[nhusers] Lazy load of one-to-one association

[Jeffrey Zhao]

I've an one-to-one assocation and tried to get lazy load. I get a lot of 
information of (N)Hibernate from search engine, but it confused me even more. 
Some people say that I cannot get this but some others say yes. I tried with 
these information but failed. Here's what I use as the model:

public class User
{
    public virtual int UserID { get; set; }
    public virtual string Name { get; set; }
    public virtual UserDetail Detail { get; set; }
}

public class UserDetail
{
    public virtual int UserID { get; set; }
    public virtual int Age { get; set; }
    public virtual User User { get; set; }
}


The mapping:

<hibernate-mapping xmlns="urn:nhibernate-mapping-2.2" assembly="NHTest" 
namespace="NHTest">
  <class name="User" table="`User`">
    <id name="UserID" type="Int32" column="UserID">
      <generator class="identity" />
    </id>
    <one-to-one name="Detail" class="UserDetail" lazy="proxy" />
    <property name="Name" type="String">
      <column name="Name" />
    </property>
  </class>

  <class name="UserDetail" table="`UserDetail`" lazy="true">
    <id name="UserID" type="Int32" column="UserID">
      <generator class="foreign">
        <param name="property">User</param>
      </generator>
    </id>
    <one-to-one constrained="true" name="User" class="User" />
    <property name="Age" type="Int32">
      <column name="Age" />
    </property>
  </class>
</hibernate-mapping>


When I tried to get an User instance by "session.Get<User>(10)", NH execute the 
SQL:

SELECT
    user0_.UserID as UserID0_1_,
    user0_.Name as Name0_1_,
    userdetail1_.UserID as UserID1_0_,
    userdetail1_.Age as Age1_0_
FROM
    [User] user0_
left outer join
    [UserDetail] userdetail1_
        on user0_.UserID=userdetail1_.UserID
WHERE
    user0_.user...@p0;
@p0 = 4


What I need is just get the User instance but set a proxy of UserDetail for 
lazy loading. I use Castle as byte code provider. Any thing wrong?


Blog: http://www.cnblogs.com/JeffreyZhao/
Twitter: http://twitter.com/jeffz_cn
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