Question

我想设置一个触发器：

TRIGGER `increment_topic_replies_on_insert`
BEFORE INSERT ON  `forum replies` FOR EACH ROW

INSERT INTO `users votes`
SET userid = NEW.userid
    replyid = NEW.replyid,
    forumtopicid = NEW.forumtopicid;

UPDATE `forum topics` ft
SET replies = replies +1
WHERE NEW.forumtopicid = ft.id;

因此，在users votes进入forum topics之后，它会更新{{1}}中的一行。我应该使用两个单独的触发器来实现这一目标吗？

我当前的触发器不断抛出错误＆＃34;您的SQL语法错误＆＃34;。

Answer 1

你的INSERT＆amp; UPDATE语句语法错误，试试这个

CREATE TRIGGER `increment_topic_replies_on_insert` BEFORE INSERT ON `forum replies`
  FOR EACH ROW
  BEGIN
    INSERT INTO `users votes` (userid,replyid,forumtopicid)
    VALUES (NEW.userid, NEW.replyid, NEW.forumtopicid);

    UPDATE `forum topics` ft
      SET ft.replies = replies + 1
    WHERE ft.id = NEW.forumtopicid;
  END;

MySQL Trigger：INSERT table1，UPDATE table2

1 个答案: