针对Jena数据集的默认图形的SPARQL查询

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?

Answer 1

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