public function delJurusan($id)
 {
     $jur = new Jurusan($this->registry);
     if (is_null($id)) {
         throw new Exception();
         echo "id belum dimasukkan!";
         return;
     }
     $jur->set_kode_jur($id);
     $jur->delete_jurusan();
     header('location:' . URL . 'admin/addJurusan');
 }