use Phalcon\Mvc\Model;

class Ntime extends Model {

    //id

    public $id;

    //国家cid

    public $name;

    //省市id

    public $create_time;

	public static $table_name;

	public function initialize()

	{

		$this->setSource(self::$table_name);

	}

}

public function indexAction()

    {

		//一

		\Ntime::$table_name = 'ntime2015';

		$result = $this->modelsManager->createBuilder()

           ->columns("id,name,create_time")

           ->from("Ntime")

            ->orderBy("id ASC")

			->getQuery()

			->execute()

			->toArray();

		//二

		\Ntime::$table_name = 'ntime2017';

		$result = \Ntime::find([

			'limit'=>2

		])->toArray();      

		var_dump($result);

		echo "gaga";

		exit;

    }