php设计模式 数据对象映射模式

数据对象映射模式，是将对象和数据存储映射起来，对一个对象的操作会映射为对数据存储的操作。

在代码中实现数据对象映射模式，实现一个ORM类，将复杂的sql语句映射成对象属性的操作。对象关系映射（Object Relational Mapping，ORM）

ha_cl表

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" alt="" />

Hacl.php

<?php
namespace Baobab;

class Hacl{
    public $id;
    public $haclname;
    public $haclcode;
    public $hacls;
    protected $db;
    function __construct($id){
        $this->db = new \Baobab\Database\Mysqli();
        $this->db->connect('127.0.0.1', 'root', '', 'test');
        $res = $this->db->query("select * from ha_cl where ID = {$id}");
        $data = $res->fetch_assoc();
        $this->id = $data['ID'];
        $this->haclname = $data['ha_cl_name'];
        $this->haclcode = $data['ha_cl_code'];
        $this->hacls = $data['hacls'];
    }
    function __destruct(){
        $this->db->query("update ha_cl set
                          ha_cl_code = '{$this->haclcode}',
                          ha_cl_name = '{$this->haclname}',
                          hacls = '{$this->hacls}'
                          where ID = {$this->id}
                          limit 1");
    }

}

Factory.php

<?php
namespace Baobab;

class Factory{
    static function getHacl($id){
        $key = 'user_'.$id;
        $user = \Baobab\Register::get($key);//表中id不同表示的是不同的对象
        if(!$user){
            $user = new \Baobab\Hacl($id);
            \Baobab\Register::set($key, $user);
        }
        return $user;
    }
}

Register.php

<?php
namespace Baobab;

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

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

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

index.php

class Page{
    function index(){
        $hacl = Baobab\Factory::getHacl(13);
        $hacl->haclname = '测试名称';
        $this->test();
        echo 'ok';
    }

    function test(){
        $hacl = Baobab\Factory::getHacl(13);
        $hacl->hacls = '测试内容';
    }
}

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

使用工厂模式会多次创建对象Hacl，浪费资源，如果将对象作为参数传递，一方面会带来额外的使用成本，另外如果很多地方都用到这个对象很容易发生错误，因此在工厂模式中使用注册树模式来解决这个问题。