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  • %META:TOPICPARENT{name="VirtJenaProvider"}% %VOSWARNING% ---+ Virtuoso Jena Provider - SPARQL Example 2 <verbatim> import com.hp.hpl.jena.query.*; import com.hp.hpl.jena.rdf.model.RDFNode; import virtuoso.jena.driver.*; public class VirtuosoSPARQLExample2 { /** * Executes a SPARQL query against a virtuoso url and prints results. */ public static void main(String[] args) { String url; if(args.length == 0) url = "jdbc:virtuoso://localhost:1111"; else url = args[0]; /* STEP 1 */ VirtGraph graph = new VirtGraph ("Example2", url, "dba", "dba"); /* STEP 2 */ /* Load data to Virtuoso */ graph.clear (); System.out.print ("Begin read from 'http://www.w3.org/People/Berners-Lee/card#i' "); graph.read("http://www.w3.org/People/Berners-Lee/card#i", "RDF/XML"); System.out.println ("\t\t\t Done."); System.out.print ("Begin read from 'http://demo.openlinksw.com/dataspace/person/demo#this' "); graph.read("http://demo.openlinksw.com/dataspace/person/demo#this", "RDF/XML"); System.out.println ("\t Done."); System.out.print ("Begin read from 'http://kidehen.idehen.net/dataspace/person/kidehen#this' "); graph.read("http://kidehen.idehen.net/dataspace/person/kidehen#this", "RDF/XML"); System.out.println ("\t Done."); /* STEP 3 */ /* Select only from VirtGraph */ Query sparql = QueryFactory.create("SELECT ?s ?p ?o WHERE { ?s ?p ?o }"); /* STEP 4 */ VirtuosoQueryExecution vqe = VirtuosoQueryExecutionFactory.create (sparql, graph); ResultSet results = vqe.execSelect(); while (results.hasNext()) { QuerySolution result = results.nextSolution(); RDFNode graph_name = result.get("graph"); RDFNode s = result.get("s"); RDFNode p = result.get("p"); RDFNode o = result.get("o"); System.out.println(graph_name + " { " + s + " " + p + " " + o + " . }"); } System.out.println("graph.getCount() = " + graph.getCount()); } } </verbatim>
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  • 2014-04-29T00:31:35Z
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  • VirtJenaSPARQLExample2
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  • 2010-02-01T14:48:54Z
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