Please Help Me, Delete Method(any suggestions!!)

Question

Can anyone spare the time to look at the below three classes and suggest a method that goes into the customerList class and deletes a record from the Oracle DB they are sitting on top of.
For example when the deleteCust button is pressed on the form (customerForm) I would like it to delete the current customer (currentCustomer) that is displayed on the form at the time of the button click.
Can anyone please HELP me, it would be very much appreciated :-)
customer class
import java.util.*;
import java.sql.*;
public class Customer{
private int customer_id;
private String customer_name;
private String address1;
private String address2;
private String town;
private String county;
private String post_code;
private String country;
private String fax;
private String telephone;
private String contact_name;
private String email;
private boolean newCustomer;
//private JobList jobList;
public Customer(int c){
customer_id = c;
newCustomer = true;
public Customer(int inCustomer_id,String inCustomer_name,String inAddress1, String inAddress2, String inTown, String inCounty,String inPost_code,String inCountry,String inFax,String inTelephone,String inContact_name,String inEmail){
customer_id=inCustomer_id;
customer_name=inCustomer_name;
address1=inAddress1;
address2=inAddress2;
town=inTown;
county=inCounty;
post_code=inPost_code;
country=inCountry;
fax=inFax;
telephone=inTelephone;
contact_name=inContact_name;
email=inEmail;
newCustomer = false;
public String getAddress1(){
if (address1 == null)
return ("");
else
return address1;
public String getAddress2(){
if (address2 == null)
return ("");
else
return address2;
public String getCounty(){
if (county == null)
return ("");
else
return county;
public String getFax(){
if (fax == null)
return ("");
else
return fax;
public int getCustomer_id(){
if (customer_id == 0)
return (0);
else
return customer_id;
public String getCustomer_name(){
if (customer_name == null)
return ("");
else
return customer_name;
public String getTelephone(){
if (telephone == null)
return ("");
else
return telephone;
public String getPost_code(){
if (post_code == null)
return ("");
else
return post_code;
public String getTown(){
if (town == null)
return ("");
else
return town;
public String getCountry(){
if (country == null)
return ("");
else
return country;
public String getContact_name(){
if (contact_name == null)
return ("");
else
return contact_name;
public String getEmail(){
if (email == null)
return ("");
else
return email;
/*public JobList getJobList() throws SQLException {
// if the joblist object exists return it otherwise create it
if (jobList != null){
return jobList;
else{
return new JobList(this);
public boolean isNewCustomer(){
return newCustomer;
public void setAddress1(String inAddress1){
address1=inAddress1;
public void setAddress2(String inAddress2){
address2=inAddress2;
public void setCounty(String inCounty){
county=inCounty;
public void setFax(String inFax){
fax=inFax;
public void setCustomer_id(int inCustomer_id){
customer_id = inCustomer_id;
public void setCustomer_name(String inCustomer_name){
customer_name=inCustomer_name;
public void setTelephone(String inTelephone){
telephone=inTelephone;
public void setPost_code(String inPost_code){
post_code=inPost_code;
public void setTown(String inTown){
town=inTown;
public void setCountry(String inCountry){
country=inCountry;
public void setContact_name(String inContact_name){
contact_name=inContact_name;
public void setEmail(String inEmail){
email=inEmail;
customerList class
import java.sql.*;
import java.util.*;
public class CustomerList{
private ResultSet rs ;
private Connection con;
private Statement stmt;
public CustomerList () {
ConnectionManager man = ConnectionManager.getInstance();
con = man.getConnection();
public Customer getFirstCustomer()throws SQLException {
Customer firstCustomer;
stmt = con.createStatement(ResultSet.TYPE_SCROLL_SENSITIVE, ResultSet.CONCUR_READ_ONLY);
rs = stmt.executeQuery("select customer_id,customer_name,address1,address2,town,county,post_code,country,fax,telephone,contact_name,email from customer");
rs.next();
firstCustomer = loadCustomer();
return firstCustomer;
public Customer getLastCustomer() throws SQLException{
Customer lastCustomer;
rs.last();
lastCustomer = loadCustomer();
return lastCustomer;
public Customer getNextCustomer()throws SQLException{
Customer nextCustomer ;
if (rs.next()){
nextCustomer = loadCustomer();
else{
nextCustomer = null;
return nextCustomer;
public Customer getPreviousCustomer()throws SQLException{
Customer previousCustomer;
if (rs.previous()){
previousCustomer = loadCustomer();
else
previousCustomer = null;
return previousCustomer;
public Customer findCustomer(int inCustNum) throws SQLException{
Customer foundCust;
if (inCustNum==0){
foundCust = getFirstCustomer();
else{
stmt = con.createStatement(ResultSet.TYPE_SCROLL_SENSITIVE, ResultSet.CONCUR_READ_ONLY);
rs = stmt.executeQuery("select customer_id,customer_name,address1,address2,town,county,post_code,country,fax,telephone,contact_name,email from customer where customer_id = "+inCustNum);
if (rs.next()){
foundCust = loadCustomer();
else
foundCust = null;
return foundCust;
public Customer addCust()throws SQLException{
Statement stmt2 = con.createStatement();
ResultSet rsadd = stmt2.executeQuery("select custid.nextval from dual");
rsadd.next();
int id = rsadd.getInt("nextval");
rsadd.close();
stmt2.close();
Customer newCust = new Customer(id);
return newCust;
public Customer saveCustomer(Customer inSaveCust)throws SQLException{
Statement stmt3 = con.createStatement();
int rowNum;
//int incid = inSaveCust.getCid();
if (inSaveCust.isNewCustomer()){
stmt3.executeUpdate("insert into customer values ("
+inSaveCust.getCustomer_id()
+",'"+inSaveCust.getCustomer_name()
+"','"+inSaveCust.getAddress1()
+"','"+inSaveCust.getAddress2()
+"','"+ inSaveCust.getTown()
+"','"+ inSaveCust.getCounty()
+"','"+inSaveCust.getPost_code()
+"','"+inSaveCust.getCountry()
+"','"+inSaveCust.getFax()
+"','"+ inSaveCust.getTelephone()
+"','"+inSaveCust.getContact_name()
+"','"+inSaveCust.getEmail()+"')");
inSaveCust = getFirstCustomer();//refreshes list after insert
inSaveCust = getLastCustomer();// goes to the inserted record ie last one
else {
rowNum = rs.getRow();//traps the record number so can be returned to
stmt3.executeUpdate("update customer set customer_name = '"+inSaveCust.getCustomer_name()
+ "', address1 = '"+inSaveCust.getAddress1()
+ "', address2 = '"+inSaveCust.getAddress2()
+ "', town = '"+ inSaveCust.getTown()
+ "', county = '"+ inSaveCust.getCounty()
+ "', post_code = '"+inSaveCust.getPost_code()
+ "', telephone = '"+inSaveCust.getCountry()
+ "', fax = '"+inSaveCust.getFax()
+ "', country = '"+inSaveCust.getTelephone()
+ "', contact_name = '"+inSaveCust.getContact_name()
+ "', email = '"+inSaveCust.getEmail()
+"' where customer_id = "+inSaveCust.getCustomer_id());
inSaveCust = getFirstCustomer();
rs.absolute(rowNum); // points back to same record number as updated
inSaveCust = loadCustomer();
con.commit();
return inSaveCust;
//Trying to add in the delete method here(as u can see it is not working)
/*public Customer deleteCustomer() throws SQL Exception {
stmt = con.createStatement(ResultSet.TYPE_SCROLL_SENSITIVE, ResultSet.CONCUR_READ_ONLY);
rs = stmt4.executeQuery("delete from customer where customer_id = "Integer.parseInt(textCustomer_id.getText()));
rs.next();
firstCustomer = loadCustomer();
return firstCustomer;
public boolean isFirst() throws SQLException{
return rs.isFirst();
public boolean isLast() throws SQLException{
return rs.isLast();
public Customer loadCustomer ()throws SQLException{
Customer cust = new Customer(rs.getInt("customer_id"),rs.getString("customer_name"),rs.getString("address1"),
rs.getString("address2"),rs.getString("town"),rs.getString("county"),
rs.getString("post_code"),rs.getString("country"),rs.getString("fax"),
rs.getString("telephone"),rs.getString("contact_name"),rs.getString("email"));
return cust;
customerForm class
import javax.swing.*;
import javax.swing.border.*;
import java.awt.*;
import java.awt.event.*;
import java.sql.*;
import java.util.*;
public class CustomerForm extends JFrame implements ActionListener {
private Customer currentCustomer;
private CustomerList inCustomerList;
private JPanel panel;
private JTextField textCustomer_id,textCustomer_name,textAddress1,textAddress2,textTown,
textCounty,textPost_code,textCountry,textTelephone,textFax,textContact_name,textEmail,textFind;
private JButton nextCust, prevCust,firstCust,lastCust,newCust,
findCust,add,save,delete,jobs,close,deleteCust;
public CustomerForm(CustomerList inC)throws SQLException{
inCustomerList = inC;
currentCustomer = inCustomerList.getFirstCustomer();
displayForm();
displayFields();
setTextFields();
displayButtons();
getContentPane().add(panel);
setVisible(true);
public void displayForm() throws SQLException{
setTitle("Customer Form");
setSize(700,500);
// Center the frame
Dimension dim = getToolkit().getScreenSize();
setLocation(dim.width/2-getWidth()/2, dim.height/2-getHeight()/2);
getContentPane().setLayout(new BorderLayout());
Border etched = BorderFactory.createEtchedBorder();
panel = new JPanel();
panel.setLayout( null );
Border paneltitled = BorderFactory.createTitledBorder(etched,"");
panel.setBorder(paneltitled);
panel.setBackground(new Color(224,224,255));
public void displayFields() throws SQLException{
int x = 10;
int y = 50;
int textheight = 20;
int textwidth = 150;
int labelwidth = 110;
int ydist = textheight + 10;
int xdist = textwidth*2;
JLabel labelCustomer_id = new JLabel("Customer Number:");
labelCustomer_id.setBounds( x, y, labelwidth, textheight);
panel.add(labelCustomer_id);
JLabel labelCustomer_name = new JLabel("Customer Name:");
labelCustomer_name.setBounds(xdist, y, labelwidth, textheight);
panel.add(labelCustomer_name);
JLabel labelAddress1 = new JLabel("Address 1:");
labelAddress1.setBounds( x, y+ydist, labelwidth, textheight);
panel.add(labelAddress1);
JLabel labelAddress2 = new JLabel("Address 2:");
labelAddress2.setBounds( xdist, y+ydist, labelwidth, textheight);
panel.add(labelAddress2);
JLabel labelTown = new JLabel("Town:");
labelTown.setBounds(x, y+ydist*2, labelwidth, textheight);
panel.add(labelTown);
JLabel labelCounty = new JLabel("County:");
labelCounty.setBounds(xdist, y+ydist*2, labelwidth, textheight);
panel.add(labelCounty);
JLabel labelPost_code = new JLabel("Post Code:");
labelPost_code.setBounds(x, y+ydist*3, labelwidth, textheight);
panel.add(labelPost_code);
JLabel labelCountry = new JLabel("Country:");
labelCountry.setBounds(xdist, y+ydist*3, labelwidth, textheight);
panel.add(labelCountry);
JLabel labelTelephone = new JLabel("Phone:");
labelTelephone.setBounds(x, y+ydist*4, labelwidth, textheight);
panel.add(labelTelephone);
JLabel labelFax = new JLabel("Fax:");
labelFax.setBounds(xdist, y+ydist*4, labelwidth, textheight);
panel.add(labelFax);
JLabel labelContact_name = new JLabel("Contact Name:");
labelContact_name.setBounds(x, y+ydist*5, labelwidth, textheight);
panel.add(labelContact_name);
JLabel labelEmail = new JLabel("E-mail address:");
labelEmail.setBounds(xdist, y+ydist*5, labelwidth, textheight);
panel.add(labelEmail);
JLabel labelFind = new JLabel("Customer Number Search:");
labelFind.setBounds( 40, 360, 200, textheight);
panel.add(labelFind);
textAddress1 = new JTextField();
textAddress1.setBounds(x+labelwidth, y+ydist, textwidth, textheight);
panel.add(textAddress1);
textAddress2 = new JTextField();
textAddress2.setBounds(xdist+labelwidth, y+ydist, textwidth, textheight);
panel.add(textAddress2);
textTown = new JTextField();
textTown.setBounds(x+labelwidth, y+ydist*2, textwidth, textheight);
panel.add(textTown);
textCounty = new JTextField();
textCounty.setBounds(xdist+labelwidth, y+ydist*2, textwidth, textheight);
panel.add(textCounty);
textPost_code = new JTextField();
textPost_code.setBounds(x+labelwidth, y+ydist*3, textwidth, textheight);
panel.add(textPost_code);
textCountry = new JTextField();
textCountry.setBounds(xdist+labelwidth, y+ydist*3, textwidth, textheight);
panel.add(textCountry);
textTelephone = new JTextField();
textTelephone.setBounds(x+labelwidth, y+ydist*4, textwidth, textheight);
panel.add(textTelephone);
textFax = new JTextField();
textFax.setBounds(xdist+labelwidth, y+ydist*4, textwidth, textheight);
panel.add(textFax);
textContact_name = new JTextField();
textContact_name.setBounds(x+labelwidth, y+ydist*5, textwidth, textheight);
panel.add(textContact_name);
textEmail = new JTextField();
textEmail.setBounds(xdist+labelwidth, y+ydist*5, textwidth+50, textheight);
panel.add(textEmail);
textFind = new JTextField();
textFind.setBounds(200, 360, 80, textheight);
panel.add(textFind);
textCustomer_id = new JTextField();
textCustomer_id.setBounds(x+labelwidth, y, textwidth, textheight);
panel.add(textCustomer_id);
textCustomer_name = new JTextField();
textCustomer_name.setBounds(xdist+labelwidth, y, textwidth+50, textheight);
panel.add(textCustomer_name);
public boolean delete() {
textCustomer_id.setText("");
textCustomer_name.setText("");
textAddress1.setText("");
textAddress2.setText("");
textTown.setText("");
textCounty.setText("");
textPost_code.setText("");
textCountry.setText("");
textTelephone.setText("");
textFax.setText("");
textContact_name.setText("");
textEmail.setText("");
textFind.setText("");
return true;
public void displayButtons(){
firstCust= new JButton("FIRST");
firstCust.addActionListener(this);
firstCust.setBounds(50, 430, 100, 20 );
panel.add( firstCust );
nextCust = new JButton("NEXT");
nextCust.addActionListener(this);
nextCust.setBounds(150, 430, 100, 20 );
panel.add( nextCust );
prevCust = new JButton("PREVIOUS");
prevCust.addActionListener(this);
prevCust.setBounds(250, 430, 100, 20 );
panel.add( prevCust );
lastCust= new JButton("LAST");
lastCust.addActionListener(this);
lastCust.setBounds(350, 430, 100, 20 );
panel.add( lastCust );
findCust= new JButton("FIND");
findCust.addActionListener(this);
findCust.setBounds(350, 360, 100, 20 );
panel.add( findCust );
add = new JButton("ADD");
add.addActionListener(this);
add.setBounds(150, 400, 100, 20 );
panel.add( add );
save = new JButton("SAVE");
save.addActionListener(this);
save.setBounds(250, 400, 100, 20 );
panel.add( save );
jobs = new JButton("JOBS");
jobs.addActionListener(this);
jobs.setBounds(550, 360, 100, 20 );
panel.add( jobs );
close = new JButton("CLOSE");
close.addActionListener(this);
close.setBounds(550, 430, 100, 20 );
panel.add( close );
delete = new JButton("DELETE");
delete.addActionListener(this);
delete.setBounds(350, 400, 100, 20 );
panel.add( delete );
deleteCust = new JButton("DELETECUST");
deleteCust.addActionListener(this);
deleteCust.setBounds(450, 400, 100, 20);
panel.add( deleteCust );
public void getTextFields(){
currentCustomer.setCustomer_id(Integer.parseInt(textCustomer_id.getText()));
currentCustomer.setCustomer_name(textCustomer_name.getText());
currentCustomer.setAddress1(textAddress1.getText());
currentCustomer.setAddress2(textAddress2.getText());
currentCustomer.setTown(textTown.getText());
currentCustomer.setCounty(textCounty.getText());
currentCustomer.setPost_code(textPost_code.getText());
currentCustomer.setCountry(textCountry.getText());
currentCustomer.setFax(textFax.getText());
currentCustomer.setTelephone(textTelephone.getText());
currentCustomer.setContact_name(textContact_name.getText());
currentCustomer.setEmail(textEmail.getText());
public void setTextFields() throws SQLException{
textCustomer_id.setText(String.valueOf(currentCustomer.getCustomer_id()));
textCustomer_id.setEditable(false);
textCustomer_name.setText(currentCustomer.getCustomer_name());
textAddress1.setText(currentCustomer.getAddress1());
textAddress2.setText(currentCustomer.getAddress2());
textTown.setText(currentCustomer.getTown());
textCounty.setText(currentCustomer.getCounty());
textPost_code.setText(currentCustomer.getPost_code());
textCountry.setText(currentCustomer.getCountry());
textFax.setText(currentCustomer.getFax());
textTelephone.setText(currentCustomer.getTelephone());
textContact_name.setText(currentCustomer.getContact_name());
textEmail.setText(currentCustomer.getEmail());
public void actionPerformed(ActionEvent e) {
Object source = e.getSource();
try {
if (source == nextCust)
currentCustomer = inCustomerList.getNextCustomer();
else if (source == prevCust)
currentCustomer = inCustomerList.getPreviousCustomer();
else if (source == findCust) {
try {
currentCustomer =
inCustomerList.findCustomer(Integer.parseInt(textFind.getText()));
catch (NumberFormatException ex) {
JOptionPane.showMessageDialog(
null, "Invalid Customer number", "ERROR",
JOptionPane.ERROR_MESSAGE);
if (currentCustomer == null) {
JOptionPane.showMessageDialog(null, "Customer not found");
currentCustomer = inCustomerList.getFirstCustomer();
textFind.setText(null);
else if (source == firstCust)
currentCustomer = inCustomerList.getFirstCustomer();
else if (source == lastCust)
currentCustomer = inCustomerList.getLastCustomer();
else if (source == add) {
currentCustomer = inCustomerList.addCust();
add.setEnabled(false);
else if (source == delete) {
delete();
else if (source == save) {
add.setEnabled(true);
getTextFields();
currentCustomer = inCustomerList.saveCustomer(currentCustomer);
//else if (source == jobs) {
// JFrame newJobForm = new JobForm(currentCustomer.getJobList());
//else if (source == deleteCust) {
//........... //currentCustomer = inCustomerList.deleteCustomer(currentCustomer);
else if (source == close) {
dispose();
setTextFields();
nextCust.setEnabled(!inCustomerList.isLast());
prevCust.setEnabled(!inCustomerList.isFirst());
firstCust.setEnabled(!inCustomerList.isFirst());
lastCust.setEnabled(!inCustomerList.isLast());
catch (SQLException ex) {
System.out.println("Failed");
System.out.println(ex.getMessage());
ex.printStackTrace();
System.exit(-1);
PLEASE HELP ME!!!

Answer 1

http://www.ss64.demon.co.uk/orasyntax/