c# - NHibernate QueryOver 复杂查询

Question

我目前正在研究 ac#、MVC3、NHibernate（在 MSSQL 2008 上）应用程序。我将提供一个简化的示例，因为我认为这是理解这一点的最佳方式。

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;}
}

我的最终目标是生成一个包含以下内容的列表：

产品名称、公司名称、国家名称、州名称、当前库存数量、入库库存数量、出库库存数量

我可以使用以下查询对当前股票执行此操作：

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>();

我坚持的是如何根据 TransactionHeader / TransactionRow 数据添加进出库存。这是我尝试获取传入库存编号的查询：

            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))

按多个属性分组似乎不起作用：

 Could not determine member from new <>f__AnonymousType3`2(ToCompany = value(<Stuff>).ith.ToCompany, Product = value(<Stuff>).itr.Product)

所以这让我想到了两个问题：

我对这整件事做错了吗？存储过程会是更好的解决方案吗？
如果这种方法很好，那么如何按多个字段分组？

编辑：我想要生成的那种 SQL 的例子：

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

编辑 2：所需 SQL 的第二个版本

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

score 0 · Accepted Answer

非常感谢 Andrew，他促使我写出 SQL，从而弄清楚了这一点。

我在设置方面缺少一些东西：

公司需要两个额外的属性：

public virtual IList<TransactionHeader> TransactionsFromCompany { get; set; }
public virtual IList<TransactionHeader> TransactionsToCompany { get; set; }

我的自动映射需要被覆盖以将这些映射到适当的列：

.Override<Company>(m =>
{
    m.HasMany(c => c.TransactionsFromCompany)
        .KeyColumn("FromCompany");
    m.HasMany(c => c.TransactionsToCompany)
        .KeyColumn("ToCompany");
}

现在我可以编写查询：

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();

c# - NHibernate QueryOver 复杂查询

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