Hi Brian, exactly. Due to copy & paste I assigned a wrong column to the attribute activityId in class Person. But know I experience the problem, that each created activity is stored twice (with different id's). I mean, I know why, I add activity once to the 'person collection' and to the 'venture collection' and do then pm.store(venture) and pm.store(person). I guess I have to follow a different approach?! Say, store first venture, then retrieve activity to store it with person? or how does it work?
thx, Dirk -----Ursprüngliche Nachricht----- Von: Brian McCallister [mailto:[EMAIL PROTECTED] Gesendet: Mittwoch, 14. Januar 2004 18:33 An: OJB Users List Betreff: Re: AW: Two 1:N mappings to one table It sounds like there is actually a problem in the mapping from class -> table where the activityId is listed. Any chance you could post the full mapping for these classes, along with the database schema? -Brian On Jan 14, 2004, at 11:33 AM, Dirk Manske (Service Respond) wrote: > Hi, > > yes, i am using pb. Setting auto-retrieve="true" in the > collection-descriptor has not the desired effect, I still get the > following two strange error messages: > > within browser it shows a null pointer execption for Venture when it > tried to retrieve all venture objects associated with activity and in > the tomcat console I get a SQL Exception for class PERSON, state that > activityId is not valid in the context where it is used (db2 database > error message). > > When I set auto-retrieve="false" for PERSON in the > reference-descriptor of class ACTIVITY, the venture objects are > retrieved. no error message. > everything works fine, except - of course I have no person objects > then. > > any idea? > > Dirk > > > > > -----Ursprüngliche Nachricht----- > Von: Brian McCallister [mailto:[EMAIL PROTECTED] > Gesendet: Mittwoch, 14. Januar 2004 15:13 > An: OJB Users List > Betreff: Re: Two 1:N mappings to one table > > Mapping to 1:N's to the same table is fine, heack mapping 1:N's form > one class to itself multiple times works fine. > > From looking at your configs I will venture that you are using the PB > API and one of the collections isn't loading -- try setting > auto-retrieve on the collections, or (these are exclusive) try using > the ODMG API (which will retrieve them automagically) > > -Brian > > On Jan 13, 2004, at 7:58 PM, Dirk Manske wrote: > >> Hi, >> >> how can I map two tables with each having a 1:N relation to the same >> table? >> I always get a null pointer exception for class Person. >> >> I have three tables: >> >> PERSON with a 1:N relation to ACTIVITY >> >> and >> >> VENTURE with a 1:N relation to ACTIVITY >> >> Table PERSON and VENTURE both references activityId from table >> ACTIVITY. In the repository-user.xml for each table which relates to >> ACTIVITY the collection-descriptor is setup >> >> for table VENTURE: >> >> <collection-descriptor >> name="allAssignedActivities" >> element-class-ref="de.plato.Activity" >> orderBy="activityId" >> sort="DESC" >> auto-update="true" > >> <inverse-foreignkey field-ref="ventureId" /> </collection-descriptor> >> >> and for table PERSON: >> >> <collection-descriptor >> name="allAssignedActivities" >> element-class-ref="de.plato.Activity" >> orderBy="activityId" >> sort="DESC" >> auto-update="true" > >> <inverse-foreignkey field-ref="personId" /> </collection-descriptor> >> >> for ACTIVITY, both tables are referenced: >> >> <reference-descriptor name="person"> >> class-ref="de.plato.Person" >> refresh="true" >> auto-retrieve="true"> >> <foreign-key field-ref="personId" /> >> >> and >> >> <reference-descriptor name="venture"> class-ref="de.plato.Venture" >> refresh="true" >> auto-retrieve="true"> >> <foreign-key field-ref="ventureId" /> >> >> Unfortunately, this does not work. What do I have to do? >> >> thx, >> Dirk >> >> >> --------------------------------------------------------------------- >> To unsubscribe, e-mail: [EMAIL PROTECTED] >> For additional commands, e-mail: [EMAIL PROTECTED] >> >> > > > > --------------------------------------------------------------------- > To unsubscribe, e-mail: [EMAIL PROTECTED] > For additional commands, e-mail: [EMAIL PROTECTED] > > > --------------------------------------------------------------------- > To unsubscribe, e-mail: [EMAIL PROTECTED] > For additional commands, e-mail: [EMAIL PROTECTED] > > --------------------------------------------------------------------- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] --------------------------------------------------------------------- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
