[英]Updating after delete | mysql trigger
I have two tables for example table1 and table2. 我有两个表,例如table1和table2。 If something is deleted in table1 i want to update a column in table2.
如果在表1中删除了某些内容,我想更新表2中的列。 Is this even possible with a trigger in phpmyadmin?
在phpmyadmin中使用触发器甚至可能吗? if yes what do i have to add or which syntax i have to use for it to work?
如果是,我必须添加什么或必须使用哪种语法才能工作?
I tried this so far: 到目前为止,我已经尝试过了:
DELIMITER //
CREATE TRIGGER `update` AFTER DELETE ON table1
FOR EACH ROW BEGIN
-- this is the part i dont know what to do and i couldnt find any related to my task
END//
DELIMITER ;
Well, in your TRIGGER you can access the value you just deleted with OLD.your_column_name
. 好吧,在您的TRIGGER中,您可以使用
OLD.your_column_name
访问刚删除的值。
So just do : 所以做:
DELIMITER //
CREATE TRIGGER `update` AFTER DELETE ON table1
FOR EACH ROW BEGIN
UPDATE table2 SET column_name = your_new_value WHERE column_name = OLD.old_value;
END//
DELIMITER ;
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