laravel5命名空间问题

Question

在laravel5中使用类方法时需要use,
能不能一次性全部引入?

经常不知道要引入哪个好

<?php namespace App\Http\Controllers;
use Request;
use Session;
use View;
use DB;
class TestController extends Controller {

    public function getIndex()
    {
        $data['name']='laravel';
        return View::make('hi',$data);
    }

    public function getName(){
        $rs=DB::select("select * from cf_user");
        print_r($rs);
    }
    //获取ip地址
    public function getIp(){
        echo Request::ip();
    }

    //
    public function getTest(){
        echo 123;
    }

    public function getDetail($id){
        echo $id;
    }
    public function getFullUrl(){
        echo Request::fullUrl();
    }

    public function getType(){
        echo Request::method();
    }

    public function getRoot(){
        echo Request::root();
    }

    public function getUrl(){
        echo Request::url();
    }

    public function getSe(){
        print_r(Request::segments());
    }

    public function getAll(){
        print_r(Request::all());
    }
    public function getH(){
        print_r(Request::header('cookie'));
    }
    public function getServer(){
        print_r(Request::server());
    }

    public function getSession(){
        print_r(Request::session());
    }
}

Answer 1

php//直接顶级命名空间
 public function getName(){
        $rs=\DB::select("select * from cf_user");
        print_r($rs);
    }
//获取ip地址
    public function getIp(){
        echo \Request::ip();
    }

Answer 2

当你要用到什么就引入什么呗，不然你这个做法不就相当于把所有项目文件内容全都引到一个文件内容有什么区别嘛，虽然麻烦，但是这是必须要适应地过程