/**
* Retrieves the ID generated for an AUTO_INCREMENT column by the previous INSERT query.
* @param string optional sequence name
* @return int
* @throws Exception
*/
public function getInsertId($sequence = NULL)
{
$this->connected || $this->connect();
$id = $this->driver->getInsertId($sequence);
if ($id < 1) {
throw new Exception('Cannot retrieve last generated ID.');
}
return (int) $id;
}
