Nhibernate 有限制的投影.交叉点

带有Restrictions.Discjunction（）或Restrictions.or（）的投影将生成WHERE子句，而不是HAVING子句。这将导致错误（WHERE子句不能引用聚合表达式）

例如：

.CreateCriteria(typeof(SalesOrderLine), "SOL")
.CreateCriteria("DeliveryOrderLines", "DOL", JoinType.LeftOuterJoin)
.SetProjection(
    Projections.GroupProperty("SOL.Key").As("SalesOrderLineId"),
    Projections.GroupProperty("SOL.Item"),
    Projections.GroupProperty("SOL.Description"),
    Projections.GroupProperty("SOL.UnitPrice"),
    Projections.GroupProperty("SOL.Quantity"),
    Projections.GroupProperty("SOL.DiscountPercentage"),
    Projections.GroupProperty("SOL.SalesOrder"))
.Add(Restrictions.Or(
    Restrictions.IsNull(Projections.Sum("DOL.Quantity")),
    Restrictions.GtProperty("SOL.Quantity", Projections.Sum("DOL.Quantity")))), 
.List();

SQL结果：

SELECT this_.SalesOrderLineId as y0_, this_.Item as y1_, this_.Description as y2_, this_.UnitPrice as y3_, this_.Quantity as y4_, this_.DiscountPercentage as y5_, this_.SalesOrderId as y6_ FROM SalesOrderLine this_ left outer join DeliveryOrderLine dol1_ on this_.SalesOrderLineId=dol1_.SalesOrderLineId 
WHERE (sum(dol1_.Quantity) is null or this_.Quantity > sum(dol1_.Quantity))
GROUP BY this_.SalesOrderLineId, this_.Item, this_.Description, this_.UnitPrice, this_.Quantity, this_.DiscountPercentage, this_.SalesOrderId

我做错了吗？或者这是Nhibernate 3.1中的一个bug

---

提前感谢：）。

上次我检查时，Criteria API不支持HAVING子句。您需要使用HQL，它确实支持

要与Criteria API一起使用，您必须将查询修改为：

SELECT this_.SalesOrderLineId as y0_, this_.Item as y1_, this_.Description as y2_, this_.UnitPrice as y3_, this_.Quantity as y4_, this_.DiscountPercentage as y5_, this_.SalesOrderId as y6_ FROM SalesOrderLine this_ left outer join DeliveryOrderLine dol1_ on this_.SalesOrderLineId=dol1_.SalesOrderLineId 
WHERE (select sum(Quantity) from DeliveryOrderLine) is null or (select sum(Quantity) from > SalesOrderLine ) > (select sum(Quantity) from DeliveryOrderLine)
GROUP BY this_.SalesOrderLineId, this_.Item, this_.Description, this_.UnitPrice, this_.Quantity, this_.DiscountPercentage, this_.SalesOrderId

我给出的解决方案会因为多次求和计算而对性能造成一些影响，但它会完成任务

您也可以试试这个，但我不确定它是否能正确运行：

SELECT this_.SalesOrderLineId as y0_, this_.Item as y1_, this_.Description as y2_, this_.UnitPrice as y3_, this_.Quantity as y4_, this_.DiscountPercentage as y5_, this_.SalesOrderId as y6_, SUM(dol1_Quantity) as sum1, SUM(this_.Quantity) as sum2 from SalesOrderLine this_ left outer join DeliveryOrderLine dol1_ on this_.SalesOrderLineId=dol1_.SalesOrderLineId 
WHERE sum1 is null or sum1 > sum2
GROUP BY this_.SalesOrderLineId, this_.Item, this_.Description, this_.UnitPrice, this_.Quantity, this_.DiscountPercentage, this_.SalesOrderId

---

希望这有帮助

谢谢你，瓦伦！性能在这里很重要，所以我不能使用您的第一个标准API解决方案。你能告诉我你的第二个解决方案吗？我试着给我的投影加上别名，但由于限制，我无法使用它。