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Forum locked This topic is locked, you cannot edit posts or make further replies.  [ 1 post ] 
Author Message
 Post subject: many-to-one lazy loading not working if property-ref is set
PostPosted: Mon Oct 20, 2008 9:51 am 
Code:

<class name="Ruolo" table="DBO_T_RUOLO">

<id name="id" column="id" type="integer">

<generator class="native"/>

</id>

<property name="codiceProdotto" column="CPRODOTTO" type="string"/>

<property name="codiceContratto" column="CCTR" type="string"/>

<property name="codiceCliente" column="CCLI" type="string"/>

<many-to-one name="tipoRuolo" column="CTIPORUOLO" class="TipoRuolo" property-ref="codiceTipoRuolo"/>

</class>




Code:

<class name="TipoRuolo" table="DBO_T_TIPORUOLO" proxy="TipoRuolo">

<id name="id" column="id" type="integer">

<generator class="native"/>

</id>

<property name="codiceTipoRuolo" column="CTIPORUOLO" type="string"/>

<property name="descrizioneTipoRuolo" column="DTIPORUOLO" type="string"/>

</class>




As you can see lazy loading should be enabled, having set the "proxy" attribute. However if I run the simple query:


Session session = HibernateUtil.currentSession();

Transaction tx= session.beginTransaction();

List ruoli = session.find("from Ruolo r where r.codiceCliente='325831'");

for (Iterator it = ruoli.iterator(); it.hasNext();) {

Ruolo r = (Ruolo) it.next();

out.println("\tcodice cliente: " + r.getCodiceCliente());

}

tx.commit();


the query does not reference the tipoRuolo property, nevertheless hibernates generates SQL queries also for TipoRuolo (non-lazy behaviour). This is the log file:


Hibernate: select ruolo0_.id as id, ruolo0_.CPRODOTTO as CPRODOTTO, ruolo0_.CCTR as CCTR, ruolo0_.CCLI as CCLI, ruolo0_.CTIPORUOLO as CTIPORUOLO from DBO_T_RUOLO ruolo0_ where (ruolo0_.CCLI='325831' )

Hibernate: select tiporuolo0_.id as id0_, tiporuolo0_.CTIPORUOLO as CTIPORUOLO0_, tiporuolo0_.DTIPORUOLO as DTIPORUOLO0_ from DBO_T_TIPORUOLO tiporuolo0_ where tiporuolo0_.CTIPORUOLO=?

Hibernate: select tiporuolo0_.id as id0_, tiporuolo0_.CTIPORUOLO as CTIPORUOLO0_, tiporuolo0_.DTIPORUOLO as DTIPORUOLO0_ from DBO_T_TIPORUOLO tiporuolo0_ where tiporuolo0_.CTIPORUOLO=?

Hibernate: select tiporuolo0_.id as id0_, tiporuolo0_.CTIPORUOLO as CTIPORUOLO0_, tiporuolo0_.DTIPORUOLO as DTIPORUOLO0_ from ........


I suppose that the non-lazy behaviour is somehow related to the "property-ref" attribute. Infact I modified the mapping file as follows:

Code:

<class name="Ruolo" table="DBO_T_RUOLO">

<id name="id" column="id" type="integer">

<generator class="native"/>

</id>

<property name="codiceProdotto" column="CPRODOTTO" type="string"/>

<property name="codiceContratto" column="CCTR" type="string"/>

<property name="codiceCliente" column="CCLI" type="string"/>

<many-to-one name="tipoRuolo" column="CTIPORUOLO" class="TipoRuolo"/>

</class>



Code:

<class name="TipoRuolo" table="DBO_T_TIPORUOLO" proxy="TipoRuolo">

<id name="codiceTipoRuolo" column="CTIPORUOLO" type="string">

<generator class="native"/>

</id>

<property name="descrizioneTipoRuolo" column="DTIPORUOLO" type="string"/>

</class>



hence I eliminated the property-ref attribute and set codiceTipoRuolo as primary key on the TipoRuolo class. Without changing anything in the java code and running the same query I got a lazy load of the Ruolo class (i.e. no SQL queries on the DBO_T_TIPORUOLO table).


So it seems to me that setting the "property-ref" attribute prevents from lazy loading of a class. How can I solve this problem? I need to map my entities using property-ref attribute.

Thanks.


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