Controller CI

<?php
defined('BASEPATH') OR exit('No direct script access allowed');

class Main extends CI_Controller {

        public function __construct()
        {
                parent::__construct();
                $this->load->model("Mymodel");

        }


    public function index()
    {

                $data = $this->Mymodel->GetSiswa('siswa');
                $this->load->view("main/index", array('siswa' => $data));
    }

    public function insert()
    {
        $this->load->view("main/add_siswa");
    }

    public function tambah()
        {
                $config['upload_path']          = './uploads/';
                $config['allowed_types']        = 'gif|jpg|png';
                $config['max_size']             = 100;
                $config['max_width']            = 1024;
                $config['max_height']           = 768;

                $this->load->library('upload', $config);

                if ( ! $this->upload->do_upload('userfile'))
                {
                        $error = array('error' => $this->upload->display_errors());

                        $this->load->view('upload_form', $error);
                }
                else
                {
                        $data = array('upload_data' => $this->upload->data());

                        $this->load->view('upload_success', $data);
                }
        }
}