级联错误：具有相同标识符值的不同对象已与会话关联

发布于 2024-12-12 17:29:19 字数 900 浏览 3 评论 0原文

我有一个由 NHibernate 实现并使用延迟加载的项目。我在这个项目中有两个课程：个人和家庭。这两者之间的关系是聚合，意味着一个人有一个家庭列表。映射是：

  <class name="Person" table="Person_Person" >

    <id name="Id" type="Int64" unsaved-value="0">
      <generator class="native" />
    </id>

    <bag name="Families" inverse="true" table="Person_Family" cascade="all-delete-orphan" >
      <key column="Person_id_fk"/>
      <one-to-many class="Domain.Entities.Family,Domain.Entities"/>
    </bag>

  </class>

在这个项目中，我通过 ID 获取一个人，然后更新一个家庭成员。

Person person = SessionInstance.Get<Person>(id);
foreach (Family fam in person.Families)
    if (fam.Name == "Jaun")
        {
        fam.Code = 100;
        SessionInstance.Update(fam);
        }

该系列未更新，因为此消息引发异常： `具有相同标识符值的不同对象已与会话关联：193，实体：Domain.Entities.Family

我如何更新一个人的家庭？

原文

I have a project by NHibernate implementation and using Lazy Loading.
I have two class in this project : Person and Family.
Relation between Those two is aggregation, is mean a Person has a list of Family.
Mapping is :

  <class name="Person" table="Person_Person" >

    <id name="Id" type="Int64" unsaved-value="0">
      <generator class="native" />
    </id>

    <bag name="Families" inverse="true" table="Person_Family" cascade="all-delete-orphan" >
      <key column="Person_id_fk"/>
      <one-to-many class="Domain.Entities.Family,Domain.Entities"/>
    </bag>

  </class>

In this project, I Get a person by ID then update a family of families person.

Person person = SessionInstance.Get<Person>(id);
foreach (Family fam in person.Families)
    if (fam.Name == "Jaun")
        {
        fam.Code = 100;
        SessionInstance.Update(fam);
        }

The family not updated, Because throw a exception by this message :
`a different object with the same identifier value was already associated with the session: 193, of entity: Domain.Entities.Family

How can i update a family of person?

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尝蛊 2024-12-19 17:29:19

在您的情况下，您不需要调用 Update。您只需要刷新会话即可。在你的情况下，我会做这样的事情：

using (ITransaction transaction = SessionInstance.BeginTransaction())
{
    foreach (Family fam in person.Families)
    {
        if (fam.Name == "Jaun")
        {
            fam.Code = 100;
        }
    }

    transaction.Commit();
}

或者你可以做这样的事情：

foreach (Family fam in person.Families)
{
    if (fam.Name == "Jaun")
    {
        fam.Code = 100;
    }
}

SessionInstance.Flush();

ISession.Update() 用于更新分离对象。在你的情况下，该对象没有分离。您应该阅读 NHibernate 文档中的以下 2 部分，以便更好地理解这一点：

http://www.nhforge.org/doc/nh/en/index.html#manipulateddata-updating-insession
http://www.nhforge.org/doc/nh /en/index.html#manipulateddata-updating-detached

In your case here you do not need to call Update. You just need to flush the session. In your case I would do something like this:

using (ITransaction transaction = SessionInstance.BeginTransaction())
{
    foreach (Family fam in person.Families)
    {
        if (fam.Name == "Jaun")
        {
            fam.Code = 100;
        }
    }

    transaction.Commit();
}

Or you can do something like this:

foreach (Family fam in person.Families)
{
    if (fam.Name == "Jaun")
    {
        fam.Code = 100;
    }
}

SessionInstance.Flush();

ISession.Update() is meant for updating detached objects. In your case the object is not detached. You should read the following 2 sections in the NHibernate documenation to have a better understanding of this:

http://www.nhforge.org/doc/nh/en/index.html#manipulatingdata-updating-insession
http://www.nhforge.org/doc/nh/en/index.html#manipulatingdata-updating-detached

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奈何桥上唱咆哮 2024-12-19 17:29:19

尝试更新人员对象而不是家庭对象。

Person person = SessionInstance.Get<Person>(id);
foreach (Family fam in person.Families)
    if (fam.Name == "Jaun")
        {
        fam.Code = 100;
        }
SessionInstance.Update(person);

try to update person object instead of family object.

Person person = SessionInstance.Get<Person>(id);
foreach (Family fam in person.Families)
    if (fam.Name == "Jaun")
        {
        fam.Code = 100;
        }
SessionInstance.Update(person);

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