1
我有一些問題級聯所有(孤兒),並從數據庫中刪除舊的objcet。流利的NHibernate參考/多對一映射級聯全部不工作
例如: 我有一個類A包含一個類B的對象。現在,當我創建一個類A的對象並保存它,一切工作正常。當我調用方法SetValueOfB(int i)
並再次保存對象A時,舊對象B仍在數據庫中。
這些類之間的關聯是否必須是定向的(對於每個HasMany/Reference/HasOne ...)? (但對象b沒有任何關於對象a的知識)
有沒有辦法解決單向關聯的問題?
我需要一對一映射嗎?因爲對象B只能屬於對象A(A是一個參數,B是一個值)。
這是一個失敗的測試:
using System.Collections.Generic;
using System.Data;
using System.IO;
using FluentNHibernate.Cfg;
using FluentNHibernate.Cfg.Db;
using FluentNHibernate.Mapping;
using NHibernate;
using NHibernate.Cfg;
using NHibernate.Tool.hbm2ddl;
using NUnit.Framework;
namespace ReferenceCascade.Test
{
public class CascadeTest
{
private const string DbFile = "firstProject.db";
[Test]
public void checkCascadeAll()
{
var sessionFactory = CreateSessionFactory();
A testee = new A(new B(1));
using (var session = sessionFactory.OpenSession())
{
using (var transaction = session.BeginTransaction())
{
session.SaveOrUpdate(testee);
transaction.Commit();
}
}
testee.SetValueOfB(2);
using (var session = sessionFactory.OpenSession())
{
using (var transaction = session.BeginTransaction())
{
session.SaveOrUpdate(testee);
transaction.Commit();
}
}
using (var session = sessionFactory.OpenSession())
{
using (session.BeginTransaction())
{
IList<B> stores = session.CreateCriteria(typeof(B))
.List<B>();
Assert.That(stores.Count, Is.EqualTo(1));
}
}
}
private static ISessionFactory CreateSessionFactory()
{
return Fluently.Configure()
.Database(SQLiteConfiguration.Standard.UsingFile(DbFile).IsolationLevel(IsolationLevel.ReadCommitted))
.Mappings(m =>
m.FluentMappings.AddFromAssemblyOf<CascadeTest>())
.ExposeConfiguration(BuildSchema)
.BuildSessionFactory();
}
private static void BuildSchema(Configuration config)
{
// delete the existing db on each run
if (File.Exists(DbFile))
{
File.Delete(DbFile);
}
// this NHibernate tool takes a configuration (with mapping info in)
// and exports a database schema from it
new SchemaExport(config)
.Create(false, true);
}
}
public abstract class Entity
{
public const long InitialId = 0;
private readonly long _id;
protected Entity()
{
_id = InitialId;
}
public virtual long Id
{
get { return _id; }
}
}
public class A : Entity
{
private B _b;
public A()
{
}
public A(B b)
{
_b = b;
}
public virtual void SetValueOfB(int i)
{
_b = new B(i);
}
public virtual B B
{
get { return _b; }
}
}
public class B : Entity
{
private readonly int _i;
public B()
{
}
public B(int i)
{
_i = i;
}
public virtual int I
{
get { return _i; }
}
}
public class EntityMap<T> : ClassMap<T> where T : Entity
{
public EntityMap()
{
Id(x => x.Id).GeneratedBy.HiLo("33878").Access.CamelCaseField(Prefix.Underscore);
}
}
public class AMap : EntityMap<A>
{
public AMap()
{
Table("A");
References(x => x.B).Not.LazyLoad().Cascade.All().Access.CamelCaseField(Prefix.Underscore);
}
}
public class BMap : EntityMap<B>
{
public BMap()
{
Table("B");
Map(x => x.I).Not.LazyLoad().Access.CamelCaseField(Prefix.Underscore);
}
}
}
還是這裏的項目:vs project
如果B被綁定到A爲什麼你有它在單獨的表?遺產? 'cascade.DeleteOrphan'是你在這裏需要的,但是這隻適用於兒童的集合,因爲它對於引用沒有意義。 – Firo