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  • %META:TOPICPARENT{name="VirtJenaProvider"}% %VOSWARNING% ---+ Virtuoso Jena Provider - SPARQL Example 6 <verbatim> import java.util.*; import com.hp.hpl.jena.query.*; import com.hp.hpl.jena.util.iterator.ExtendedIterator; import com.hp.hpl.jena.graph.Node; import com.hp.hpl.jena.graph.Triple; import virtuoso.jena.driver.*; public class VirtuosoSPARQLExample6 { public static void main(String[] args) { String url; if(args.length == 0) url = "jdbc:virtuoso://localhost:1111"; else url = args[0]; Node foo1 = Node.createURI("http://example.org/#foo1"); Node bar1 = Node.createURI("http://example.org/#bar1"); Node baz1 = Node.createURI("http://example.org/#baz1"); Node foo2 = Node.createURI("http://example.org/#foo2"); Node bar2 = Node.createURI("http://example.org/#bar2"); Node baz2 = Node.createURI("http://example.org/#baz2"); Node foo3 = Node.createURI("http://example.org/#foo3"); Node bar3 = Node.createURI("http://example.org/#bar3"); Node baz3 = Node.createURI("http://example.org/#baz3"); VirtGraph graph = new VirtGraph ("Example6", url, "dba", "dba"); graph.clear (); System.out.println("graph.isEmpty() = " + graph.isEmpty()); System.out.println("test Transaction Commit."); graph.getTransactionHandler().begin(); System.out.println("begin Transaction."); System.out.println("Add 3 triples to graph <Example6>."); graph.add(new Triple(foo1, bar1, baz1)); graph.add(new Triple(foo2, bar2, baz2)); graph.add(new Triple(foo3, bar3, baz3)); graph.getTransactionHandler().commit(); System.out.println("commit Transaction."); System.out.println("graph.isEmpty() = " + graph.isEmpty()); System.out.println("graph.getCount() = " + graph.getCount()); ExtendedIterator iter = graph.find(Node.ANY, Node.ANY, Node.ANY); System.out.println ("\ngraph.find(Node.ANY, Node.ANY, Node.ANY) \nResult:"); for ( ; iter.hasNext() ; ) System.out.println ((Triple) iter.next()); graph.clear (); System.out.println("\nCLEAR graph <Example6>"); System.out.println("graph.isEmpty() = " + graph.isEmpty()); System.out.println("Add 1 triples to graph <Example6>."); graph.add(new Triple(foo1, bar1, baz1)); System.out.println("test Transaction Abort."); graph.getTransactionHandler().begin(); System.out.println("begin Transaction."); System.out.println("Add 2 triples to graph <Example6>."); graph.add(new Triple(foo2, bar2, baz2)); graph.add(new Triple(foo3, bar3, baz3)); graph.getTransactionHandler().abort(); System.out.println("abort Transaction."); System.out.println("graph.isEmpty() = " + graph.isEmpty()); System.out.println("graph.getCount() = " + graph.getCount()); iter = graph.find(Node.ANY, Node.ANY, Node.ANY); System.out.println ("\ngraph.find(Node.ANY, Node.ANY, Node.ANY) \nResult:"); for ( ; iter.hasNext() ; ) System.out.println ((Triple) iter.next()); graph.clear (); System.out.println("\nCLEAR graph <Example6>"); } } </verbatim>
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