You have Ghosts.
http://fabiomaulo.blogspot.com/2008/10/how-test-your-mappings-ghostbuster.html

<http://fabiomaulo.blogspot.com/2008/10/how-test-your-mappings-ghostbuster.html>A
ghost may appear because, wrong mapping, stale data (null in DB and not
nullable property) and so on

2010/2/24 Billy Stack <[email protected]>

> All,
>
> I have the following scenario:
>
>    Start Unit of work (SessionFactory.OpenSession())
>
>    Get collection of Entities (e.g. 10 in size) from db
>
>    Update only one entity
>
>    Dispose the Unit of work (Where we call ISession.Flush())
>
>
> The problem I am finding is that 10 update statements are generated -
> one for each entity in the collection, even though I only actually
> updated one entity.
>
> How does NHibernate think that objects in the collection are dirty
> even though they weren't updated?
> I am using nullable types, is this the issue?
> Ref:
> http://stackoverflow.com/questions/34852/nhibernate-session-flush-sending-update-queries-when-no-update-has-occurred
>
> Is this the right way to be using the Session, should I be calling
> Session.SaveOrUpdate() ?
>
> Any help greatly appreciated...
>
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-- 
Fabio Maulo

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