public Label tambahLabel(String judul, String warnaLatar) {
   Label res = new Label(-1, judul, getUrutanTerbesarLabel() + 1, warnaLatar);
   SQLiteDatabase db = helper.getWritableDatabase();
   long _id = db.insert(Db.TABEL_Label, null, res.toContentValues());
   if (_id == -1) {
     return null;
   } else {
     res._id = _id;
     return res;
   }
 }
 public void updateLabel(Label label) {
   SQLiteDatabase db = helper.getWritableDatabase();
   ContentValues cv = label.toContentValues();
   db.update(Db.TABEL_Label, cv, "_id=?", new String[] {String.valueOf(label._id)}); // $NON-NLS-1$
 }