On 14/10/11 09:38, Dave Reynolds wrote:
On Thu, 2011-10-13 at 09:36 -0430, Israel wrote:
Hi there,
....
Here's the chunk of code there I try to do this:
String construct = "CONSTRUCT { ?s ?p ?o } FROM<http://thesis.com#> WHERE {
?s ?p ?o }";
I'm not sure how Virtuoso handles named graphs but the correct way to
pick one graph from many in SPARQL is to use GRAPH:
CONSTRUCT { ?s ?p ?o }
WHERE {
GRAPH <http://thesis.com#> { ?s ?p ?o }
}
VirtuosoQueryExecution vqe2 =
VirtuosoQueryExecutionFactory.create(construct, graph);
If graph is a model, then what Virtuoso should do is to make that graph
the default graph for the query in which case:
CONSTRUCT { ?s ?p ?o }
WHERE { ?s ?p ?o }
should work. Otherwise, please report it to OpenLink.
A dataset, not a model would be better, then use the GRAPH form.
The above is all Virtuso-specific so you'll need to ask them for support
for that.
Dave
An alternative is to treat the Virtuoso server as a SPARQL endpoint and
use QueryExecutionFactory.sparqService
Andy
