rdfapi-php-interest

[Rdfapi-php-interest] problem with results

[nic12 <ni...@gm...>]

Hi there,

I have a problem with the SPARQL interpreter of RAP.
I want to query a model with this SPARQL query:

SELECT DISTINCT ?class
WHERE { ?x rdf:type ?class}
ORDER BY ?class
LIMIT 50
OFFSET 0

but the result is not the one I expect.

I got under 50 solutions (so i thought there are not more than 50
solutions) but if use an OFFSET of 50 or so, i got more results.

I think, the DISTINCT search is the problem.
Am I wrong or it is a bug?

E.Popp

Re: [Rdfapi-php-interest] problem with results

[Christian W. <cw...@cw...>]

Enrico,


> but the result is not the one I expect.
> I got under 50 solutions (so i thought there are not more than 50
> solutions) but if use an OFFSET of 50 or so, i got more results.

Is this when iterating from 0 to 50 over the array? The result keys are
not in a row, they may have "holes" in them:
array(0 =3D> (), 1 =3D> (), 5 =3D> (), 6 =3D> (), 7 =3D>())

Or is the count($array) wrong?

--=20
Regards/Mit freundlichen Gr=FC=DFen
Christian Weiske

Re: [Rdfapi-php-interest] problem with results

[nic12 <ni...@gm...>]

Christian Weiske wrote:

>Enrico,
>
>
>  
>
>>but the result is not the one I expect.
>>I got under 50 solutions (so i thought there are not more than 50
>>solutions) but if use an OFFSET of 50 or so, i got more results.
>>    
>>
>
>Is this when iterating from 0 to 50 over the array? The result keys are
>not in a row, they may have "holes" in them:
>array(0 => (), 1 => (), 5 => (), 6 => (), 7 =>())
>
>Or is the count($array) wrong?
>
>  
>
The count($array) is wrong and the first index of $array should go 0 up
to 50. If  the index is greater than 50 the process is stopped. The
problem is that the sparql-query specification say's:
"If |DISTINCT| and |LIMIT| or |OFFSET| are specified, then duplicates
are eliminated before the limit or offset is applied."
but the RAP do not so. I think the RAP works so. The Limit and OFFSET
restrict the Statements and now  DISTINCT operates on these "subgraph".

Enrico