Is it possible to implement Lazy Loading within a user type?
On Oct 24, 4:22 am, Valeriu Caraulean <[email protected]> wrote:
> Yes, the IUserType is the way to go. More than that, it will work...
>
> Few implementation details:
> - IUserType.NullSafeSet: store only the Id of your custom field from
> the object passed in
> - IUserType.NullSafeGet: by Id stored previously read your field
> from repository/service
> - SQLType - your Id type
> - ReturningType - the type of your custom field.
>
> If you want, you can inject a service/repository in IUserType with an IoC.
>
> Valeriu
>
> On Sat, Oct 24, 2009 at 12:04 AM, Matt Mangold
>
>
>
> <[email protected]> wrote:
>
> > My domain objects support custom fields that are stored in such a way
> > that requires metadata and logic to be applied before their values can
> > be stored and retrieved.
>
> > I already have a Custom Field Repository that handles the persistence
> > of custom fields, and I don't want to try to recreate that logic in
> > NHibernate mappings.
>
> > I would however like to support lazy loading of my custom fields. It
> > would be nice if I could somehow trick the proxy into calling my
> > dedicated repository for loading and saving rather than going through
> > the NHibernate engine.
>
> > One way I solved this problem was to implement an interceptor which
> > worked, but I took a performance hit when loading large amounts of
> > data, because the dedicated repository was called each time an entity
> > was loaded. It would be nice instead, if those calls to load custom
> > fields were done lazily! From what I understand lazy loading cannot be
> > done in an interceptor.
>
> > I have looked into implementing a custom user type (IUserType and
> > IUserCollectionType), but the documentation is very limited, and I
> > want to learn if it is even possible to do what I want before I go
> > down the path of trying.- Hide quoted text -
>
> - Show quoted text -
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