Help creating a login applet with JDBC

Question

Hi, I'm trying to create a login applet using a table from a database (created with Microsoft Access). The bottom line is that I have very little knowledge of ActionListeners. I do know some things about JDBC, but most of it is through notes and lots of reading. I was wondering how to go about looking through a table (with two columns, user and password), to see if it matches what is typed into a JTextField and a JPasswordField. Just a sample piece of code would be helpful. Thank you very much in advanced. Also, I have the GUI done for what I need, just no ActionListeners or JDBC functionality implemented. Here it is:
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import java.sql.*;
public class login extends JFrame /*implements ActionListener*/ {
     private Container container;
     private GridBagLayout layout;
     private GridBagConstraints gbc;
     public login()
          super("Login");
          setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
        setSize(300,130);
        setLocationRelativeTo(null);
          container = getContentPane();
          layout = new GridBagLayout();
          container.setLayout(layout);
          gbc = new GridBagConstraints();
          labelUser = new JLabel("Username:");
          gbc.insets = new Insets(2,2,2,2);
          container.add(labelUser, gbc);
          textUser = new JTextField(15);
          gbc.gridx = 1;
          gbc.gridwidth = 3;
          container.add(textUser, gbc);
          labelPassword = new JLabel("Password:");
          gbc.gridy = 1;
          gbc.gridx = 0;
          gbc.gridwidth = 1;
          container.add(labelPassword, gbc);
          textPassword = new JPasswordField(15);
          gbc.gridx = 1;
          gbc.gridwidth = 3;
          container.add(textPassword, gbc);
          button1 = new JButton("Login");
          gbc.gridy = 2;
          gbc.gridx = 1;
          gbc.gridwidth = 1;
          container.add(button1, gbc);
          button2 = new JButton("Cancel");
          gbc.gridx = 2;
          container.add(button2, gbc);
     public static void main(String args[]) {
        new login().setVisible(true);
    private JButton button1, button2;
    private JLabel labelUser, labelPassword;
    private JTextField textUser;
    private JPasswordField textPassword;
}Thank you again in advanced.

Answer 1

Sir,
Much of your question makes middling sense to me. You say applet but you have JFrame for example. I would caution you right now an applet with access for a DB is asking for trouble. Never minding the various security issues Access is not really intended for this sort of operation.
Now none of that actually seems to be your question but I just thought I'd address that before you go too far down a road fraught with peril.
As far as what I think you are asking assuming our table looks like this.
tblUser
username VARCHAR (access text field) primary key
password VARCHAR (again known in access as text)then the code would look something like this...
Connection c; //create your connection
PreparedStatement ps = c.prepareStatement("SELECT username FROM tblUser WHERE username=? AND password=?");
ps.setString(1,usernameVariable);
ps.setString(2,passwordVariable);
ResultSet rs = ps.executeQuery();
if(rs.next()){
  // login successful
}else{
  // login failed!
rs.close();
ps.close();
c.close();Also duffymo will be unhappy if I don't mention that you will really want to give second thought to mixing your database code with your GUI code. Please take a gander through http://java.sun.com/blueprints/patterns/MVC.html
Sincerely,
Slappy