Hi Ian,
I read the thread from a few days ago regarding OIDs. While I agree with your
position, I think it's beneficial to be able to get a list of OIDs to be able
to perform these kinds of operations. I think the premise from the other thread
was that of "relying" on OIDs for relational purpos
That's very insightful and quite correct! I was going to use this
mechanism as part of the query system I want to get working for 1.0.
This is pretty much the mechanism that relational databases use to do
join queries and Elephant will be no different.
As a matter of discipline, I didn't
Please excuse if I don't make a direct reference to Elephant solving this in my
comment below. However, I remembered reading something just like this in
AllegroCache's Reference Manual, in which it said, and I quote:
"In a database every object has a unique object identifier (oid). This value
c
Ignas,
The easiest way to do this is to follow Robert's suggestion, and
declare slots x and y to be indexed (assuming your parameters are
slot values of a persistent objects) and then say:
(remove-duplicates
(nconc (get-instances-by-range 'my-class 'x 10 20)
(get-instances-by-ran
I'm assuming x and y are properites of a data object, which has some
other component z which
you with to retrieve, and you query is that you want to find all the
records (x,y,z) such that
(10 < x < 20) and ( -5 < y < 15).
There is a spectrum of solutions to this problem. However, in the
general
Hi, i have an interesting usecase and i would like to ask whether i
can solve it by using Elephant. I would like to index objects placed
on a discreet 2d grid of an arbitarry size, which would require
queries like (10 < x < 20) AND (-5 < y < 15).
Is it possible to perform such a query with elep
