nhibernate级联 - 分离实体的问题

时间:2009-09-09 07:58:59

标签: nhibernate cascade

我在这里试图解决级联更新/删除问题: - )

我有一个包含子实体集合的父实体。如果我修改分离的父对象中的子实体列表,添加,删除等 - 我没有看到更新正确级联到子集合。

映射文件:

  <hibernate-mapping xmlns="urn:nhibernate-mapping-2.2"
                   assembly="Domain"
                   namespace="Domain">

  <class name="Parent" table="Parent" >

    <id name="Id">
      <generator class="guid.comb" />
    </id>

    <version name="LastModified"
                    unsaved-value="0"
                    column="LastModified"
                     />

    <property name="Name" type="String" length="250" />

    <bag name="ParentChildren" lazy="false" table="Parent_Children" cascade="all-delete-orphan" inverse="true">
      <key column="ParentId" on-delete="cascade" />
      <one-to-many class="ParentChildren" />
    </bag>

  </class>

  <class name="ParentChildren" table="Parent_Children">

    <id name="Id">
      <generator class="guid.comb" />
    </id>

    <version name="LastModified"
                    unsaved-value="0"
                    column="LastModified"
                     />

    <many-to-one
   name="Parent"
   class="Parent"
   column="ParentId"
   lazy="false"
   not-null="true"
       />
  </class>
</hibernate-mapping>

测试

    [Test]
    public void Test()
    {
        Guid id;
        int lastModified;
        // add a child into 1st session then detach
        using(ISession session = Store.Local.Get<ISessionFactory>("SessionFactory").OpenSession())
        {
            Console.Out.WriteLine("Selecting...");
            Parent parent =  (Parent) session.Get(typeof (Parent), new Guid("4bef7acb-bdae-4dd0-ba1e-9c7500f29d47"));

            id = parent.Id;
            lastModified = parent.LastModified + 1; // ensure the detached version used later is equal to the persisted version

            Console.Out.WriteLine("Adding Child...");
            Child child = (from c in session.Linq<Child>() select c).First();
            parent.AddChild(child, 0m);

            session.Flush();
            session.Dispose(); // not needed i know
        }

        // attach a parent, then save with no Children
        using (ISession session = Store.Local.Get<ISessionFactory>("SessionFactory").OpenSession())
        {
            Parent parent = new Parent("Test");              

            parent.Id = id; 
            parent.LastModified = lastModified; 

            session.Update(parent);
            session.Flush();
        }
    }

我认为产品已更新为其集合中没有子项的事实 - 子项将在Parent_Child表中删除。这些问题似乎与将产品附加到新会话有关?由于级联设置为all-delete-orphan,我假设对集合的更改将传播到相关的实体/表?在这种情况下删除?

我在这里缺少什么?

C

1 个答案:

答案 0 :(得分:2)

我一直在努力解决类似的问题。不确定我的解决方案是否适合您的问题,但尝试使用Session.Merge而不是ISession.Update。