TL; DR;
NHibernate
Azure-SQL
和MSSQL2012
正在使用SQLite
反向关系,FluentMigrator
说明
我目前正在对我的Asp.Net MVC应用程序进行单元测试,并在SQLite上使用Product
设置我的Unittest。
创建数据库后,我设置了一些我需要的基本条目
其中一个是产品
ProductSuppliers
有很多ProductSupplier
而ProductSupplierPrices
有很多public class Product
{
public virtual long Id { get; set; }
public virtual string Number { get; set; }
public virtual string Name { get; set; }
public virtual string Description { get; set; }
//more properties
public virtual IList<ProductSupplier> Suppliers { get; set; }
//more properties
}
public class ProductSupplier
{
public virtual long Id { get; set; }
public virtual Product Product { get; set; }
public virtual Supplier Supplier { get; set; }
public virtual IList<ProductSupplierPrice> Prices { get; set; }
}
public class ProductSupplierPrice : IHaveId
{
public virtual long Id { get; set; }
public virtual ProductSupplier ProductSupplier { get; set; }
public virtual decimal FromAmount { get; set; }
public virtual decimal Price { get; set; }
}
Product product = this.session.Load<Product>((long)1);
ProductSupplier productSupplier = product.Suppliers.First(); //<-- Suppliers are null; therefore throws an exception
设定:
测试
productSupplierPrice.ProductSupplier <--- Correct Supplier
productSupplier.Prices <-- Null
productSupplier.Product <-- Product with Id 1
product.Suppliers <-- Null
如果我单独加载它们以检查关系:
Azure-SQL
所以对我而言,多对一方向似乎是正确的,但是一对多(反向关系)不起作用。
问题仅存在于我的Unittest(SQLite)中,App本身在public class ProductMap : ClassMap<Product>
{
public ProductMap()
{
Id(x => x.Id);
HasMany(x => x.Suppliers).Inverse().Cascade.DeleteOrphan().BatchSize(20);
//many more mappings
}
}
public ProductSupplierMap()
{
Id(x => x.Id);
References(x => x.Product);
References(x => x.Supplier);
Map(x => x.IsMainSupplier);
Map(x => x.SupplierProductNumber);
Map(x => x.CopperSurcharge);
HasMany(x => x.Prices).Inverse().Cascade.DeleteOrphan().BatchSize(20);
}
public ProductSupplierPriceMap()
{
Id(x => x.Id);
References(x => x.ProductSupplier);
Map(x => x.FromAmount);
Map(x => x.Price);
}
上运行且工作正常。
修改
与FluentnHibernate的映射
Product product = new Product()
{
Type = ProductType.Purchase,
Dispatcher = session.Load<Employee>(employeeId),
Number = "100.10-1000",
Name = "Testproduct",
//Lots of Properties
Suppliers = new List<ProductSupplier>()
};
session.SaveOrUpdate(product);
ProductSupplier productSupplier = new ProductSupplier()
{
Product = product,
Supplier = session.Load<Supplier>((long)1),
IsMainSupplier = true,
SupplierProductNumber = "Artikel123456",
CopperSurcharge = CopperSurchargeType.DEL700,
Prices = new List<ProductSupplierPrice>()
};
session.Save(productSupplier);
ProductSupplierPrice productSupplierPrice = new ProductSupplierPrice()
{
ProductSupplier = productSupplier,
FromAmount = 1,
Price = 5
};
session.Save(productSupplierPrice);
Edit2 - 创建数据库条目:
public static ISession InitializeDatabase()
{
NHibernateSessionHolder.CreateSessionFactory();
session = NHibernateSessionHolder.OpenSession();
CreateBaseEntries(); //Creates Employees, Supplier, Customer etc
return session;
}
编辑3.1:
forcePrincipalAsString
答案 0 :(得分:5)
基于Ayende's article,您需要清除插入/更新和查询之间的会话:
session.Clear();
似乎是一个会话管理,我不确定为什么会话应该是干净的,但是会话提供了你的原始实例(你提供的保存,存储在会话缓存中)而不是lazy的代理 - 负荷。
private long CreatePurchaseOrder()
{
session.Clear();
var product = this.session.Load<Product>((long)1);
var productSupplier = product.Suppliers.First();
var productSupplierPrice = productSupplier.Prices.First();
return 0;
}
答案 1 :(得分:1)
对不起,迟到的回复
在单元测试中,您使用相同的会话来创建和获取实体。这是不对的,因为后续提取会从第一级缓存返回实体,而这些实体没有正确设置其图形。
所以....要么使用不同的会话 OR 作为快速修复,我在“DatabaseSetUpHelper”的方法“InitializeDatabase()”中添加了“session.Clear()”。清除会话将清除第一级缓存并强制NH再次从DB获取数据,并且生成的实体已正确设置其图形。
public static ISession InitializeDatabase()
{
NHibernateSessionHolder.CreateSessionFactory();
session = NHibernateSessionHolder.OpenSession();
CreateBaseEntries();
session.Clear(); // notice this!!! this clears first level cache of session, thus forcing fetching of data from DB
return session;
}
注意:我的快速修复不是最终解决方案,它只是显示会话的行为方式。在适当的解决方案中,您必须使用不同的会话