Nhibernate 交易日最后4家供应商的产品
嗨,我有这个sql,必须翻译成NHibernate QueryOverNhibernate 交易日最后4家供应商的产品,nhibernate,subquery,queryover,correlated-subquery,Nhibernate,Subquery,Queryover,Correlated Subquery,嗨,我有这个sql,必须翻译成NHibernate QueryOver SELECT S.Number, S.Description, S.BrandDescription, subquery.vendornumber, subquery.vendorname FROM Stocks.Stock S left join (select vendorNumber, VendorName, POLID, LastTransactionDate from
SELECT S.Number, S.Description, S.BrandDescription, subquery.vendornumber, subquery.vendorname
FROM Stocks.Stock S left join
(select vendorNumber, VendorName, POLID, LastTransactionDate from
(
SELECT top 4 v.Number vendorNumber, v.Name VendorName, PLL.Id POLID, max(por.TransactionDate) as LastTransactionDate,
ROW_NUMBER() OVER(PARTITION BY v.Number ORDER BY max(por.TransactionDate) DESC) AS rk
FROM Purchasing.PurchaseOrderLineItem PLL
inner join Purchasing.PurchaseOrder po on PLL.PurchaseOrderId = po.Id
inner join Purchasing.PurchaseOrderVendor POV on po.Id = POV.PurchaseOrderId
inner join Purchasing.Vendor V on pov.VendorId = v.Id
left outer join Purchasing.PurchaseOrderReceipt POR on PLL.Id = por.PurchaseOrderLineItemId
group by v.Number, v.Name,PLL.Id
order by LastTransactionDate desc
) subquery
where subquery.rk = 1) B on PL.Id = b.POLID
或者只是简单地解释一下,看看它的简化版本
Select * from master m
outer apply (select top 4 * From Details d where m.Id = d.Id order by someColumns desc)o
我认为我们不能在nhibernate中将子查询用作派生表。如果你有建议,请分享
谢谢我一直在研究这个问题,发现如果想完全使用QueryOver,可能会非常困难。我想展示一下我是如何做到这一点的 首先,我让所有具有StockID的供应商稍后加入StockQuery
var stockVendors =
Session.QueryOver<Vendor>(() => V)
.Left.JoinQueryOver(p => V.Stock, () => sstk)
.Where(sstk.Number !=null)
.OrderBy(Projections.Max(() => V.TransactionDate)).Desc()
.ThenBy(() => sstk.Number).Asc()
.ThenBy(() => sv.Number).Asc()
.SelectList(
lst =>
lst.SelectGroup(() => V.Name).WithAlias(() => svhModal.VendorName)
.SelectGroup(() => V.Number).WithAlias(() => svhModal.VendorNumber)
.SelectGroup(() => sstk.Number).WithAlias(() => svhModal.StockNumber)
.Select(Projections.Max(() => V.TransactionDate)).WithAlias(() => svhModal.LastTransactionDate)
var库存供应商=
Session.QueryOver(()=>V)
.Left.JoinQueryOver(p=>V.Stock,()=>sstk)
.Where(sstk.Number!=null)
.OrderBy(Projections.Max(()=>V.TransactionDate)).Desc()
.ThenBy(()=>sstk.Number).Asc()
.ThenBy(()=>sv.Number).Asc()
.选择列表(
lst=>
lst.SelectGroup(()=>V.Name)。带别名(()=>svhModal.VendorName)
.SelectGroup(()=>V.Number)。带别名(()=>svhModal.VendorNumber)
.SelectGroup(()=>sstk.Number)。带别名(()=>svhModal.StockNumber)
.Select(projects.Max(()=>V.TransactionDate)).with别名(()=>svhModal.LastTransactionDate)
)
.TransformUsing(Transformers.AliasToBean()).List()
然后只选择股票
var stockDetail = Session.QueryOver<Stock>(() => stk)
.Where(soneCriteria)
.SelectList(list => list
.Select(() => stk.Id).WithAlias(() => sdrModal.Id)
.Select(() => stk.Number).WithAlias(() => sdrModal.Number)
.TransformUsing(Transformers.AliasToBean<StockDetailReportModal>())
.List<StockDetailReportModal>();
IList<StockVendor> vlst2 = null;
IList<StockDetail> newStock = new List<StockDetail>();
var stockDetail=Session.QueryOver(()=>stk)
.何处(索尼克里特里亚)
.SelectList(list=>list
.选择(()=>stk.Id)。使用别名(()=>sdrmodel.Id)
。选择(()=>stk.Number)。使用别名(()=>sdrmodel.Number)
.TransformUsing(Transformers.AliasToBean())
.List();
IList vlst2=null;
IList newStock=新列表();
这里启动两个循环,用每个库存及其供应商列表中的5个顶级供应商填充列表对象。从查询的Stockdetail结果循环,从筛选的供应商结果到外部循环stockid的内部循环,仅在循环中获取前5个供应商,完成后将结果返回报告。工作正常
foreach(StockDetail中的StockDetail ostk)
{
stkid=ostk.编号;
vlst2=(从stockVendors中的v开始,其中v.StockNumber==stkid orderby v.LastTransactionDate降序选择v);
vndrcnt=0;
stok=新库存详细信息
{
Id=ostk.Id,
编号=ostk.Number,
////其他领域也在这里
};
if(vlst2.Count()==0)
{
添加(stok);
}
foreach(vlst2中的库存供应商vn)
{
如果(vndrcnt==0)
{
stok.VendorName=vn.VendorName;
stok.VendorNumber=vn.VendorNumber;
//这里的其他领域。。。
添加(stok);
}
其他的
{
newStock.Add(新股票详细信息)
{
Id=ostk.Id,
编号=ostk.Number,
VendorName=vn.VendorName,
VendorNumber=vn.VendorNumber,
//在库存记录中添加供应商信息。
});
}
vndrcnt++;
如果(vndrcnt>=4)
打破
}
这解决了我的问题,并且在调查了许多天之后实现了这一点。您可能会找到更好的方法,因此请分享。简单地说,NHibernate FROM是通过类/实体映射定义的,JOIN是通过引用映射定义的。因此上述SQL查询将无法工作。这里的解决方案是:1)创建视图-并封装所有的复杂性-将其映射为实体2)使用原始SQL查询来获取这些数据。任何其他解决方案都不适合通用ORM感谢@RadimKöhler的回复。我已经完成了一个存储过程,该过程工作正常,但由于安全限制,我的老板拒绝NHibernate映射实体之外的任何事情。我还尝试创建两个单独的查询结果并合并或联接以满足此要求。有什么想法或建议吗?我会尝试使用任何一个视图,然后将其映射为实体,或者使用一些“C#”组合-正如你所说的。但问题是,你必须创建的这种复杂查询超出了ORM世界的能力范围…抱歉,没有更好的答案…再次感谢。至少我可以向我的老板和团队展示这个回复,他们认为NHibernate中的一切都是可能的,而且比SQL简单得多。我是唯一的p这里的erson可以编写复杂的SQL,这对我来说是个大问题。
foreach (StockDetail ostk in stockDetail)
{
stkid = ostk.Number;
vlst2 = (from v in stockVendors where v.StockNumber == stkid orderby v.LastTransactionDate descending select v).ToList<StockVendor>();
vndrcnt = 0;
stok = new StockDetail
{
Id = ostk.Id,
Number = ostk.Number,
//// other fields too here
};
if (vlst2.Count() == 0)
{
newStock.Add(stok);
}
foreach (StockVendor vn in vlst2)
{
if (vndrcnt == 0)
{
stok.VendorName = vn.VendorName;
stok.VendorNumber = vn.VendorNumber;
// other fields here...
newStock.Add(stok);
}
else
{
newStock.Add(new StockDetail
{
Id = ostk.Id,
Number = ostk.Number,
VendorName = vn.VendorName,
VendorNumber = vn.VendorNumber,
// adding vendor information in stock record.
});
}
vndrcnt++;
if (vndrcnt >= 4)
break;
}