Examples of com.hp.hpl.jena.query.QueryExecution

com.hp.hpl.jena.query.QueryExecution
A interface for a single execution of a query.

    catch ( RuntimeException ex ) {
      log.warn("_addProps: entityUri=[" +entityUri+ "] queryStr=[" +queryStr+ "]", ex);
      throw ex;
    }
    
    QueryExecution qe = QueryExecutionFactory.create(query, ontModel);
    
    ResultSet results = qe.execSelect();
    
    while ( results.hasNext() ) {
      QuerySolution sol = results.nextSolution();
      Iterator<?> varNames = sol.varNames();

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    if ( mappings == null ) {
      mappings = new ArrayList<Mapping>();
    }
    
    Query query = QueryFactory.create(SKOS_QUERY);
    QueryExecution qe = QueryExecutionFactory.create(query, ontModel);
    
    ResultSet results = qe.execSelect();
    
    while ( results.hasNext() ) {
      
      QuerySolution sol = results.nextSolution();

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        try {
            String queryStr = "select distinct ?Concept where {[] a ?Concept} LIMIT 10";
            Query query = QueryFactory.create(queryStr);


            // Remote execution.
            QueryExecution qexec = QueryExecutionFactory.sparqlService("http://dbpedia.org/sparql", query);
            // Set the DBpedia specific timeout.
            ((QueryEngineHTTP)qexec).addParam("timeout", "10000") ;


            // Execute.
            ResultSet rs = qexec.execSelect();
            ResultSetFormatter.out(System.out, rs, query);
            qexec.close();
        } catch (Exception e) {
            e.printStackTrace();
        }

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            Dataset dataset = setUpDataset(query, testItem) ;
            if ( dataset == null && ! doesQueryHaveDataset(query) ) 
                fail("No dataset for query") ;


            QueryExecution qe = null ;
            
            if ( dataset == null )
                qe = QueryExecutionFactory.create(query, queryFileManager) ;
            else
                qe = QueryExecutionFactory.create(query, dataset) ;
            
            try {
                if ( query.isSelectType() )
                    runTestSelect(query, qe) ;
                else if ( query.isConstructType() )
                    runTestConstruct(query, qe) ;
                else if ( query.isDescribeType() )
                    runTestDescribe(query, qe) ;
                else if ( query.isAskType() )
                    runTestAsk(query, qe) ;
            } finally { qe.close() ; }
        }
        catch (IOException ioEx)
        {
            //log.debug("IOException: ",ioEx) ;
            fail("IOException: "+ioEx.getMessage()) ;

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    {
        Query query = QueryFactory.create(prefixes+string) ;
        QuerySolutionMap initValues = null ;
        if ( varName != null )
            initValues = querySolution(varName, value) ;
        QueryExecution qExec = QueryExecutionFactory.create(query, m, initValues) ;
        ResultSet rs = ResultSetFactory.copyResults(qExec.execSelect()) ;
        qExec.close() ;
        return rs ;
    }

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    }


    protected SPARQLResult executeQuery(HttpActionQuery action, Query query, String queryStringLog)
    {
        Dataset dataset = decideDataset(action, query, queryStringLog) ; 
        QueryExecution qexec = createQueryExecution(query, dataset) ;
        setAnyTimeouts(qexec, action);


        if ( query.isSelectType() )
        {
            ResultSet rs = qexec.execSelect() ;
            
            // Force some query execution now.
            // Do this to force the query to do something that should touch any underlying database,
            // and hence ensure the communications layer is working.
            // MySQL can time out after 8 hours of an idle connection
            rs.hasNext() ;


//            // Not necessary if we are inside a read lock until the end of sending results. 
//            rs = ResultSetFactory.copyResults(rs) ;


            log.info(format("[%d] OK/select", action.id)) ;
            return new SPARQLResult(rs) ;
        }


        if ( query.isConstructType() )
        {
            Model model = qexec.execConstruct() ;
            log.info(format("[%d] OK/construct", action.id)) ;
            return new SPARQLResult(model) ;
        }


        if ( query.isDescribeType() )
        {
            Model model = qexec.execDescribe() ;
            log.info(format("[%d] OK/describe",action.id)) ;
            return new SPARQLResult(model) ;
        }


        if ( query.isAskType() )
        {
            boolean b = qexec.execAsk() ;
            log.info(format("[%d] OK/ask",action.id)) ;
            return new SPARQLResult(b) ;
        }


        errorBadRequest("Unknown query type - "+queryStringLog) ;

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  }


  @Override
  public long evaluateQuery() throws Exception {
    final Date a = new Date();
    final QueryExecution qe = QueryExecutionFactory.create(query, model);
    if (query.isAskType()) {
      qe.execAsk();
    } else if (query.isSelectType()) {
      final ResultSet results = qe.execSelect();
      ResultSetFormatter.consume(results);
    }
    qe.close();
    return ((new Date()).getTime() - a.getTime());
  }

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    return ((new Date()).getTime() - a.getTime());
  }


  @Override
  public QueryResult getResult() throws Exception {
    final QueryExecution qe = QueryExecutionFactory.create(query, model);
    if (query.isAskType()) {
      if (qe.execAsk()) {
        // unempty => true
        final QueryResult qr = new BooleanResult();
        qr.add(new BindingsCollection());
        return qr;
      } else {
        final QueryResult qr = new BooleanResult();
        qe.close();
        return qr;
      }
    } else if (query.isSelectType()) {
      final ResultSet results = qe.execSelect();
      final QueryResult list = resultSetToBindingsList(results);
      qe.close();
      return list;
    } else if (query.isConstructType()) {
      final Model model = qe.execConstruct();
      qe.close();
      final GraphResult gr = new GraphResult();
      TurtleParser.triplesFromModel(model,
          new TripleConsumer() {
            public void consume(final Triple triple) {
              gr.addGraphResultTriple(triple);
            }
          }, TurtleParser.readFileNumber++);
      return gr;
    } else if (query.isDescribeType()) {
      final Model model = qe.execDescribe();
      qe.close();
      final GraphResult gr = new GraphResult();
      TurtleParser.triplesFromModel(model,
          new TripleConsumer() {
            public void consume(final Triple triple) {
              gr.addGraphResultTriple(triple);
            }
          }, TurtleParser.readFileNumber++);
      return gr;
    } else {
      System.out
          .println("Query type currently not supported by JenaQueryEvaluator!");
      qe.close();
      return null;
    }
  }

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  @Override
  public ClosableIterable<Statement> sparqlDescribe(String queryString)
          throws ModelRuntimeException {
    assertModel();
    Query query = QueryFactory.create(queryString);
    QueryExecution qexec = QueryExecutionFactory.create(query, this.jenaModel);
    
    if(query.isDescribeType()) {
      com.hp.hpl.jena.rdf.model.Model m = qexec.execDescribe();
      Model resultModel = new ModelImplJena(null, m, Reasoning.none);
      resultModel.open();
      return resultModel;
    } else {
      throw new RuntimeException("Cannot handle this type of queries! Please use DESCRIBE.");

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      // delegate to super
      return super.queryConstruct(queryString, querylanguage);
    }
    Query query = QueryFactory.create(queryString, syntax);
    
    QueryExecution qexec = QueryExecutionFactory.create(query, this.jenaModel);
    
    if(query.isConstructType()) {
      com.hp.hpl.jena.rdf.model.Model m = qexec.execConstruct();
      Model resultModel = new ModelImplJena(null, m, Reasoning.none);
      resultModel.open();
      return resultModel;
    } else {
      throw new RuntimeException("Cannot handle this type of queries! Please use CONSTRUCT.");

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