NHibernate many-to-many criteria

Question

I have entity Problem mapped using many-to-many to entity Tag (Problem has a list of tags). I want to load all the Problems, which have specific Tags.
For example:
Problem1 (tag1)
Problem2 (tag1, tag2)
Problem3 (tag1, tag3)
Problem4 (tag3, tag4)
I want to get the problems by filter "tag1, tag2". The system shall return:
Problem1 (tag1)
Problem2 (tag1, tag2)
Problem3 (tag1, tag3)
I have been puzzling over this problem for a week already. Have you any ideas?
P.S. Load all the list and filter it using LINQ is the last possible variant...

score 2 · Accepted Answer · answered Sep 26 '10 at 13:14

2

HQL is a better fit for these queries than Criteria.

One possible solution:

session.CreateQuery(@"select distinct p
                      from Problem p
                      join p.Tags t
                      where t in (:tags)")
       .SetParameterList("tags", listOfTags)

answered Sep 26 '10 at 13:14

Diego Mijelshon

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Can I use HQL query and criteria together? The matter is I need paging too (SetFirstResult() and SetMaxResult()). – Sergey Metlov Sep 26 '10 at 15:09
HQL and Criteria are different methods. But you can use SetFirstResult and SetMaxResult on HQL queries too. – Diego Mijelshon Sep 26 '10 at 15:58

NHibernate many-to-many criteria

1 Answers1