thinkphp视图模型查询失败提示：ERR: 1146:Table ‘db.pr_order_view’ doesn’t exist

class OrderViewModel extends ViewModel
{
public $viewFields = array(
'Order' =>array(
'_as'=>'Orders', //重新命名，以免与系统语法冲突
'id'=>'oid',
'ordid',
'user',
'product',
'status',
'paynum',
'cat',
'payment_trade_no',
'ip'=>'mip',
'reserve_time',
'createtime',
'payment_trade_status',
),
'Member'=>array(
'id'=>'mid',
'name'=>'uname',
'cardnum',
'tel',
'reg_time',
'reg_ip',
'qq',
'email',
'address',
'last_login_time',
'last_login_ip',
'_on'=>'Orders.user=Member.id'
),
'Product'=>array(
'id',
'shorttitle',
'img1',
'category',
'_on'=>'Orders.product=Product.id'
),
);

}
?>