Hibernate 對分組聚合支持的不好，例如下面的代碼：

var query = from raqi in session.Query()group raqi by raqi.SpaceKeyinto gselect new {g.Key,Count = g.Count(r => r.Raqi > 1)};

這樣的查尋生成的Sql如下，很明顯是錯誤的，

selectfactstatra0_.[SpaceKey] as col_0_0_,cast(count(*) as INT) as col_1_0_ from[dbo].[FactStatRaqi] factstatra0_ group byfactstatra0_.[SpaceKey]

LinqToSql可以生成正確的sql

-- Region Parameters DECLARE @p0 Float SET @p0 = 1 -- EndRegion SELECT [t1].[SpaceKey] AS [Key], (SELECT COUNT(*)FROM [FactStatRaqi] AS [t2]WHERE ([t2].[RAQI] > @p0) AND ([t1].[SpaceKey] = [t2].[SpaceKey])) AS [Count] FROM (SELECT [t0].[SpaceKey]FROM [FactStatRaqi] AS [t0]GROUP BY [t0].[SpaceKey]) AS [t1]

看來，NH的Linq查尋還有很長的路要走。

轉載于:https://www.cnblogs.com/beginor/archive/2011/03/16/1985956.html

超強干貨來襲 云風專訪：近40年碼齡，通宵達旦的技術人生

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