Looking at Cayenne code, the error message describes exactly what
happens: "BOOKS" DbEntity doesn't have a single attribute marked as PK.
> tick marking the necessary column in the Attributes table and
> generating schema
Looks like you are doing the right thing here, just make sure that all
latest Cayenne *.xml and *.map.xml files are copied to the right
deployment location. Looks like you may have the old version of
*.map.xml somewhere.
Andrus
On Apr 12, 2004, at 10:50 AM, Eric Schneider wrote:
> Karthik,
>
> I'm not sure how the DB2 adaptor handles its auto pk generation
> stuff. I'm guessing it uses an auto_pk table (similar to MySQL).
>
> Try this. Make sure that your PK attributes defined in your DBEntity
> are NOT defined in your ObjEntity. If pk attributes are included in
> the ObjEntity, Cayenne assumes that you will provide the pk value.
>
> Hope this helps,
> Eric
> ----- Original Message -----
> From: Karthik Krishnan
> To: cayenne-use..bjectstyle.org
> Sent: Monday, April 12, 2004 10:05 AM
> Subject: Newbie Question?!
>
> Hello!
> I currently want to use Cayenne in my project and am in the
> process of exploring Cayenne.But then I have got stuck up now with one
> exception. I am using DB2 as the database. The thing is the tables I
> am doing the project on,doesnt have a primary key.As a result, I tried
> to use the Auto PK generation feature in Cayenne Modeller(tick marking
> the necessary column in the Attributes table and generating schema).
> But whatever I do, I get the following exception
> org.objectstyle.cayenne.CayenneRuntimeException: [v.1.1M4 March 5
> 2004] Can't create ObjectId for 'Books'. Reason: DbEntity 'BOOKS' has
> no Primary Key defined.
> at
> org.objectstyle.cayenne.access.DataContext.objectsFromDataRows(DataCont
> ext.java:614)
> at
> org.objectstyle.cayenne.access.util.SelectObserver.getResultsAsObjects(
> SelectObserver.java:190)
> at
> org.objectstyle.cayenne.access.DataContext.performQuery(DataContext.jav
> a:1200)
> at BookCheck.getBook(Bookcheck.java:38)
> at BookCheck.main(Bookcheck.java:28)
> Exception in thread "main"
>
>
> I searched for possible solutions in the mailing lists but I was not
> able to find any solution..Any pointers would be helpful.
>
> Thanks in Advance!
>
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