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数据对象映射模式

2024-08-29 04:05:35   217人阅读

定义：将对象和数据存储映射起来，对一个对象的操作会映射为数据存储的操作
综合应用实例：在代码中实现数据对象映射模式，我们将实现一个ORM类，将复杂的SQL语句映射成对象属性的操作，结合使用数据对象映射模式，工程模式，注册模式

$page = new Page();
$page->index();

class Page
{
    function index()
    {
        $user = \IMooc\Factory::getUser(1);
        $user->name= ‘fango0‘;
        $this->test();
    }

    function test()
    {
        $user = \IMooc\Factory::getUser(1);
        $user->moblie = ‘19123230‘;
    }
}

<?php
namespace IMooc;

class User
{
    public $id;
    public $name;
    public $moblie;
    public $regtime;

    protected $db;

    function __construct($id)
    {
        $this->db = new  \IMooc\Database\MySQLi();
        $this->db->connect(‘127.0.0.1‘, ‘root‘, ‘root‘, ‘test‘);
        $res = $this->db->query("select * from user limit 1");
        $data = $res->fetch_assoc();
        $this->id = $data[‘id‘];
        $this->name = $data[‘name‘];
        $this->mobile = $data[‘mobile‘];
        $this->regtime = $data[‘regtime‘];
    }

    function __destruct()
    {
        $this->db->query("update user set name = ‘{$this->name}‘,mobile=‘{$this->moblie}‘,regtime=‘{$this->regtime}‘ WHERE id={$this->id}");
    }

}

<?php
namespace IMooc;

class Factory
{
    static function getUser($id)
    {
        $key = ‘user_‘.$id;
        $user = Register::get($key);
        if (!$user)
        {
            $user = new User($id);
            Register::set($key, $user);
        }
        return $user;
    }
}

<?php
namespace IMooc;

class Register
{
    protected static $objects;

    static function set($alias, $object)
    {
        self::$objects[$alias] = $object;
    }

    static function get($alias)
    {
        return self::$objects[$alias];
    }

    function _unset($alias)
    {
        unset(self::$objects[$alias]);
    }
}




来自为知笔记(Wiz)


数据对象映射模式


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