How to know if rows are deleted using mysqli dbdriver

[eluser]bleu[/eluser]
I am using codeigniter 2.1.0 with mysqli dbdriver.
I have the below query and would like to know when it is successfull

Code:

$query = $this->db->query("delete FROM abc WHERE id IN (" . $IdList . ")");

How can I know if the related rows are deleted?