Question

I am trying to use ICriteria to create a query that has a join
condition. The SQL I am trying to generate should look like this

SELECT c.ClientID
FROM Client c
LEFT OUTER JOIN ClientContact t on c.ClientID = t.ClientID AND
t.ContactType = 'Email'

If I use a criteria like

m_ClientRepository.QueryAlias("client")
     .CreateCriteria("client.Contacts", "c", JoinType.LeftOuterJoin)
     .Add(Restrictions.Eq("c.ContactType", ContactType.Email));

It will generate the sql below which I don’t want.

SELECT c.ClientID
FROM Client c
LEFT OUTER JOIN ClientContact t on c.ClientID = t.ClientID
WHERE t.ContactType = 'Email'

Is there anyway to do this with ICriteria or HQL if ICriteria is not possible ?

Edit: I have discovered nHibernate 2.1 (which I am using) does now allow this. Not sure about ICriteria though, this is my preference.

Answer 1

I have found the only way to do this with NHibernate 3 and before is via filters like in this example

In NHibernate 3.1 this is now supported in a better way, https://nhibernate.jira.com/browse/NH-2190