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  • VOS.VirtJenaSPARQLExample7(Last) -- DAVWikiAdmin? , 2017-06-13 05:36:29 Edit WebDAV System Administrator 2017-06-13 01:36:29

    Virtuoso Jena Provider - SPARQL Example 7


    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 VirtuosoSPARQLExample7
    {
    
        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");
    
    	List triples1 = new ArrayList();
    	triples1.add(new Triple(foo1, bar1, baz1));
    	triples1.add(new Triple(foo2, bar2, baz2));
    	triples1.add(new Triple(foo3, bar3, baz3));
    
    	List triples2 = new ArrayList();
    	triples2.add(new Triple(foo1, bar1, baz1));
    	triples2.add(new Triple(foo2, bar2, baz2));
    
    	VirtGraph graph = new VirtGraph ("Example7", url, "dba", "dba");
    
    	graph.clear ();
    
    	System.out.println("graph.isEmpty() = " + graph.isEmpty());
    	System.out.println("Add List with 3 triples to graph <Example7> via BulkUpdateHandler.");
    
    	graph.getBulkUpdateHandler().add(triples1);
    
    	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());
    
    
    	System.out.println("\n\nDelete List of 2 triples from graph <Example7> via BulkUpdateHandler.");
    
    	graph.getBulkUpdateHandler().delete(triples2);
    
    	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 <Example7>");
    
        }
    }