Hi,
I am now more confused than before. There is no doubt
that both, the EJB book and the Java tool, were my
right decision.
However I stuck now here and want get out of this
problem.
William, is it possible that I send you the project?
Best regards,
Darya
--- Richard Monson-Haefel <[EMAIL PROTECTED]>
wrote:
> William,
>
> I see you took personal offense to my response,
> which wasn't my intention.
> Sorry, if you were insulted. I'm still convinced,
> however, that your
> problem is fundamentally a limitation of the tool.
> The example works fine.
>
> Anyway, the 2nd Edition of the book explains why I
> use compound primary keys
> for even simple "int" keys. It was designed as
> teaching tool so that bean
> developers could learn how to work with compound
> primary keys. In addition,
> I felt at the time that compound primary keys
> provide a distinct advantage
> even with single fields since they hide the physical
> manifestation of the
> primary key in the database. Using single-field
> primary keys like Integer
> types doesn't. The introduction of deferred primary
> keys in EJB 1.1
> provided a better solution, but not all the vendors
> supported this option so
> I decided not to use it.
>
> The 3rd edition of the book (which you can review at
> http://oreilly.techrev.org/ ) doesn't use compound
> primary keys very much
> because its easier for developers new to EJB to use
> single-field keys. I
> think this is a good improvement to the book. The
> third edition does take
> advantage of deferred primary keys in EJB 2.0 CMP to
> allow encapsulation of
> unknown primary keys, which is possible now because
> more vendors will be
> supporting this option.
>
> I hope that explanation is sufficient.
>
> Thanks,
>
> Richard
>
> [EMAIL PROTECTED] wrote:
>
> > Richard,
> >
> > First off I think you should be a bit more careful
> in proclaiming this
> > to be some limitation in a tool or server (where
> the server aspect came
> > I don't know). I have used JBuilder since EJB 1.1
> prior to joining
> > Borland and found it to be quite a productive EJB
> environment unlike
> > the rest of the tools on the market. Note I have
> worked with WebLogic,
> > Websphere, Silverstream and NetDynamics earlier on
> in my career.
> >
> > I have never encountered a problem with PKs used
> with ints or Integers
> > within this environment. In fact Borland AppServer
> supports beans with
> > primitives as PK's as do the deployment tools.
> JBuilder does not
> > restrict the bean provider but maybe the db-to-ejb
> wizard does not
> > always get it right especially when you use a PK
> which is simply
> > wrapping a int. Possibly the wizard was simply
> saying why bother with
> > this silly little pk class when you can have a
> Integer which already
> > has a correct hashcode and equals implementation.
> It could be many
> > things especially when its a wizard and the user
> is providing the input
> > into the steps.
> >
> > Its good to see that you have moved away from this
> in your current book
> > especially when they were not warranted in most
> cases though I do
> > understand your motives, or was it a limitation in
> the tools and server
> > you were using to write and test the examples
> with....... ;-)
> >
> > regards,
> >
> > William
> >
> > ----- Original Message -----
> > From: Richard Monson-Haefel
> <[EMAIL PROTECTED]>
> > Date: Tuesday, July 10, 2001 2:32 pm
> > Subject: Re: Not 'int' but 'Integer' in Cabin
> example by Richard Monson-
> > Haefel
> >
> > > Hi,
> > >
> > > Literally tens of thousands of people have run
> the examples in the
> > > book with
> > > out a problem. It must be a limitation of your
> tools and or
> > > server. You can
> > > change your examples to use Integer if that
> works better with your
> > > tool.
> > > Note: In the 3rd Edition of the book
> (http://oreilly.techrev.org/)
> > > I also use
> > > single-field primary keys a lot since that seems
> to be easier for
> > > people new to
> > > EJB. However, compound primary keys are still
> valuable in many cases.
> > >
> > > Thanks!
> > >
> > > Richard
> > > --
> > > Richard Monson-Haefel
> > > Author of Enterprise JavaBeans, 2nd Edition
> (O'Reilly 2000)
> > > Co-Author of Java Message Service (O'Reilly
> 2000)
> > > http://www.jMiddleware.com
> > >
> > > Darya Said-Akbari wrote:
> > >
> > > > Hi,
> > > >
> > > > I wonder that anybody could run the Cabin
> example from
> > > > chapter 4 of Richard Monson-Haefel EJB book.
> > > >
> > > > In the CabinPK class he use 'int' instead of
> 'Integer'
> > > > for declaration. Shouldn't it be 'Integer'
> since
> > > > CabinPK implements the Serializable interface?
> > > >
> > > > When you try it opposite, to model your Cabin
> EJB
> > > > begining with your Database table CABIN, then
> the
> > > > JBuilder4 wizard only use Integer instead of
> int.
> > > >
> > > > If anyone could run the example like given in
> the
> > > > book,
> > > > please let me know.
> > > >
> > > > Best regards,
> > > > Darya
> > > >
> > > >
> __________________________________________________
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> > > >
> > >
> >
>
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> >
>
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> > ===
> > > To unsubscribe, send email to
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> > >
> > >
>
> --
> Richard Monson-Haefel
>
=== message truncated ===
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