使用更新触发器来更新另一个表 [英] Using an update trigger to update another table

问题描述

我正在研究的程序的后端设计不佳，基本上需要两个不同的表来保存完全相同的信息.我正在尝试编写一个触发器，该触发器将使用与表A中刚刚更新的信息相同的信息来更新表B. 我不确定是否只是语法错误或缺少概念，将不胜感激……这是我到目前为止的一切

The program I am working on has a poorly designed backend and basically there are two different tables needed to hold the exact same information. I am trying to write a trigger that will update table B with the same information that was just updated in table A. Oh and this is using a MYSQL database I am not sure if I am just having a syntax error or if I am missing concepts, any help would be much appreciated... here is what I have as of yet

DELIMITER $$         
DROP TRIGGER IF EXISTS after_update_A;

CREATE TRIGGER `after_update_A` 

    AFTER UPDATE ON `A`  FOR EACH ROW
    BEGIN
        UPDATE TABLE B
        SET  username = NEW.username
           , password = NEW.password
           , email = NEW.email
        WHERE id = NEW.id
    END

    $$
DELIMITER ;

我得到的错误都与此类似... 错误1064(42000):您的SQL语法有错误；检查与您的MySQL服务器版本相对应的手册以获取正确的语法以在'= users.username附近使用 ，B.email = users.email D'在第4行

And the errors I get are all some what similar to this... ERROR 1064 (42000): You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '= users.username , B.email = users.email D' at line 4

推荐答案

您需要使用;关闭触发器中的每个语句，我的意思是每个.

You need to close every statement inside the trigger with a ;, and I do mean every.

CREATE TRIGGER `after_update_A` AFTER UPDATE ON `A` FOR EACH ROW
BEGIN
    UPDATE TABLE B
    SET  username = NEW.username
       , password = NEW.password
       , email = NEW.email
    WHERE id = NEW.id;    //<<-----------
END $$

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