| Attributes | Values |
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| type
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| Date Created
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| Date Modified
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| label
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| maker
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| Title
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| isDescribedUsing
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| has creator
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| content
| - %META:TOPICPARENT{name="VirtJenaProvider"}%
%VOSWARNING%
---+ Virtuoso Jena Provider - SPARQL Example 9
<verbatim>
import com.hp.hpl.jena.query.*;
import com.hp.hpl.jena.rdf.model.RDFNode;
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.rdf.model.*;
import java.util.Iterator;
import virtuoso.jena.driver.*;
public class VirtuosoSPARQLExample9 {
/**
* 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 */
String str = "CLEAR GRAPH <http://test1>";
VirtuosoUpdateRequest vur = VirtuosoUpdateFactory.create(str, set);
vur.exec();
str = "INSERT INTO GRAPH <http://test1> { <http://aa> <http://bb> 'cc' . <http://aa1> <http://bb> 123. }";
vur = VirtuosoUpdateFactory.create(str, set);
vur.exec();
/* Select all data in virtuoso */
Query sparql = QueryFactory.create("SELECT * FROM <http://test1> WHERE { ?s ?p ?o }");
VirtuosoQueryExecution vqe = VirtuosoQueryExecutionFactory.create (sparql, set);
ResultSet results = vqe.execSelect();
System.out.println("\nSELECT results:");
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 + " . }");
}
sparql = QueryFactory.create("DESCRIBE <http://aa> FROM <http://test1>");
vqe = VirtuosoQueryExecutionFactory.create (sparql, set);
Model model = vqe.execDescribe();
Graph g = model.getGraph();
System.out.println("\nDESCRIBE results:");
for (Iterator i = g.find(Node.ANY, Node.ANY, Node.ANY); i.hasNext();)
{
Triple t = (Triple)i.next();
System.out.println(" { " + t.getSubject() + " " +
t.getPredicate() + " " +
t.getObject() + " . }");
}
sparql = QueryFactory.create("CONSTRUCT { ?x <http://test> ?y } FROM <http://test1> WHERE { ?x <http://bb> ?y }");
vqe = VirtuosoQueryExecutionFactory.create (sparql, set);
model = vqe.execConstruct();
g = model.getGraph();
System.out.println("\nCONSTRUCT results:");
for (Iterator i = g.find(Node.ANY, Node.ANY, Node.ANY); i.hasNext();)
{
Triple t = (Triple)i.next();
System.out.println(" { " + t.getSubject() + " " +
t.getPredicate() + " " +
t.getObject() + " . }");
}
sparql = QueryFactory.create("ASK FROM <http://test1> WHERE { <http://aa> <http://bb> ?y }");
vqe = VirtuosoQueryExecutionFactory.create (sparql, set);
boolean res = vqe.execAsk();
System.out.println("\nASK results: "+res);
}
}
</verbatim>
|
| id
| - 5fa4cbb40dfe90d693450694bd4460f2
|
| link
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| has container
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| http://rdfs.org/si...ices#has_services
| |
| atom:title
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| atom:source
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| atom:author
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| atom:published
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| atom:updated
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| topic
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| is made
of | |
| is container of
of | |
| is link
of | |
| is http://rdfs.org/si...vices#services_of
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| is links to
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| is atom:entry
of | |
| is atom:contains
of | |
![[RDF Data]](/fct/images/sw-rdf-blue.png)
![[cxml]](/fct/images/cxml_doc.png)
![[csv]](/fct/images/csv_doc.png)
![[text]](/fct/images/ntriples_doc.png)
![[turtle]](/fct/images/n3turtle_doc.png)
![[ld+json]](/fct/images/jsonld_doc.png)
![[rdf+json]](/fct/images/json_doc.png)
![[rdf+xml]](/fct/images/xml_doc.png)
![[atom+xml]](/fct/images/atom_doc.png)
![[html]](/fct/images/html_doc.png)