fluent nhibernate select n+1 problem
- by Andrew Bullock
I have a fairly deep object graph (5-6 nodes), and as I traverse portions of it NHProf is telling me I've got a "Select N+1" problem (which I do).
The two solutions I'm aware of are
Eager load children
Break apart my object graph (and eager load)
I don't really want to do either of these (although I may break the graph apart later as I forsee it growing)
For now....
Is it possible to tell NHibernate (with fluentnhib) that whenever i try to access children, to load them all in one go, instead of selectn+1ing as i iterate over them?
I'm also getting "unbounded results set"s, which is presumably the same problem (or rather, will be solved by the above solution if possible).
Each child collection (throughout the graph) will only ever have about 20 members, but 20^5 is a lot, so i dont want to eager load everything when i get the root, but simply get all of a child collection whenever i go near it
Edit: an afterthought.... what if i want to introduce paging when i want to render children? do i HAVE to break my object graph here, or is there some sneakyness i can employ to solve all these issues?
