how to create MVC for search in Codeigniter?

# The Controller
class Search extends CI_Controller {

    public function __construct()
    {
        parent::__construct();

        $this->load->helper('form');

        $this->load->model('search_model');
    }

    public function index()
    {
        $this->load->view('search_form');
    }

    public function execute_search()
    {
        // Retrieve the posted search term.
        $search_term = $this->input->post('search');

        // Use a model to retrieve the results.
        $data['results'] = $this->search_model->get_results($search_term);

        // Pass the results to the view.
        $this->load->view('search_results',$data);
    }

}

# The Model
class Search_model extends CI_Model {

    public function get_results($search_term='default')
    {
        // Use the Active Record class for safer queries.
        $this->db->select('*');
        $this->db->from('members');
        $this->db->like('username',$search_term);

        // Execute the query.
        $query = $this->db->get();

        // Return the results.
        return $query->result_array();
    }

}

# The view for displaying the search form
<?php
    echo form_open('search/execute_search');

    echo form_input(array('name'=>'search'));

    echo form_submit('search_submit','Submit');


?>

# The View for displaying results
<div>
    <?php
        // List up all results.
        foreach ($results as $val)
        {
            echo $val['username'];
        }
    ?>
</div>