The Id for the entity we were generating was a comb guid. Rather than the
code setting this we just changed the id generator to "guid.comb". No select
is performed by NHibernate by default when we perform a save.

Thanks for the help
Billy Stack

On Sat, Feb 5, 2011 at 3:10 PM, Jason Meckley <[email protected]>wrote:

> this worked in my situation, but the entities I was saving where children
> of a parent entity that was resolved from session. so the context is
> slightly different. In your situation it sounds like the entity with the
> assigned id is the root.
>
> You know it's an insert only model, but NH doesn't know that, so it needs
> to check if it exists. There may be a mapping/configuration setting that
> prevents load before save, or prevents updates, but I not 100% sure about
> that.
>
> If that doesn't work (or exist) I would change the POID strategy to allow
> NH/DB to handle it. If the assigned ID has business meaning, then map this
> as an immutable attribute of the entity.
>
> Another option is to drop the use of NH altogether. I haven't used event
> sourcing myself, but what little I understand it suppose to simplify
> persistence concerns. If that's the case then NH or an RDBMS wouldn't be
> required.
>
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