If NH does unnecessary updates, it is mostly due to implicit changes
within the entity. The properties must always return the exact value
that has been set by NH, if it is a collection, the entity must return
the same instance as set by NH, unless NH treats it as a change and
updates the database.
I never saw any issues with {get; set;} (which does not mean that
there aren't.)
Your code looks fine to me, but I don't know Fluent much. Is this
really the full code to reproduce the problem? You didn't leave
anything away because you thought it is irrelevant? For instance a
property getter or setter implementation?
On 22 Jul., 16:24, Fabio Maulo <[email protected]> wrote:
> for autoproperties and access to field you can useaccess="backfield"
>
> 2009/7/22 Markus Zywitza <[email protected]>
>
>
>
> > Can you try with a backing field for Categories initialized with a
> > List<..>-instance?
>
> > I had strange issues before with autoproperties on collections.
>
> > -Markus
>
> > 2009/7/21 steves <[email protected]>
>
> >> Hi,
>
> >> I have entity User with one-to-many relationship to
> >> UserToUserCategories. When I load user from database, do not change it
> >> and than flush the session, NHibernate will performs UPDATE of the
> >> user and increment it's version. It seems to me as unwanted behaviour,
> >> imagine that I load hundred of users and NHibernate would update them
> >> all when flushing. Here is the code:
>
> >> public abstract class EntityBase
> >> {
> >> public virtual Guid Id { get; set; }
> >> public virtual int Version { get; set; }
> >> }
>
> >> public class User : EntityBase
> >> {
> >> public virtual IList<UserToUserCategory> UserToUserCategories
> >> { get; set; }
> >> }
>
> >> public class EntityBaseMap<T> : ClassMap<T> where T : EntityBase
> >> {
> >> public EntityBaseMap()
> >> {
> >> this.OptimisticLock.Version();
> >> this.DynamicUpdate();
> >> this.Id(t => t.Id);
> >> this.Version(t => t.Version);
> >> }
> >> }
>
> >> public class UserMap : EntityBaseMap<User>
> >> {
> >> public UserMap()
> >> {
> >> this.HasMany(u => u.UserToUserCategories)
> >> .NotFound.Ignore()
> >> .Cascade.All()
> >> .LazyLoad()
> >> .AsBag()
> >> .WithTableName("UserToUserCategory");
> >> }
> >> }
>
> >> session = SessionSource.CreateSession();
> >> var user = (from u in session.Linq<User>() select u).FirstOrDefault();
> >> session.Flush(); // here NHibernate does UPDATE statement of user's
> >> version
>
> >> Is this mapping incorrect? What am I missing?
>
> --
> Fabio Maulo
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