Updating a JTable after Inserting Record

[muhindi]

Greeetings All,
Iam developing a swing application with a derby database and using Toplink JPA for persistence. My issue is that the JTable will not update to reflect the inserted record.

For the table, I have created a tablemodel that extends DefaultTableModel and implements TableModelListener and in the tableChanged method of the class I've tried a variety of update methods e.g validate(), revalidate(), and SwingUtilities.updateComponentTreeUI(comp).None seems to work.:(

I've called the fireTableDataChanged() method after adding my record . I am out of ideas on the issue. I could post some snippets of the code I have if need be.

Help.

[doWhile]

Is the insert into the DB reflected in the data model that backs the JTable? I suggest posting an SSCCE that demonstrates the problem to clarify

[muhindi]

Pardon for the delay in reply. Yes the database reflects the inserted record but only
after I run the application again is the new record shown.
The custom table model I created is

// class AppModel : The Customized tableModel to 
    // facilitate updating of the JTable after records are inserted

    class AppModel extends DefaultTableModel implements TableModelListener{

        public AppModel(){
            System.out.println("AppModel created");
        }
        

        public void tableChanged(TableModelEvent e) {
           
              if(e.getType()==TableModelEvent.INSERT){
             		tblStores.validate();//tried this did'nt work
            		System.out.println(" New Record Added ");
            	}
		
        }

In the Netbeans form designer I used post creation code tab on the properties window to attach my
custom tableModel to the Jtable and also set the Listener as below:

tblStores.setModel(appmodel);
tblStores.getModel().addTableModelListener(appmodel);

In the addStore button I added the following code:

Stores s=new Stores(txStoreName.getText(),txBuilding.getText(),
                    txStreet.getText());
            if(dbworker.addStore(s))//after successful insert to database...
{
                     appmodel.fireTableDataChanged();// call tableChanged() in custom table model

The tableDataChanged method is being executed since I can see the "New record Added "statement
on the console. But the JTable just wont refresh.
I hope these snippets will help in clarification of the problem.

[kiruba]

i need help......

tell me how can i remove Table header...
i tried columnRemove method .it removed the column but when ever i add new column using model.addColumn("new Field"); but what happened here old header and new header are append...
what i need means i need only the new header only...
and this is my code:::::

package sample;

import javax.swing.*;
import javax.swing.table.*;
import java.awt.*;

public class TableColumnRemove {

DefaultTableModel model;
JTable table;

public static void main(String[] args) {
new TableColumnRemove();
}

public TableColumnRemove() {
JFrame frame = new JFrame("Remove a column from a JTable");
JPanel panel = new JPanel();
String data[][] = {{"Vinod", "MCA", "Computer"},
{"Deepak", "PGDCA", "History"},
{"Ranjan", "M.SC.", "Biology"},
{"Radha", "BCA", "Computer"}};
String col[] = {"Name.", "Course", "Subject"};
model = new DefaultTableModel(data, col);
table = new JTable(model);
JTableHeader header = table.getTableHeader();
header.setBackground(Color.yellow);
JScrollPane pane = new JScrollPane(table);
panel.add(pane);
frame.add(panel);
frame.setSize(500, 150);
frame.setUndecorated(true);
frame.getRootPane().setWindowDecorationStyle(JRoot Pane.PLAIN_DIALOG);
frame.setVisible(true);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOS E);

int columnCount = table.getColumnCount();
for (int i = 0; i < columnCount; i = 0) { // here im remove columns
Remove(table, i);
columnCount = table.getColumnCount();
}
model.addColumn("new Field"); //after add new column

}

private void Remove(JTable table, int col_index) {
TableColumn tcol = table.getColumnModel().getColumn(col_index);
table.removeColumn(tcol);

}
}

[muhindi]

SOLVED AT LAST!! Worked on it for 3 nights. Solution ?.

1. I set the List holding the query resultset to observable.
2. In the eventhandler responsible for persisting the entity, I added the following single line of code:

 myList.add(myObject);

This will cause the change(insert or delete) to be 'viewable' on the JTable.

Hope this helps someone else.;)