String Qry0="Insert into student(firstname,lastname)values(?,?)";
                try {
                      pst=conn.prepareStatement(Qry0);
                      pst.setString(1, txtFirstname.getText().trim());
                      pst.setString(2, txtLastname.getText().trim());
                      pst.execute();
                      JOptionPane.showMessageDialog(null,"SAVE SUCCESSFULLLY");
                 } catch (SQLException ex) {
                    Logger.getLogger(nullOutput.class.getName()).log(Level.SEVERE, null, ex);
                 }