设计模式之数据映射模式

数据映射模式其实用过laravel框架的话已经接触过了，laravel中的ORM就是用的数据映射模式

class Mysqli{
private $conn;
function connect($host, $user, $pass, $dbname){
$conn = mysqli_connect($host, $user, $pass, $dbname);
mysqli_query($conn, "set names utf8");
$this->conn = $conn;
}

function query($sql){
$res = mysqli_query($this->conn, $sql);
return $res;
}

function close(){
mysqli_close($this->conn);
}
}

首先创建一个Mysqli的类，方便之后调用。

class User{
public $id;
public $name;
public $age;
public $nickname;

protected $db;

function __construct($id){
$this->db = new Mysqli();
$this->db->connect('127.0.0.1', 'root', '', 'test');
$res = $this->db->query("select * from user where id=$id");
$data = $res->fetch_assoc();

$this->id = $id;
$this->name = $data['name'];
$this->age = $data['age'];
$this->nickname = $data['nickname'];
}

function __destruct(){
$this->db->query("update user set name='{$this->name}',age={$this->age},nickname='{$this->nickname}' where id={$this->id}");
}
}

User表的结构如下



然后我们对User进行操作

$user = new Tool\User(1);
$user->name = 'Lee';
$user->age = '23';
$user->nickname = '大毛';

执行完后结果如图



当然ORM肯定不止那么简单，还需要后续的深入学习