refresh Jtable

Hello there,

I have a JTable with database records in it.when i add a new record i want to reload the table dynamically to show the new record,instead of closing and opening the frame again to show the new record.

these are the class and methods that is responsible for the jtable
this is the constr of the class where the table is

public TreeTableInternalFrame(final PictMenuFrameDemo frame)
    {
        super("InternalFrame",
              true, //resizable
              true, //closable
              true, //maximizable
              true);//iconifiable

        Dimension deskSize = frame.getDesktop().getSize();
        setSize((int)deskSize.getWidth() - 20, (int)deskSize.getHeight() - 20);
        //Set the window's location.
        setLocation(10, 10);
        JFParentFrame = frame;
        //get database result in to collections
        initCollections(frame.getDBConnection());
       
        testIcon = new ImageIcon(Toolkit.getDefaultToolkit().createImage("images/dslamIcon.png"));
       
         cityIcon = new ImageIcon(Toolkit.getDefaultToolkit().createImage("images/cityIcon.png"));
         coIcon =  new ImageIcon(Toolkit.getDefaultToolkit().createImage("images/coIcon.png"));
         dslamIcon =  new ImageIcon(Toolkit.getDefaultToolkit().createImage("images/dslamIcon.png"));
         linecardIcon =  new ImageIcon(Toolkit.getDefaultToolkit().createImage("images/cardIcon.png"));

       
        //set layout for frame content panel
        Container cp = getContentPane();
        cp.setLayout(new BorderLayout());
       
        //create toolbar
        JToolBar toolbar = createToolbar();
        cp.add(toolbar, BorderLayout.NORTH);

        // create popup menu for tree
        //treePopupMenu = createPopupMenuDslam();
       
        // create tree element
        createAndInitTree();
             
        JScrollPane jsp = new JScrollPane(tree, JScrollPane.VERTICAL_SCROLLBAR_AS_NEEDED,
                  JScrollPane.HORIZONTAL_SCROLLBAR_NEVER);
       
       
        //create tab panel
        tabPane = new JTabbedPane();
       
        cityPane = new JPanel(new BorderLayout());
       
        createCityTable();

        jspCity = new JScrollPane(cityTable, JScrollPane.VERTICAL_SCROLLBAR_AS_NEEDED,
                  JScrollPane.HORIZONTAL_SCROLLBAR_NEVER);
        cityPane.add(jspCity, BorderLayout.CENTER);
        tabPane.addTab("  City  ", cityIcon, cityPane);
       
        JPanel coPane = new JPanel(new BorderLayout());
        createCoTable();
        JScrollPane jspCo = new JScrollPane(coTable, JScrollPane.VERTICAL_SCROLLBAR_AS_NEEDED,
                  JScrollPane.HORIZONTAL_SCROLLBAR_NEVER);
        coPane.add(jspCo, BorderLayout.CENTER);
        tabPane.addTab("   Co   ", coIcon, coPane);
       
        JPanel dslamPane = new JPanel(new BorderLayout());
        createDslamTable();
        JScrollPane jspDslam = new JScrollPane(dslamTable, JScrollPane.VERTICAL_SCROLLBAR_AS_NEEDED,
                  JScrollPane.HORIZONTAL_SCROLLBAR_NEVER);
        dslamPane.add(jspDslam, BorderLayout.CENTER);
        tabPane.addTab("  Dslam  ", dslamIcon, dslamPane);
       
       
        JPanel linecardPane = new JPanel(new BorderLayout());
        createlinecardTable();
        JScrollPane jspLinecard = new JScrollPane(linecardTable, JScrollPane.VERTICAL_SCROLLBAR_AS_NEEDED,
                  JScrollPane.HORIZONTAL_SCROLLBAR_NEVER);
        linecardPane.add(jspLinecard, BorderLayout.CENTER);
        tabPane.addTab("  Linecard  ", linecardIcon, linecardPane);
               
        splitPane = new JSplitPane(JSplitPane.HORIZONTAL_SPLIT, jsp, tabPane);
        cp.add(splitPane, BorderLayout.CENTER);
       
        addInternalFrameListener(new InternalFrameAdapter() {
             public void internalFrameClosing(InternalFrameEvent ife) {
                  frame.setInnerFrameNull();  
             }
        });
    }

and this is the method in the above class which is called in another class when i enter new data to be saved in db

public void reloadRecord()
    {
         initCollections(JFParentFrame.getDBConnection());
         //javax.swing.JOptionPane.showMessageDialog(null, "Called");
         createCityTable();
         cityPane.revalidate();
         cityPane.repaint();
    }


and this is the method which is called the first time in the constr of the above class and the second time it is called in the reloadRecord method

private void createCityTable()
    {
         System.out.println("Inside createCityTable() ");
         if (cityTable==null)
         {
            String[] columnNames = {"City ID",
                       "City Farsi Name",
                       "City English Name",
                       "Prefix"};
            model = new DefaultTableModel(columnNames, 0);
           
            for (int i = 0; i < cityCollect.size(); i++)
            {
                 DefaultMutableTreeNode node = (DefaultMutableTreeNode)cityCollect.get(i);
                 CityRow row = (CityRow)node.getUserObject();
                 System.out.println("city "+row);
                 model.addRow(new Object[] {row.getCityId(),
                            row.getCityFarsiName(),
                            row.getCityEngName(),
                            row.getPrefix()
                       });
             
            }
           cityTable = new JTable(model);        
           cityTable.getColumnModel().getColumn(0).setMaxWidth(60);
           cityTable.getColumnModel().getColumn(0).setPreferredWidth(60);
           cityTable.getColumnModel().getColumn(3).setMaxWidth(200);
           cityTable.getColumnModel().getColumn(3).setPreferredWidth(200);
           cityTable.setEnabled(false);
         }
         else
         {
            JOptionPane.showMessageDialog(null, "Clearing table");
            cityTable.setModel(new DefaultTableModel());
         }  
         
    }