Re: Object-relational impedence
Date: Wed, 19 Mar 2008 17:15:52 +0000
Message-ID: <frrhoq$q20$1_at_aioe.org>
Marshall wrote:
> On Mar 19, 6:14 am, Bob Badour <bbad..._at_pei.sympatico.ca> wrote:
>>I am not sure how Eric gets from there to EAV, and I think that's highly
>>speculative on Eric's part
> Some of the things Mr. Perryman said led me to believe he was
A standards body basically defined resource types of the form :
type T
Attr1 = string
There were 100+ resource types, and at least 100+ attr types.
Which types had which attrs, and whether they were mandatory (belonging
to all instances of a types) , or optional (present on a per-instance
basis) was defined by the standards body (for the perversely-interested,
here is one such spec for telecoms call data recording :
http://www.itu.int/ITU-T/formal-language/gdmo/database/itu-t/q/q825/1998/q825.html)
> discussing an EAV design. When I tried to either verify or dispel
> my impression by reviewing the thread, I wasn't able to either way.
> But I it seems I got a similar impression to Eric's.
{
Attr1
Attr2
// etc
}
Attr2 = Sequence<SomeNastyRecordType>
Their mandated impl technology : SQL RDBMS.
Regards,
Steven Perryman
Received on Wed Mar 19 2008 - 18:15:52 CET