php - Open cart not use $this->db->query in model file -


working in open cart model view controller structure know $db library file , store in page load , set key value in registry file. question in model file place open cart use.path of file catalog\model\order\order.php.

 $order_query = $this->db->query('select * `'.db_prefix."order`

but in same model file, in places open cart not use variable.

 $sql = '     select * '.db_prefix."order_sellerhistory


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