Question

I have a JTable and DefaultTableModel at class level.
First time when I initialize the jTable and Model I add 10 rows.
on Button click I get 3 rows from my database so I have to show only these 3 rows by removing earlier 10 rows.
I do this using tableModel.setDataVector(data, columnNames);
But the main problem is, the table only replaces 3 old rows with new one and still remaining 7 rows are shown as it is.

Can any one help?

Thanks,
Jai

Answer 1

If I have understood, you want to reconstruct the table with the 3 rows from the database and delete the earlier 10 rows. If that is true then do this,

 public void actionPerformed(ActionEvent e) {
   // If the action is for getting data from DB then do,
   DefaultTableModel dtm = (DefaultTableModel) myTable.getModel();
   // int rowCount = dtm.getRowCount();
   /*
     for (int row = rowCount - 1; row >= 0; row--) {
        dtm.removeRow(row); 
   } */
   // or
   if(dtm.getRowCount() > 0) {
     dtm.setRowCount(0);
   }
// Add code to get your 3 rows from the database.
}