SPARQL Query against default graph of Jena dataset

Question

In thingweb-repository in file ThingDescriptionCollectionHandler.java on line 173:

tdb = dataset.getDefaultModel();
tdb.createResource(resourceUri.toString()).addProperty(DC.source, data);

Question: I am trying to write a SPARQL query to run against the default graph of a dataset to check if the data is present and return that data resourceUri from the graph.

I tried to follow different tutorials of writing a SPARQL query but did not succeed so far. Any suggestion how to write a query against dataset default graph and which parameters are there in Jena RDF Dataset that can be queried?

It's not clear which query you tried and how. Basically, if you do not specify a graph, the default graph will be used. That means, it should work with any dataset resp. model — UninformedUser

chrisis chrisis · Accepted Answer · 2017-03-06T18:00:41

I think you want something like:

SELECT ?s ?p ?o
WHERE {GRAPH <urn:x-arq:DefaultGraph> { ?s ?p ?o.} }

You should take a look at this part of the docs. Jena special graph names

SPARQL Query against default graph of Jena dataset

1 Answers