Showing All Result DB In Code Igniter 2

/* siswa.php didalam direktori controllers */

<?php
    Class Siswa extends Controller {
        function __construct() {
            parent::Controller();

            $this->load->database();
        }

        function index() {
            $this->load->model('Db_model','',TRUE);
            $data["data_siswa"] = $this->Db_model->ambil_data();
            $this->load->view('siswa',$data);
        }
    }
?>