public function render(Varien_Object $row)
 {
     $columnName = $this->getColumn()->getName();
     $columnName = explode('_', $columnName);
     if ($columnName[1]) {
         $resource = Mage::getSingleton('core/resource');
         $readConnection = $resource->getConnection('core_read');
         $installer = Mage::getModel('core/resource');
         $warehouseId = $columnName[1];
         $purchase_order_id = $this->getRequest()->getParam('id');
         $sql = 'SELECT qty_delivery from ' . $installer->getTableName("erp_inventory_delivery_warehouse") . ' WHERE (purchase_order_id = ' . $purchase_order_id . ') AND (product_id = ' . $row->getProductId() . ') AND (warehouse_id = ' . $warehouseId . ') AND (sametime = ' . $row->getSametime() . ')';
         $results = $readConnection->fetchAll($sql);
         $haveDelivery = 0;
         foreach ($results as $result) {
             if ($result['qty_delivery']) {
                 $haveDelivery = 1;
                 echo $result['qty_delivery'];
             }
         }
         if ($haveDelivery == '0') {
             echo 0;
         }
     } else {
         parent::render($row);
     }
 }