public function actionDelete()
 {
     $banner_id = $_POST['banner_id'];
     $model = new Backend_banner();
     $rs = $model->get_banner_by_id($banner_id);
     $images = $rs['banner_images'];
     if (isset($images)) {
         $filename = './uploads/banner/' . $images;
         if (file_exists($filename)) {
             unlink($filename);
         }
     }
     Yii::app()->db->createCommand()->delete('banner', "banner_id = '{$banner_id}' ");
 }
 public function actionIndex()
 {
     $banner = new Backend_banner();
     $data['banner'] = $banner->get_banner();
     $this->render('//backend/banner/index', $data);
 }