mysql - 我的触发器在 MySQL 中不起作用

Question

我想在 MySQL 中创建触发器，但是当我运行创建代码时它显示错误消息:

CREATE TRIGGER before_employee_update 
    BEFORE UPDATE ON trigger
    FOR EACH ROW BEGIN

    update users
    SET username= 'krishna',
        password= 'abc';
END

错误是:

1064 - 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 'trigger FOR EACH ROW BEGIN INSERT INTO users SET username= 'kr' at line 2

这是错误指向的代码:

BEFORE UPDATE ON trigger
                 ^^^^^^^

Answer 1

TRIGGER是MySQL中的保留字，你应该引用这个名字 -

CREATE TRIGGER before_employee_update
  BEFORE UPDATE
  ON `trigger`
  FOR EACH ROW
BEGIN
  UPDATE users SET username = 'krishna', password = 'abc';
END

作为解决方法 - 重命名表触发器。