sure, why not? if you don't have a collection-descriptor for a given attribute, it won't be persisted to the db.
You can fill the workstations attribute with broker.getCollectionByQuery(...) cheers, Thomas > -----Urspr�ngliche Nachricht----- > Von: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]] > Gesendet: Montag, 20. Januar 2003 16:31 > An: [EMAIL PROTECTED] > Betreff: RE: How to represent a collection of objects in OJB > > > Hi Thomas, > > With your solution you store the collection "workstations" in > the database, right? > In fact I don't need to store this collection because it's a > dynamic result of a query to the Workstation table. > > Is there a solution without using the database? > > Regards > Sylvain > > > -----Message d'origine----- > De: Mahler Thomas [mailto:[EMAIL PROTECTED]] > Date: lundi, 20. janvier 2003 15:16 > �: 'OJB Users List' > Objet: RE: How to represent a collection of objects in OJB > > > Hi, > > > Hello, > > > > I'm using OJB and I'm asking something: > > > > I have a class called Workstation that represent a > > workstation. There is a table "Workstation" in the database > > and OJB provides the link between. > > > > My question is: > > I need to represent a collection (or a Node) of workstations > > in the class Workstation because I use this class as a model > > in a MVC environment. > > Is it possible? > > Yes. OJB can handle such reursive associations without problems. > > > How to do that without causing problem in the mapping? > > 1. add a collection attribute "workstations" to the class Workstation > this collection will hold the associated workstations. > > 2. you have to decide wether this assosciation is 1:n or m:n. > for 1:n you just need an additional foreignkey attribute in > the WORKSTATION > table. > Of course you'll also need a matching attribute in the class > Workstation. > > For a m:n association you'll have to define a intermediary > table to hold the > mapping entries. > > 3. define a collection-descriptor in repository.xml. > Follow the steps in tutorial3.html on 1:n and m:n. > > > cheers, > Thomas > > > > > > Thank you > > Sylvain > > > > -- > > To unsubscribe, e-mail: > > <mailto:[EMAIL PROTECTED]> > > For additional commands, e-mail: > > <mailto:[EMAIL PROTECTED]> > > > > > > > -- > To unsubscribe, e-mail: > <mailto:[EMAIL PROTECTED]> > For additional commands, e-mail: > <mailto:[EMAIL PROTECTED]> > > > -- > To unsubscribe, e-mail: > <mailto:[EMAIL PROTECTED]> > For additional commands, e-mail: > <mailto:[EMAIL PROTECTED]> > > -- To unsubscribe, e-mail: <mailto:[EMAIL PROTECTED]> For additional commands, e-mail: <mailto:[EMAIL PROTECTED]>
