class Main extends CI_Controller 
{
 function __construct()
 {
  parent::__construct();
  $this->load->helper('url');
  $this->load->library('pagination');
  $this->load->model('Db', '' , TRUE);
 }
 public function index($offset = '')
 {
  echo $_GET['per_page'];
  $limit = 11;
  $config['base_url'] = '/index.php/main';
  $config['total_rows'] = $this->Db->allRows();
  $config['per_page'] = $limit;
  $config['use+page_numbers'] = TRUE;
  
  $this->pagination->initialize($config); 
  
  $data['pagination'] = $this->pagination->create_links();

  $data['bbs'] = $this->Db->allSlectBbs($limit , $offset);
  $this->load->view('main', $data);
 }
}

class Db extends CI_Model
{
// var $title  = "";
// var $content = "";
 function __construct()
 {
  parent::__construct();
 }
 public function allSlectBbs($limit , $offset)
 {
  $this->db->limit($limit , $offset);

  $query = $this->db->get('bbs');
  return $query->result();
 }
 public function allRows()
 {
  return $this->db->count_all('bbs');
 }
}