Downside of Law of Demeter

Author indicates pass through methods (or new parameters added just to pass through?) are a necessary evil of LOD:

The downside is a number of "pass through" methods that do nothing but forward the message to the next child object... Like many OO guidelines, it's probably impossible and impractical to follow this one 100% of the time. The balance between spreading knowledge and adding overhead is a judgment call but I generally vote for more encapsulation until the overhead becomes too painful. 

http://www.ccs.neu.edu/research/demeter/demeter-method/LawOfDemeter/LawOfDemeter.htm

Law of Demeter

The issue here is that LoginPage is breaking a the Law of Demeter. LoginPage is asking for the Database even though it itself has no need for the Database (This greatly hinders testability as explained here). You can tell since LoginPage does not invoke any method on the Database.

http://misko.hevery.com/2008/10/21/dependency-injection-myth-reference-passing/