The database is remote to AppGameKit, so you make an HTTP request to get access to it.
The missing item here is what is listening to the request so it can process it and query the database, whether it is remote or local.
If it's local, you won't be making an HTTP request.
A remote call would typically be to a server side database which would use SQL to obtain the result.
If you are considering a local / offline version, then are you looking to implement a local custom database search or what? Id so, what is the local engine you have in mind?
I'm guessing you are looking for native support and there isn't any; you'll have to implement something yourself.