nhibernate使用icriteria与一组和有，并获得总行数（C＃）

Question

所以我有一个nhibernate icriteria查询获取我想要的结果列表。

但是我不知道如何获得总行数。

public IEnumerable<SpecialismCombo> List(SpecialismListCriteria criteria, out int total) 
     { 
      //run the sub query 
      ICriteria countAgencies = m_SpecialismComboRepository.QueryAlias("sc"); 

      if (!String.IsNullOrEmpty(criteria.AgencyIds) && !criteria.AgencyIds.Equals("0")) 
      { 
       List<int> AgencyIds = criteria.AgencyIds.Split(new char[] { ',' }).ToList<int>(); 
       countAgencies.CreateAlias("Agencies", "a", NHibernate.SqlCommand.JoinType.InnerJoin); 
       countAgencies.Add(Restrictions.In("a.AgencyId", AgencyIds)); 
      } 

      total = Convert.ToInt32(
       countAgencies.SetProjection(
        Projections.CountDistinct("a.AgencyId") 
      ).UniqueResult() 
      ); 


      //create query 
      ICriteria query = m_SpecialismComboRepository.QueryAlias("sc"); 

      if (!String.IsNullOrEmpty(criteria.AgencyIds) && !criteria.AgencyIds.Equals("0")) 
      { 
       List<int> AgencyIds = criteria.AgencyIds.Split(new char[] { ',' }).ToList<int>(); 
       query.CreateAlias("Agencies", "a", NHibernate.SqlCommand.JoinType.InnerJoin); 
       query.Add(Restrictions.In("a.AgencyId", AgencyIds)); 
      } 

      query.Add(Restrictions.Eq(Projections.Count("SpecialismComboId"),total)); 

      ProjectionList pl = Projections.ProjectionList() 
         .AddPropertyAlias("SpecialismComboId", "SpecialismComboId") 
         .AddPropertyAlias("SpecialismComboDisplayText", "SpecialismComboDisplayText") 
         .AddPropertyAlias("SpecialismComboDisciplineDisplayText", "SpecialismComboDisciplineDisplayText") 
         .AddPropertyAlias("SpecialismComboIdText", "SpecialismComboIdText") 
         .Add(Projections.GroupProperty("SpecialismComboId")); 

      // set the right total for records being returned 
      total = query.ToRowCount(); 

      // Return the query results 
      return query 
       .SetProjection(Projections.Distinct(
        pl 
       )) 
       .SetResultTransformer(new KnownPropertyAliasToBeanResultTransformer(typeof(SpecialismCombo))) 
       .SetFirstResult(criteria.FirstRecord) 
       .SetMaxResults(criteria.PageSize) 
       .List<SpecialismCombo>() as List<SpecialismCombo>; 

     } 

我试图用一个ICriteriaExtension我们：

public static int ToRowCount(this ICriteria query) 
     { 
      return query.ToRowCountQuery().UniqueResult<int>(); 
     } 

但它返回null。

所以在SQL生成的查询是：

exec sp_executesql N'SELECT distinct top 15 this_.SpecialismComboId as y0_, 
(select dbo.fn_GetSpecialismComboDisplayText(this_.SpecialismComboId,''/'')) as y1_, 
(select dbo.fn_GetSpecialismComboDisciplineDisplayText(this_.SpecialismComboId,'', '')) as y2_, 
(select dbo.fn_GetSpecialismComboIdText(this_.SpecialismComboId,''|'')) as y3_, 
this_.SpecialismComboId as y4_ 
FROM dbo.SpecialismCombo this_ 
inner join AgencySpecialismCombo agencies3_ on this_.SpecialismComboId=agencies3_.SpecialismComboId 
inner join dbo.Agency a1_ on agencies3_.AgencyId=a1_.AgencyId WHERE a1_.AgencyId in (@p0) 
GROUP BY this_.SpecialismComboId HAVING count(this_.SpecialismComboId) = @p1',N'@p0 int,@p1 int',@p0=4741,@p1=1 

行数根据我上面的代码是

exec sp_executesql N'SELECT top 2147483647 count(*) as y0_ 
FROM dbo.SpecialismCombo this_ 
inner join AgencySpecialismCombo agencies3_ on this_.SpecialismComboId=agencies3_.SpecialismComboId 
inner join dbo.Agency a1_ on agencies3_.AgencyId=a1_.AgencyId WHERE a1_.AgencyId in (@p0) 
HAVING count(this_.SpecialismComboId) = @p1',N'@p0 int,@p1 int',@p0=4741,@p1=1 

但我需要它是象是这样的：

exec sp_executesql N'SELECT sum(idcount) from 
(select count(*) idcount 
FROM dbo.SpecialismCombo this_ 
inner join AgencySpecialismCombo agencies3_ on this_.SpecialismComboId=agencies3_.SpecialismComboId 
inner join dbo.Agency a1_ on agencies3_.AgencyId=a1_.AgencyId WHERE a1_.AgencyId in (@p0) 
GROUP BY this_.SpecialismComboId HAVING count(this_.SpecialismComboId) = @p1) as sub 
',N'@p0 int,@p1 int',@p0=4741,@p1=1 

但我再次无法弄清楚如何使用icriteria（这是我们的数据访问标准）来得到这个查询和公司正确的计数正在返回！

任何想法，将不胜感激:)

使用功能NHibernate 2.0，我相信。

谢谢！

Answer 1

回答我的一个同事想出了：

public IEnumerable<SpecialismCombo> List(SpecialismListCriteria criteria, out int total) 
     { 
      //create query 
      DetachedCriteria query = DetachedCriteria.For<SpecialismCombo>("sc"); 

      if (!String.IsNullOrEmpty(criteria.AgencyIds) && !criteria.AgencyIds.Equals("0")) 
      { 
       List<int> agencyIds = criteria.AgencyIds.Split(new char[] { ',' }).ToList<int>(); 
       query.CreateAlias("Agencies", "a", NHibernate.SqlCommand.JoinType.InnerJoin); 
       query.Add(Restrictions.In("a.AgencyId", agencyIds)); 

       // Subquery 
       var subqueryCount = query 
        .SetProjection(Projections.CountDistinct("a.AgencyId")) 
        .GetExecutableCriteria(NHibernateSessionManager.Instance.GetSession()) 
        .UniqueResult<int>(); 

       query.Add(Restrictions.Eq(Projections.Count("SpecialismComboId"), subqueryCount)); 
      } 

      ProjectionList pl = Projections.ProjectionList() 
         .AddPropertyAlias("SpecialismComboId", "SpecialismComboId") 
         .AddPropertyAlias("SpecialismComboDisplayText", "SpecialismComboDisplayText") 
         .AddPropertyAlias("SpecialismComboDisciplineDisplayText", "SpecialismComboDisciplineDisplayText") 
         .AddPropertyAlias("SpecialismComboIdText", "SpecialismComboIdText") 
         .Add(Projections.GroupProperty("SpecialismComboId")); 

      total = FullCountQuery(query) 
       .GetExecutableCriteria(NHibernateSessionManager.Instance.GetSession()) 
       .ToRowCount(); 

      // Return the query results 
      return query 
       .SetProjection(Projections.Distinct(pl)) 
       .SetResultTransformer(new KnownPropertyAliasToBeanResultTransformer(typeof(SpecialismCombo))) 
       .SetFirstResult(criteria.FirstRecord) 
       .SetMaxResults(criteria.PageSize) 
       .GetExecutableCriteria(NHibernateSessionManager.Instance.GetSession()) 
       .List<SpecialismCombo>() as List<SpecialismCombo>; 

     } 

     private DetachedCriteria FullCountQuery(DetachedCriteria query) 
     { 
      ProjectionList pl = Projections.ProjectionList() 
         .Add(Projections.GroupProperty("SpecialismComboId")); 
      var subquery = CriteriaTransformer.Clone(query).SetProjection(Projections.Distinct(pl)); 

      return DetachedCriteria.For<SpecialismCombo>("sc") 
       .Add(Subqueries.PropertyIn("sc.SpecialismComboId", subquery)) 
       .SetProjection(Projections.CountDistinct("SpecialismComboId")); 
     } 

我想我得到的ICriteria和预测之类的东西的窍门。但这fullcountquery吹走了:)

Answer 2

AFAIK in ICriteria你不能在FROM子句中指定子查询。

要么返回子计数和客户端总数或求助于HQL或SQL。