I'm using NHibernate 3.2 with appfabric 1.1 for the 2nd level cache. I’ve 2
classes mapped on the same table. The first class
*AFullEntity*(MonitorLayoutData in the sample), inherit a second class which is
lightweight class (MonitorLayout). MonitorLayoutData contains a heavy
property that is not present in the base class. For example :
<?xml version="1.0" encoding="utf-8"?><hibernate-mapping
xmlns="urn:nhibernate-mapping-2.2">
<class name="Entities.MonitorLayout,Entities" table="MonitorLayouts2"
lazy="false" schema="dbo" polymorphism="explicit">
<cache usage="nonstrict-read-write"/>
<id name="Id" column="MonitorLayout_ID" type="int">
<generator class="native" />
</id>
<property name="Name" column="MonitorLayout" type="string" />
<property name="UserId" column="User_ID" type="int" />
<property name="IsPublic" column="IsPublic" type="Boolean" not-null="true"
/>
<property name="ViewGuid" column="ViewGuid" type="string" not-null="true" />
<property name="TreeNode" column="TreeNode" type="string" />
<property name="IncludeNodeChildren" column="IncludeNodeChildren"
type="Boolean" />
</class>
<class name="Entities.MonitorLayoutData,Entities" table="MonitorLayouts2"
lazy="false" schema="dbo" polymorphism="explicit">
<cache usage="nonstrict-read-write"/>
<id name="Id" column="MonitorLayout_ID" type="int">
<generator class="native" />
</id>
<property name="Name" column="MonitorLayout" type="string" />
<property name="UserId" column="User_ID" type="int" />
<property name="IsPublic" column="IsPublic" type="Boolean" not-null="true"
/>
<property name="ViewGuid" column="ViewGuid" type="string" not-null="true" />
<property name="TreeNode" column="TreeNode" type="string" />
<property name="IncludeNodeChildren" column="IncludeNodeChildren"
type="Boolean" />
<property name="LayoutData" column="LayoutData" type="BinaryBlob"
not-null="false"/>
</class></hibernate-mapping>
Those classes use an explicit polymorphism to retrieve only entities for
the selected type like note in the documentation : “Explicit polymorphism
is useful when two different classes are mapped to the same table (this
allows a "lightweight" class that contains a subset of the table columns)”.
However I got a problem when entities are cached. When I update a
AFullEntity changes are not report in the lightweight class and this is a
big problem for us. I try other mechanism like subclass or extends but
NHibernate force me to declare a discriminator element, which is not
required for me.
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