This class provides methods for fetching the ID of selected landmark or category and the handle to database to which either landmark or category belongs.
The client application executes this method to get the handle to a landmark database.
The client takes the ownership of database handle. The database pointer is the same for all landmarks from the same database. It is the responsibilty of the API client to manage these database pointers and delete those pointers.
Returns:
handle to database to which the landmark or category belongs