使用无状态会话字典值懒查找 [英] Lazy lookup of a dictionary value using a stateless session
问题描述
在我的应用程序，我成立了一个三元字典映射，使给定用户，我可以为所属的用户对象的每个实例检索设置。也就是说，我有这样的：
In my app, I set up a ternary dictionary mapping so that for a given user, I can retrieve "settings" for each instance of an object that belongs to the user. That is, I have something like:
public class User
{
public virtual IDictionary<Baz, BazSettings> BazSettings { get; set; }
//...
所以，每当我有一个巴兹对象，我可以通过 currentUser.BazSettings [巴兹] 。
我想能够使用无状态会话要做到这一点，但我得到一个 LazyInitializationException中使用此代码：
I would like to be able to use a stateless session to do this, but I get a LazyInitializationException with this code:
//int bazId;
using (IStatelessSession session = Global.SessionFactory.OpenStatelessSession())
{
var currentUser = session.Get<User>(Membership.GetUser().ProviderUserKey);
var baz = session.Get<Baz>(bazId);
var bazSettings = currentUser.BazSettings[baz]; // raises `LazyInitializationException`
当我使用代替的Isession ，然后问题消失。
When I use instead an ISession, then the problem goes away.
完整NHibernate的错误消息包括文本没有会话或会话已关闭。这是有道理的，因为使用的是无状态的会话时，实体没有连接到会议。不过，我认为有使用无状态会话执行此查询的方式。
The full NHibernate error message includes the text "no session or session was closed". This makes sense because when using a stateless session, entities are not connected to the session. However, I would think that there is a way to use the stateless session to perform this lookup.
我如何使用无状态会话执行查找 currentUser.BazSettings [巴兹] ？
How do I use a stateless session to perform the lookup currentUser.BazSettings[baz]?
推荐答案
无状态会话不支持延迟加载，正是因为他们的无国籍：他们没有跟踪的任何关于与他们检索到的实体
Stateless sessions do not support lazy loading, exactly because they are stateless: they do not track anything about the entities retrieved with them.
的唯一途径使其工作是预先加载的集合。但是，为什么你的希望的使用无状态的会话，如果他们明确你需要什么不提供？
The only way to make it work is eager loading the collection. But why do you want to use stateless sessions, if they clearly do not provide what you need?
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