CodeIgniter activerecord, retrieve last insert id?
Shame on me...
I looked at the user guide and the first function is $this->db->insert_id();
This also works with activerecord inserts...
EDIT: I updated the link
Last insert id means you can get inserted auto increment id by using this method in active record,
$this->db->insert_id()
// it can be return insert id it is
// similar to the mysql_insert_id in core PHP
You can refer this link you can find some more stuff.
Information from executing a query