Question

第一张表 - rm_desc
第二个表 - room_cat_mapping

想要实现：在自动删除rm_desc中的记录时，它也应该从room_cat_mapping中删除相关记录。

但是下面的触发器没有工作，任何新的触发器

DROP TRIGGER IF EXISTS DELETE_ROOM_TYPES;
DELIMITER $$

CREATE
    /*[DEFINER = { user | CURRENT_USER }]*/
    TRIGGER `DELETE_ROOM_TYPES` BEFORE DELETE
    ON `rm_desc`
    FOR EACH ROW 
    BEGIN
        DELETE FROM room_cat_mapping
        WHERE room_cat_mapping.prop_id = rm_desc.res AND room_cat_mapping.room_cat_id = rm_desc.rm_cat;
    END$$
DELIMITER ;

Answer 1

这应该做：

DROP TRIGGER IF EXISTS DELETE_ROOM_TYPES;
DELIMITER $$

CREATE

    TRIGGER `DELETE_ROOM_TYPES` AFTER DELETE
    ON `rm_desc`
    FOR EACH ROW 
    BEGIN
        DELETE FROM room_cat_mapping
        WHERE room_cat_mapping.prop_id = OLD.res AND room_cat_mapping.room_cat_id = OLD.rm_cat;
    END$$
DELIMITER ;

我将触发器更改为 AFTER ，并使用 OLD 引用已删除的行值。

DELETE触发器不工作 - MYSQL

1 个答案: