SAP HANA中的触发器(Trigger)

HANA 创建Triggers语法：

CREATE TRIGGER <trigger_name> <trigger_action_time> <trigger_event> ON <subject_table_name> [REFERENCING <transition_list>] [<for_each_row>] BEGIN [<trigger_decl_list>] [<proc_handler_list>] <trigger_stmt_list> END

例子：

 CREATE TABLE TARGET ( A INT);

 CREATE TABLE SAMPLE ( A INT);

 CREATE TRIGGER TEST_TRIGGER_WHILE_UPDATE

 AFTER UPDATE ON TARGET

 BEGIN

     DECLARE found INT := 1;

     DECLARE val INT := 1;

     WHILE :found <> 0 DO

         SELECT count(*) INTO found FROM sample WHERE a = :val;

         IF :found = 0 THEN

             INSERT INTO sample VALUES(:val);

         END IF;

         val := :val + 1;

     END WHILE;

 END;

 

触发器