Problems setting up username & password for SQL

Question

Due to the outstanding advice I recieved from this excellent forum, I have managed to overcome my first problem with declaring a new Class.
This leads me to request help with my next biggest problem:
Setting up a user GUI that takes a "username" & "password" that will be used to access a password protected database.
I am a simple bloke, with simple thought processes, so please, go easy on me...
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import java.sql.*;
public class DBQuery1 {
     String username = "" , password = "";
     public static void main(String[] arguments) {
          PassDB UPass = new PassDB();
          String data = "jdbc:odbc:JavaTestDataBase";
          try {
               Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
               Connection conn = DriverManager.getConnection(data, "" + username, "" + password);
               Statement st = conn.createStatement();
               ResultSet rec = st.executeQuery(
                    "SELECT Title, ContactID, First, Last, Dear FROM Contacts "
                    + "WHERE (Title='Mr') ORDER BY ContactID");
          /*     ResultSet rec2 = st.executeQuery(
                    "SELECT Subject, ContactID FROM Calls "
                    + "WHERE (Subject Is Not Null) ORDER BY ContactID");
          System.out.println("\nFirst Name\tSurname\t\tNick Name\t\tSubject\n");
          while(rec.next()) {
               System.out.println(rec.getString(3) + "\t\t" + rec.getString(4) + "\t\t" + rec.getString(5) /* + rec2.getString(1) */ );
          st.close();
          catch (SQLException s) {
               System.out.println("SQL Error: " + s.toString() + " " + s.getErrorCode() + " " + s.getSQLState());
          catch (Exception e) {
               System.out.println("Error: " + e.toString() + e.getMessage());
class PassDB extends javax.swing.JFrame implements ActionListener {
     String username = "", password = "";
     JTextField uname = new JTextField(10);
     JTextField pword = new JTextField(10);
     // JPasswordField pword = new JTextField(10);
     PassDB() {
          super("duBe's database logon");
          setSize(220, 160);
          setDefaultCloseOperation(EXIT_ON_CLOSE);
          JPanel pane = new JPanel();
          JLabel unameLabel = new JLabel ("Username: ");
          JLabel pwordLabel = new JLabel ("Password: ");
          JButton submit = new JButton("OK");
          submit.addActionListener(this);
          pane.add(unameLabel);
          pane.add(uname);
          pane.add(pwordLabel);
          pane.add(pword);
          pane.add(submit);
          setContentPane(pane);
          setVisible(true);
     public void actionPerformed(ActionEvent evt) {
          PassDB clicked = (PassDB)evt.getSource();
          username = uname.getText();
          password = pword.getText();
This code generates two errors, stating:
C:\Java_progs>javac DBQuery1.java
DBQuery1.java:14: non-static variable username cannot be referenced from a static context
Connection conn = DriverManager.getConnection(data, "" +
username, "" + password);
^
DBQuery1.java:14: non-static variable password cannot be referenced from a static context
Connection conn = DriverManager.getConnection(data, "" +
username, "" + password);
                ^
2 errors*****************************
The code works when I remove the reference to the variables "username" & "password" in Connection "conn" call & replace them with the actual username & password, but this is not exactly what I was after. I was hoping to make the program responsive to each individual user, not set in code.
I also would like to make the program pause after the call in "main" to "PassDB" to wait for "PassDB" to exit before continuing.
I would also like to make "PassDB" destroy itself after the "OK" button is pressed & the "username" & "password" set.
If that isn't enough for you, I would really like the program to search 2 different database tables, return their values & compare them to be sure that they are the same.
When I try & search 2 different tables, as in:
ResultSet rec = st.executeQuery(
                    "SELECT Title, ContactID, First, Last, Dear FROM Contacts "
                    + "WHERE (Title='Mr') ORDER BY ContactID");
               ResultSet rec2 = st.executeQuery(
                    "SELECT Subject, ContactID FROM Calls "
                    + "WHERE (Subject Is Not Null) ORDER BY ContactID")javac tells me that "ResultSet" is set to null 0
As always, I am extremely appreciative of any assistance you are able to offer.
Kind regards
duBedat
[email protected]

Answer 1

This is where I'm at now:
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import java.sql.*;
public class DBQuery {
     static String username = "" ;
     static String password = "" ;
     public static void main(String[] arguments) {
     PassDB UPass = new PassDB();
     String data = "jdbc:odbc:JavaTestDataBase";
     try {
          Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
          Connection conn = DriverManager.getConnection(data, "" + DBQuery.username, "" + DBQuery.password);
          Statement st = conn.createStatement();
          ResultSet rec = st.executeQuery(
          "SELECT Title, ContactID, First, Last, Dear FROM Contacts "
          + "WHERE (Title='Mr') ORDER BY ContactID");
          /*     ResultSet rec2 = st.executeQuery(
               "SELECT Subject, ContactID FROM Calls "
               + "WHERE (Subject Is Not Null) ORDER BY ContactID");
          System.out.println("\nFirst Name\tSurname\t\tNick Name\t\tSubject\n");
          while(rec.next()) {
               System.out.println(rec.getString(3) + "\t\t" + rec.getString(4) + "\t\t" + rec.getString(5) /* + rec2.getString(1) */ );
          st.close();
     catch (SQLException s) {
          System.out.println("SQL Error: " + s.toString() + " " + s.getErrorCode() + " " + s.getSQLState());
     catch (Exception e) {
          System.out.println("Error: " + e.toString() + e.getMessage());
class PassDB extends javax.swing.JFrame implements ActionListener {
     static boolean getOut = false;
     JTextField uname = new JTextField(10);
     JTextField pword = new JTextField(10);
     // JPasswordField pword = new JTextField(10);
     public PassDB() {
          super("duBe's database logon");
          setSize(220, 160);
          setDefaultCloseOperation(EXIT_ON_CLOSE);
          JPanel pane = new JPanel();          
          JLabel unameLabel = new JLabel ("Username: ");
          JLabel pwordLabel = new JLabel ("Password: ");
          JButton submit = new JButton("OK");
          submit.addActionListener(this);
          pane.add(unameLabel);
          pane.add(uname);
          pane.add(pwordLabel);
          pane.add(pword);
          pane.add(submit);
          setContentPane(pane);
          while(getOut == false)
               setVisible(true);                         
     public void actionPerformed(ActionEvent evt) {
          PassDB clicked = (PassDB)evt.getSource();
          DBQuery.username = uname.getText();
          DBQuery.password = pword.getText();
          getOut = true;               
}          Any advice is greatly appreciated
duBe