contoh no 2

//controller
$username = $this->input->post("username", TRUE);
            $password = MD5($this->input->post('password', TRUE));
			//checking data via model
			$checking = $this->admin->check_login('tbl_users', array('username' => $username), array('password' => $password));


//model
 function check_login($table, $field1, $field2)
    {
        $this->db->select('*');
        $this->db->from($table);
        $this->db->where($field1);
        $this->db->where($field2);
        $this->db->limit(1);
        $query = $this->db->get();
        if ($query->num_rows() == 0) {
            return FALSE;
        } else {
            return $query->result();
        }
    }