protected function getOrderQuery( $orders = array() )
	{
		if( is_array( $orders ) && count( $orders ) )
		{
			$order = array();
			foreach( $orders as $key => $value )
				$order[] = $key.' '.$value;
			$orders = ' ORDER BY '.implode( ', ', $order );
		}
		else
			$orders = '';
		return $orders;
	}