That is all for this chapter on making changes to your data. We have covered quite a bit in this chapter: adding data; deleting data; updating existing data; and we put it all together in a GUI application at the end!
The code in this chapter is a great starting point. If you enjoy challenges, add some error handling to the GUI. Add to the code so that the user gets back friendly error messages and handles any exceptions that may arise.
As you continue in this book, you explore more database features. All of these new features can be added to these examples. This code is meant to be built upon, not tossed aside with each new application. Expand, explore, and experiment with the code! Do not worry about 'breaking' something; you won't-but if you don't try new things, you won't learn as much.