Как из базы вытянуть последний заказ? - Joomla 3.x: Общие вопросы

defined('_JEXEC') or die('Restricted access');
jimport('joomla.plugin.plugin');

$db = JFactory::getDBO();
$q = 'SELECT `order_number` FROM #__virtuemart_orders ORDER BY `order_number` DESC LIMIT 1';
$db->setQuery($q);
$order_num = $db->loadResult();
echo $order_num;

$db = JFactory::getDBO();
		$q = 'SELECT `order_number` FROM #__virtuemart_orders ORDER BY `virtuemart_order_id` DESC LIMIT 1';
		$db->setQuery($q);
		$order_num = $db->loadResult();
		echo $order_num;