數據對象映射模式(及對象的相關屬性和數據庫表中的字段一一對應)

<?php
define("BASDIR",__DIR__);
include BASDIR."/Phpclass/Loader.php";
spl_autoload_register("\\Phpclass\\Loader::autoload_rege");

$user = new \Phpclass\User(1);

var_dump($user->id,$user->username,$user->phone_no,$user->retime);

$user->username = "nfyx1";//這里相當於 給user類中的屬性賦值
$user->phone_no = "132451111111";
$user->retime = date("Y-m-d H-i-s");

//最后，在程序執行完時，調用__destruct()函數，把函數里的代碼調協成update sql 語句，這時改變當前值，就等於更新一條數據。
-----------------------------------------------------------------------------------Index4.php

<?php
//對應的映射到數據庫中的user表
namespace Phpclass;


class User
{
 public $id;
 public $username;
 public $phone_no;
 public $retime;

 protected $db;

 function __construct($id)
 {
 $this->db= new Databases\Mysqlis();//創建一個Mysqlis對象，並把他保存到$db中；這里依賴於Databases目錄下的Mysqlis.php文件
 $this->db->connect("127.0.0.1","root","root","nfyx");//連接
 $res=$this->db->query("select * from user where id=$id");//查詢

 $data=$res->fetch_assoc();//把結果集遍歷成一個數組$data;

 $this->id=$data['id'];//把數組中的值 賦值 給當前對應的變量；
 $this->username=$data['username'];
 $this->phone_no=$data['phone_no'];
 $this->retime=$data['retime'];


 }
 function __destruct()
 {
 $this->db->query("update user set username='{$this->username}',phone_no='{$this->phone_no}',retime='{$this->retime}' where id='{$this->id}'");
 }

}

-----------------------------------------------------------------------------------User.php,對應的數據庫里的表