这是我遇到的问题。 我有一个包含100多条记录的数据库。 我正在翻阅数据，一次获得9个结果。 当我添加一个检查以查看项目是否处于活动状态时，它会导致结果开始加倍。
一点背景： “产品”是实际的产品系列 “ProductSkus”是产品系列中存在的实际产品 当Product中有超过1个ProductSku时，它会导致返回重复的条目。
请参阅下面的NHibernate查询：
result = this.Session.CreateCriteria<Model.Product>()
.Add(Expression.Eq("IsActive", true))
.AddOrder(new Order("Name", true))
.SetFirstResult(indexNumber).SetMaxResults(maxNumber)
// This part of the query duplicates the products
.CreateAlias("ProductSkus", "ProdSkus", JoinType.InnerJoin)
.Add(Expression.Eq("ProdSkus.IsActive", true))
.CreateAlias("ProductToSubcategory", "ProdToSubcat")
.CreateAlias("ProdToSubcat.ProductSubcategory", "ProdSubcat")
.Add(Expression.Eq("ProdSubcat.ID", subCatId))
// This part takes out the duplicate products - Removes too many items...
// Turns out that with .SetFirstResult(indexNumber).SetMaxResults(maxNumber)
// it gets 9 records back then the duplicates are removed.
// Example:
// Total Records over 100
// Max = 9
// 4 Duplicates removed
// Yields 5 records when there should be 9
// Why??? This line is ran in NHibernate on the data after it has been extracted from the SQL server.
.SetResultTransformer(new NHibernate.Transform.DistinctRootEntityResultTransformer())
.List<Model.Product>();
我添加了DistinctRootEntityResultTransformer来清理重复项。问题在于它将包含重复的9条记录拉回来。然后DistinctRootEntityResultTransformer清除9条记录中的重复项。我基本上需要在SQL服务器上运行一个独特的语句来开始。
然而，由于NHibernate默认希望在语句的select部分中的每个表中添加每个字段，因此SQL上的不同之处不起作用。我只使用属于根表的字段开始（Model.Product）。如果我可以告诉NHibernate不要将连接表中的字段添加到语句的选择部分并添加Distinct，那么它将起作用。
我使用NHibernare Profiler查看实际查询：
SELECT top 9 this_.ID as ID351_3_,
this_.Name as Name351_3_,
this_.Description as Descript3_351_3_,
this_.IsActive as IsActive351_3_,
this_.ManufacturerID as Manufact5_351_3_,
prodskus1_.ID as ID373_0_,
prodskus1_.Description as Descript2_373_0_,
prodskus1_.PartNumber as PartNumber373_0_,
prodskus1_.Price as Price373_0_,
prodskus1_.IsKit as IsKit373_0_,
prodskus1_.IsActive as IsActive373_0_,
prodskus1_.IsFeaturedProduct as IsFeatur7_373_0_,
prodskus1_.DateAdded as DateAdded373_0_,
prodskus1_.Weight as Weight373_0_,
prodskus1_.TimesViewed as TimesVi10_373_0_,
prodskus1_.TimesOrdered as TimesOr11_373_0_,
prodskus1_.ProductID as ProductID373_0_,
prodskus1_.OverSizedBoxID as OverSiz13_373_0_,
prodtosubc2_.ID as ID362_1_,
prodtosubc2_.MasterSubcategory as MasterSu2_362_1_,
prodtosubc2_.ProductID as ProductID362_1_,
prodtosubc2_.ProductSubcategoryID as ProductS4_362_1_,
prodsubcat3_.ID as ID352_2_,
prodsubcat3_.Name as Name352_2_,
prodsubcat3_.ProductCategoryID as ProductC3_352_2_,
prodsubcat3_.ImageID as ImageID352_2_,
prodsubcat3_.TriggerShow as TriggerS5_352_2_
FROM Product this_
inner join ProductSku prodskus1_
on this_.ID = prodskus1_.ProductID
and (prodskus1_.IsActive = 1)
inner join ProductToSubcategory prodtosubc2_
on this_.ID = prodtosubc2_.ProductID
inner join ProductSubcategory prodsubcat3_
on prodtosubc2_.ProductSubcategoryID = prodsubcat3_.ID
WHERE this_.IsActive = 1 /* @p0 */
and prodskus1_.IsActive = 1 /* @p1 */
and prodsubcat3_.ID = 3 /* @p2 */
ORDER BY this_.Name asc
如果我手动修改查询并直接在SQL服务器上运行，我会得到我想要的结果集（我删除了select部分中的所有额外字段并添加了DISTINCT）：
SELECT DISTINCT top 9 this_.ID as ID351_3_,
this_.Name as Name351_3_,
this_.Description as Descript3_351_3_,
this_.IsActive as IsActive351_3_,
this_.ManufacturerID as Manufact5_351_3_,
FROM Product this_
inner join ProductSku prodskus1_
on this_.ID = prodskus1_.ProductID
and (prodskus1_.IsActive = 1)
inner join ProductToSubcategory prodtosubc2_
on this_.ID = prodtosubc2_.ProductID
inner join ProductSubcategory prodsubcat3_
on prodtosubc2_.ProductSubcategoryID = prodsubcat3_.ID
WHERE this_.IsActive = 1 /* @p0 */
and prodskus1_.IsActive = 1 /* @p1 */
and prodsubcat3_.ID = 3 /* @p2 */
ORDER BY this_.Name asc
我现在必须要问的一个重要问题是......
我必须在NHibernate Query中更改哪些内容才能获得完全相同的结果？
提前致谢。