Adding checkbox column to JScrollPane

What I basically want to do is adding a column of checkboxes in my table which is responsible for showing the contents of my database. And then I am planning to open up as many JFrames as there are checked-boxes when user clicks on the "Update..." button, and delete the rows corresponding to ones with checked-boxes when user hits "Delete".

interface I am planning to implement

package dbInterface;

import java.awt.BorderLayout;
import java.awt.event.*;
import java.sql.*;
import javax.swing.*;
import java.util.*;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.swing.table.*;


public class Interface {


    public Interface(Connection myConn) throws SQLException {
        intFrame=new JFrame();
        intFrame.setTitle("DBInterface");
        intFrame.setLayout(null);
        intFrame.setVisible(true);
        intFrame.setSize(600, 450);
        intFrame.setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);

        showDB(myConn);

        insertButton=new JButton("Add...");      
        insertButton.setBounds(85, 300, 85, 25);
        insertButton.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent evt) {
                try {
                    insertToDB(myConn);
                } catch (SQLException ex) {
                    Logger.getLogger(Interface.class.getName()).log(Level.SEVERE, null, ex);
                }
            }           
        });

        deleteButton=new JButton("Delete");      
        deleteButton.setBounds(255, 300, 85, 25);
        deleteButton.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent evt) {
                try {
                    delFromDB(myConn);
                } catch (SQLException ex) {
                    Logger.getLogger(Interface.class.getName()).log(Level.SEVERE, null, ex);
                }
            }           
        });

        updateButton=new JButton("Update...");      
        updateButton.setBounds(425, 300, 85, 25);
        updateButton.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent evt) {
                try {
                    updateDB(myConn);
                } catch (SQLException ex) {
                    Logger.getLogger(Interface.class.getName()).log(Level.SEVERE, null, ex);
                }
            }           
        });

        intFrame.add(updateButton);
        intFrame.add(insertButton);
        intFrame.add(deleteButton);
    }

    private void updateDB(Connection myConn) throws SQLException {

    }

    private void delFromDB(Connection myConn) throws SQLException {

    }

    private void showDB(Connection myConn) throws SQLException {
        dataTable=new JTable();        
        Vector<Object> data = new Vector<Object>();
        Vector<Object> columnNames=new Vector<Object>();

        Statement showStmt=myConn.createStatement();
        ResultSet rs=showStmt.executeQuery("select * from employees");
        ResultSetMetaData md = rs.getMetaData();
        int columns = md.getColumnCount();

        for (int i = 1; i <= columns; i++) 
            columnNames.addElement(md.getColumnName(i));       

        while(rs.next()) {
            Vector<Object> row = new Vector<Object>(6);

            for(int i=1;i<=6;i++)
                row.addElement(rs.getObject(i));

            data.addElement(row);           
        }

        rs.close();
        showStmt.close();

        DefaultTableModel model = new DefaultTableModel(data, columnNames) {            
            @Override
            public Class getColumnClass(int column) {
                for (int row = 0; row < getRowCount(); row++) {
                    Object o = getValueAt(row, column);
                    if (o != null)
                        return o.getClass();                    
                }

                return Object.class;
            }
        };

        dataTable=new JTable(model);
        scrollPane = new JScrollPane(dataTable);
        scrollPane.setBounds(50, 20, 500, 200);
        intFrame.add(scrollPane);
    }   

    private void insertToDB(Connection myConn) throws SQLException {   
        insertForm=new JFrame();
        insertForm.setTitle("Add");
        insertForm.setLayout(null);
        insertForm.setVisible(true);
        insertForm.setSize(600, 450);

        JLabel name=new JLabel("Name:");
        name.setBounds(100,100,50,25);
        JLabel surname=new JLabel("Surname:");        
        surname.setBounds(100,150,50,25);
        JLabel email=new JLabel("E-Mail:");        
        email.setBounds(100,200,50,25);
        JLabel dept=new JLabel("Department:");        
        dept.setBounds(100,250,50,25);
        JLabel salary=new JLabel("Salary:");
        salary.setBounds(100,300,50,25);

        JTextField nameT=new JTextField();
        nameT.setBounds(200,100,100,25);
        JTextField surnameT=new JTextField();
        surnameT.setBounds(200,150,100,25);
        JTextField emailT=new JTextField();
        emailT.setBounds(200,200,100,25);
        JTextField deptT=new JTextField();
        deptT.setBounds(200,250,100,25);
        JTextField salaryT=new JTextField();
        salaryT.setBounds(200,300,100,25);

        JButton insert=new JButton("Add");
        insert.setBounds(400,400,50,25);
        insert.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent evt) {
                try {
                    PreparedStatement insStmt=myConn.prepareStatement("insert into employees" +
                            "(last_name, first_name, email, department, salary)"  +
                            "values" +
                            "(?, ?, ?, ?, ?)");

                    insStmt.setString(1, surnameT.getText());
                    insStmt.setString(2, nameT.getText());
                    insStmt.setString(3, emailT.getText());
                    insStmt.setString(4, deptT.getText());
                    insStmt.setInt(5, Integer.parseInt(salaryT.getText()));

                    insStmt.executeUpdate();
                    insertForm.dispose();

                    intFrame.remove(scrollPane);
                    showDB(myConn);
                } catch (SQLException ex) {
                    Logger.getLogger(Interface.class.getName()).log(Level.SEVERE, null, ex);
                }
            }           
        });

        insertForm.add(name);
        insertForm.add(surname);
        insertForm.add(email);
        insertForm.add(dept);
        insertForm.add(salary);

        insertForm.add(nameT);
        insertForm.add(surnameT);
        insertForm.add(emailT);
        insertForm.add(deptT);
        insertForm.add(salaryT);

        insertForm.add(insert);          
    }

    private JFrame intFrame,rowsFrame,insertForm;
    private JButton showButton, insertButton, deleteButton, updateButton;
    private JTable dataTable;   
    private JScrollPane scrollPane;    

}