Question

What would be the syntax in an nhibernate (version 3.3) query (criteria?) for the following SQL statement:

SELECT DISTINCT usr.* FROM User usr, User_SecurityGroup grp, SecurityGroup_Permission prm, Permission org 
WHERE usr.Id = grp.User_id AND grp.SecurityGroup_id = prm.SecurityGroup_id AND org.Id = prm.Permission_id 
AND org.Site_id IN (1,2,3) AND org.PermRead = 1 AND usr.Active = 1 AND org.Active = 1;

I am unsure how the joins would be done between the tables and the criteria syntax to complete such a task.

For this particular query, the list of Site ids will be passed in

Also the condition “org.PermRead = 1”, the property name will be dynamic. so it could be “PermWrite”.

Edit:
Ok so this is what I have so far

        ICriteria criteria = this.Session.CreateCriteria<User>();

        criteria.Add(Restrictions.In("User.Site", siteList.ToArray()));
        criteria.Add(Restrictions.Eq("User.Active", true));
        criteria.Add(Restrictions.Eq("Site.Active", true));
        criteria.Add(Restrictions.Eq(Enum.GetName(typeof(Perm.Types), access), true));

        criteria.SetResultTransformer(Transformers.DistinctRootEntity);
        return criteria.List<User>();

I think a join would be in a format like this:

        criteria.CreateAlias("Sites", "Sites", NHibernate.SqlCommand.JoinType.LeftOuterJoin); 

Answer 1

I ended up with this:

       ICriteria criteria = Session.CreateCriteria<User>()
            .CreateAlias("SecurityGroups", "SecurityGroups")
            .CreateAlias("SecurityGroups.Permissions", "Permissions")
            .Add(Restrictions.Eq("Permissions.Active", true))
            .Add(Restrictions.Eq("Active", true))
            .Add(Restrictions.In("Permissions.Site", ids.ToArray()))
            .Add(Restrictions.Eq("Permissions.Perm" + Enum.GetName(typeof(Perm.Types), accessRight), Perm.Level.Allow));
        return criteria.List<User>();