How to throw mongoDB query, directly to mongoDB server?

[eluser]zacksyah[/eluser]
is there function to throw query mongoDB like this

Code:

$this->db->query($query)

because I want to create mongoDB executor in codeigniter so if I type this query like this

Code:

db.users.find({age:33})

codeigniter throw that query directly to mongodb server. or is there another way? please help, thanks in advance