public void lastTemperature(ActionEvent actionEvent) throws SQLException {

        Connection conn = dbConnection.getConnection();
        this.data = FXCollections.observableArrayList();

        ResultSet rs = conn.createStatement().executeQuery(sql);
        rs.last();  // ostatni rekord

        this.data.add(new Data(rs.getString(1), rs.getString(2), rs.getString(3)));
        System.out.println((" ID= " + rs.getString(1) + " TEMP= " + rs.getString(2) + "[°C] " + " TIME= " + rs.getString(3)));

        lasttemperaturefieldx.setText((" TEMP= " + rs.getString(2) + "[°C] " + " TIME= " + rs.getString(3)));
    }