public function updateStockchangeHistory($productprice, $oldstock)
 {
     $date = date($this->datetimemysqlformatYMDHIS);
     $prdid = $productprice->product_id;
     $prdprcid = $productprice->id;
     $newstock = $productprice->stock;
     $history = new Productstockhistory;
     $history->product_id = $prdid;
     $history->productprice_id = $prdprcid;
     $history->updationdate = $date;
     $history->beforeupdation = $oldstock;
     $history->afterupdation = $newstock;
     $history->updatedqnty = $newstock - $oldstock;
     return $history->save();
 }
 /**
  * Returns the data model based on the primary key given in the GET variable.
  * If the data model is not found, an HTTP exception will be raised.
  * @param integer the ID of the model to be loaded
  */
 public function loadModel( $id )
 {
     $model = Productstockhistory::model()->findByPk( $id );
     if ( $model === null )
         throw new CHttpException( 404, 'The requested page does not exist.' );
     return $model;
 }