Jdbc abstract Jtable model problem

Question

Hi,
I am trying to write a program that displays the content of a database in a jtable.
So far the displaying is working, but Im having trouble with adding, deleting and modifying the jtable.
Im working on the add method first. Its supposed to add a blank row, but it just adds the last row instead.
Heres the source:
// new class. This is the table model
import javax.swing.table.*;
import java.sql.*;
import java.util.Vector;
import javax.swing.JTable;
public class MyTableModel extends AbstractTableModel {
Connection con;
Statement stat;
ResultSet rs;
int li_cols = 0;
Vector allRows;
Vector row;
Vector newRow;
Vector blankRow;
Vector colNames;
String dbColNames[];
String pkValues[];
String tableName;
ResultSetMetaData myM;
String pKeyCol;
Vector deletedKeys;
Vector newRows;
boolean ibRowNew = false;
boolean ibRowInserted = false;
MyTableModel(){
try{
Class.forName("com.mysql.jdbc.Driver");
catch (ClassNotFoundException e){
System.out.println("Cannot Load Driver!");
try{
String url = "jdbc:mysql://localhost:3306/aubrey?";
con = DriverManager.getConnection(url,"Dude1", "supersecret");
stat = con.createStatement();
rs = stat.executeQuery("SELECT * from COFFEES");
deletedKeys = new Vector();
newRows = new Vector();
myM = rs.getMetaData();
tableName = myM.getTableName(1);
li_cols = myM.getColumnCount();
dbColNames = new String[li_cols];
for(int col = 0; col < li_cols; col ++){
dbColNames[col] = myM.getColumnName(col + 1);
allRows = new Vector();
while(rs.next()){
newRow = new Vector();
for(int i = 1; i <= li_cols; i++){
newRow.addElement(rs.getObject(i));
} // for
allRows.addElement(newRow);
} // while
catch(SQLException e){
System.out.println(e.getMessage());
public Class getColumnClass(int col){
return getValueAt(0,col).getClass();
public boolean isCellEditable(int row, int col){
if (ibRowNew){
return true;
if (col == 0){
return false;
} else {
return true;
public String getColumnName(int col){
return dbColNames[col];
public int getRowCount(){
return allRows.size();
public int getColumnCount(){
return li_cols;
public Object getValueAt(int arow, int col){
row = (Vector) allRows.elementAt(arow);
return row.elementAt(col);
public void setValueAt(Object aValue, int aRow, int aCol) {
Vector dataRow = (Vector) allRows.elementAt(aRow);
dataRow.setElementAt(aValue, aCol);
fireTableCellUpdated(aRow, aCol);
public void updateDB(){}
public void addRow(){
     newRow.addElement(blankRow);
     int rowNumber = allRows.size();
     allRows.addElement(newRow);
     ibRowNew = true;
     this.isCellEditable(allRows.size(),0);
     System.out.println(allRows.size());
     fireTableRowsInserted(rowNumber,rowNumber);
public void deleteRow(int i){}
}And here is the code for the GUI:
import javax.swing.*;
import java.awt.event.*;
import java.awt.*;
import javax.swing.event.*;
import javax.swing.table.*;
public class MyTableApp extends JFrame{
JTable myTable;
JButton update;
JButton insert;
JButton delete;
JPanel p;
MyTableModel tm;
JScrollPane myPane;
MyTableApp(){
try{
UIManager.setLookAndFeel("com.sun.java.swing.plaf.windows.WindowsLookAndFeel");
catch(Exception e){
System.out.println("Error on look and feel");
update = new JButton("Update");
insert = new JButton("Add");
delete = new JButton("Delete");
p = new JPanel();
tm = new MyTableModel();
myTable = new JTable(tm);
myPane = new JScrollPane(myTable,
JScrollPane.VERTICAL_SCROLLBAR_AS_NEEDED,
JScrollPane.HORIZONTAL_SCROLLBAR_AS_NEEDED);
myTable.setSelectionForeground(Color.white);
myTable.setSelectionBackground(Color.red);
myTable.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);
p.add(myPane);
p.add(update);
p.add(insert);
p.add(delete);
update.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent e){
tm.updateDB();
insert.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent e){
tm.addRow();
myTable.setEditingRow(tm.getRowCount());
myTable.setRowSelectionInterval(tm.getRowCount()-1,tm.getRowCount()-1);
delete.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent e){
int rowToDelete = myTable.getSelectedRow();
tm.deleteRow(rowToDelete);
myTable.setEditingRow(rowToDelete -1);
myTable.setRowSelectionInterval(rowToDelete -1,rowToDelete -1);
this.addWindowListener(new WindowAdapter(){
public void windowClosing(WindowEvent e){
System.exit(0);
}); // end windowlistener
this.setContentPane(p);
this.setVisible(true);
this.pack();
} // constructor
public static void main (String args[]){
new MyTableApp();
} // main
} //class

Answer 1

When adding a row to a JTable, one should manipulate the table model. There are many examples of this on the web. Google is your friend.
Good luck.
Filestream