CodeIgniter フレームワークの基本的な追加、削除、変更

CREATE TABLE IF NOT EXISTS `users` (
 `id` int(10) NOT NULL AUTO_INCREMENT,
 `username` varchar(50) NOT NULL,
 `password` varchar(50) NOT NULL,
 `email` varchar(100) NOT NULL,
 `fullname` varchar(100) NOT NULL,
 PRIMARY KEY (`id`),
 UNIQUE KEY `username` (`username`),
 UNIQUE KEY `email` (`email`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8;

<?php
  class MTest extends CI_Model{
    public function __construct(){
      parent::__construct();
      $this->load->database();
    }
    //insert into data
    public function insert_users($arr){
      $this->db->insert(&#39;users&#39;,$arr);
    }
    //delete data
    public function delete_users($id){
      $this->db->where(&#39;id&#39;,$id);
      $this->db->delete(&#39;users&#39;);
    }
    //Alter data
    public function update_users($username,$arr){
      $this->db->where(&#39;username&#39;,$username);
      $this->db->update(&#39;users&#39;,$arr);
    }
    //select data
    public function select_users($id){
      $this->db->where(&#39;id&#39;,$id);
      $this->db->select(&#39;*&#39;);
      return $this->db->get(&#39;users&#39;);
      //注意如果你返回的是以下内容的话，他就是一个对象的结果集，这样当你返回controller中时，你就得转换；
//     return $query->result();
    }
  }
?>

<?php
/**
 * xxx.php
 * ==============================================
 * Copy right 2012-2015
 * ----------------------------------------------
 * This is not a free software, without any authorization is not allowed to use and spread.
 * ==============================================
 * @Author:YeXianMing
 * @Email:LangWaiShiGe@hotmail.com
 * @Version:zend studio10.6.2 php5.4.38 apache2.2
 */
  if(!defined(&#39;BASEPATH&#39;))exit(&#39;No direct script access allowed&#39;);
  class Home extends CI_Controller{
    public function __construct(){
      parent::__construct();
    }
    //insert data
    public function insert(){
      $this->load->model(&#39;MTest&#39;,&#39;&#39;,TRUE);
      $arr=array(&#39;username&#39;=>&#39;yexianming1&#39;,&#39;password&#39;=>&#39;admin&#39;,&#39;email&#39;=>&#39;11504160314qq.com&#39;,&#39;fullname&#39;=>&#39;luotianyexianming&#39;);
      if(!($this->MTest->insert_users($arr))){
        echo "插入数据成功";
      }else{
        echo "插入数据失败";
      }
    }
    //update data
    public function update(){
      $this->load->model(&#39;MTest&#39;,&#39;&#39;,TRUE);
      $arr=array(&#39;username&#39;=>&#39;Helloworld22&#39;,&#39;password&#39;=>&#39;root&#39;,&#39;email&#39;=>&#39;895787704@qq.com&#39;,&#39;fullname&#39;=>&#39;luotianyecong&#39;);
      if(!($this->MTest->update_users(&#39;Helloworld&#39;,$arr))){
        echo "修改成功";
      }else{
        echo "修改失败";
      }
    }
    //delete data
    public function delete(){
      $this->load->model(&#39;MTest&#39;,&#39;&#39;,TRUE);
      $query=$this->MTest->delete_users(12);
      if(!$query){
        echo "删除成功";
      }else{
        echo "删除失败";
      }
    }
    //select data
    public function select(){
      $this->load->library(&#39;table&#39;);
      $this->load->model(&#39;MTest&#39;,&#39;&#39;,TRUE);
      $arr=$this->MTest->select_users(3);
      $userinformation=$this->table->generate($arr);
      $data[&#39;userinfor&#39;]=$userinformation;
      $this->load->view(&#39;template&#39;,$data);
    }
  }
?>

<?php echo $userinfor;?>

id username password email fullname
3 Helloworld22 root 1111111@qq.com luotianyecong