Diego,
I'm a little confused by your answer, because the NHibernate docs say this:
14.1.3. Bags and lists are the most efficient inverse collections
Just before you ditch bags forever, there is a particular case in which bags
(and also lists) are much more performant than sets. For a collection with
inverse="true" (the standard bidirectional one-to-many relationship idiom,
for example) we can add elements to a bag or list without needing to
initialize (fetch) the bag elements! This is because IList.Add() or
IList.AddRange() must always succeed for a bag or IList (unlike a Set). This
can make the following common code much faster.
Parent p = (Parent) sess.Load(typeof(Parent), id);
Child c = new Child();
c.Parent = p;
p.Children.Add(c); //no need to fetch the collection!
sess.Flush();
Which of you is correct?
thanks
cliff
On Mon, Feb 22, 2010 at 10:46 PM, Diego Mijelshon <[email protected]>wrote:
> If you access the collection, it WILL be loaded (otherwise, the in-memory
> model would have an inconsistency)
> With one-to-many+many-to-one on the other side, it's easy to do, you just
> create the relationship on the other side (the one that has many-to-one.
> With many-to-many, well, you could choose the side that has less elements
> to work from, or refactor the relationship into two one-to-many collections
> with an intermediate entity, so you can just create instances of that
> entity.
> In any case... you should do these things ONLY if you are experiencing
> perfomance problems because of the collection load. Are you?
>
> Diego
>
>
>
> On Mon, Feb 22, 2010 at 13:53, Jonathan Curtis <[email protected]
> > wrote:
>
>> We have a entity with a many-to-many collection mapped as a lazy
>> loaded bag. When we load up the entity, the collection is not loaded -
>> great. Now we want to add a new entity to that collection. As soon as
>> we do this, the collection is loaded up.
>>
>> How do we add the new entity without loading up the whole collection
>> (the collection is large)?
>>
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thanks
cliff
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