我找不到类DB代码错误（laravel 4）

I want use class DB in code, my code this file klasa.php in directory helpers (Ja zamierzam użyć klasy DB w kodzie mój kod to plik klasa.php w katalogu helpers) File klasa.php

   <?php
 //namespace App\Helpers;
   //use ...\Form;
  namespace App\Http\Controllers;

use DB;
use App\Quotation;
class SomeClass
  {
public static function SomeMethod()
{
  print "<font color=red>Dobrze</font>";
}

public static function dodaj_staty($ip,$http_user_agent,$co_robil) {
  //$system = $this->system_operacyjny($http_user_agent);
  //$przegla = $this->przegladarka($http_user_agent);
  $system = "tomi";
  $przegla = "tomek";
  $sql = 'INSERT INTO statystyki (aa, bb, cc,fff,gg,iii)
  VALUES (?, ?, ?,?,?,?)';
  $data = time();
  $data1 = array($data, $system ,$przegla,$http_user_agent,$co_robil,$ip);
   //on this line return error  PHP Fatal error:  Class 'App\\Helpers\\SomeClass' not found
  \DB::insert($sql, $data1);






}

this function call in file (tą funkcje wywołuje plik)

    $a = new \App\Helpers\SomeClass();
 $a->dodaj_staty('d','dd','g');

you see use these instructions (wy widzicie użyłem takich instrukcji)

 namespace App\Http\Controllers;

 use DB;
   use App\Quotation;

on this application itself is used logon and this use mysql and it works good, maybe because that not use instructions DB::select. I changed instructions DB::insert at $ff = DB::select and not it was any errors, but how printers variable $ff then see error.