堆栈在用户上插入或更新sql表

Question

您好我正在尝试创建一个包含用户的程序，每个用户都可以计算他的付款，因为他的每小时工资值以及他工作了多少小时。

我堆叠在按钮上，为特定用户增加了几个小时或更新

usernameGL - ＆gt;全局变量（public static String usernameGL =“”;） Connect（） - ＆gt;方法（工作！）

我正在使用Access DB和java

    private void addBT_actionPerformed(ActionEvent e) {
    double hours1 = 0.0;
    double hoursTable = 0.0;

    hours1 =
            Double.parseDouble(JOptionPane.showInputDialog(this, "How many hours did u work?", JOptionPane.QUESTION_MESSAGE));

    //establish connection
    Connect();

    try {
        ResultSet result;
        Statement state = conn.createStatement();
        String SQL = "SELECT Att.hours FROM Att WHERE Att.ID = users1.ID AND users1.username='" + usernameGL + "'";
        result = state.executeQuery(SQL);

        if (result.next()) {
            hoursTable = result.getDouble("hours");
            if (hoursTable == 0) {
                SQL = "INSERT INTO Att (hours) VALUES (" + hours1+")";
                result = state.executeQuery(SQL);

                String hoursString = toString().valueOf(hoursTable);
                currentTF.setText(hoursString);

            } else if (hoursTable > 0) {
                double total = hoursTable + hours1;
                SQL = "UPDATE Att SET hours= (" + total + ") WHERE hours = (" + hoursTable+")";

                String hoursString = toString().valueOf(total);
                currentTF.setText(hoursString);
            }

        }


    } catch (SQLException f) {
    }
}