NHibernate的選擇與SqlFunction列，按照相同的標準組

Question

我需要查詢計數基於每一天以及組由相同的標準。生成的查詢應該類似於

select SendTo, dateadd(dd, 
       0, 
       datediff(dd, 
          0, 
          WorkToBeginDate)) 
from Locates 
group by SendTo, dateadd(dd, 
       0, 
       datediff(dd, 
          0, 
          WorkToBeginDate)) 

我目前使用下面的查詢，但它由date不羣。

var dateGroupBy = Projections.SqlFunction("date", NHibernateUtil.Date, 
    Projections.Group<Domain.Locate>(g => g.WorkToBeginDate)); 

var stats = 
    _session.QueryOver<Domain.Locate>() 
    .SelectList(x => x 
     .SelectGroup(xx => xx.SendTo).WithAlias(() => statsDto.SentTo) 
     .SelectCount(xx => xx.LocateId).WithAlias(() => statsDto.Count) 
     .Select(dateGroupBy) 
     .WithAlias(() => statsDto.DueDate)) 
    .TransformUsing(Transformers.AliasToBean<StatsDto>()) 
    .List<StatsDto>(); 

執行此查詢產生

SELECT this_.SendTo        as y0_, 
     count(this_.LocateId)     as y1_, 
     dateadd(dd, 
       0, 
       datediff(dd, 
          0, 
          this_.WorkToBeginDate)) as y2_ 
FROM  Locates this_ 
GROUP BY this_.SendTo, 
     this_.WorkToBeginDate 

我猜想這是因爲我使用Select和我的預測並不SelectGroup。我試過.SelectGroup(xx => new SqlFunctionProjection("date", NHibernateUtil.Date, Projections.Group<Domain.Locate>(g => g.WorkToBeginDate)))，但是這給了我Could not determine member from new SqlFunctionProjection("date", NHibernateUtil.Date, new [] {Group(g => Convert(g.WorkToBeginDate))})。

Answer 1

您可以將dateGroupBy值與另一個Projections.Group方法相嵌套。

var dateGroupBy = Projections.Group(Projections.SqlFunction("date", NHibernateUtil.Date, 
Projections.Group<Domain.Locate>(g => g.WorkToBeginDate))); 

這應該給你想要的結果。 :)