You mapping looks good for me, as well as your Consultant class..
About exeption: an exception what i tolking about shouldl be thrown if you
trying to access an element of lazily loaded collection outside a
transaction when it was loaded.
I mean:
db.begin();
OQLQuery objects = db.getOQLQuery(stmt_select);
QueryResults results = objects.execute();
Consultant cons = (Consultant)results.next();
Iterator it = cons.getGrades().iterator();
while(it.hasNext()) {
Grade g =(Grade)it.next();
System.out.println(g.toString());
}
db.commit();
this will work fine. But this will throw an exection:
db.begin();
OQLQuery objects = db.getOQLQuery(stmt_select);
QueryResults results = objects.execute();
Consultant cons = (Consultant)results.next();
db.commit();
Iterator it = cons.getGrades().iterator();
while(it.hasNext()) {
Grade g =(Grade)it.next();
System.out.println(g.toString());
}
Hope this will help.
----- Original Message -----
From: "Alexandre Hoang" <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Sent: Friday, March 07, 2003 12:34 PM
Subject: Re: [castor-dev] Lazy loading - how to be sure ?
> OK thanks.
>
> I only have this exception: java.lang.ClassCastException. So I don't have
> lazy loading.
>
> Coud you just confirm to me that, to implement lazy loading, for the
> "Consultant" class I have to:
>
> A- set "lazy" to "true", like this:
> ---------------
> <class name="Consultant" identity="consID" key-generator="IDENTITY">
> <map-to table="CONSULT"/>
> ...
> <field name="grades" type="Grade" lazy="true" collection ="collection" >
> <sql many-key="CONSID" />
> </field>
> </class>
> ---------------
>
> B- and write my Consultant class like this:
> ---------------
> public class Consultant {
> ...
> private Collection grades = new ArrayList();
> ...
> public Collection getGrades() {
> return this.grades;
> }
> public void setGrades(Collection g) {
> this.grades = g;
> }
> public void addGrade(Collection g) {
> this.grades.add(g);
> }
> }
> ---------------
>
>
>
> Thanks !
>
> Alexandre
>
>
> -----Message d'origine-----
> De : Denis Sukhoroslov [mailto:[EMAIL PROTECTED]
> Envoyé : vendredi 7 mars 2003 10:24
> À : [EMAIL PROTECTED]
> Objet : Re: [castor-dev] Lazy loading - how to be sure ?
>
>
> An error skack should look like:
>
> java.lang.RuntimeException: Transaction is closed!
> at org.exolab.castor.persist.RelationCollection$IteratorImp.lazyLoad
> ..........................
>
>
> ----- Original Message -----
> From: "Alexandre Hoang" <[EMAIL PROTECTED]>
> To: <[EMAIL PROTECTED]>
> Sent: Friday, March 07, 2003 11:58 AM
> Subject: Re: [castor-dev] Lazy loading - how to be sure ?
>
>
> > Hello,
> >
> > In order to check if my objects of the class "Consultant" are lazily
> loaded,
> > I have written this piece of code:
> > ------------------
> > QueryResults results = query.execute();
> > Consultant cons = new Consultant();
> > cons = (Consultant)results.next();
> >
> > Object[] objArray = cons.getGrades().toArray();
> >
> > Iterator it = cons.getGrades().iterator();
> > while(it.hasNext()) {
> > Grade g =(Grade)it.next();
> > System.out.println(g.toString());
> > }
> > ------------------
> > When I set lazy="false" in the mapping file, this piece of code is OK.
> > When I set lazy="true", I have an exception with the line:
> > "Object[] objArray = cons.getGrades().toArray();"
> > Is it a reasonable piece of evidence that my "Consultant" objects are
> lazily
> > loaded ?
> >
> >
> > Thanks,
> >
> > Alexandre
> >
> >
> >
> >
> > -----Message d'origine-----
> > De : Denis Sukhoroslov [mailto:[EMAIL PROTECTED]
> > Envoyé : jeudi 6 mars 2003 18:04
> > À : [EMAIL PROTECTED]
> > Objet : Re: [castor-dev] Lazy loading - how to be sure ?
> >
> >
> > Yes. If this collection is lazily loaded you should get an exception on
> > line: Grade g =(Grade)it.next();
> >
> > ----- Original Message -----
> > From: "Alexandre Hoang" <[EMAIL PROTECTED]>
> > To: <[EMAIL PROTECTED]>
> > Sent: Thursday, March 06, 2003 7:09 PM
> > Subject: [castor-dev] Lazy loading - how to be sure ?
> >
> >
> > > Hello,
> > >
> > > Sorry for the dumb question, but I need to know...
> > >
> > > I have modified my "mapping.xml" file and my classes to enable lazy
> > loading.
> > > I can save my objects and load them correctly.
> > > But is there a (simple) way I can verify that my objects are really
> loaded
> > > lazily ?
> > > --------------
> > > In this case, I have :
> > >
> > > cons = (Consultant)results.next();
> > > Collection al = cons.getGrades();
> > > Iterator it =al.iterator();
> > > while(it.hasNext()) {
> > > Grade g =(Grade)it.next();
> > > System.out.println(g.getSkill());
> > > }
> > >
> > > --------------
> > > Thanks,
> > >
> > > Alexandre
> > >
> > >
> > >
> > >
> > >
> > > * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
*
> *
> > *
> > > Confidentiality Notice :
> > > The information contained in this e-mail message is intended only for
> the
> > > personal and confidential use of the recipient(s) named above. If the
> > reader
> > > of this message is not the intended recipient or an agent responsible
> for
> > > delivering it to the intended recipient, you are hereby notified that
> you
> > > have received this document in error and that any review,
dissemination,
> > > distribution, or copying of this message is strictly prohibited. If
you
> > have
> > > received this communication in error, please notify
> [EMAIL PROTECTED]
> > > immediately by e-mail, and delete the original message.
> > > * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
*
> *
> > *
> > >
> > > -----------------------------------------------------------
> > > If you wish to unsubscribe from this mailing, send mail to
> > > [EMAIL PROTECTED] with a subject of:
> > > unsubscribe castor-dev
> > >
> >
> > -----------------------------------------------------------
> > If you wish to unsubscribe from this mailing, send mail to
> > [EMAIL PROTECTED] with a subject of:
> > unsubscribe castor-dev
> >
> >
> >
> >
> > * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
*
> *
> > Confidentiality Notice :
> > The information contained in this e-mail message is intended only for
the
> > personal and confidential use of the recipient(s) named above. If the
> reader
> > of this message is not the intended recipient or an agent responsible
for
> > delivering it to the intended recipient, you are hereby notified that
you
> > have received this document in error and that any review, dissemination,
> > distribution, or copying of this message is strictly prohibited. If you
> have
> > received this communication in error, please notify
[EMAIL PROTECTED]
> > immediately by e-mail, and delete the original message.
> > * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
*
> *
> >
> > -----------------------------------------------------------
> > If you wish to unsubscribe from this mailing, send mail to
> > [EMAIL PROTECTED] with a subject of:
> > unsubscribe castor-dev
> >
>
> -----------------------------------------------------------
> If you wish to unsubscribe from this mailing, send mail to
> [EMAIL PROTECTED] with a subject of:
> unsubscribe castor-dev
>
>
>
>
> * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
*
> Confidentiality Notice :
> The information contained in this e-mail message is intended only for the
> personal and confidential use of the recipient(s) named above. If the
reader
> of this message is not the intended recipient or an agent responsible for
> delivering it to the intended recipient, you are hereby notified that you
> have received this document in error and that any review, dissemination,
> distribution, or copying of this message is strictly prohibited. If you
have
> received this communication in error, please notify [EMAIL PROTECTED]
> immediately by e-mail, and delete the original message.
> * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
*
>
> -----------------------------------------------------------
> If you wish to unsubscribe from this mailing, send mail to
> [EMAIL PROTECTED] with a subject of:
> unsubscribe castor-dev
>
-----------------------------------------------------------
If you wish to unsubscribe from this mailing, send mail to
[EMAIL PROTECTED] with a subject of:
unsubscribe castor-dev
