Swings and JDBC

Hi.. I am vinay.. I am developing a small application using swings and mysql. I am sending part of the code here..

The problem is i need to update the mysql fields with values which are gettin from dynamiclly created JTextfields... but i am not getting how i can fetch those particular values and update database with those value.....

Please help me..

My work is paused here... please

Here the code....

package kp;

import java.awt.*; import java.util.regex.*;

import java.awt.event.*;

import javax.swing.*;

import java.io.*; import java.net.*; import java.util.*; import java.sql.*; import java.lang.*; public class attend extends JFrame{

private JLabel jLabel1;
private JButton jButton1;
private JTextField jTextField2;
private JPanel contentPane;
private JTextField jTextField1;
final Vector columnNames = new Vector();
final Vector data = new Vector();
Vector row;
final Object g=new Vector();

public attend()
{
        super();

    initializeComponent();

    this.setVisible(true);
}

private void initializeComponent()
{
    jLabel1 = new JLabel();
    jButton1 = new JButton();
    jTextField1 = new JTextField(20);
    //jTextField1.setName("att");
    contentPane = (JPanel)this.getContentPane();
    contentPane.setBackground(Color.pink);
    jLabel1.setText("ATTENDANCE");


    jButton1.setText("Submit");


    try{
        Connection con = null;
        Class.forName("com.mysql.jdbc.Driver");
        con = DriverManager.getConnection("jdbc:mysql://localhost/vinay", "root", "admin");
        Statement st = con.createStatement();
        ResultSet rs= st.executeQuery("Select * from student");
        ResultSetMetaData md = rs.getMetaData();
        int columns = md.getColumnCount();
        for (int i = 1; i <= columns; i++) 
        {
        columnNames.addElement( md.getColumnName(i) );
        }
        while (rs.next()) {
        row = new Vector(columns);
        for (int i = 1; i <= columns; i++) 
        {
            row.addElement( rs.getObject(i));
            if(i==4)
            {
                row.addElement(jTextField1);
            }

        }
        data.addElement( row );
        //

        }
        String k=jTextField1.getText();
        System.out.println(k);
        rs.close();
        st.close();
        }
        catch(Exception e) {}
        JTable table = new JTable(data, columnNames);
        JScrollPane scrollPane = new JScrollPane( table );
    contentPane.setLayout(null);
    addComponent(contentPane, scrollPane, 5,110,200,200);
addComponent(contentPane, jLabel1, 50,1,345,37);
addComponent(contentPane, jButton1, 220,300,100,28);
this.setTitle("Class Attendance");
this.setLocation(new Point(66, 48));
this.setSize(new Dimension(438, 384));

jButton1.addActionListener(new ActionListener() {
    public void actionPerformed(ActionEvent e)
    {
        Vector z=new Vector();
        //System.out.println(data.get(2));
        //System.out.println(row.elementAt(3));
            //g=data.get(4);
            //System.out.println(g);
        try{
            int i;
            String sql=null;
            Connection con = null;
            //ResultSet rs=null;
            Class.forName("com.mysql.jdbc.Driver");
            con = DriverManager.getConnection("jdbc:mysql://localhost/vinay", "root", "admin");
            if(con!=null)
            {
            System.out.println("connectin established");
            }
            Statement st = con.createStatement();
            for(i=3;i>0;i-=3)
            {
                System.out.println(row.get(i));
                 String a=(String) row.get(i);
                Pattern p=Pattern.compile("^p");
                Matcher m=p.matcher(a);
                if(m.find())
                {
            sql="update student set attend='"+a+"'";
            System.out.println(sql);
            st.executeUpdate(sql);
                }
            }

            st.close();
            con.close();
            }
            catch(Exception e1) {}
        }


});
}

private void addComponent(Container container,Component c,int x,int y,int width,int height)
{
    c.setBounds(x,y,width,height);
    container.add(c);
}

}