php 新手问题

model

    class Stock_model extends CI_Model{

        private $hsh;
        function __construct()
        {
            parent::__construct();
            $_ci = & get_instance();


            //$this->hsh = $_ci->load->database('hsh',TRUE);
            $hsh = $_ci->load->database('hsh',TRUE);
        }



        function  get_stock($goods_huo)
        {
            if(isset($goods_huo))
            {
                $hsh->where('item_huo',$goods_huo);
                $query =  $hsh->get('item_info');

                return $query->result_array();
                $query->free_result();

            }
        }
    }

报错

<h4>A PHP Error was encountered</h4>
<p>Severity: Notice</p>
<p>Message:  Undefined variable: hsh</p>
<p>Filename: models/stock_model.php</p>
<p>Line Number: 22</p>
</div><br />
<b>Fatal error</b>:  Call to a member function where() on a non-object in <b>D:\htdocs\application\models\stock_model.php</b> on line <b>22</b><br />

刚学，很多问题不懂！这是用的CI

$hsh 换成 $this->hsh

//$this->hsh = $_ci->load->database('hsh',TRUE);
$hsh = $_ci->load->database('hsh',TRUE);

Message: Undefined variable: hsh
未定义变量hsh
你把$hsh都改为$this->hsh。
随便建议一下，应该把基础打好了再用框架，过早使用框架只会抑制你的成长。

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