鉴于这些课程:
using System.Collections.Generic;
namespace FluentMappingsQuestion
{
public class Entity
{
public virtual int Id { get; set; }
public virtual IDictionary<string, Property> Properties { get; set; }
}
public class Property
{
public virtual Entity OwningEntity { get; set; }
public virtual string Name { get; set; }
public virtual int Value { get; set; }
public virtual decimal OtherValue { get; set; }
}
}
如何使用NHibernate(最好是流利的味道)映射它们,以便这样做:
[Test]
public void EntityPropertyMappingTest()
{
using (var session = _factory.OpenSession())
{
var entity = new Entity();
// (#1) I would *really* like to use this
entity.Properties["foo"] = new Property { Value = 42, OtherValue = 42.0M };
session.Save(entity);
session.Flush();
// (#2) I would like the entity below to "update itself"
// on .Save or .Flush. I got it to work with .Load()
Assert.AreEqual(42, entity.Properties["foo"].Value);
Assert.AreEqual(42.0M, entity.Properties["foo"].OtherValue);
Assert.AreEqual("foo", entity.Properties["foo"].Name);
Assert.AreEqual(entity, entity.Properties["foo"].Owner);
}
}
我几乎设法用这些映射来做到这一点:
// class EntityMap : ClassMap<Entity>
public EntityMap()
{
Id(x => x.Id);
HasMany(x => x.Properties)
.Cascade.AllDeleteOrphan()
.KeyColumn("EntityId")
.AsMap(x => x.Name);
}
// class PropertyMap : ClassMap<Property>
public PropertyMap()
{
Id(x => x.Id);
References(x => x.OwningEntity).Column("EntityId");
Map(x => x.Name).Length(32);
Map(x => x.Value);
{
我遇到的问题:
Entity.Properties
.Inverse()
,则会开始打破.Inverse()
,那么NHibernate会:INSERT(Entity), INSERT(Property), UPDATE(Property)
而不只是INSERT(Entity), INSERT(Property)
Property.Name
.Not.Nullable()
,则会开始打破.Not.Nullable()
,我的数据库架构中有一个漏洞我应该如何更改映射?
答案 0 :(得分:4)
我通过指定此映射解决了这个问题:
HasMany<Property>(Reveal.Member<Entity>("InternalProperties"))
.AsMap(p => p.Name)
.Cascade.AllDeleteOrphan()
.Inverse();
并创建IDictionary<string, Property>
类型的两个属性:Properties
和InternalProperties
。第一个是第二个代理字典,用于设置OwningEntity
条目的Name
和Property
属性。