我有一个标准查询:
Session.CreateCriteria<Sell043Report>()
.SetProjection(.ProjectionList()
.Add(LambdaProjection.GroupProperty<Sell043Report>(r => r.location))
.Add(LambdaProjection.GroupProperty<Sell043Report>(r => r.agent))
.Add(LambdaProjection.GroupProperty<Sell043Report>(r => r.cusip))
.Add(LambdaProjection.GroupProperty<Sell043Report>(r => r.SettlementDate))
.Add(LambdaProjection.GroupProperty<Sell043Report>(r => r.salePrice))
.Add(LambdaProjection.GroupProperty<Sell043Report>(r => r.foreignFx))
.Add(LambdaProjection.GroupProperty<Sell043Report>(r => r.batchNumber))
.Add(LambdaProjection.GroupProperty<Sell043Report>(r => r.origSaleDate))
.Add(LambdaProjection.GroupProperty<Sell043Report>(r => r.planName))
.Add(LambdaProjection.GroupProperty<Sell043Report>(r => r.dateTimeAdded))
.Add(LambdaProjection.Sum<Sell043Report>(r => r.shares))
.Add(LambdaProjection.Sum<Sell043Report>(r => r.netMoney))
.Add(LambdaProjection.Sum<Sell043Report>(r => r.grossMoney))
.Add(LambdaProjection.Sum<Sell043Report>(r => r.taxWithheld))
.Add(LambdaProjection.Sum<Sell043Report>(r => r.fees)))
.List<Sell043Report>();
生成以下SQL:
SELECT
this_.location as y0_,
this_.agent as y1_,
this_.cusip as y2_,
this_.SettlementDate as y3_,
this_.salePrice as y4_,
this_.foreignFx as y5_,
this_.batchNumber as y6_,
this_.origSaleDate as y7_,
this_.planName as y8_,
this_.dateTimeAdded as y9_,
sum(this_.shares) as y10_,
sum(this_.netMoney) as y11_,
sum(this_.grossMoney) as y12_,
sum(this_.taxWithheld) as y13_,
sum(this_.fees) as y14_
FROM
MIS_IPS_Sell043Report this_
GROUP BY
this_.location,
this_.agent,
this_.cusip,
this_.SettlementDate,
this_.salePrice,
this_.foreignFx,
this_.batchNumber,
this_.origSaleDate,
this_.planName,
this_.dateTimeAdded
然而,Sell043Report表有比SELECT语句中列出的列更多的列,所以我在尝试获取Sell043Reports列表时收到此错误:
System.ArgumentException: The value "System.Object[]" is not of type "xyz.Sell043Report" and cannot be used in this generic collection.
我怀疑问题是我没有为Sell043Report选择所有列,因此它不知道如何将数据集映射到对象。我正在努力实现这样的目标:
SELECT
this_.location as y0_,
this_.agent as y1_,
this_.cusip as y2_,
this_.SettlementDate as y3_,
this_.salePrice as y4_,
this_.foreignFx as y5_,
this_.batchNumber as y6_,
this_.origSaleDate as y7_,
this_.planName as y8_,
this_.dateTimeAdded as y9_,
sum(this_.shares) as y10_,
sum(this_.netMoney) as y11_,
sum(this_.grossMoney) as y12_,
sum(this_.taxWithheld) as y13_,
sum(this_.fees) as y14_,
'' as Address1,
'' as Address2 // etc
FROM
MIS_IPS_Sell043Report this_
GROUP BY
this_.location,
this_.agent,
this_.cusip,
this_.SettlementDate,
this_.salePrice,
this_.foreignFx,
this_.batchNumber,
this_.origSaleDate,
this_.planName,
this_.dateTimeAdded
如何使用NHibernate执行此操作?
答案 0 :(得分:3)
在调用.List&lt;&gt;():
之前,你可能想要这样的东西SetResultTransformer(Transformers.AliasToBean(typeof运算(结果)))
其中Result是一个新类,用于存储所需的列子集。
另见这个问题:
您得到的错误是因为没有调用SetResultTransformer,它想要返回一个对象数组。然后(无意中)您尝试将该对象数组转换为Sell043Report对象列表,这是不可能的。
您的另一个选择是删除对List&lt;&gt;()的调用,而是处理对象数组。