PHP数据对象映射模式实例分析

CREATE TABLE `user` (
 `id` int(11) NOT NULL AUTO_INCREMENT,
 `name` varchar(32) CHARACTER SET utf8 DEFAULT NULL,
 `mobile` varchar(11) CHARACTER SET utf8 DEFAULT NULL,
 `regtime` timestamp NULL DEFAULT NULL ON UPDATE CURRENT_TIMESTAMP,
 PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=2 DEFAULT CHARSET=latin1;

<?php
namespace Common;
class User{
  public $id;
  public $name;
  public $mobile;
  public $regtime;
  protected $db;
  //构造方法
  function __construct($id) {
    $this->db = new Database\MySQLi();
    $conn = $this->db->connect('127.0.0.1', 'root', '', 'test');
    $res = $this->db->query("select * from user where id = {$id} limit 1");
    $data = $res->fetch_assoc();
    $this->id = $data['id'];
    $this->name = $data['name'];
    $this->mobile = $data['mobile'];
    $this->regtime = $data['regtime'];
  }
  //析构方法
  function __destruct() {
    $this->db->query("update user set name = '{$this->name}', mobile = '{$this->mobile}', regtime = '{$this->regtime}' where id = {$this->id} limit 1");
  }
}

<?php
namespace Common\Database;
use Common\IDatabase;
class MySQLi implements IDatabase{
  protected $conn;
  function connect($host, $user, $passwd, $dbname){
    $conn = mysqli_connect($host, $user, $passwd ,$dbname);
    $this->conn = $conn;
  }
  function query($sql){
    $res = mysqli_query($this->conn, $sql);
    return $res;
  }
  function close(){
    mysqli_close($this->conn);
  }
}

<?php
 define('BASEDIR',__DIR__); //定义根目录常量
 include BASEDIR.'/Common/Loader.php';
 spl_autoload_register('\\Common\\Loader::autoload');
 echo '<meta http-equiv="content-type" content="text/html;charset=utf8">';
 /*
 * 对对象属性的操作就完成了对数据库的操作
 */
 $user = new Common\User(1);
 //读取数据
 var_dump($user->id, $user->mobile, $user->name, $user->regtime);exit();
 $user->mobile = '13800138000';
 $user->name = 'Arshavin';
 $user->regtime = date("Y-m-d H:i:s",time());