Edit Saved items from the Database.

Question

Good afternoon, 


My question is that How do I go about editing saved items from a Database to an application.

I am already able to save to a database, however how can you implement that when a data is changed it is also changed back to the database.

For example - FirstName = David
Later on you can then decide to change the same First name to - Sam.


Any help will be appreciated.


Regards.