Fluent-Nhibernate参考和PropertyRef使用Lazy Load进行选择

问题描述

我为引用属性之一使用 PropertyRef 。使用 LazyLoad（），它仍然会执行Select并加载 User 实体，即使我从不击中SalesPerson属性。

订单映射

  Id（x => x.Id）.GeneratedBy.Native（）; 
引用（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;组; } 
 public virtual string Title {get;组; } 
 ... 
} 
  

用户映射

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

用户等级

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

生成的顺序映射

pre $ <多对一的类=Project.Userlazy =proxyname =SalesPerson属性-REF = 用户名 >
< column name =rsm/>
< /多对一>


执行代码

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

有没有办法阻止选择加载用户实体，当我不使用



而不是你问，但也认为与代理多对一不允许你进行类型检查，如果你的子类用户，请参阅


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.

Order Mapping

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

Order Class

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

User Mapping

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

User Class

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

Generated Order Mapping

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

Executing Code

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

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

解决方案

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

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, seehttp://ayende.com/Blog/archive/2010/01/28/nhibernate-new-feature-no-proxy-associations.aspx

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