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/*
This class holds all information about triggers of table.
QQ: Will it be merged into TABLE in future ?
*/
class Table_triggers_list: public Sql_alloc
{
/* Triggers as SPs grouped by event, action_time */
sp_head *bodies[3][2];
/*
Copy of TABLE::Field array with field pointers set to old version
of record, used for OLD values in trigger on UPDATE.
*/
Field **old_field;
/*
Names of triggers.
Should correspond to order of triggers on definitions_list,
used in CREATE/DROP TRIGGER for looking up trigger by name.
*/
List<LEX_STRING> names_list;
public:
/*
Field responsible for storing triggers definitions in file.
It have to be public because we are using it directly from parser.
*/
List<LEX_STRING> definitions_list;
Table_triggers_list():
old_field(0)
{
bzero((char *)bodies, sizeof(bodies));
}
~Table_triggers_list();
bool create_trigger(THD *thd, TABLE_LIST *table);
bool drop_trigger(THD *thd, TABLE_LIST *table);
bool process_triggers(THD *thd, trg_event_type event,
trg_action_time_type time_type)
{
int res= 0;
if (bodies[event][time_type])
{
/*
Similar to function invocation we don't need to surpress sending of
ok packets here because don't allow execute statements from trigger.
FIXME: We should juggle with security context here (because trigger
should be invoked with creator rights).
*/
res= bodies[event][time_type]->execute_function(thd, 0, 0, 0);
}
return res;
}
static bool check_n_load(THD *thd, const char *db, const char *table_name,
TABLE *table);
bool has_delete_triggers()
{
return (bodies[TRG_EVENT_DELETE][TRG_ACTION_BEFORE] ||
bodies[TRG_EVENT_DELETE][TRG_ACTION_AFTER]);
}
friend class Item_trigger_field;
private:
bool prepare_old_row_accessors(TABLE *table);
};
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