将此SQL查询转换为NHibernate Criteria Queries

Question

需要将此sql查询转换为nhibernate准则语言...我该怎么做？

 select 
     * 
 from Feeds where Id = 
 (select MAX(Id) from Feeds where DataId = [VARIABLE PARAMETER])

Answer 1

Feed feed = _session.CreateCriteria<Feed>()
    .Add(Restrictions.Eq("DataId", "[VARIABLE PARAMETER]"))
    .AddOrder(new Order("_id", false))
    .SetMaxResults(1)
    .List<Feed>()
    .FirstOrDefault();

这将导致类似：

select TOP 1 * from Feeds where DataId = ??? Order By Id desc

从性能的角度来看，应该没有difference。