assumes that some preliminary actions take place before trigger 
invocation, which doesn't happen in case of TRUNCATE.

The fix is not to execute triggers in mysql_delete() when this
function is used by TRUNCATE.
This commit is contained in:
anozdrin/alik@quad.
2008-03-12 16:13:33 +03:00
parent 93a0992854
commit 2b09a99340
3 changed files with 61 additions and 5 deletions
Download Patch File Download Diff File Expand all files Collapse all files

15
sql/sql_delete.cc
View File

@ -35,6 +35,7 @@ bool mysql_delete(THD *thd, TABLE_LIST *table_list, COND *conds,
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;
@ -93,6 +94,11 @@ bool mysql_delete(THD *thd, TABLE_LIST *table_list, COND *conds,
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
@ -102,8 +108,7 @@ bool mysql_delete(THD *thd, TABLE_LIST *table_list, COND *conds,
*/
if (!using_limit && const_cond && (!conds || conds->val_int()) &&
!(specialflag & (SPECIAL_NO_NEW_FUNC | SPECIAL_SAFE_MODE)) &&
(thd->lex->sql_command == SQLCOM_TRUNCATE ||
!(table->triggers && table->triggers->has_delete_triggers()))
!(triggers_applicable && table->triggers->has_delete_triggers())
)
{
deleted= table->file->records;
@ -217,7 +222,7 @@ bool mysql_delete(THD *thd, TABLE_LIST *table_list, COND *conds,
init_ftfuncs(thd, select_lex, 1);
thd->proc_info="updating";
if (table->triggers)
if (triggers_applicable)
{
table->triggers->mark_fields_used(thd, TRG_EVENT_DELETE);
if (table->triggers->has_triggers(TRG_EVENT_DELETE,
@ -239,7 +244,7 @@ bool mysql_delete(THD *thd, TABLE_LIST *table_list, COND *conds,
if (!(select && select->skip_record())&& !thd->net.report_error )
{
if (table->triggers &&
if (triggers_applicable &&
table->triggers->process_triggers(thd, TRG_EVENT_DELETE,
TRG_ACTION_BEFORE, FALSE))
{
@ -250,7 +255,7 @@ bool mysql_delete(THD *thd, TABLE_LIST *table_list, COND *conds,
if (!(error=table->file->delete_row(table->record[0])))
{
deleted++;
if (table->triggers &&
if (triggers_applicable &&
table->triggers->process_triggers(thd, TRG_EVENT_DELETE,
TRG_ACTION_AFTER, FALSE))
{