You haven't clarified your query properly. Anyways, here is an example of inserting the id value into the database according to the name selected from the drop down.

import java.sql.*;
import java.awt.*;
import java.util.*;
import javax.swing.*;
import java.awt.event.*;
class ComboBox{

    public static void main(String[] args) throws Exception{
        JFrame f=new JFrame();
        f.setLayout(null);
        JLabel lab=new JLabel("Select Name:");
        final JComboBox combo=new JComboBox();
        combo.addItem("George");
        combo.addItem("Maria");
        combo.addItem("John");
        combo.addItem("Jennifer");
        combo.addItem("Kate");

        ActionListener actionListener = new ActionListener(){
        public void actionPerformed(ActionEvent actionEvent) {
        ItemSelectable is = (ItemSelectable)actionEvent.getSource();
        String name=selectedString(is);
        try{
        Class.forName("com.mysql.jdbc.Driver").newInstance();
        Connection conn = DriverManager.getConnection("jdbc:mysql://localhost:3306/test", "root", "root" );
        Statement st=conn.createStatement();
        st.executeUpdate("update data1 set id=60 where name='"+name+"'");
        System.out.println("Inserted");
        }
        catch(Exception E){}
        }
       };
       combo.addActionListener(actionListener);
       combo.setEditable(true);
       lab.setBounds(20,20,100,20);
       combo.setBounds(120,20,80,20);
       f.add(lab);
       f.add(combo);
       f.setVisible(true);
       f.setSize(300,120);
    }
    static private String selectedString(ItemSelectable is) {
    Object selected[] = is.getSelectedObjects();
    return ((selected.length == 0) ? "null" : (String)selected[0]);
  } 
}

Here is another example that simply insert the selected combobox value and id into the database.

import java.sql.*;
import java.awt.*;
import java.util.*;
import javax.swing.*;
import java.awt.event.*;
class ComboBox{

    public static void main(String[] args) throws Exception{
        JFrame f=new JFrame();
        f.setLayout(null);
        JLabel lab=new JLabel("Select Name:");
        final JComboBox combo=new JComboBox();
        combo.addItem("George");
        combo.addItem("Maria");
        combo.addItem("John");
        combo.addItem("Jennifer");
        combo.addItem("Kate");

        ActionListener actionListener = new ActionListener(){
        public void actionPerformed(ActionEvent actionEvent) {
        ItemSelectable is = (ItemSelectable)actionEvent.getSource();
        String name=selectedString(is);
        System.out.println(name);
        try{
        Class.forName("com.mysql.jdbc.Driver").newInstance();
        Connection conn = DriverManager.getConnection("jdbc:mysql://localhost:3306/test", "root", "root" );
        Statement st=conn.createStatement();


        st.executeUpdate("insert into data1(id,name) values(60,'"+name+"')");
        System.out.println("Inserted");
        }
        catch(Exception e){
        System.out.println(e);
        }
        }
       };
       combo.addActionListener(actionListener);
       lab.setBounds(20,20,100,20);
       combo.setBounds(120,20,80,20);
       f.add(lab);
       f.add(combo);
       f.setVisible(true);
       f.setSize(300,120);
    }
    static private String selectedString(ItemSelectable is) {
    Object selected[] = is.getSelectedObjects();
    return ((selected.length == 0) ? "null" : (String)selected[0]);
  } 
}