NHibernate Linq Provider question

Question

Can anyone answer me what are the differences of

Session.Query
Session.Linq and
Session.QueryOver

What I'm really interested in:
What would be supported in the future versions.
What should I start to use in a clean project.

Please tell me your thoughts about these three...

Thanks, Zoltán

Answer 1

Session.Query is the class to use when you want to use the new and much improved linq provider in NHibernate 3.0. If you are using linq and you are starting a new project, this is the class to use.

Session.Linq is the class to use if you what to use the old linq provider. I would say that you would only be using this class with older code bases. The older linq provider is really a wrapper around the Criteria API and, while fine for simpler queries, it is known to have limits once things get more demanding.

Session.QueryOver is a wrapper around the Criteria API of NHibernate. If you are already well versed in the Criteria API, this is a very approachable interface. It eliminates most of the strings, replacing them with lambda expressions. It is a very fluent interface. The syntax is linq-like but this is not a linq provider.

At this point in time I would say you would want to be using the Query and the QueryOver interfaces.