| content
| - %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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