我们正在努力解决以下问题。我们选择的ORM解决方案是NHibernate，我们希望使用QueryOver样式编写查询。现在有一个新的难题需要解决，我们想要进行如下查询：
select sp.Id, SUM(p.PriceAmount), SUM(i.BruttoAmount) from SellerProfile sp
left join SellerProfile_Invoice spi on spi.SellerProfile = sp.Id
left join Invoice i on spi.Invoice = i.Id
left join SellerProfile_Payment spp on spp.SellerProfile = sp.Id
left join Payment p on spp.Payment = p.Id
where i.PaymentDate < '2011-07-12'
group by sp.Id
having SUM(ISNULL(p.PriceAmount,0)) - SUM(ISNULL(i.BruttoAmount,0)) < 0
所以我们编写了这样的代码：
Invoice invoice = null;
Payment payment = null;
SellerProfile seller = null;
var sellerIds = Session.QueryOver<SellerProfile>(() => seller)
.Left.JoinQueryOver(() => seller.Payments, () => payment)
.Left.JoinQueryOver(() => seller.Invoices, () => invoice)
.Where(() => invoice.PaymentDate < DateTime.Now - timeSpan)
.Select(Projections.Group(() => seller.Id))
.Where(Restrictions.Lt(new ArithmeticOperatorProjection("-", NHibernateUtil.Decimal, Projections.Sum(() => payment.Price.Amount), Projections.Sum(() => invoice.Brutto.Amount)), 0)).List<int>();
生成的SQL如下所示：
SELECT this_.Id as y0_
FROM SellerProfile this_ inner join ResourceOwner this_1_ on this_.Id=this_1_.Id
inner join Resource this_2_ on this_.Id=this_2_.Id
left outer join SellerProfile_Payment payments4_ on this_.Id=payments4_.SellerProfile
left outer join Payment payment2_ on payments4_.Payment=payment2_.Id
left outer join SellerProfile_Invoice invoices6_ on this_.Id=invoices6_.SellerProfile
left outer join Invoice invoice1_ on invoices6_.Invoice=invoice1_.Id
WHERE invoice1_.PaymentDate < @p0
and (sum(payment2_.PriceAmount) - sum(invoice1_.BruttoAmount)) < @p1
GROUP BY this_.Id
但它抛出异常，因为它在最后一行将and子句放到第一个where而不是having，而我们的SQL不起作用......
有任何帮助吗？感谢...