Hi Chris,
Jena functions as a triple rather than quad store by default, so it will query
over the default graph only "by default" . If you want to execute a query
againts all graphs in Virtuoso, you must call the VirtGraph method
"setReadFromAllGraphs(true)” to scope it to all graphs as below:
VirtGraph vg = new VirtGraph ("mygraph",
"jdbc:virtuoso://localhost:1111", "dba", "dba");
vg.setReadFromAllGraphs(true);
QueryExecution vqe = VirtuosoQueryExecutionFactory.create ("SELECT *
WHERE { GRAPH ?graph { ?s ?p ?o } } limit 100", vg);
The methods is documented in the Virtuoso Jena Provider Java docs at:
http://docs.openlinksw.com/jena2/ <http://docs.openlinksw.com/jena2/>
Best Regards
Hugh Williams
Professional Services
OpenLink Software, Inc. // http://www.openlinksw.com/
Weblog -- http://www.openlinksw.com/blogs/
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Universal Data Access, Integration, and Management Technology Providers
> On 12 Mar 2015, at 10:21, Chris Rimmer <chris.rim...@67bricks.com> wrote:
>
> I have a workaround. It seems if I set the names of the graphs using a VALUES
> clause like so, it works:
>
> SELECT ?s ?p ?o
> WHERE {
> VALUES (?to ?from) {(<first-graph-uri> <second-graph-uri>)}
> GRAPH ?from {
> ?s rdf:type skos:Concept .
> ?s ?p ?o .
> }
> MINUS {
> GRAPH ?to {
> ?s ?p ?o .
> }
> }
> }
>
> Chris
>
> On 12 March 2015 at 09:27, Chris Rimmer <chris.rim...@67bricks.com
> <mailto:chris.rim...@67bricks.com>> wrote:
> Hugh,
>
> I'm using the Virtuoso Jena Provider.
> The version of Virtuoso is 07.10.3211, the Virtuoso Jena Provider jar is
> version 1.10, the JDBC jar is version 3.76 and the version of Jena itself is
> 2.12.1.
>
> Chris
>
> On 11 March 2015 at 17:27, Hugh Williams <hwilli...@openlinksw.com
> <mailto:hwilli...@openlinksw.com>> wrote:
> Hi Chris,
>
> How are you connecting Jena to Virtuoso, is this via is http client to the
> Virtuoso SPARQL endpoint or via the Virtuoso Jena Provider ? Also confirm the
> version of Virtuoso being used and if using the Jena Provider the version of
> it …
>
> Best Regards
> Hugh Williams
> Professional Services
> OpenLink Software, Inc. // http://www.openlinksw.com/
> <http://www.openlinksw.com/>
> Weblog -- http://www.openlinksw.com/blogs/
> <http://www.openlinksw.com/blogs/>
> LinkedIn -- http://www.linkedin.com/company/openlink-software/
> <http://www.linkedin.com/company/openlink-software/>
> Twitter -- http://twitter.com/OpenLink <http://twitter.com/OpenLink>
> Google+ -- http://plus.google.com/100570109519069333827/
> <http://plus.google.com/100570109519069333827/>
> Facebook -- http://www.facebook.com/OpenLinkSoftware
> <http://www.facebook.com/OpenLinkSoftware>
> Universal Data Access, Integration, and Management Technology Providers
>
>> On 11 Mar 2015, at 16:23, Chris Rimmer <chris.rim...@67bricks.com
>> <mailto:chris.rim...@67bricks.com>> wrote:
>>
>> I am running the following query to give me a list of triples which exist in
>> one graph but do not exist in another:
>>
>> SELECT ?s ?p ?o
>> WHERE {
>> GRAPH ?from {
>> ?s rdf:type skos:Concept .
>> ?s ?p ?o .
>> }
>> MINUS {
>> GRAPH ?to {
>> ?s ?p ?o .
>> }
>> }
>> }
>>
>> This works as expected when run via the Conductor SPARQL interface (with
>> ?from and ?to bound correctly) and also works via Jena operating against an
>> in-memory TDB datastore. But when run via Jena against Virtuoso I get no
>> results at all.
>>
>> Any clue as to what is going wrong here?
>>
>> Thanks
>>
>> Chris
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>
>
> ------------------------------------------------------------------------------
> Dive into the World of Parallel Programming The Go Parallel Website, sponsored
> by Intel and developed in partnership with Slashdot Media, is your hub for all
> things parallel software development, from weekly thought leadership blogs to
> news, videos, case studies, tutorials and more. Take a look and join the
> conversation now.
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things parallel software development, from weekly thought leadership blogs to
news, videos, case studies, tutorials and more. Take a look and join the
conversation now. http://goparallel.sourceforge.net/
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