Oren Eini

aka Ayende Rahien

Oren Eini

CEO of RavenDB

a NoSQL Open Source Document Database

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oren@ravendb.net

+972 52-548-6969

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RavenDB Workshops - Deep dive into practical use of Document Data Modeling

Jun 04 2007

Debugging NHibernate

time to read 2 min | 257 words

Today we had a problem with an NHibernate query that was failing which had quite stumped. Pulling the usual tricks didn't work, debugging NHibernate was problematic, since the failing query was damn complex, and I had no clear idea why this was failing. After a while, I decided that trying the top down approach will not work, and that I need more structure in finding out the issue.

Did I mentioned that the query was complex? The object model is big as well, and the query managed to touch just about all of it. Getting it slimmed down to a reproducable version was hard, because I wasn't sure what caused the issue, but eventually I managed to get it to fail the way I wanted it. (In the process I walked through parts of NHibernate that I haven't met before, interesting.

The end result are these tests (there is a reason that I know that C# has a 512 characters limits on identifiers):

CanMakeCriteriaQueryAcrossBothAssociationsWhenBothAssoicationsHasSameColumnKeyNameAndUsingPagingInSqlServer2005
CanLoadCollectionUsingLeftOuterJoinWhenBothCollectionsHasTheSameColumnKeyNameAndOneIsNull

I still don't have an answer, but now I have much harder questions...

This post is dedicated to Rinat, who says that she doesn't knows NHibernate, but can make queries so complex both NHibernate and SQL Server begs for mercy.

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