----- Original Message ----- From: "Wouter Zoons" <[EMAIL PROTECTED]> To: "Greg Johnson" <[EMAIL PROTECTED]>; "'Users AndroMDA'" <[EMAIL PROTECTED]> Sent: Friday, June 18, 2004 5:51 PM Subject: Re: [Andromda-user] 3.0m2 hibernate cartridge fails if <<entity>> does not declare a <<primary key>>
> hi Greg, > > my comments are inserted below > > > Greg Johnson wrote: > > > hi wouter, > > thanks for your reply - understand. > > > > i was using the hibernate documentation that says: > > > > "The identifier property is optional. You can leave it off and let > > Hibernate > > keep track of object identifiers internally. However, for many > > applications it > > is still a good (and very popular) design decision." > > > ah good to know, I'll have to investigate this a little more. > > > which would seem to be ok for a composite association. but then, as > > you point > > out, hibernate requires either an id or compoiste id for any mapped > > class. > > > > i guess if you wanted to be pedantic, you should not need to declare a > > <primary > > key> in the pim, and have the hibernate cartridge allocate the id. > > > > good that you bring up this issue because I too find it strange to have > to declare the PrimKey in the PIM, as it is not part of any business > object's properties > > > while on the subject of hibernate, the sterotype name <entity> is a bit > > misleading. > > > > strictly, <entity> should be reserved for first class objects only > > (compare with > > <value object>) and not have an overloaded implication of persistence. > > > > as the hibernate docs say: > > "An entity exists independently of any other objects holding > > references to the > > entity." and "Unlike entities, values (in particular collections and > > components) are persisted and deleted by reachability" > > > > ie there should be a separate stereotype <persistent> which can be > > applied to > > either <entity> or <value object> classes. > > > > very good, I like this ... good timing too, because if we decide to have > new stereotype names we will need to fix them asap (before milestone 2) > I would like to have Matthias' response to this one though, as I am not > alone to decide > > I vote for! anyone else ? +1 for me as well! > > > > thanks again, > > > cheers > -- Wouter > > > > > ------------------------------------------------------- > This SF.Net email is sponsored by The 2004 JavaOne(SM) Conference > Learn from the experts at JavaOne(SM), Sun's Worldwide Java Developer > Conference, June 28 - July 1 at the Moscone Center in San Francisco, CA > REGISTER AND SAVE! http://java.sun.com/javaone/sf Priority Code NWMGYKND > _______________________________________________ > Andromda-user mailing list > [EMAIL PROTECTED] > https://lists.sourceforge.net/lists/listinfo/andromda-user ------------------------------------------------------- This SF.Net email is sponsored by The 2004 JavaOne(SM) Conference Learn from the experts at JavaOne(SM), Sun's Worldwide Java Developer Conference, June 28 - July 1 at the Moscone Center in San Francisco, CA REGISTER AND SAVE! http://java.sun.com/javaone/sf Priority Code NWMGYKND _______________________________________________ Andromda-user mailing list [EMAIL PROTECTED] https://lists.sourceforge.net/lists/listinfo/andromda-user
