On Tue, 2008-03-11 at 14:41 -0400, [EMAIL PROTECTED] wrote:
> Hi Ian,
>
> Thanks. I just downloaded the latest darcs and will look at it. I've
> been evaluating different querying to propose a syntax.
>
> BTW, in the darcs I downloaded 10 minutes ago, I ran the tests and got:
>
> Did 421 checks.
> Pass: 420 (99%)
> Skip: 0 ( 0%)
> Fail: 1 ( 0%)
>
> Failure Details:
> --------------------------------
> THREADED-IDX-ACCESS []:
> Unexpected Error: #<SB-THREAD:JOIN-THREAD-ERROR {12B38DB1}>
> Joining thread failed: thread #<THREAD {12B1FEA9}> has not returned
> normally...
I had these errors as well. I assumed they were releated to my
architecture. Are you using SBCL?
We may have to disable these tests, but I would really rather have them
working under SBCL, if Leslie or some SBCL user can accomplish that.
>
> During the tests, I got a lot of errors on the threads about Null
> controller.
>
> Thanks,
> Daniel
>
> On Mar 11, 2008, at 12:05 PM, Ian Eslick wrote:
>
> > Daniel,
> >
> > I just promoted a simple sketch of a query interpreter and syntax on
> > the unstable branch that handles queries like:
> >
> > (query-select #'(lambda (person school) (format t "Person named: ~A
> > at ~A~%" (name person) (name school)))
> > '(select ((?p person) (?s school))
> > (where (and (> (age ?p) 10) (< (age ?p) 25))
> > (= ?s (school ?p))
> > (string> (name ?s) "Foo")))))
> >
> > This calls the provided function for all pairs of people and schools
> > for ages between 10 and 25 where the school name is alphabetically
> > greater than "Foo"
> >
> > If you load and evaluate src/elephant/query-example.lisp you can
> > play with this little hack.
> >
> > There are absolutely no performance considerations. It essentially
> > does the search through lisp objects that Robert alluded to. It
> > maps all instances of person and uses constraints like (= ?s
> > (school ?p)) to create the connection between objects via slot
> > values. You have to make sure that it can figure out what ?s is
> > before you can use ?s in another expression, so it's pretty
> > restrictive.
> >
> > Anyway, hopefully this will give you some ideas on how to get started!
> >
> > Ian
> >
> >
> > On Mar 6, 2008, at 8:23 AM, [EMAIL PROTECTED] wrote:
> >
> >>
> >> On Mar 4, 2008, at 10:38 PM, Ian Eslick wrote:
> >>
> >>> = A little query interpreter (Waldo?, Daniel?)
> >>> Read sets of oids from indices, implement an efficient in-memory
> >>> sort&merge over oids, and deserialize after the query. I've
> >>> specified a bunch of this so could provide a set of pointers to
> >>> start. Looking at some other object query languages and proposing
> >>> a syntax would be a good place to start
> >>
> >> Will definitely like to pick up on this again. Been doing some more
> >> reading and think should have some time to invest on this.
> >>
> >> - Daniel
> >> _______________________________________________
> >> elephant-devel site list
> >> elephant-devel@common-lisp.net
> >> http://common-lisp.net/mailman/listinfo/elephant-devel
> >
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