Hello OJB users!
(repository and objects listed at the end, problem description follows here)
I read some emails in the mailing archives but many of them focus on the
delete Problem in non-decomposed m:n Mappings. I use manual
decomposition because I add extra information to my intermediary table
so I need a association class.
I used the example for manual decomposition in the "basic techniques"
documentation on the ojb homepage by Thomas Mahler, Jakob Braeuchli and
Armin Waibel.
I have no problem to add (store) my association class in the
intermediary table, but when I try to remove (delete) an entry, it does
not work. I use broker.delete(object), not broker.deleteByQuery(object):
public void remove(ExhibitorAndBooth object) {
PersistenceBroker broker =
PersistenceBrokerFactory.defaultPersistenceBroker();
broker.beginTransaction();
broker.delete(object);
broker.commitTransaction();
broker.close();
}
I get no exceptions, everything seems to be fine, but the entry is not
deleted.
Is there any solution/trick? Does an update on 1.0.3 fix this? I use
cocoon 2.1.7, it has ojb1.0.1 included, I would have to recompile my
cocoon with the new ojb version.
Well, thanks for any suggestions or ideas. My repository and objects are
listed below.
Here are the entries of my repository for the objects Exhibitor and
Booth with their m:n relation and the association class ExhibitorAndBooth:
##############
repository.xml
<class-descriptor
class="com.mediaconcept.fairmanager.exhibitor.beans.Exhibitor"
table="EXHIBITORS">
<field-descriptor name="id" column="EX_ID" jdbc-type="INTEGER"
primarykey="true" autoincrement="true" nullable="false"
default-fetch="true" sequence-name="exhibitors_ex_id_seq" />
...
<collection-descriptor name="exhibitorsAndBooths"
element-class-ref="com.myPackage.ExhibitorAndBooth">
<inverse-foreignkey field-ref="exhibitor_id"/>
</collection-descriptor>
</class-descriptor>
<class-descriptor class="com.mypackage.Booth" table="BOOTHS">
<field-descriptor name="id" column="BO_ID" jdbc-type="INTEGER"
primarykey="true" autoincrement="true" nullable="false"
default-fetch="true" sequence-name="booths_bo_id_seq" />
...
<collection-descriptor name="exhibitorsAndBooths"
element-class-ref="com.mypackage.ExhibitorAndBooth">
<inverse-foreignkey field-ref="booth_id"/>
</collection-descriptor>
</class-descriptor>
<class-descriptor class="com.mypackage.ExhibitorAndBooth"
table="EXHIBITORSANDBOOTHS">
<field-descriptor name="exhibitor_id" column="EX_ID"
jdbc-type="INTEGER" primarykey="true" />
<field-descriptor name="booth_id" column="BO_ID"
jdbc-type="INTEGER" primarykey="true" />
<field-descriptor name="hierarchy" column="EB_HIERARCHY"
jdbc-type="INTEGER" />
<reference-descriptor name="exhibitor"
class-ref="com.myPackage.Exhibitor">
<foreignkey field-ref="exhibitor_id" />
</reference-descriptor>
<reference-descriptor name="booth" class-ref="com.myPackage.Booth">
<foreignkey field-ref="booth_id" />
</reference-descriptor>
</class-descriptor>
###################
The classes:
public class Exhibitor {
private int id;
...
private Collection exhibitorsAndBooths = new ArrayList();
...
//getters/setters
}
public class Booth {
private int id;
...
private Collection exhibitorsAndBooths = new ArrayList();
...
//getters/setters
}
public class ExhibitorAndBooth {
private int exhibitor_id;
private int booth_id;
private int hierarchy;
private Exhibitor exhibitor;
private Booth booth;
...
//getters/setters
}
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