Question

Iam尝试创建一个在删除后工作的触发器...

我有两张桌子..

**despatchitems**
id|solditems_id|quantity

...另

**solditems**
id|despatched|quantity

以下是我写的触发器

  CREATE TRIGGER `del_despatch_solditems` AFTER DELETE ON `despatchitems`
   FOR EACH ROW BEGIN
    Declare sum int;
    SELECT SUM(`quantity`) INTO sum FROM despatchitems WHERE solditems_id=old.solditems_id;
    UPDATE solditems SET despatched=sum WHERE id=old.solditems_id;
   END

这个触发器应该做的是更新＆＃34; solditems＆＃34;表格一旦删除了＆＃34; despatchitems＆＃34;表。如果是UPDATE OR INSERT，则相同的触发器正在工作......下面是代码

CREATE TRIGGER `ins_despatched_solditems` AFTER INSERT ON `despatchitems`
 FOR EACH ROW BEGIN
  Declare sum int;
  SELECT SUM(`quantity`) INTO sum FROM despatchitems WHERE solditems_id=NEW.solditems_id;
  UPDATE solditems SET despatched=sum WHERE id= NEW.solditems_id;
END
CREATE TRIGGER `upd_despatched_solditems` AFTER UPDATE ON `despatchitems`
 FOR EACH ROW BEGIN
  Declare sum int;
  SELECT SUM(`quantity`) INTO sum FROM despatchitems WHERE solditems_id=NEW.solditems_id;
  UPDATE solditems SET despatched=sum WHERE id= NEW.solditems_id;
END

由于原因我无法弄清楚AFTER DELETE触发器无效。有人可以帮帮我吗？

删除后没有更新的MYSQL TRIGGER

0 个答案: