/**
* Performs the given query.
*
* Performs the $query, checks for errors and throws an exception in case.
* Returns the generated statement object on success. If the $transaction
* parameter is set to true, the query is excuted transaction save.
*
* @param ezcQuery $q
* @param bool $transaction
* @return PDOStatement
*
* @access private
*/
public function performQuery(ezcQuery $q, $transaction = false)
{
if ($transaction) {
$this->database->beginTransaction();
}
try {
$stmt = $q->prepare();
$stmt->execute();
if (($errCode = $stmt->errorCode()) != 0) {
if ($transaction) {
$this->database->rollback();
}
throw new ezcPersistentQueryException("The query returned error code {$errCode}.", $q);
}
if ($transaction) {
$this->database->commit();
}
return $stmt;
} catch (PDOException $e) {
if ($transaction) {
$this->database->rollback();
}
throw new ezcPersistentQueryException($e->getMessage(), $q);
}
}
