try
                {
                    //Driver :-)
                    DriverManager.registerDriver(new org.gjt.mm.mysql.Driver());  
                    //conexion de la BD
                    Connection conexion = DriverManager.getConnection ("jdbc:mysql://localhost/prueba","spider", "spider");
                    
                     // Preparamos la consulta
                    Statement s = conexion.createStatement();
                    //ResultSet rs = s.executeQuery ("select * from persona where nombre = ' + unir + ' ");
                    ResultSet rs = s.executeQuery ("select * from persona where nombre = ?");
                    rs.setString(1, unir);
                    
                    while (rs.next())
                    {
                        System.out.println (+ rs.getInt (1) + " " + rs.getString (2)+ " " + rs.getString(3) + 
                                " " + rs.getString(4) + " " + rs.getString(5));
                    }
            
                    //Cerrar la conexion 
                    conexion.close();
                    
                }catch (SQLException e)
                {
                    e.printStackTrace();
                }
                
                //Hacer eco de a información del paquete al cliente 
                display.appendText("\n\nDevolviendo datos al cliente...");
                sendpacket = new DatagramPacket(data,data.length, receivepacket.getAddress(),5001);
                sendsocket.send(sendpacket);
                display.appendText("Paquete enviado\n");
                
                
            }catch(IOException exception)
            {
                display.appendText(exception.toString() + "\n");
                exception.printStackTrace();
            }