private void AddbtActionPerformed(java.awt.event.ActionEvent evt) {
    String id = idFld.getText() ;
    String item = ADDfld.getText();
    String amount = AMOUNTfld.getText();
          try {

    con=DriverManager.getConnection("jdbc:mysql://localhost:3306/isdb","root","");

   String query = "Insert into item (id,NAME,AMOUNT) values (?,?,?)";

     pst = con.prepareStatement(query);

      pst.setInt(1, Integer.parseInt(id));
     pst.setString(2, item);
     pst.setString(3,amount);
      pst.execute();

} catch (SQLException ex ) {

    JOptionPane.showMessageDialog(null, ex);

 }

        ADDfld.setText("");
         idFld.setText("");
        AMOUNTfld.setText("");
        updateCombo();
         update_Table();