Jtable problem in changing the row selected

Question

hi,
I am displaying the oracle database information in JTable...user can make changes to a row...once he presses either ENTER,UP OR DOWN ARROW...the changes should be updated into the database...if there is some SQL exception,i am displaying JOptionPane to show the exception message ...i need to keep the selected row to be the one with errors...
my problems are:
i have written a function to update the change to the database...
when should i call that...right now i am calling that in tableChanged method... is there any method to dissable the predefined keys and actions? becaz once user makes changes to a row and presses some key like up/down or enter,the control is getting transfered to the next row...
plz give me the solution...
here is part of my code....
I am adding data later....
     model= new DefaultTableModel((Vector)null,columnNames);
     table = new JTable(model)
     public void tableChanged(TableModelEvent e)
          int firstRow = e.getFirstRow();
     if (e.getType()==TableModelEvent.UPDATE &&(firstRow!=TableModelEvent.HEADER_ROW))
          updateChangesToDatabase(row);
/********in my update method i am setting the focus to the same row
if i get exception....like this....
JOptionPane.showMessageDialog (thisPanel,sb,"Error in UPDATING...",JOptionPane.ERROR_MESSAGE);
table.requestFocusInWindow();
table.setRowSelectionInterval(currentRow,currentRow);
     super.tableChanged(e);
          setUpTableData(); // method to add data...to table..
          table.setDragEnabled(false);
          table.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);
          JScrollPane scrollPane = new JScrollPane(table,JScrollPane.VERTICAL_SCROLLBAR_AS_NEEDED,JScrollPane.HORIZONTAL_SCROLLBAR_AS_NEEDED);
          add(scrollPane,BorderLayout.CENTER);
// this i am doing to reset keyboard action but not working....
          table.resetKeyboardActions();

Answer 1

ye rammohan,
you can change the data-element of the field or char of the data-element.
if you try to change the name of the field, it deletes.
so what you can do is, keep the field unchanged, add another field of your choice, using ABAP program, move the data from old field to new field, and then you can delete your old field.
thx
rams