Question

我有两个表A和B.如果删除表A中的条目，我想使用用户ID更新表B中条目的状态。我正在使用此代码：

CREATE TRIGGER blockuserundo BEFORE DELETE ON user_blocked
FOR EACH ROW BEGIN
UPDATE members SET ty_status = '1' WHERE user_id = OLD.block_user_id ;
END;

它显示如下错误：

触发器中没有新行删除

请指导我编写上述方案的查询。

Answer 1

您需要将分隔符设置为;

以外的其他分隔符

DELIMITER |
CREATE TRIGGER blockuserundo BEFORE DELETE ON user_blocked
FOR EACH ROW BEGIN
UPDATE members SET ty_status = '1' WHERE user_id = OLD.block_user_id ;
END;
|
DELIMITER ;

以下代码按预期工作：

DROP TABLE IF EXISTS user_blocked;
CREATE TABLE user_blocked 
(
    block_user_id INT
);
DROP TABLE IF EXISTS members;
CREATE TABLE members 
(
    user_id INT,
    ty_status CHAR(1)
);

INSERT user_blocked
VALUES (1),(2),(3),(4),(5);

INSERT members
VALUES (1, '0'),(2, '0'),(3, '0'),(8, '0'),(9, '1');

DELIMITER |
CREATE TRIGGER blockuserundo BEFORE DELETE ON user_blocked
FOR EACH ROW BEGIN
UPDATE members SET ty_status = '1' WHERE user_id = OLD.block_user_id ;
END;
|
DELIMITER ;

SELECT * FROM members;

DELETE FROM user_blocked WHERE block_user_id IN(1,2);
SELECT * FROM members;

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