TicTacToe SQL Persistence

2023-06-23

My latest task for my TicTacToe project is to implement SQL persistence (a database). SQL is a relational database management system. I have previously implemented a file persistence, and since I adhered to the Open-Closed principle, adding SQL functionality is easy. I already have an interface called Database and type called FileDatabase which implements the initialize, fetch-all-games, update-game, and delete-game functions. So all I have to do is make another type called SQLDatabase and implement those function and everything works perfectly. The fact that I did not have to modify existing code to add this feature shows that I was adhering to the Open-Closed principle because my code was open for extension and closed for modification.