如何笨的遷移庫

Question

觸發創作只是不工作創建觸發器，我用盡了一切我能想到的，例如，像：

$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 ;"); 

而且無論我做什麼，我都將它獲得的感覺不會創建觸發器，因爲Codeigniter只在一行中創建SQL語句。與不換行試過，仍然得到這個消息：

錯誤編號：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，觸發創建的方式工作，所以SQL是有效

Answer 1

你應該在通過PHP執行時從觸發器中刪除分隔符。 mysql_或mysqli_函數應該能夠執行沒有 分隔符的觸發器。

以下是如何做到這一點。

$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 
");