CodeIgniter编写的简单留言板的DEMO

   小弟我第一次学习php，第一次用codeigniter编写demo，自己动手学习写东西总能够发现很多新知识。一下是小弟写的一个留言板的demo，请大家多多指教。

1、留言板的model类，与数据交互。

/**
 * 描述：留言板model类
 * author:[email protected]
 * */
class Guestbook_model extends CI_Model{
    const TBL_GB = 'guestbook';

    function __construct()
    {
        parent::__construct();
        $this->load->database();
    }

    function getGuestbooks()
    {
        $sql = "SELECT * FROM ".self::TBL_GB;
        $query = $this->db->query($sql);
        //返回条数
        $numRow = $query->num_rows();
        $resultRow = $query->result_array();
        return array('numRow'=>$numRow,'resultRow'=>$resultRow);
    }

    function get_guestbook($_id)
    {
        $sql = "SELECT * FROM ".self::TBL_GB." where id=?";
        $query = $this->db->query($sql,array($_id));
        return $query->result_array();
    }

    /*query方式实现插入*/
    function add_guestbook($arrs)
    {
        $sql = "insert into ".self::TBL_GB."(title,content,addtime) values (?,?,now())";
        $query = $this->db->query($sql,$arrs);
         return  $this->db->affected_rows();
    }

    /*query方式实现插入*/
    function add_guestbook_active($arrs)
    {
        $this->db->insert(self::TBL_GB,$arrs);
        return  $this->db->affected_rows();
    }

    function edit_guestbook($arrs)
    {
        $sql = "update ".self::TBL_GB." set title=?,content=? where id=?";
        $query = $this->db->query($sql,$arrs);
        return  $this->db->affected_rows();
    }

    function delete_guestbook($_id)
    {
        $this->db->where('id',$_id);
        $this->db->delete(self::TBL_GB);
    }

}

/*End of guestbook_model.php */
/*Location: /application/models/guestbook_model.php */

2、留言板的controller类，处理页面请求等。

 

if ( ! defined('BASEPATH')) exit('No direct script access allowed');
/**
 * 描述：留言板controller类
 * author:[email protected]
 * */
class Guestbook extends CI_Controller{

    public function __construct()
    {
        parent::__construct();
        $this->load->helper(array('form','url'));   //加载辅助函数
        $this->load->model('Guestbook_model');
        $this->load->library('form_validation'); //表单验证类
    }

    function index()
    {
        header("Content-type:text/html;charset=utf-8");

        $data['title'] = 'CI-留言板首页';

        $result = $this->Guestbook_model->getGuestbooks();
        $data['guestbooks'] = $result;

        $this->load->view('guestbook/header',$data);
        $this->load->view('guestbook/index',$data);
        $this->load->view('guestbook/footer.html');
    }

    /*添加留言界面*/
    function add()
    {
        header("Content-type:text/html;charset=utf-8");

        $data['title'] = 'CI-留言板首页';

        $this->load->view('guestbook/header',$data);
        $this->load->view('guestbook/add');
        $this->load->view('guestbook/footer.html');
    }

      /*添加留言数据处理*/
    function add_guestbook()
    {
        header("Content-type:text/html;charset=utf-8");

        $data['title'] = 'CI-留言板首页';

        $this->form_validation->set_rules('title','Title','required');
        $this->form_validation->set_rules('content','Content','required');

        if($this->form_validation->run() == FALSE)
        {
            $data['title'] = 'CI-留言板首页';
            $data['errors'] = validation_errors();

            $this->load->view('guestbook/header',$data);
            $this->load->view('guestbook/add');
            $this->load->view('guestbook/footer.html');
        }
        else
        {
            /*$data = array($this->input->post('title'),$this->input->post('content'));
            $result = $this->Guestbook_model->add_guestbook($data);*/
            $data = array('title' => $this->input->post('title'),
                    'content' => $this->input->post('content'));
            $result = $this->Guestbook_model->add_guestbook_active($data);
            redirect(site_url('guestbook'));
        }

    }

    /*修改页面*/
    function edit($_id)
    {
        header("Content-type:text/html;charset=utf-8");

        $data['title'] = 'CI-留言板修改信息页面';

        $result = $this->Guestbook_model->get_guestbook($_id);

        $data['result'] = $result[0];
        $this->load->view('guestbook/header',$data);
        $this->load->view('guestbook/edit',$data);
        $this->load->view('guestbook/footer.html');

    }

    /**
     * 修改留言信息
     * */
    function edit_guestbook()
    {
        header("Content-type:text/html;charset=utf-8");

        $data['title'] = 'CI-留言板首页';

        $this->form_validation->set_rules('title','标题','required');
        $this->form_validation->set_rules('content','内容','required');

        if($this->form_validation->run() == FALSE)
        {
            $data['title'] = 'CI-留言板首页';
            $data['errors'] = validation_errors();
            $this->load->view('guestbook/header',$data);
            $this->load->view('guestbook/edit');
            $this->load->view('guestbook/footer.html');
        }
        else
        {
            $data = array($this->input->post('title'),
                          $this->input->post('content'),
                          $this->input->post('hid'));

             $result = $this->Guestbook_model->edit_guestbook($data);

              redirect(site_url('guestbook'));
        }

    }

    /*删除留言信息*/
    function delete($_id)
    {
         $result = $this->Guestbook_model->delete_guestbook($_id);

         redirect(site_url('guestbook'));
    }
}

/*End of guestbook.php */
/*Location: /application/controllers/guestbook.php */

以上是简单留言板核心的代码，很多地方写的不好，请大家多多指教。
以下是源码，请大家多多指教！