nhibernate:在 ManyToOne 属性中使用 CompositeId 的一部分 [英] nhibernate: using parts of the compositeId in a ManyToOne Property

问题描述

我有一个这样的表结构:

I have a tablestructure like this:

Table entity
(
    otherEntity_id  int  // primarykey
    id              int  // primarykey

    parent_id       int
)

和班级

public class Entity
{
    public OtherEntity Other { get; set; }
    // simple int to discriminate different Entity for the same OtherEntity
    public int Id { get; set; }

    public Entity Parent { get; set; }
}

是否可以将其映射到实体类?(如果是的话如何)

is it possible to map this to the class Entity? (if yes how)

下面在save时抛出，因为dbcommand里的列不够，一个用了两次:

the following throws on save, because there are not enough columns in the dbcommand, one is used twice:

        CompositeId()
            .KeyReference(e => e.Other, "otherEntity_id")
            .KeyProperty(e => e.Id, "id")

        References(e => e.Parent).Columns("otherEntity_id", "parent_id");

使用 xml 或 fluent 都没有关系.

It doesnt matter using xml or fluent.

没有参考映射没有错误，参考映射跟随错误(我多次遇到此错误，每次当我的值多于映射列时):

without the reference mapped no error, with reference mapped following error (i had this error several times, everytime when i have more values than mapped columns):

System.ArgumentOutOfRangeException: System.ArgumentOutOfRangeException : Der Index lag außerhalb des Bereichs. Er muss nicht negativ und kleiner als die Auflistung sein.
Parametername: index
   bei System.ThrowHelper.ThrowArgumentOutOfRangeException(ExceptionArgument argument, ExceptionResource resource)
   bei System.ThrowHelper.ThrowArgumentOutOfRangeException()
   bei System.Collections.Generic.List`1.get_Item(Int32 index)
   bei Npgsql.NpgsqlParameterCollection.get_Item(Int32 index)
   bei Npgsql.NpgsqlParameterCollection.GetParameter(Int32 index)
   bei System.Data.Common.DbParameterCollection.System.Collections.IList.get_Item(Int32 index)
   bei NHibernate.Type.Int16Type.Set(IDbCommand rs, Object value, Int32 index)
   bei NHibernate.Type.NullableType.NullSafeSet(IDbCommand cmd, Object value, Int32 index)
   bei NHibernate.Type.NullableType.NullSafeSet(IDbCommand st, Object value, Int32 index, ISessionImplementor session)
   bei NHibernate.Type.ComponentType.NullSafeSet(IDbCommand st, Object value, Int32 begin, ISessionImplementor session)
   bei NHibernate.Persister.Entity.AbstractEntityPersister.Dehydrate(Object id, Object[] fields, Object rowId, Boolean[] includeProperty, Boolean[][] includeColumns, Int32 table, IDbCommand statement, ISessionImplementor session, Int32 index)
   bei NHibernate.Persister.Entity.AbstractEntityPersister.Insert(Object id, Object[] fields, Boolean[] notNull, Int32 j, SqlCommandInfo sql, Object obj, ISessionImplementor session)
   bei NHibernate.Persister.Entity.AbstractEntityPersister.Insert(Object id, Object[] fields, Object obj, ISessionImplementor session)
   bei NHibernate.Action.EntityInsertAction.Execute()
   bei NHibernate.Engine.ActionQueue.Execute(IExecutable executable)
   bei NHibernate.Engine.ActionQueue.ExecuteActions(IList list)
   bei NHibernate.Engine.ActionQueue.ExecuteActions()
   bei NHibernate.Event.Default.AbstractFlushingEventListener.PerformExecutions(IEventSource session)
   bei NHibernate.Event.Default.DefaultFlushEventListener.OnFlush(FlushEvent event)
   bei NHibernate.Impl.SessionImpl.Flush()

测试代码

        var e1 = new Entity { Id = 2, Other = other };
        var e2 = new Entity { Id = 3, Other = other, Parent = e1 };

        Session.Save(e1);
        Session.Save(e2);
        Session.Flush();    // throws here
        Session.Clear();

        var key = new Entity { Id = e2.Id, Other = e2.Other };

        var loaded = Session.Get<Entity>(key);

如果不可能，请有人告诉我吗?

if it's not possible could please someone tell me?

推荐答案

我还没找到解决方案，将我的模型映射到:

I still haven't found a solution and mapped changed my model to:

public class Entity
{
    public OtherEntity Other { get; set; }
    // simple int to discriminate different Entity for the same OtherEntity
    public int Id { get; set; }

    public int ParentId { get; set; }
}

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