如何在Codeigniter的迁移库中创建触发器 [英] How to create triggers in Codeigniter's migration library

问题描述

触发器的创建无法正常工作，例如，我尝试了所有可以想到的事情:

Triggers creation are just not working, I tried everything I can think of, for instance, like that:

$this->db->query("DELIMITER //\r\n
CREATE TRIGGER `delete_post` BEFORE DELETE ON `posts`\r\n
FOR EACH ROW BEGIN\r\n
DELETE FROM page_content WHERE page_content.post_id = OLD.post_id;\r\n
END\r\n
//\r\n
DELIMITER ;");

无论我做什么，我都觉得它不会创建触发器，因为Codeigniter仅在一行中创建SQL语句.尝试使用和不使用换行符，仍然会收到此消息:

And whatever I do, I have the feeling it won't create the trigger because Codeigniter create the SQL statement in only one line. Tried with and without the line breaks, still get this message:

错误号:1064

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 'DELIMITER // CREATE TRIGGER `delete_post` BEFORE DELETE ON `posts` FOR EAC' at line 1

DELIMITER // CREATE TRIGGER `delete_post` BEFORE DELETE ON `posts` FOR EACH ROW BEGIN DELETE FROM page_content WHERE page_content.post_id = OLD.post_id; END // DELIMITER ;

在PHPMyAdmin中，触发器的创建可以顺便进行，因此SQL有效

In PHPMyAdmin, the trigger create works by the way, so the SQL is valid

推荐答案

通过PHP执行时，应从触发器中删除定界符. mysql_或mysqli_函数应该能够执行触发器，而无需 定界符.

You should remove the delimiter from the trigger while executing via PHP. mysql_ or mysqli_ functions should be able to execute the trigger without the delimiter.

这是方法.

$this->db->query("
CREATE TRIGGER `delete_post` BEFORE DELETE ON `posts`\r\n
FOR EACH ROW BEGIN\r\n
DELETE FROM page_content WHERE page_content.post_id = OLD.post_id;\r\n
END\r\n
//\r\n
");

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