/**
  *
  * @param Item $item
  * @return type
  * @throws DaoException 
  */
 public function updateItem(Item $item)
 {
     try {
         $query = Doctrine_Query::create()->update('Item i');
         $query->set('i.name', '?', $item->getName());
         $query->set('i.sales_unit_price', '?', $item->getSalesUnitPrice());
         $query->set('i.purchase_unit_price', '?', $item->getPurchaseUnitPrice());
         $query->set('i.description', '?', $item->getDescription());
         $query->set('i.stock_available', '?', $item->getStockAvailable());
         $query->where('i.id = ?', $item->getId());
         return $query->execute();
     } catch (Exception $e) {
         throw new DaoException($e->getMessage(), $e->getCode(), $e);
     }
 }