Allowing user to modify/edit a JTable

Question

i'm new to java and i'm creating a JTable that allows a user to modify the data and the data will be stored in the database that i have created here is my code:
import javax.swing.JTable;
import javax.swing.JScrollPane;
import javax.swing.JPanel;
import javax.swing.JFrame;
import java.awt.*;
import java.awt.event.*;
import java.sql.*;
import java.util.*;
import javax.swing.event.*;
import javax.swing.table.TableModel;
public class SelectContacts extends JFrame implements TableModelListener {
private boolean DEBUG = true;
DataBase db = new DataBase();
Connection connection = db.getConnection();
public SelectContacts() {
super("SelectContacts");
DataBase db = new DataBase();
Connection connection = db.getConnection();
ArrayList contactsList =new ArrayList();
String[] columnNames = {"Name",
"Address",
"Gender",
"Email",
"Contact",
"Age"};
String query;
Statement statement;
ResultSet rs;
String personName="";
String address="";
String gender="";
String email="";
String contact="";
String age="";
Contacts s1;
int i=0;
query = "SELECT * FROM Contacts";
try{
statement = connection.createStatement();
rs = statement.executeQuery(query);
while (rs.next()){
     personName = rs.getString("Name");
address = rs.getString("Address");
gender = rs.getString("Gender");
email = rs.getString("Email");
contact = rs.getString("Contact");
age = rs.getString("Age");
s1= new Contacts(personName,address,gender,email,contact,age);
contactsList.add(s1);
i++;      
statement.close();
catch ( SQLException sqlex ) {
sqlex.printStackTrace();
Object[][] data = new Object[6];
int count=0;
while (count<i){
     s1 = (Contacts) contactsList.get(count);
     System.out.println("Name:" + s1.getName());
     System.out.println("Address:" + s1.getAddress());
     System.out.println("Gender:" + s1.getGender());
     System.out.println("Email:" + s1.getEmail());
     System.out.println("Contact No.:" + s1.getContact());
     System.out.println("Age:" + s1.getAge());
     data[count][0] = s1.getName();
     data[count][1] = s1.getAddress();
     data[count][2] = s1.getGender();
     data[count][3] = s1.getEmail();
               data[count][4] = s1.getContact();
               data[count][5] = s1.getAge();
count++;
final JTable table = new JTable(data, columnNames);
table.setPreferredScrollableViewportSize(new Dimension(500, 70));
table.getModel().addTableModelListener(this);
//Create the scroll pane and add the table to it.
JScrollPane scrollPane = new JScrollPane(table);
//Add the scroll pane to this window.
getContentPane().add(scrollPane, BorderLayout.CENTER);
highlighed
public void tableChanged(TableModelEvent e) {
int row = e.getFirstRow();
int column = e.getColumn();
TableModel model = (TableModel)e.getSource();
String columnName = model.getColumnName(column);
Object data = model.getValueAt(row, column);
Statement statement;
ResultSet rs;
     String insertString= "Insert into Contacts (Name, Address, Gender, Email, Contact, Age ) "+
          " VALUES ( '"+ data +"')";
          // Do something with the data...
try{
statement = connection.createStatement();
statement.executeUpdate(insertString);
statement.close();
catch ( SQLException sqlex ) {
sqlex.printStackTrace();
     System.out.println("You sucessfully modified! :)");          
highlighted
public static void main(String[] args) {
SelectContacts frame = new SelectContacts();
frame.addWindowListener(new WindowAdapter() {
public void windowClosing(WindowEvent e) {
System.exit(0);
//Whenever window gets the focus, let the
//TextFieldDemo set the initial focus.
public void windowActivated(WindowEvent e) {
// demo.setFocus();
frame.pack();
frame.setVisible(true);
i recieved error when i tried to edit 1 of the data "java.sql.SQLException: [Microsoft][ODBC Microsoft Access Driver] Number of query values and destination fields are not the same. i think the problem lies in the highlighted part. pls guide me thanks

Answer 1

i think the problem lies in the highlighted part. pls guide me thanks What highlighted part? When you post code use the [code ]...[code ] tags. Read the "Formatting Help" link when you post a question for more information.
I find it easier to use a PreparedStatement as it delimits a the parameters in your SQL statement for you. Here's a simple example, read the API for more information:
        private static void addData(Connection connection)
            throws Exception
            String sql =
                "INSERT INTO Page " +
                     "(Name," +
                     "Title) " +
                 "VALUES " +
            PreparedStatement stmt = connection.prepareStatement(sql);
            stmt.setString( 1, "Name1" );
            stmt.setString( 2, "Title1" );
            stmt.executeUpdate();
            stmt.setString( 1, "Name2" );
            stmt.setString( 2, "Title2" );
            stmt.executeUpdate();
            stmt.close();