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https://github.com/MariaDB/server.git
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5a6c7027f0
and some SP-related cleanups. - We don't have separate stage for calculation of list of tables to be prelocked and doing implicit LOCK/UNLOCK any more. Instead we calculate this list at open_tables() and do implicit LOCK in lock_tables() (and UNLOCK in close_thread_tables()). Also now we support cases when same table (with same alias) is used several times in the same query in SP. - Cleaned up execution of SP. Moved all common code which handles LEX and does preparations before statement execution or complex expression evaluation to auxilary sp_lex_keeper class. Now all statements in SP (and corresponding instructions) that evaluate expression which can contain subquery have their own LEX.
79 lines
2.0 KiB
C++
79 lines
2.0 KiB
C++
/*
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This class holds all information about triggers of table.
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QQ: Will it be merged into TABLE in future ?
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*/
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class Table_triggers_list: public Sql_alloc
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{
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/* Triggers as SPs grouped by event, action_time */
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sp_head *bodies[3][2];
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/*
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Copy of TABLE::Field array with field pointers set to old version
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of record, used for OLD values in trigger on UPDATE.
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*/
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Field **old_field;
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/*
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Names of triggers.
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Should correspond to order of triggers on definitions_list,
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used in CREATE/DROP TRIGGER for looking up trigger by name.
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*/
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List<LEX_STRING> names_list;
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public:
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/*
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Field responsible for storing triggers definitions in file.
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It have to be public because we are using it directly from parser.
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*/
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List<LEX_STRING> definitions_list;
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Table_triggers_list():
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old_field(0)
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{
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bzero((char *)bodies, sizeof(bodies));
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}
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~Table_triggers_list();
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bool create_trigger(THD *thd, TABLE_LIST *table);
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bool drop_trigger(THD *thd, TABLE_LIST *table);
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bool process_triggers(THD *thd, trg_event_type event,
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trg_action_time_type time_type)
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{
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int res= 0;
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if (bodies[event][time_type])
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{
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#ifndef EMBEDDED_LIBRARY
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/* Surpress OK packets in case if we will execute statements */
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my_bool nsok= thd->net.no_send_ok;
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thd->net.no_send_ok= TRUE;
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#endif
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/*
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FIXME: We should juggle with security context here (because trigger
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should be invoked with creator rights).
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*/
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res= bodies[event][time_type]->execute_function(thd, 0, 0, 0);
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#ifndef EMBEDDED_LIBRARY
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thd->net.no_send_ok= nsok;
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#endif
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}
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return res;
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}
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static bool check_n_load(THD *thd, const char *db, const char *table_name,
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TABLE *table);
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bool has_delete_triggers()
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{
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return (bodies[TRG_EVENT_DELETE][TRG_ACTION_BEFORE] ||
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bodies[TRG_EVENT_DELETE][TRG_ACTION_AFTER]);
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}
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friend class Item_trigger_field;
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private:
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bool prepare_old_row_accessors(TABLE *table);
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};
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