JTable does not update after fireTableDataChaged

Question

Hi everybody,
I have a strange problem here and I don't know how to solve it. In my applet I use a JTable which displays data from a database and uses a customized table model. The JTable has 2 columns and is NOT editable, i.e. you should not be able to change the values directly in the table itself. Instead, a JDialog is opening when somebody makes a doubleclick on a row of the JTable. In this JDialog one can change the data of the selected row and afterwards the JTable and the database should be updated. The database gets updated but not the JTable, although I called myTableModel.fireTableDataChanged()
When I close (dispose) the screen which contains the JTable and then recreate the screen with the JTable (using new MyScreen(....)), then the changes are displayed in JTable (because the table model requeries the database). But when I update the database AND the table model of JTable (via setValueAt) then the changed row is displayed 3 times instead of just 1 time!
Do I have to update both, the database and the table model or is it enough to update the database and call myTableModel.fireTableDataChanged() ?
But as said in the first case the changed row is displayed 3 times and in the second case the changes are displayed not at all. Do you know a solution?
I attach some code snippets.
Your help is appreciated very much!
//should update the table model of JTable
public void setValueAt(Object aValue, int rowIndex, int columnIndex)
row = (Vector) data.elementAt(rowIndex);
row.add(columnIndex, aValue);
data.add(rowIndex,row);
//should update the JTable and the database
if((oldRecipeName.equals(recipeName)) && (oldDesigner.equals(designer)))
//no data-saving necessary
currentDialog.dispose();
else
//save and close
tableModel.setValueAt(recipeName,selectedRow,0);
tableModel.setValueAt(designer,selectedRow,1);
updateRecipe(); //this is a method which updates the database
tableModel.fireTableDataChanged();
currentDialog.dispose();

Answer 1

dear, dear, dear !
in the setValueAt() method, u r adding a new line everytime to the vector. u should not add the data, u should replace the data. change the setValueAt() method to
public void setValueAt(Object aValue, int rowIndex, int columnIndex)
row = (Vector) data.elementAt(rowIndex);
row.setElementAt(columnIndex, aValue);
//data.add(rowIndex,row); don't need to call this. Changes would be reflected in data also.
ta,