Get something or something and other from mysql

[eluser]pisio[/eluser]
How I can fix it.
In user_passrecover I have form for submitting information for $step == 'nexstep'/
How I can run correctly mysql query ?

Code:

function forgotpassword()
    {

        $step =  $this->uri->segment(3);
       if($step == NULL)
       {
         $step = 1;
       }
       if($step == 'nextstep')
       {
             $this->db->get('user');
             $this->db->where(array('name'=>$_POST['name']));
             $this->db->or_where(array('name'=>$_POST['name'],'mail'=>$_POST['mail']));
             $this->db->query();

          $step = 2;

       }

       $this->load->view('user_passrecovery',array('step' => $step));
    }


}