c_login.php

<?php
defined('BASEPATH') or exit ('Akses langsung tidak diperbolehkan');

/**
 *
 */
class c_login extends CI_Controller{

  public function __construct(){
    parent::__construct();
    if ($this->session->userdata('username')) {
      redirect(base_url('admin'));
    }
    $this->load->model(array('m_login'));
  }

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

  public function proses(){
    $this->form_validation->set_rules('username','username','required|trim|xss_clean');
    $this->form_validation->set_rules('password','password','required|trim|xss_clean');
    if ($this->form_validation->run() == FALSE){
      $this->load->view('login');
    }
    else {
      $user = $this->input->post('username');
      $pass = $this->input->post('password');
      $u    = $user;
      $p    = sha1($pass);
      $cek  = $this->m_login->cek($u,$p);
      if ($cek->num_rows() > 0){
        foreach ($cek->result() as $row){
          $sess_data['username'] = $row->username;
          $sess_data['password'] = $row->passsword;
          $sess_data['nama']     = $row->nama;
          $this->session->set_userdata($sess_data);
        }
        $this->session->set_flashdata('succes','login berhasil');
        redirect('c_admin/admin');
      }
      else{
        $this->session->set_flashdata('result_login', 'Username atau Password yang anda masukkan salah.');
        redirect('c_login/login');
      }
    }
  }
}