Hello! I'm trying to understand lazy loading logic in NHibernate and in
general....
I'm writing an application where i define category and each category can
have its subcategories.
My Category is class called ComponentClass and subcategory is
ComponentFeatureA class (all code bellow).
In function GetByName I get ComponentClass by name and it works. FeaturesA
are not selected, but... what to do if I want to use it? If I properly
understood it should be automatically loaded when i get a property, so...
*IList<ComponentFeatureA>
fal = compClass.FeaturesA as List<ComponentFeatureA>;* should cause select
to DB? It doesn't work.
What am I doing wrong or what is wrong with my hbms and code...
I really trying to search something in google, but i couldn't. Maybe I just
missunderstood everything. Please for help smart ones :).
*Function of interest:*
public ComponentClass GetByName(String name)
{
ComponentClass compClass = new ComponentClass();
using (ISession session = NHibernateHelper.OpenSession())
{
using (ITransaction transaction =
session.BeginTransaction())
{
try
{
compClass = session.CreateQuery ("from
ComponentClass cc where cc.Name = :name")
.SetParameter ("name", name)
.UniqueResult<ComponentClass> ();
//NHibernateUtil.Initialize(compClass.FeaturesA);
//NHibernateUtil.Initialize(compClass.FeaturesB);
compClass.FeaturesA = new List<ComponentFeatureA>();
//IList<ComponentFeatureA> fal =
compClass.FeaturesA as List<ComponentFeatureA>;
transaction.Commit();
}
catch
{
transaction.Rollback();
throw;
}
}
}
return compClass;
}
*ComponentClass class:*
public class ComponentClass
{
public virtual Int32 ID {get; set;}
public virtual String Name {get; set;}
public virtual ICollection<ComponentFeatureA> FeaturesA {get; set;}
public virtual ICollection<ComponentFeatureB> FeaturesB {get; set;}
public ComponentClass(Int32 id, String name)
{
this.ID = id;
this.Name = name;
}
public ComponentClass(String name)
{
this.Name = name;
}
public ComponentClass ()
{
}
}
*ComponentClass hbm:*
<hibernate-mapping xmlns="urn:nhibernate-mapping-2.2"
assembly="NHibernateUltimateOEE"
namespace="NHibernateUltimateOEE.Domain">
<!-- more mapping info here -->
<class name="ComponentClass">
<id name="ID">
<column name="ID" not-null="false"/>
<generator class="native" />
</id>
<property name="Name">
<column name="Name" length="255" not-null="true" unique="true"/>
</property>
<set name="FeaturesA" cascade="save-update" inverse="true"
fetch="join">
<key column="ClassID"/>
<one-to-many class="ComponentFeatureA"/>
</set>
<set name="FeaturesB" cascade="save-update" inverse="true">
<key column="ClassID"/>
<one-to-many class="ComponentFeatureB"/>
</set>
</class>
</hibernate-mapping>
*ComponentFeatureA class:*
public class ComponentFeatureA
{
public virtual Int32 ID {get; set;}
public virtual ComponentClass ClassID {get; set;}
public virtual String Name {get; set;}
public ComponentFeatureA (Int32 id, ComponentClass compClass,
String name)
{
this.ID = id;
this.ClassID = compClass;
this.Name = name;
}
public ComponentFeatureA (ComponentClass compClass, String name)
{
this.ClassID = compClass;
this.Name = name;
}
public ComponentFeatureA ()
{
}
}
*ComponentFeatureA hbm:*
<hibernate-mapping xmlns="urn:nhibernate-mapping-2.2"
assembly="NHibernateUltimateOEE"
namespace="NHibernateUltimateOEE.Domain">
<!-- more mapping info here -->
<class name="ComponentFeatureA">
<id name="ID">
<column name="ID" not-null="false"/>
<generator class="native" />
</id>
<many-to-one name="ClassID" column="ClassID"
unique-key="UNIQ_FEATA"/>
<property name="Name">
<column name="Name" length="255" not-null="true"
unique-key="UNIQ_FEATA"/>
</property>
</class>
</hibernate-mapping>
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