nhibernate-projections

I am a little confused about Hibernate's projections and criteria . When to use projections and when to use criteria? They're not mutually exclusive, you can use both at the same time. Projections are generally used in the context of some Criteria. To put it simple, Hibernate Projections are used in order to query only a subset of the attributes of an entity or group of entities you're querying with Criteria. You can also use Projections to specify distinct clauses and aggregate functions like max , sum and so on. It's like referring to which data you're fetching. Like modifying the select

Is it possible that I can project collection in NHibernate? For Example: User { UserGuid, IList<Groups> UserGroups, } User userEntity = null; _session .StatefulSession.QueryOver(() => userEntity) .SelectList(list => list .Select(x => x.UserGuid).WithAlias(() => userEntity.UserGuid) //How can I project group collection here? .Select(x => x.Groups).WithAlias(() => userEntity.Groups) ) .TransformUsing(Transformers.AliasToBean<UserEntity>()) .List(); Radim Köhler We have to thing about projection as a single SELECT clause. What we would be able to do with it on a DB side, we can mimic with

Using NHibernate 2.1, I'm trying to project an entity and its child collection into a DTO. My entity looks like this.. public class Application { public int Id {get;set;} public string Name {get;set;} public List<ApplicationSetting> Settings {get;set;} // A bunch of other properties that I don't want in the DTO } public class ApplicationSetting { public int Id {get;set;} public string Name {get;set;} public string Code {get;set;} // A bunch of other properties that I don't want in the DTO } My DTO looks like this.. public ApplicationDto { public int Id {get;set;} public string Name {get;set;}