VirtJenaSPARQLExample8import org.apache.jena.query.*; import org.apache.jena.rdf.model.RDFNode; import virtuoso.jena.driver.*; public class VirtuosoSPARQLExample8 { /** * 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 set = new VirtGraph (url, "dba", "dba"); /* STEP 2 */ System.out.println("\nexecute: CLEAR GRAPH <http://test1>"); String str = "CLEAR GRAPH <http://test1>"; VirtuosoUpdateRequest vur = VirtuosoUpdateFactory.create(str, set); vur.exec(); System.out.println("\nexecute: INSERT INTO GRAPH <http://test1> { <aa> <bb> 'cc' . <aa1> <bb1> 123. }"); str = "INSERT INTO GRAPH <http://test1> { <aa> <bb> 'cc' . <aa1> <bb1> 123. }"; vur = VirtuosoUpdateFactory.create(str, set); vur.exec(); /* STEP 3 */ /* Select all data in virtuoso */ System.out.println("\nexecute: SELECT * FROM <http://test1> WHERE { ?s ?p ?o }"); Query sparql = QueryFactory.create("SELECT * FROM <http://test1> WHERE { ?s ?p ?o }"); /* STEP 4 */ QueryExecution vqe = VirtuosoQueryExecutionFactory.create (sparql, set); ResultSet results = vqe.execSelect(); while (results.hasNext()) { QuerySolution rs = results.nextSolution(); RDFNode s = rs.get("s"); RDFNode p = rs.get("p"); RDFNode o = rs.get("o"); System.out.println(" { " + s + " " + p + " " + o + " . }"); } System.out.println("\nexecute: DELETE FROM GRAPH <http://test1> { <aa> <bb> 'cc' }"); str = "DELETE FROM GRAPH <http://test1> { <aa> <bb> 'cc' }"; vur = VirtuosoUpdateFactory.create(str, set); vur.exec(); System.out.println("\nexecute: SELECT * FROM <http://test1> WHERE { ?s ?p ?o }"); vqe = VirtuosoQueryExecutionFactory.create (sparql, set); results = vqe.execSelect(); while (results.hasNext()) { QuerySolution rs = results.nextSolution(); RDFNode s = rs.get("s"); RDFNode p = rs.get("p"); RDFNode o = rs.get("o"); System.out.println(" { " + s + " " + p + " " + o + " . }"); } } }