DB Update in Android

I would like update a particular field with default value only if the DB has been upgraded (version number). I am trying the following:

@Override
    public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion)
    {
        db.execSQL("DROP TABLE IF EXISTS " + TABLE_A_DETAILS_LOCAL);
        db.execSQL("DROP TABLE IF EXISTS " + TABLE_T_DETAILS_LOCAL);
        onCreate(db);
        updateTable();
    }

    public void updateTable()
    {
        SQLiteDatabase db = this.getWritableDatabase();
        ContentValues values = new ContentValues();

        String logstatus = "temp";

        values.put(KEY_USER, logstatus);

        db.update(TABLE_USERNAME, values, null, null);
        db.close();
    }

I am getting error : java.lang.IllegalStateException: getDatabase called recursively

All I need to update table_username field's item with temp this is only when I upgrade my DBvalue.

I am not sure why am I getting an error like this?

Thanks!