[image: 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 <a...@apache.org> 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 <
>> buehm...@informatik.uni-leipzig.de> 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
>>>>>
>>>>> "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
>>>>
>>>>
>>>
>>>
>>
