以下行提供错误消息。mySQL加入问题
$query = 'SELECT * FROM products AS p LEFT JOIN categories AS c USING ON c.id = p.category_id WHERE c.name = "Galleri1"
AND p.status = "active"' ;
$Q = $this->db->query($query);
数据库结构。 类别
CREATE TABLE IF NOT EXISTS `categories` (
`id` int(11) NOT NULL AUTO_INCREMENT,
`name` varchar(255) NOT NULL,
`shortdesc` varchar(255) NOT NULL,
`longdesc` text NOT NULL,
`status` enum('active','inactive') NOT NULL,
`parentid` int(11) NOT NULL,
PRIMARY KEY (`id`)
) ENGINE=MyISAM DEFAULT CHARSET=latin1 AUTO_INCREMENT=15 ;
...
...
PRODUCT
CREATE TABLE IF NOT EXISTS `products` (
`id` int(11) NOT NULL AUTO_INCREMENT,
`name` varchar(255) NOT NULL,
`shortdesc` varchar(255) NOT NULL,
`longdesc` text NOT NULL,
`thumbnail` varchar(255) NOT NULL,
`image` varchar(255) NOT NULL,
`class` varchar(255) DEFAULT NULL,
`grouping` varchar(16) DEFAULT NULL,
`status` enum('active','inactive') NOT NULL,
`category_id` int(11) NOT NULL,
`featured` enum('true','false') NOT NULL,
`price` float(4,2) NOT NULL,
PRIMARY KEY (`id`)
) ENGINE=MyISAM DEFAULT CHARSET=latin1 AUTO_INCREMENT=20 ;
错误消息
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 'ON c.id = p.category_id WHERE c.name = "Galleri1" AND p.status = "active"' at line 1
SELECT * FROM products AS p LEFT JOIN categories AS c USING ON c.id = p.category_id WHERE c.name = "Galleri1" AND p.status = "active"
Q1。任何人都可以指出我的错误吗? Q2302。任何人都可以告诉我如何在Codeigniter的Active Record类中编写此代码?
在此先感谢。
感谢。它解决了这个问题。但我得到了另一个。在此查询之后,如果($ Q-> num_rows()> 0)foreach($ Q-> result_array()为$ row){ $ data = array( \t“id”=> $ row [' ID '], \t \t “名”=> $行[' 名称 '], \t “shortdesc”=> $行[' shortdesc'], \t \t ... \t \t “类别”=> $行['categories.name'] 我得到最后一个错误。如何分配类别的名称? – shin
'@ shin':你最好把它作为另一个问题发布。 – Quassnoi
好吧。我在这里发布。 http:///stackoverflow.com/questions/1828406/如何对获取数据从 - 一个连表 – shin