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Save and clear run context before executing a stored function or trigger and restore it afterwards.

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This allows us to use statement replication with functions and triggers
The following things are fixed with this patch:
- NOW() and automatic timestamps takes the value from the main event for functions and triggers (which allows these to replicate with statement level logging)
- No side effects for triggers or functions with auto-increment values(), last_insert_id(), rand() or found_rows()
- Triggers can't return result sets

Fixes bugs:
#12480: NOW() is not constant in a trigger
#12481: Using NOW() in a stored function breaks statement based replication
#12482: Triggers has side effects with auto_increment values
#11587: trigger causes lost connection error
This commit is contained in:
monty@mysql.com
2005-08-15 18:15:12 +03:00
parent 4963388cc1
commit df32f7d621
15 changed files with 505 additions and 111 deletions
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51
sql/sql_trigger.h
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@ -20,6 +20,7 @@
QQ: Will it be merged into TABLE in future ?
*/
class Table_triggers_list: public Sql_alloc
{
/* Triggers as SPs grouped by event, action_time */
@ -76,55 +77,7 @@ public:
bool drop_trigger(THD *thd, TABLE_LIST *table);
bool process_triggers(THD *thd, trg_event_type event,
trg_action_time_type time_type,
bool old_row_is_record1)
{
int res= 0;
if (bodies[event][time_type])
{
bool save_in_sub_stmt= thd->in_sub_stmt;
#ifndef EMBEDDED_LIBRARY
/* Surpress OK packets in case if we will execute statements */
my_bool nsok= thd->net.no_send_ok;
thd->net.no_send_ok= TRUE;
#endif
if (old_row_is_record1)
{
old_field= record1_field;
new_field= table->field;
}
else
{
new_field= record1_field;
old_field= table->field;
}
/*
FIXME: We should juggle with security context here (because trigger
should be invoked with creator rights).
*/
/*
We disable binlogging, as in SP/functions, even though currently
triggers can't do updates. When triggers can do updates, someone
should add such a trigger to rpl_sp.test to verify that the update
does NOT go into binlog.
*/
tmp_disable_binlog(thd);
thd->in_sub_stmt= TRUE;
res= bodies[event][time_type]->execute_function(thd, 0, 0, 0);
thd->in_sub_stmt= save_in_sub_stmt;
reenable_binlog(thd);
#ifndef EMBEDDED_LIBRARY
thd->net.no_send_ok= nsok;
#endif
}
return res;
}
bool old_row_is_record1);
bool get_trigger_info(THD *thd, trg_event_type event,
trg_action_time_type time_type,
LEX_STRING *trigger_name, LEX_STRING *trigger_stmt,