Hello,
My name is Alexandre and I'm a student in the University of Geneva in the
Information Systems departement.
I'm currently working on a web application using an OJB layer. I have a
problem of column ambiguously defined when querying my Oracle Database through
OJB's QueryFactory method. I read Jakob Braeuchi's answer to Naveen regarding
column prefixes.
Unfortunately, I didn't quite understand his solution: how can I base columns
on
attributes?
here is the method querying the database:
PersistenceBroker broker =
PersistenceBrokerFactory.defaultPersistenceBroker();
Collection rootelements = null;
Criteria crit = new Criteria();
crit.addEqualTo("INROOT","1");
Query q = QueryFactory.newQuery(Folder.class, crit);
try{
rootelements = broker.getCollectionByQuery(q);
}
catch(PersistenceBrokerException e)
{
e.printStackTrace();
if(broker != null) broker.abortTransaction();
}
finally
{
if (broker != null) broker.close();
}
And here is the part of the relevant repository:
<class-descriptor
schema="FM"
class="matis.component.filemanager.Folder"
table="FOLDER">
<field-descriptor
name="id_Elem"
column="ID_FOLDER"
jdbc-type="INTEGER"
primarykey="true"/>
<collection-descriptor
name="fichiersContained"
collection-class="org.apache.ojb.broker.util.collections.ManageableArrayList"
element-class-ref="matis.component.filemanager.Fichier"
auto-retrieve="true"
auto-update="true"
auto-delete="true"
indirection-table="INFOLD">
<fk-pointing-to-this-class column="FOL_ID_ELEMENT"/>
<fk-pointing-to-element-class column="ID_ELEMENT"/>
</collection-descriptor>
<collection-descriptor
name="foldersContained"
collection-class="org.apache.ojb.broker.util.collections.ManageableArrayList"
element-class-ref="matis.component.filemanager.Folder"
auto-retrieve="true"
auto-update="true"
auto-delete="true"
indirection-table="INFOLD">
<fk-pointing-to-this-class column="FOL_ID_ELEMENT"/>
<fk-pointing-to-element-class column="ID_ELEMENT"/>
</collection-descriptor>
<reference-descriptor name="super"
class-ref="matis.component.filemanager.Element"
auto-retrieve="true"
auto-update="true"
auto-delete="true">
<foreignkey field-ref="id_Elem"/>
</reference-descriptor>
</class-descriptor>
When logging OJB's activity, I can see the query who raises the Oracle
exception (ORA-00918: column ambiguously defined), here it is:
SELECT A0.ID_FOLDER
FROM FM.FOLDER A0,INFOLD,FM.element A1,INFOLD
WHERE A0.ID_FOLDER=A1.ID_ELEMENT
AND ((INFOLD.FOL_ID_ELEMENT IN (?,?,?))
AND A0.ID_FOLDER = INFOLD.ID_ELEMENT)
I'm a bit lost since it's my first time using OJB (I hope it's not the
last).
Thanks a lot for reading my request and thanks in advance for your help.
Yours Sincerely,
Alexandre Thomas
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