MySQL 触发器：插入表 1，更新表 2

Question

我想这样设置触发器：

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;

所以在它插入 users votes 之后，它会更新 forum topics 中的一行。我应该使用两个单独的触发器来实现吗？

我当前的触发器不断抛出错误 "You have an error in your SQL syntax"。

Answer 1

您的 INSERT & 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 触发器：插入表 1，更新表 2

MySQL Trigger: INSERT table1, UPDATE table2

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