<hibernate-mapping xmlns="urn:nhibernate-mapping-2.2" assembly="Continental.SignalList.Domain" namespace="Continental.SignalListManager.Domain">
<class name="SignalList" table="SL_SIGNALLIST" lazy="false" optimistic-lock="version" >
<id name="SignalListId" column="ID_SIGNALLIST" type="Decimal">
<generator class="sequence">
<param name="sequence">SL_SIGNALLIST_SEQ</param>
</generator>
</id>
<version column="NH_VERSION" name="NhVersion" />
<property name="Description" type="String" column="DESCRIPTION" />
<component class="SignalCollection" name="Signals">
<many-to-one class="SignalList" name="SignalList" column="CollectionSignalList" foreign-key="fk_ColSignalList_SignalList"/>
<bag name="Signals" table="SL_SIGNAL" lazy="false" cascade="all-delete-orphan" inverse="true">
<key column="ID_SIGNALLIST" />
<one-to-many class="Signal" />
</bag>
</component>
</class>
</hibernate-mapping>
<hibernate-mapping xmlns="urn:nhibernate-mapping-2.2" assembly="Continental.SignalList.Domain" namespace="Continental.SignalListManager.Domain">
<class name="Signal" table="SL_SIGNAL" lazy="true">
<id name="SignalId" column="ID_SIGNAL" type="Decimal">
<generator class="sequence">
<param name="sequence">SL_SIGNAL_SEQ</param>
</generator>
</id>
<version column="NH_VERSION" name="NhVersion"/>
<many-to-one class="SignalList" column="ID_SIGNALLIST" name="SignalList" foreign-key="fk_Signal_SignalList"/>
<property name="PinNumber" type="String" column="PIN_NUMBER" />
<property name="ContiTevesName" type="String" column="CONTI_TEVES_NAME" />
</class>
</hibernate-mapping>
This is the mapping of my SignalList class. It holds another class called SignalCollection implementing the IList<Signal> Interface. It's named "Signals" in this mapping file. This class holds the mechanism to add the Signal to the internal List (also named "Signals") and to update the added signals SignalList.
If I call update on a detached object where I just changed the Description of a SignalList, it also updates all the Childs in the Signals Collection.
Does NHibernate always update ALL reattached objects? Or can't NHibernate determine if an Object is dirty, because it was detached from a session?
At the moment this is no big problem, because objects are very small. But I think this can get a real issue if NHibernate tries to update thousand of records just because you changed one String.
P.S.: I wouldn't mind either if anybody would have a better solution for the Collection Component :)
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