Best way of retrieving primary key

[eluser]jeremydt[/eluser]
Thanks Alexandru.

This is what my login code currently looks like; I too am tired... perhaps I'll get around to integrating tomorrow.

login.php

Code:

function validate_credentials() {
        $this->load->model('model_membership');
        $q = $this->model_membership->validate();
        
        if($q) {
            $data = array(
                'username' => $this->input->post('username'),
                'is_logged_in' => true
            );
            
            $this->session->set_userdata($data);
            redirect('admin');
            
        }
        else {
            $this->index();
        }
    }

model_membership.php

Code:

function validate() {
        
        $this->db->where('user_username', $this->input->post('username'));
        $this->db->where('user_password', md5($this->input->post('password')));
        $q = $this->db->get('user');
        
        
        if($q->num_rows == 1) {
            return true;
        }
    }