private void getDataFromUserTable () {
        try {
            connection = DriverManager.getConnection(Utils.DB_URL);
            statement = connection.createStatement();
            resultSet = statement.executeQuery("SELECT id, name, date_created, date_lastlog FROM User");
            while (resultSet.next()) {
                userIdList.add(resultSet.getInt("id"));
                nameList.add(resultSet.getString("name"));
                regDateList.add(resultSet.getString("date_created"));
                lastLogDateList.add(resultSet.getString("date_lastlog"));
            }
        } catch (SQLException e) {
            e.printStackTrace();
        }
        finally {
            try {
                connection.close();
                statement.close();
            } catch (SQLException e) {
                e.printStackTrace();
            }
        }
    }