/** * Returns true if the tax is used in an order details * * @return bool */ public function isUsed() { $db = JFactory::betDBo(); $query = "SELECT " . $db->quoteName('tax_id') . " FROM " . $db->quoteName('#__jeproshop_order_detail_tax') . " WHERE " . $db->quoteName('tax_id') . " = " . (int) $this->tax_id; $db->setQuery($query); return $db->loadResult(); }