[redland-dev] is librdf really posing SPARQL queries against Virtuoso?

[lorena]

As stated here http://librdf.org/docs/api/redland-storage-module-virtuoso.html

"The Virtuoso Redland RDF Provider is an implementation of the Storage
API, Model and Query interfaces of the Redland framework for RDF. This
provider enables the execution of queries via the Redland Rasqal query
engine or via Virtuoso query engine directly against the Virtuoso
OpenSource Quad Store."

So I just have to figure out how to skip Rasqal and execute the
queries directly against Virtuoso.

Any hints would be appreciated

Lorena

On Tue, Mar 20, 2012 at 9:40 PM, lorena <lorenae at fing.edu.uy> wrote:
> Hi:
>
> I'm trying to use librdf to execute SPARQL queries over Virtuoso.
> But, after getting errors trying to use some functions such as
> fn:substring (having the fn prefix declared inside the query) I've
> decided to take a look at Virtuoso's log (after enabling Virtuoso log
> features using trace_on())
>
> To my surprise, although I successfully retrieve results, some of the
> queries I perform are not logged at all, and other queries are similar
> to the ones I intend to pose but are not the same.
> Moreover, I've tested my queries using Virtuoso Conductor web client
> and they run as expected.
>
> So, my questions are the following: is librdf doing some parsing or
> re-writing on my queries? Is it somehow "loading" the model from
> Virtuoso and using its own querying capabilities to execute my
> queries? If so, how can I skip this step in order to force Virtuoso to
> process the queries?
>
> thanks in advance
> Lorena
>
> --
> Lorena Etcheverry



-- 
Lorena Etcheverry