nHibernate不同的查询

Question

代码

IList VendorList;

                VendorList = session
                    .CreateCriteria<VendorLookup>()
                    .Add(Expression.Eq("NetworkRunId", networkRunId))
                    .Add(Expression.Not(Expression.Eq("VendorName", " ")))  
                    .SetResultTransformer(new NHibernate.Transform.DistinctRootEntityResultTransformer())
                    .AddOrder(new Order("VendorName", true))
                    .List<IVendorLookup>().Distinct<IVendorLookup>().ToList();

生成的查询请帮我解决

SELECT   this_.Sp    as HCO1_25_0_,
         this_.NID  as Network2_25_0_,
         this_.Vname as HCO3_25_0_
FROM     HCO_V_Lookup this_
WHERE    this_.NID = 5 /* @p0 */
         and not (this_.VNAME = ' ' /* @p1 */)
ORDER BY this_.VNAME asc

Answer 1

我认为你想知道为什么DISTINCT没有出现在SQL中。这是因为它在您的条件查询中作为结果转换器应用 - 在查询运行后，SQL查询结果被过滤以使它们不同。

Answer 2

ICriteria criteria = session.CreateCriteria(typeof(Person));
criteria.SetProjection(
    Projections.Distinct(Projections.ProjectionList()
        .Add(Projections.Alias(Projections.Property("FirstName"), "FirstName"))
        .Add(Projections.Alias(Projections.Property("LastName"), "LastName"))));

criteria.SetResultTransformer(
    new NHibernate.Transform.AliasToBeanResultTransformer(typeof(Person)));

IList people = criteria.List();