229 try {
230 if ($params !== null) {
231 return $this->_stmt->execute($params);
232 } else {
233 return $this->_stmt->execute();
234 }
235 } catch (PDOException $e) {
236 require_once 'Zend/Db/Statement/Exception.php';
237 throw new Zend_Db_Statement_Exception($e->getMessage());
238 }
239 }