Inline images are not allowed here, thus we can't see anything. And a screenshot of Protege is not really helpful.
Prefixes might be wrong. We neither know the final query, nor your code. Please show a sample of the data in best case in Turtle format. And the final query - please not again as Java concatenated String but as the output from System.out.println(query2) On 09.01.2017 15:06, javed khan wrote: > Inline image 1 > > > It shows the result in Protege: Mac is student name and 6 is highscore > of English category scored by him. > > On Mon, Jan 9, 2017 at 4:34 PM, Andy Seaborne <[email protected] > <mailto:[email protected]>> wrote: > > Maybe there are no results. > > This is not a complete, minimal example. Unseen details probably > matter. > > Andy > > > On 09/01/17 13:28, javed khan wrote: > > Hello Lorenz, yes I need student and highscore. > > I just tried this , no exception but it does not display the > message in > JOptionPane.showMessageDialog() > > Query query2 = QueryFactory.create(queryString2); > QueryExecution qexec = QueryExecutionFactory.create(query2, > model) ; > ResultSet results2 = qexec.execSelect() ; > > RDFNode r; > while(results2.hasNext()){ > > QuerySolution sol= results2.nextSolution(); > r=sol.get("student"); > JOptionPane.showMessageDialog(null,"high score is" + r ); > } > > On Mon, Jan 9, 2017 at 1:42 PM, Lorenz Buehmann < > [email protected] > <mailto:[email protected]>> wrote: > > @ As per the previous discussion, I guess he also wants to > have the > student - and of course the highest score, > > As Chris said, you have to distinguish between literals > and URIs/blank > nodes. > > Which finally leads me to the suggestion to read an RDF > tutorial + > SPARQL tutorial first. Most questions are really basic. > > > On 09.01.2017 09:38, Chris Dollin wrote: > > > > On 08/01/17 18:32, javed khan wrote: > > This query gives me exception: > > Exception in thread "AWT-EventQueue-0" > com.hp.hpl.jena.rdf.model.LiteralRequiredException: > http://www.semanticweb.org/t/ontologies#Smith > <http://www.semanticweb.org/t/ontologies#Smith> > > "SELECT * " + > > " WHERE {" + " {"+ "select > (max(?score) as > ?highScore)" > + " { ?student std:Englishscore ?score" + > " }" + > " } " + > "?student std:Englishscore ?highScore" + > > "}"; > > > The variable ?subject will be the subject of a triple. > Subjects may be blank nodes or resources with URIs. > > Query query2 = > QueryFactory.create(queryString2); > QueryExecution qexec = > QueryExecutionFactory.create(query2, model) ; > ResultSet results2 = qexec.execSelect() ; > > Literal > l2=results2.next().get("student").asLiteral(); > > > get("student") will return the value of "student", > which will > be a resource or blank node, but NOT a literal. asLiteral > expects a Literal. > > BOOM. > > My pre-caffeine guess is that you want "highscore" not > "student". > As others have said, offer complete minimal examples. > > Chris > > > > >
