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2017-06-13T05:41:22.111411

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2017-06-29T07:38:24.478693

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%VOSWARNING% %META:TOPICPARENT{name="VirtJenaProvider"}% ---+ Virtuoso Jena Provider - SPARQL Example 13 <verbatim> import com.hp.hpl.jena.query.*; import com.hp.hpl.jena.graph.Triple; import com.hp.hpl.jena.graph.Node; import com.hp.hpl.jena.graph.Graph; import com.hp.hpl.jena.graph.test.*; import com.hp.hpl.jena.rdf.model.*; import com.hp.hpl.jena.rdf.model.RDFNode; import com.hp.hpl.jena.vocabulary.RDFS; import java.util.*; import virtuoso.jena.driver.*; public class VirtuosoSPARQLExample13 { /** * 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]; /*** LOADING data to http://exmpl13 graph ***/ VirtModel mdata = VirtModel.openDatabaseModel("http://exmpl13", url, "dba", "dba"); mdata.removeAll(); Statement st; st = statement(mdata, "http://localhost:8890/dataspace http://www.w3.org/1999/02/22-rdf-syntax-ns#type http://rdfs.org/sioc/ns#Space" ); mdata.add(st); st = statement(mdata, "http://localhost:8890/dataspace http://rdfs.org/sioc/ns#link http://localhost:8890/ods"); mdata.add(st); st = statement(mdata, "http://localhost:8890/dataspace/test2/weblog/test2tWeblog http://www.w3.org/1999/02/22-rdf-syntax-ns#type http://rdfs.org/sioc/types#Weblog"); mdata.add(st); st = statement(mdata, "http://localhost:8890/dataspace/test2/weblog/test2tWeblog http://rdfs.org/sioc/ns#link http://localhost:8890/dataspace/test2/weblog/test2tWeblog"); mdata.add(st); st = statement(mdata, "http://localhost:8890/dataspace/discussion/oWiki-test1Wiki http://www.w3.org/1999/02/22-rdf-syntax-ns#type http://rdfs.org/sioc/types#MessageBoard"); mdata.add(st); st = statement(mdata, "http://localhost:8890/dataspace/discussion/oWiki-test1Wiki http://rdfs.org/sioc/ns#link http://localhost:8890/dataspace/discussion/oWiki-test1Wiki"); mdata.add(st); // Query string. String queryString = "SELECT * WHERE {?s ?p ?o}" ; System.out.println("Execute query=\n"+queryString) ; System.out.println() ; QueryExecution qexec = VirtuosoQueryExecutionFactory.create(queryString, mdata) ; try { ResultSet rs = qexec.execSelect() ; for ( ; rs.hasNext() ; ) { QuerySolution result = rs.nextSolution(); RDFNode s = result.get("s"); RDFNode p = result.get("p"); RDFNode o = result.get("o"); System.out.println(" { " + s + " " + p + " " + o + " . }"); } } finally { qexec.close() ; } mdata.removeRuleSet("exmpl13_rules","http://:exmpl13_schema"); /*** LOADING rule to http://exmpl13_schema graph ***/ VirtModel mrule = VirtModel.openDatabaseModel("http://exmpl13_schema", url, "dba", "dba"); mrule.removeAll(); Resource r1 = mrule.createResource("http://rdfs.org/sioc/ns#Space") ; r1.addProperty(RDFS.subClassOf, rdfNode(mrule, "http://www.w3.org/2000/01/rdf-schema#Resource")); r1 = mrule.createResource("http://rdfs.org/sioc/ns#Container") ; r1.addProperty(RDFS.subClassOf, rdfNode(mrule, "http://rdfs.org/sioc/ns#Space")); r1 = mrule.createResource("http://rdfs.org/sioc/ns#Forum") ; r1.addProperty(RDFS.subClassOf, rdfNode(mrule, "http://rdfs.org/sioc/ns#Container")); r1 = mrule.createResource("http://rdfs.org/sioc/types#Weblog") ; r1.addProperty(RDFS.subClassOf, rdfNode(mrule, "http://rdfs.org/sioc/ns#Forum")); r1 = mrule.createResource("http://rdfs.org/sioc/types#MessageBoard") ; r1.addProperty(RDFS.subClassOf, rdfNode(mrule, "http://rdfs.org/sioc/ns#Forum")); r1 = mrule.createResource("http://rdfs.org/sioc/ns#link") ; r1.addProperty(RDFS.subPropertyOf, rdfNode(mrule, "http://rdfs.org/sioc/ns")); mrule.close(); mdata.createRuleSet("exmpl13_rules","http://exmpl13_schema"); mdata.close(); VirtInfGraph infGraph = new VirtInfGraph("exmpl13_rules", false, "http://exmpl13", url, "dba", "dba"); InfModel model = ModelFactory.createInfModel(infGraph); queryString = "SELECT ?s "+ "FROM <http://exmpl13> "+ "WHERE {?s <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://rdfs.org/sioc/ns#Space> } "; System.out.println("\n\nExecute query=\n"+queryString) ; System.out.println() ; qexec = VirtuosoQueryExecutionFactory.create(queryString, model) ; try { ResultSet rs = qexec.execSelect() ; for ( ; rs.hasNext() ; ) { QuerySolution result = rs.nextSolution(); RDFNode s = result.get("s"); System.out.println(" " + s); } } finally { qexec.close() ; } queryString = "SELECT * "+ "FROM <http://exmpl13> "+ "WHERE "+ "{ "+ " ?s ?p <http://rdfs.org/sioc/ns#Space> . "+ " ?s ?p1 <http://localhost:8890/dataspace/test2/weblog/test2tWeblog> . "+ "} "; System.out.println("\n\nExecute query=\n"+queryString) ; System.out.println() ; qexec = VirtuosoQueryExecutionFactory.create(queryString, model) ; try { ResultSet rs = qexec.execSelect() ; for ( ; rs.hasNext() ; ) { QuerySolution result = rs.nextSolution(); RDFNode s = result.get("s"); RDFNode p = result.get("p"); RDFNode p1 = result.get("p1"); System.out.println(" " + s + " " + p + " " + p1); } } finally { qexec.close() ; } model.close(); } public static Statement statement( Model m, String fact ) { StringTokenizer st = new StringTokenizer( fact ); Resource sub = resource( m, st.nextToken() ); Property pred = property( m, st.nextToken() ); RDFNode obj = rdfNode( m, st.nextToken() ); return m.createStatement( sub, pred, obj ); } public static Resource resource( Model m, String s ) { return (Resource) rdfNode( m, s ); } public static Property property( Model m, String s ) { return (Property) rdfNode( m, s ).as( Property.class ); } public static RDFNode rdfNode( Model m, String s ) { return m.asRDFNode( NodeCreateUtils.create( m, s ) ); } } </verbatim>

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2017-06-13T05:41:22Z

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