For iOS it is not possible to access an online database. You should send the data to a server side script like php and from there parse it into your database. Only need to recreate your database format on the server end.
Or export the database as a file and import it on your server with something like phpMyAdmin or something. It can import all different kinds of formats like .sql, .csv, .txt.. Whatever you like.
Good luck!
Hmm, after rereading I think you ask the question if the app is able to use the database from an online source after importing it there? Am I correct?
Simple answer.. for iOS. No. You have to return results to the app by using a POST or GET request.