如何解决插入前创建mysql触发器语法错误
嗨,我正在创建一些触发器以在插入查询之前更新插入查询中的值
CREATE TRIGGER `Insert members in Posts` BEFORE INSERT ON
`posts` FOR EACH ROW
BEGIN
DECLARE name_ varchar(100);
DECLARE contact_ varchar(16);
DECLARE status_ int;
DECLARE deleted_ int;
SELECT
`members`.`name`,`members`.`contact`,`members`.`status`,`members`.`deleted`
INTO name_,contact_,status_,deleted_
FROM
`members`
WHERE
`members`.`member_id` = NEW.member_id;
SET NEW.member_name = name_;
SET NEW.member_contact = contact_;
SET NEW.member_status = status_;
SET NEW.member_deleted = deleted;
END
但是我收到了类似的错误
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 '' at line 4
我对第4行有什么错误感到困惑,请向别人解释。谢谢。
解决方法
例如,根据所使用的客户端/终端,您可能需要设置定界符
drop trigger if exists t;
delimiter $$
CREATE TRIGGER t BEFORE INSERT ON
`posts` FOR EACH ROW
BEGIN
DECLARE name_ varchar(100);
DECLARE contact_ varchar(16);
DECLARE status_ int;
DECLARE deleted_ int;
SELECT
`members`.`name`,`members`.`contact`,`members`.`status`,`members`.`deleted`
INTO name_,contact_,status_,deleted_
FROM
`members`
WHERE
`members`.`member_id` = NEW.member_id;
SET NEW.member_name = name_;
SET NEW.member_contact = contact_;
SET NEW.member_status = status_;
SET NEW.member_deleted = deleted;
END $$
delimiter ;
请查看https://dev.mysql.com/doc/refman/8.0/en/stored-routines.html
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