On Mon, 19 Feb 2001, Robert Krueger wrote:
> Hi,
>
> after reading through chapter 9 of EJB 2.0pfd (chapter on CMP) I have some
> rather fundamental questions.
>
> In our datamodels we frequently encounter relationships that have
> attributes themselves. Let's take the hypothetical example of a security
> system that models doors of a building and people's access rights. Every
> person gets an individual PIN for each door (sorry, couldn't come up with a
> less artificial example ;).
>
> Say I have an entity Person and an Entity Door and a relationship
> PersonDoorAccess with multiplicity many-many. Then things like lastAccessed
> and PIN would be modelled as an attribute of that relationship. I don't see
> any way of doing that using EJB2.0 CMP except for modeling the relationship
> PersonDoorAccess as an entity itself.
It sounds like a dependent of either Person or Door to me.
>
> Is there an obvious reason why relationship attributes don't seem to be
> supported? Is my modeling approach wrong?
>
> It would be great if anyone who's closer to the specifcation process could
> enlighten me where my mistake is.
I'm no closer to the spec. process than you, but I have heard rumors that
there will be substantial changes before the spec. is final.
>
> Thanks in advance,
>
> Robert
>
>
> (-) Robert Kr�ger
> (-) SIGNAL 7 Gesellschaft f�r Informationstechnologie mbH
> (-) Br�der-Knau�-Str. 79 - 64285 Darmstadt,
> (-) Tel: 06151 665401, Fax: 06151 665373
> (-) [EMAIL PROTECTED], www.signal7.de
>
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--
Dan Christopherson (danch)
nVisia Technical Architect (www.nvisia.com)
Opinions expressed are mine and do not neccessarily reflect any
position or opinion of nVISIA.
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