Re: Object-relational impedence
Date: Mon, 03 Mar 2008 17:36:50 GMT
"Roy Hann" <specially_at_processed.almost.meat> wrote in message
> "Thomas Gagne" <tgagne_at_wide-open-west.com> wrote in message
> > JOG wrote:
> >> I wondered if we might be able to come up with some agreement on what
> >> object-relational impedence mismatch actually means. I always thought
> >> the mismatch was centred on the issue that a single object != single
> >> tuple, but it appears there may be more to it than that.
> > The issue as I've discovered it has to do with the fact OO systems are
> > composed of graphs of data and RDBs are two-dimensional.
> RDBs are not two-dimensional, they are n-dimensional. You are confusing
> picture of the thing with the thing. I have a three dimensional kitchen
> table. I have an RDB table with three columns (dimensions) called length,
> width and height that describes it.
Stop! You're both right! level of abstraction where the OO RM impedance match comes about.
> I completely, 100% agree with that. Code is evil.
It appears, from reading c.o., that OO people regard data structures as evil.