public void addPersonToGroup(String email, String nameGroup) {
        int idGroup = 0;
        int idPerson = 0;

        SQLiteDatabase db1 = this.getReadableDatabase();

        Cursor cursor = db1.query(
                TABLE_PERSON,                            // The table to query
                new String[]{KEY_PERSON_ID},            // The columns to return
                "email = " + email,                    // The columns for the WHERE clause
                null,                                    // The values for the WHERE clause
                null,                                   // don't group the rows
                null,                                    // don't filter by row groups
                null                                    // The sort order
        );  // http://stackoverflow.com/questions/1243199/how-to-perform-an-sqlite-query-within-an-android-application
        // http://developer.android.com/training/basics/data-storage/databases.html#ReadDbRow

        if (cursor != null && cursor.moveToFirst()) { // http://www.android4devs.pl/2011/07/sqlite-androidzie-kompletny-poradnik-dla-poczatkujacych/
            idPerson = Integer.parseInt(cursor.getString(cursor.getColumnIndex(KEY_PERSON_ID)));
        }


        Cursor cursor2 = db1.query(
                TABLE_GROUP,                            // The table to query
                new String[]{KEY_GROUP_ID},            // The columns to return
                "name = " + nameGroup,                    // The columns for the WHERE clause
                null,                                    // The values for the WHERE clause
                null,                                   // don't group the rows
                null,                                    // don't filter by row groups
                null                                    // The sort order
        );  // http://stackoverflow.com/questions/1243199/how-to-perform-an-sqlite-query-within-an-android-application
        // http://developer.android.com/training/basics/data-storage/databases.html#ReadDbRow

        if (cursor != null && cursor.moveToFirst()) { // http://www.android4devs.pl/2011/07/sqlite-androidzie-kompletny-poradnik-dla-poczatkujacych/
            idGroup = Integer.parseInt(cursor.getString(cursor.getColumnIndex(KEY_GROUP_ID)));
        }

        if (idPerson == 0 || idGroup == 0) {
            Log.e(TAG, "addPersonToGroup  idPerson, idGroup " + idPerson + " " + idGroup );
            return;
        }

        SQLiteDatabase db = this.getWritableDatabase();

        ContentValues values = new ContentValues();
        values.put(KEY_PERSONGROUP_IDGROUP, idGroup);
        values.put(KEY_PERSONGROUP_IDPERSON, idPerson);

        long id = db.insert(TABLE_PERSONGROUP, null, values);
        db.close();

        Log.d(TAG, "New PERSONGROUP inserted into sqlite: " + id);

    }