/**
* Throw a PDO Exception based on the last PDO error.
*/
protected function throwPDOException()
{
$error_info = $this->dbh->errorInfo();
// We rebuild a message formatted in the same way as PDO.
$exception = new \PDOException("SQLSTATE[" . $error_info[0] . "]: General error " . $error_info[1] . ": " . $error_info[2]);
$exception->errorInfo = $error_info;
throw $exception;
}