class ProvinceModel extends Model{

	public static $data;

	public static $name;

	public function __construct(){

		parent::__construct();

		$this::$name='province_list';//name of obj

		$this::$table='china_province';

		$this::$primary_key='provinceid';

	}

}

class CityModel extends Model{

	public static $data;

	public static $name;

	public function __construct(){

		parent::__construct();

		$this::$name='city_list';//name of obj

		$this::$table='china_city';

		$this::$primary_key='cityid';

	}

}

class AreaModel extends Model{

	public static $data;

	public static $name;

	public function __construct(){

		parent::__construct();

		$this::$name='area_list';//name of obj

		$this::$table='china_area';

		$this::$primary_key='areaid';

	}

}

$province_model=new ProvinceModel();

$province_model::$data=$province_model::all();

$city_model=new CityModel();

$city_model::$data=$city_model::all();

$area_model=new AreaModel();

$area_model::$data=$area_model::all();

$city_model->HasMany($area_model,'cityid');

$province_model->HasMany($city_model,'provinceid');