try{
        con = DriverManager.getConnection("jdbc:mysql://localhost:3306/sampledata","root","");
        String sql= "SELECT * FROM studentinfo";
        pst=con.prepareStatement(sql);
        rs=pst.executeQuery();
        jTable1.setModel(DbUtils.resultSetToTableModel(rs));
        }
        catch(Exception ex){
            JOptionPane.showMessageDialog(null, ex);
        }






try {
            // TODO add your handling code here:
            String sql = "INSERT INTO studentinfo" + "(FIRSTNAME, LASTNAME, GRADELEVEL, SECTION, CN)" + "VALUES (?,?,?,?,?)";
            con = DriverManager.getConnection("jdbc:mysql://localhost:3306/sampledata","root","");
            pst = con.prepareStatement (sql);
            pst.setString(1, textfn.getText());
            pst.setString(2, textln.getText());
            pst.setString(3, textgl.getText());
            pst.setString(4, textsection.getText());
            pst.setString(5, textcn.getText());
            pst.executeUpdate();
                JOptionPane.showMessageDialog(this, "Added Successfully");
        } catch (SQLException ex) {
            Logger.getLogger(StudentRegistry.class.getName()).log(Level.SEVERE, null, ex);
        }