Nhibernate按倍数和计数分组

首先，我知道GroubBy的多个属性尚未实现

我想做的是

SELECT count(*)
FROM ( 
    SELECT this_.SubmissionDate as y0_
    FROM   [Coupon] this_
    WHERE  this_.PaymentOrder_id is null 
    GROUP BY this_.SubmissionDate,
           this_.Deal_id
) AS query

我在Nhibernate最好的是

Session.QueryOver<Coupon>().Select(Projections.Group<Coupon>(e => e.SubmissionDate),Projections.Group<Coupon>(e => e.Deal.Id)).Future<object[]>().Count()

更多例外

[QuerySyntaxException: Exception of type 'Antlr.Runtime.NoViableAltException' was thrown. near line 1, column 21]
   NHibernate.Hql.Ast.ANTLR.ErrorCounter.ThrowQueryException() +118
   NHibernate.Hql.Ast.ANTLR.HqlParseEngine.Parse() +416

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你有没有试过这样的方法，可以在记忆中计数

var count = Session.CreateQuery("select c.SubmissionDate from Coupon c where c.PaymentOrder.Id is null group by c.SubmissionDate, c.Deal.Id").ToList().Count;

HQL似乎不支持select和where之外的子查询：

---

否则，您可以创建一个存储过程，并将其添加到映射中：

运行它时会发生什么？Antlr异常似乎是由于HQL语法不正确造成的。请参阅：。异常是否像上面的链接中那样由QuerySyntaxException包装？我很确定是子选择导致的！但我不知道这会不会返回整个结果集并在内存中计算它们？

[QuerySyntaxException: Exception of type 'Antlr.Runtime.NoViableAltException' was thrown. near line 1, column 21]
   NHibernate.Hql.Ast.ANTLR.ErrorCounter.ThrowQueryException() +118
   NHibernate.Hql.Ast.ANTLR.HqlParseEngine.Parse() +416

var count = Session.CreateQuery("select c.SubmissionDate from Coupon c where c.PaymentOrder.Id is null group by c.SubmissionDate, c.Deal.Id").ToList().Count;