Fluent-Nhibernate References 和 PropertyRef 使用延迟加载进行选择 [英] Fluent-Nhibernate References and PropertyRef Doing a Select With Lazy Load

问题描述

我使用 PropertyRef 作为我的 References 属性之一.使用 LazyLoad() 它仍然执行 Select 并加载 User 实体，即使我从未命中" SalesPerson 属性.

I am using PropertyRef for one of my References properties. With LazyLoad() it still does a Select and loads the User entity, even though I never "hit" the SalesPerson property.

订单映射

Id(x => x.Id).GeneratedBy.Native();
References(x => x.SalesPerson)
                        .LazyLoad()
                        .PropertyRef(x => x.Username)
                        .Column("rsm");
Map(x => x.Title);

订单类

public class Order : BaseEntity
{
    ...
    public virtual User SalesPerson { get; set; }
    public virtual string Title { get; set; }
    ...
}

用户映射

Id(x => x.Id).GeneratedBy.Native();
Map(x => x.Username).Column("login");

用户类

public class User : BaseEntity
{
     public virtual string Username { get; set; }
     ...
}

生成的订单映射

<many-to-one class="Project.User" lazy="proxy" name="SalesPerson" property-ref="Username">
      <column name="rsm" />
</many-to-one>

执行代码

var order = session.Get<Order>(1);
Console.WriteLine(order.Title);

当我不使用 User 实体时，是否有任何方法可以阻止 Select 加载 User 实体?

Is there anyway to prevent the Select to load the User entity when I'm not using the User entity?

推荐答案

与 property-ref 有关，请参阅NHibernate 通过会话创建代理.Load()，但不是通过 Linq 或 Criteria API

Has to do with property-ref see NHibernate creates proxy via session.Load(), but not via Linq or Criteria API

并不是你问的，还要考虑到多对一的代理不允许你进行类型检查，如果你子类化用户，见http://ayende.com/Blog/archive/2010/01/28/nhibernate-new-feature-no-proxy-associations.aspx

And not that you asked, but also consider that many-to-one with proxy does not allow you to do type-checking if you subclass User, see http://ayende.com/Blog/archive/2010/01/28/nhibernate-new-feature-no-proxy-associations.aspx

这篇关于Fluent-Nhibernate References 和 PropertyRef 使用延迟加载进行选择的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！