触发错误

Question

有人可以告诉我这个触发器有什么问题吗？我花了1个小时试图解决它，但遗憾的是没有成功，谢谢。

DELIMITER $$
CREATE TRIGGER  `pt_hotels_zero_check`BEFORE INSERT ON pt_hotels
FOR EACH ROW
BEGIN
IF(pt_hotels.touroperator_of = 0) THEN
    SIGNAL '45000'
    SET MESSAGE_TEXT = '0 value not allowed';
END IF; 
END$$
DELIMITER ;

我收到此错误：

#1064 - You have an error in your SQL syntax; check the manual that    corresponds to your MariaDB server version for the right syntax to use near ''45000'
    SET MESSAGE_TEXT = '0 value not allowed';
END IF; 

END'在第5行

Answer 1

SIGNAL语句的正确语法是：

SIGNAL SQLSTATE '45000'
  SET MESSAGE_TEXT = '0 value not allowed';

请参阅以下文档： https://dev.mysql.com/doc/refman/5.5/en/signal.html