Probably the definition of the pattern will help you"A Unit of Work keeps track of everything you do during a business transaction that can affect the database."http://martinfowler.com/eaaCatalog/unitOfWork.html
Note : business transaction 2009/3/17 gavin.schultz <[email protected]> > > I've read an awful lot about unit-of-work and sessions and so on, and > watched Ayende's excellent webcast about App Architecture, but I'm > still getting confused. There seem to be conflicting pieces of advice. > For instance it is said (paraphrasing here): > > * NHibernate allows you to design your business entities & services so > that they have no knowledge of NHibernate or sessions; in other words, > they are not coupled at all with the way in which the data is > persisted. > > That sounds just wonderful, but then I read: > > * DO NOT open a new session for each of your repositories, or for each > of the calls within the repository. Instead use a context-based > session outside the repository. Such as the Unit Of Work e.g. the one > in Rhino Commons. > > And that sounds perfectly fine too, because hey, ideally I'd like to > work on my objects without opening new sessions all the time, and give > the ability to do transactions across different repositories, and so > on. > > But hang on, doesn't that mean that we're putting the Unit Of Work > classes up in the business entities and services? And doesn't that > mean that we're coupling the business layer to the persistence layer > in the end? In particular aren't we coupling the business layer to > NHibernate (since it seems everywhere we talk about Unit Of Work, we > really mean an NHibernate session wrapper)? Or do we not consider the > Unit Of Work to be part of that layer, do we think of it as some kind > of business abstraction? > > We all seem very strict about setting the boundaries between what the > different layers can access, but I'm unclear about where the Unit Of > Work fits into those layers - does it basically cross-cut everything? > > Sincerely confused and grateful for any advice, > > Gavin > > > > -- Fabio Maulo --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "nhusers" group. To post to this group, send email to [email protected] To unsubscribe from this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/nhusers?hl=en -~----------~----~----~----~------~----~------~--~---
