Problem with SQL used in JDBC

Question

I am working on a Code, in which I have to read the input from the MS ACCESS and give the output on the GUI, The problem is that,the First Feild in the MS Access Table is Integer Numbers which is ID of the person, when I execute the Following code using the ID feild in the SQl query it gives me SQL exceptions, but when I used First name feild in the SQL query then It gives me right answer.
Please tell me where is Am making the mistake, I have some Idea tht it is some thing to do with the ID feild in the SQL query.
Please Help me.
// Haroon Usman Chaudhry.
// CSC 224, section 202
// Project GradesFromDB
//Submission Date July 13 2001
import java.sql.*;
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
public class MyFrame extends JFrame
// Instance variables.
private JTextField id, firstNameText, lastNameText, courseNumberText, courseTitleText, profNameText, creditHoursText, gradeText;
private JLabel idLabel, firstNameLabel, lastNameLabel, courseNumberLabel, courseTitleLabel, profNameLabel, creditHoursLabel, gradeLabel, extraLabel;
private JButton first, next;
private JPanel panel;
private boolean atEOF;
String db;
Connection c;
Statement s;
ResultSet r;
MyListener a;
public MyFrame() throws SQLException,
ClassNotFoundException
super("Grades"); // Set caption in parent constructor.
setSize(600, 160); // Set the Size of the Panel.
// Initializing all the Text Feilds
id = new JTextField(25);
firstNameText = new JTextField(25);
lastNameText = new JTextField(25);
courseNumberText = new JTextField(25);
courseTitleText= new JTextField(25);
profNameText = new JTextField(25);
creditHoursText= new JTextField(25);
gradeText = new JTextField(25);
panel = new JPanel(new GridLayout(5, 4, 5, 5)); // Panel Layout is set to GridLayout
// Initializing the Buttons.
first = new JButton ("First Grade");
next = new JButton ("Next Grade");
atEOF = false;
// Initializing the Labels for the panel.
idLabel = new JLabel(" ID");
firstNameLabel = new JLabel(" First Name");
lastNameLabel = new JLabel(" Last Name");
courseNumberLabel = new JLabel(" Course Number");
courseTitleLabel = new JLabel(" Course Title");
profNameLabel = new JLabel(" Professor Name");
creditHoursLabel = new JLabel(" Credit Hours");
gradeLabel = new JLabel(" Grade");
extraLabel = new JLabel (" ");
// Add Contents to the Panel.
panel.add(id);
panel.add(firstNameText);
panel.add(lastNameText);
panel.add(courseNumberText);
panel.add(idLabel);
panel.add(firstNameLabel);
panel.add(lastNameLabel);
panel.add(courseNumberLabel);
panel.add(courseTitleText);
panel.add(profNameText);
panel.add(creditHoursText);
panel.add(gradeText);
panel.add(courseTitleLabel);
panel.add(profNameLabel);
panel.add(creditHoursLabel);
panel.add(gradeLabel);
panel.add(extraLabel);
panel.add(first);
panel.add(next);
// Set ContentPane.
setContentPane(panel);
// Initializing the ActionListener.
a = new MyListener();
first.addActionListener(a);
next.addActionListener(a);
// Set up database stuff.
Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
db = "jdbc:odbc:GradeData";
c = DriverManager.getConnection(db);
public class MyListener implements ActionListener
public void actionPerformed(ActionEvent event)
try
if (event.getSource() == first) // When the First Button is Pressed then Do the Following Code.
String str = "SELECT * FROM Grades WHERE ID = '" + id.getText()+ "'";
s = c.createStatement();
r = s.executeQuery(str);
if (atEOF = !r.next())
return;
else
// Setting the Feilds for the OutPut.
firstNameText.setText(r.getString(2));
lastNameText.setText(r.getString(3));
courseNumberText.setText(r.getString(4));
courseTitleText.setText(r.getString(5));
profNameText.setText(r.getString(6));
creditHoursText.setText(r.getString(7));
gradeText.setText(r.getString(8));
else // When the Next Button is Pressed then Do the Following Code.
if (!atEOF)
atEOF = !r.next();
if (!atEOF)
// id.setText(r.getString(1));
firstNameText.setText(r.getString(2));
lastNameText.setText(r.getString(3));
courseNumberText.setText(r.getString(4));
courseTitleText.setText(r.getString(5));
profNameText.setText(r.getString(6));
creditHoursText.setText(r.getString(7));
gradeText.setText(r.getString(8));
catch(SQLException e)
System.out.println("SQLException"); // SQL Exceptions.

Answer 1

Where are you getting the exception.
Is it the lines you commented out? If so and the id field is numeric try using getInt (or whatever) instead of getString