You have to configure a proxyprovider, otherwise NHibernate would
throw an exception while building the configuration.
In the prfiler ther is no join. For the Child there is an extra sql
query. This is the behaviour of lazy="false". Setting lazy="proxy" has
no effect.
But I' ve forgot a detail in the Mapping above. The id of the child is
mapped to. But I can't imagine tha this disables lazy loading.
Here the corrected mapping:
<class name="Parent" table="Parent" dynamic-update="true" lazy="true"
<id name="Id" unsaved-value="0">
<generator class="native" />
</id>
<property name="Name" not-null="true" />
<property childId access="field" not-null="true" />
<many-to-one name="Child" column="ChildId" insert="false"
update="false" not-found="ignore" />
</class>
I have to do this because of our legacy schema.
In my private project lazyloading works perfectly.
On Apr 19, 6:59 pm, nadav s <[email protected]> wrote:
> sorry proxy...
> did you configure a proxy provider (like linfu or castle)?
> did you see that the sql for the fetch joins the two tables?
> putting lazy="proxy" works it something in you're mapping\configuration
>
> On Mon, Apr 19, 2010 at 4:37 PM, Armin Landscheidt <
>
>
>
> [email protected]> wrote:
> > First I cant see it in the profiler. Second I have a Test which varifies
> > that all objects are loaded per join. And when I first started the
> > testrunner for the many-to-one assiciation the test doesn't failed. The test
> > looks like:
>
> > Child child = new Child();
> > Parent parent = new Parent();
> > praent.Child = child;
>
> > using(ISession session = sessionFactory.OpenSession){
> > session.Save(child);
> > session.Save(parent);
> > }
>
> > Parent result:
> > using(ISession session = sessionFactory.OpenSession){
> > result = session.CreateCriteria<Parent>()
>
> > .Add(Restrictions.Eq("Name", "myName"))
> > .UniqueResult<Parent>();
> > }
>
> > Assert.That(parent.Child, Is.EqualTo(child))
>
> > With the query above the test should fail because the session was closed.
>
> > 2010/4/19 Diego Mijelshon <[email protected]>
>
> > How are you determining that lazy loading isn't happening?
>
> >> Diego
>
> >> On Mon, Apr 19, 2010 at 09:44, Armin Landscheidt
> >> <[email protected]>wrote:
>
> >>> Hallo
>
> >>> I'm loading an Object with a many-to-one association. When I load the
> >>> parent-object I would expect that the child is loaded lazy. But the
> >>> child ist loaded directly. How can this be? Is there a default which
> >>> could be set or something else?
>
> >>> The mapping is like this:
>
> >>> <class name="Parent" table="Parent" dynamic-update="true" lazy="true"
>
> >>> <id name="Id" unsaved-value="0">
> >>> <generator class="native" />
> >>> </id>
> >>> <property name="Name" not-null="true" />
> >>> <many-to-one name="Child" column="ChildId" insert="false"
> >>> update="false" not-found="ignore" />
> >>> </class>
>
> >>> <class name="Child" table="Child" dynamic-update="true" lazy="true" >
> >>> <id name="Id" unsaved-value="0">
> >>> <generator class="native" />
> >>> </id>
> >>> <property name="Name" not-null="true" />
> >>> </class>
>
> >>> The Query:
> >>> var parent = session.CreateCriteria<Parent>()
> >>> .Add(Restrictions.Eq("Name", "myName"))
> >>> .UniqueResult<Parent>();
>
> >>> The properties are all virtual. If not NHibernate would throw an
> >>> exception.
> >>> Does anyone know a reason why the child is not lazy loaded?
>
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