Re: Object-relational impedence

S Perryman <q_at_q.com> wrote in news:fqn0ir$mdg$1_at_aioe.org:  > single objects.
>
> boolean f(Tuple t) { return (t.x = 123) ; }
>
> Set<Tuple> S ;
>
> Set<Tuple> t = S.match(f) ; // or match(S,f) if one prefers
>
> 1. How is the above not "set-oriented" ??
>
> A set is given as input to a match operation which produces a
> set as output.
>
>
> 2. I have no idea whatsoever *how* S performs the match by
> looking at the above.
>

'Match' is cool, but what about more interesting operations like 'project(join(R1,R2)), R1.a1, R2.b3)' where R1 is a set of <c,a1,a2,a3> tuples and R2 is a set of <c, b1,b2,b3> tuples ? How do you express that in your fav OO language ? Received on Thu Mar 06 2008 - 05:10:31 CET