[英]NHibernate QueryOver complex query
我目前正在處理ac#,MVC3,NHibernate(在MSSQL 2008上)應用程序。 我將提供一個簡化的示例,因為我認為這是理解這一點的最佳方法。
楷模:
class Stock
{
public Company Company {get;set;}
public Product Product {get;set;}
public int quantity {get;set;}
}
class TransactionHeader
{
public Company FromCompany {get;set;}
public Company ToCompany {get;set;}
public IList<TransactionRow> Rows {get;set;}
}
class TransactionRows
{
public Product Product {get;set;}
public TransactionHeader Header {get;set;}
public int Quantity {get;set;}
}
class Company
{
public Country Country {get;set;}
public State State {get;set;}
public string Name {get;set;}
}
我的最終目標是產生一個包含以下內容的列表:
產品名稱,公司名稱,國家/地區名稱,州名稱,當前庫存數量,進貨庫存數量,待發貨庫存數量
我可以使用此查詢針對當前庫存執行此操作:
var stockQuery = session.QueryOver<Stock>(() => s)
.JoinAlias<Company>(() => s.company, () => c, NHibernate.SqlCommand.JoinType.InnerJoin, null)
.JoinAlias<State>(() => c.State, () => state, NHibernate.SqlCommand.JoinType.InnerJoin, null)
.JoinAlias<Country>(() => c.Country, () => country, NHibernate.SqlCommand.JoinType.InnerJoin, null)
.JoinAlias<Product>(() => s.product, () => p, NHibernate.SqlCommand.JoinType.InnerJoin, null);
if (productId.HasValue) { stockQuery = stockQuery.Where(() => p.Id == productId); }
var stock = stockQuery.SelectList(list => list
.Select(() => s.currentStock).WithAlias(() => rowVM.CurrentStock)
.Select(() => c.Description).WithAlias(() => rowVM.CompanyName)
.Select(() => state.Description).WithAlias(() => rowVM.StateName)
.Select(() => country.Description).WithAlias(() => rowVM.CountryName)
.Select(() => p.Description).WithAlias(() => rowVM.ProductName))
.TransformUsing(Transformers.AliasToBean<StockLevelRowVM>())
.List<StockLevelRowVM>();
我要堅持的是如何基於TransactionHeader / TransactionRow數據添加進來和去庫存的股票。 這是我嘗試查詢來料編號的方法:
var incommingQuery = session.QueryOver<TransactionRow>(() => itr)
.JoinAlias<TransactionHeader>(() => itr.TransactionHeader, () => ith, NHibernate.SqlCommand.JoinType.InnerJoin, null)
.JoinAlias<Company>(() => ith.ToCompany, () => c, NHibernate.SqlCommand.JoinType.InnerJoin, null)
.JoinAlias<Product>(() => itr.Product, () => p, NHibernate.SqlCommand.JoinType.InnerJoin, null)
.SelectList(list => list
.SelectGroup(() => new { ith.ToCompany, itr.Product })
.Select(() => itr.Quantity).WithAlias(() => detail.Quantity)
.Select(() => p.Id).WithAlias(() => detail.ProductId)
.Select(() => c.Id).WithAlias(() => detail.CompanyId))
按多個屬性分組似乎不起作用:
Could not determine member from new <>f__AnonymousType3`2(ToCompany = value(<Stuff>).ith.ToCompany, Product = value(<Stuff>).itr.Product)
因此,這引出了兩個問題:
編輯:我想生成的那種SQL的示例:
SELECT c.Description CompanyName,
p.Description ProductName,
cc.Description CountryName,
cs.Description StateName,
tmp.CurrentStock,
tmp.OutgoingStock,
tmp.IncommingStock
FROM
(
SELECT results.CompanyId,
results.ProductId,
SUM(results.CurrentStock) CurrentStock,
SUM(results.IncommingStock) IncommingStock,
SUM(results.OutgoingStock) OutgoingStock
FROM (
SELECT
c.Id CompanyId,
p.Id ProductId,
s.CurrentStock,
0 IncommingStock,
0 OutgoingStock
FROM Stock s
INNER JOIN Company c ON c.Id = s.Company
INNER JOIN [State] cs ON cs.Id = c.[State]
INNER JOIN Country cc ON cc.Id = cs.Country
INNER JOIN Product p ON p.Id = s.Product
WHERE (@CompanyId IS NULL OR c.Id = @CompanyId) AND
(@CountryId IS NULL OR cc.Id = @CountryId) AND
(@StateId IS NULL OR cs.Id = @StateId) AND
(@ProductId IS NULL OR p.Id = @ProductId)
UNION
SELECT
c.Id CompanyId,
p.Id ProductId,
0 CurrentStock,
0 IncommingStock,
tr.Quantity OutgoingStock
FROM TransactionRow tr
INNER JOIN TransactionHeader th ON th.Id = tr.TransactionHeader
INNER JOIN Company c ON c.Id = th.FromCompany
INNER JOIN [State] cs ON cs.Id = c.[State]
INNER JOIN Country cc ON cc.Id = cs.Country
INNER JOIN Product p ON p.Id = tr.Product
WHERE (@CompanyId IS NULL OR c.Id = @CompanyId) AND
(@CountryId IS NULL OR cc.Id = @CountryId) AND
(@StateId IS NULL OR cs.Id = @StateId) AND
(@ProductId IS NULL OR p.Id = @ProductId)
UNION
SELECT
c.Id CompanyId,
p.Id ProductId,
0 CurrentStock,
tr.Quantity IncommingStock,
0 OutgoingStock
FROM TransactionRow tr
INNER JOIN TransactionHeader th ON th.Id = tr.TransactionHeader
INNER JOIN Company c ON c.Id = th.ToCompany
INNER JOIN [State] cs ON cs.Id = c.[State]
INNER JOIN Country cc ON cc.Id = cs.Country
INNER JOIN Product p ON p.Id = tr.Product
WHERE (@CompanyId IS NULL OR c.Id = @CompanyId) AND
(@CountryId IS NULL OR cc.Id = @CountryId) AND
(@StateId IS NULL OR cs.Id = @StateId) AND
(@ProductId IS NULL OR p.Id = @ProductId)
) results
GROUP BY results.CompanyId, results.ProductId
) tmp
INNER JOIN Company c ON c.Id = tmp.CompanyId
INNER JOIN [State] cs ON cs.Id = c.[State]
INNER JOIN Country cc ON cc.Id = cs.Country
INNER JOIN Product p ON p.Id = tmp.CompanyId
編輯2:所需SQL的第二版
SELECT
c.Id CompanyId,
c.Description CompanyName,
p.Id ProductId,
p.Description ProductName,
cs.Description StateName,
cc.Description CountryName,
SUM(s.CurrentStock) CurrentStock,
SUM(ttr.Quantity) IncommingStock,
SUM(ftr.Quantity) OutgoingStock
FROM Stock s
INNER JOIN Company c ON c.Id = s.Company
INNER JOIN [State] cs ON cs.Id = c.[State]
INNER JOIN Country cc ON cc.Id = cs.Country
INNER JOIN Product p ON p.Id = s.Product
LEFT JOIN TransactionHeader fth ON fth.FromCompany = c.Id
LEFT JOIN TransactionRow ftr ON ftr.TransactionHeader = fth.ID
AND ftr.Product = p.Id
LEFT JOIN TransactionHeader tth ON tth.ToCompany = c.Id
LEFT JOIN TransactionRow ttr ON ttr.TransactionHeader = tth.ID
AND ttr.Product = p.Id
WHERE (@CompanyId IS NULL OR c.Id = @CompanyId) AND
(@CountryId IS NULL OR cc.Id = @CountryId) AND
(@StateId IS NULL OR cs.Id = @StateId) AND
(@ProductId IS NULL OR p.Id = @ProductId)
GROUP BY p.Id, c.Id, c.Description, p.Description,
cs.Description, cc.Description
非常感謝Andrew,他促使我寫出SQL,從而弄清楚了這個SQL。
我缺少一些明智的設置方法:
公司需要兩個額外的屬性:
public virtual IList<TransactionHeader> TransactionsFromCompany { get; set; } public virtual IList<TransactionHeader> TransactionsToCompany { get; set; }
我的自動映射需要重寫以將它們映射到適當的列:
.Override<Company>(m => { m.HasMany(c => c.TransactionsFromCompany) .KeyColumn("FromCompany"); m.HasMany(c => c.TransactionsToCompany) .KeyColumn("ToCompany"); }
現在我可以編寫查詢:
StockLevelRowVM rowVM = null; Stock s = null; Company c = null; State state = null; Country country = null; Product p = null; TransactionHeader ith = null; TransactionRow itr = null; TransactionHeader oth = null; TransactionRow otr = null; var stockQuery = session.QueryOver<Stock>(() => s) .JoinAlias<Company>(() => s.company, () => c, NHibernate.SqlCommand.JoinType.InnerJoin, null) .JoinAlias<State>(() => c.State, () => state, NHibernate.SqlCommand.JoinType.InnerJoin, null) .JoinAlias<Country>(() => c.Country, () => country, NHibernate.SqlCommand.JoinType.InnerJoin, null) .JoinAlias<Product>(() => s.product, () => p, NHibernate.SqlCommand.JoinType.InnerJoin, null) .JoinAlias<TransactionHeader>(() => c.TransactionsFromCompany, () => oth, NHibernate.SqlCommand.JoinType.LeftOuterJoin, null) .JoinAlias<TransactionRow>(() => oth.Rows, () => otr, NHibernate.SqlCommand.JoinType.LeftOuterJoin, null) .JoinAlias<TransactionHeader>(() => c.TransactionsToCompany, () => ith, NHibernate.SqlCommand.JoinType.LeftOuterJoin, null) .JoinAlias<TransactionRow>(() => ith.Rows, () => itr, NHibernate.SqlCommand.JoinType.LeftOuterJoin, null); if (productId.HasValue) { stockQuery = stockQuery.Where(() => p.Id == productId); } if (companyId.HasValue) { stockQuery = stockQuery.Where(() => c.Id == companyId); } if (stateId.HasValue) { stockQuery = stockQuery.Where(() => state.Id == stateId); } if (countryId.HasValue) { stockQuery = stockQuery.Where(() => country.Id == countryId); } <call generic paging methods for IQueryOver> result = stockQuery.SelectList(list => list .SelectGroup(() => c.Id) .SelectGroup(() => p.Id) .SelectGroup(() => c.Description).WithAlias(() => rowVM.CompanyName) .SelectGroup(() => state.Description).WithAlias(() => rowVM.StateName) .SelectGroup(() => country.Description).WithAlias(() => rowVM.CountryName) .SelectGroup(() => p.Description).WithAlias(() => rowVM.ProductName) .SelectSum(() => s.currentStock).WithAlias(() => rowVM.CurrentStock) .SelectSum(() => otr.Quantity).WithAlias(() => rowVM.OutgoingStock) .SelectSum(() => itr.Quantity).WithAlias(() => rowVM.IncommingStock)) .TransformUsing(Transformers.AliasToBean<StockLevelRowVM>()) .List<StockLevelRowVM>().ToList();
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