急!求助CI高手

function get_level_2($category){ $sql = "select * from category where category=$category order by Id desc"; $query = $this->db->query($sql); $rows = array(); foreach ($query->result_array() as $row){ $rows[] = $row; } return $rows; }报错:Fatal error: Call to a member function result_array() on a non-object in D:\xxxxx\system\application\models\category_model.php on line 77,category_model.php的77行就是上面的那段代码

再不行用PHP底层函数$cate_id=(int)$this->cate_id();$sql="select * from category where cate_id=$cate_id";$res=mysql_query($sql);while($row=mysql_fetch_array($res)){ $rows[]=$row;}

CREATE TABLE `category` ( `Id` int(11) NOT NULL auto_increment, `name` varchar(50) default NULL, `category` int(11) default NULL COMMENT '表示一级栏目，出境游或国内游或周边游等等', `intro` text, `px` int(11) default NULL COMMENT '排序', `gd` tinyint(1) default NULL, `addtime` date default NULL, PRIMARY KEY (`Id`)) ENGINE=MyISAM AUTO_INCREMENT=31 DEFAULT CHARSET=utf8;

在控制器里加载了class category extends controller { function __construct(){ parent::controller(); require_once('include.inc/application.php'); //载入模型 $this->load->model('category_model'); $this->load->model('content_model'); }