Question

我是论坛的新手，我有以下问题，我希望在删除租约表位置后，我会进入表格电影并让列情况变得可用，但如果我有代码在另一个寄存器中表格位置的电影，我仍然把表格的列状态留作租借，我该怎么做？

这就是我所做的

TRIGGER `tguDelete` AFTER DELETE ON `locations` FOR EACH ROW UPDATE movies SET situation = 'available' WHERE code_location = OLD.code_location

我想发布表格的图片，但我是论坛的新手请帮帮我！

我使用phpmyadmin，我是mysql的新手

Answer 1

我认为您的触发器定义需要一些工作。例如 - 您要声明“trigger function”应该在AFTER表上执行DELETE locations次操作。这就是你如何做到的：

DROP TRIGGER IF EXISTS `tguDelete`;
DELIMITER $$
CREATE TRIGGER `tguDelete` AFTER DELETE ON `locations` 
FOR EACH ROW 
-- condition for rows for which the trigger would fire WHEN (OLD.code_location <> 0)
-- DECLARE
   -- if you had things you wanted to declare
BEGIN
   -- here you do the updating of the movies table:
   UPDATE movies SET situation = 'available' WHERE code_location = OLD.code_location;
END;$$
DELIMITER ;

如果您不需要DELIMITERS（即：PHPMyAdmin），请跳过它们，例如

DROP TRIGGER IF EXISTS `tguDelete`;
CREATE TRIGGER `tguDelete` AFTER DELETE ON `locations` 
FOR EACH ROW 
-- condition for rows for which the trigger would fire WHEN (OLD.code_location <> 0)
-- DECLARE
   -- if you had things you wanted to declare
BEGIN
   -- here you do the updating of the movies table:
   UPDATE movies SET situation = 'available' WHERE code_location = OLD.code_location;
END;

我怎么能这样做触发删除验证

1 个答案: