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

com.hp.hpl.jena.query.Query
The data structure for a query as presented externally. There are two ways of creating a query - use the parser to turn a string description of the query into the executable form, and the programmatic way (the parser is calling the programmatic operations driven by the quyery string). The declarative approach of passing in a string is preferred. Once a query is built, it can be passed to the QueryFactory to produce a query execution engine. @see QueryExecutionFactory @see ResultSet

        
        // Potentially expensive query.
        String sparqlQueryString = "SELECT (count(*) AS ?count) { ?s ?p ?o }" ;
        // See http://www.openjena.org/ARQ/app_api.html
        
        Query query = QueryFactory.create(sparqlQueryString) ;
        QueryExecution qexec = QueryExecutionFactory.create(query, dataset) ;
        try {
          ResultSet results = qexec.execSelect() ;
          for ( ; results.hasNext() ; )
          {

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        // Potentially expensive query.
        String sparqlQueryString = "SELECT (count(*) AS ?count) { ?s ?p ?o }" ;
        // See http://www.openjena.org/ARQ/app_api.html
        
        Query query = QueryFactory.create(sparqlQueryString) ;
        QueryExecution qexec = QueryExecutionFactory.create(query, dataset) ;
        ResultSet results = qexec.execSelect() ;
        ResultSetFormatter.out(results) ;
        qexec.close() ;

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/** Convert an Op expression in SPARQL syntax, that is, the reverse of algebra generation */   
public class OpAsQuery
{
    public static Query asQuery(Op op)
    {
        Query query = QueryFactory.make() ;
        
        Converter v = new Converter(query) ;
        //OpWalker.walk(op, v) ;
        op.visit(v) ;
        
        List<Var> vars = v.projectVars;
        query.setQueryResultStar(vars.isEmpty()); // SELECT * unless we are projecting
        Iterator<Var> iter = vars.iterator();
        for (; iter.hasNext();) {
            Var var = iter.next();
            if (v.varExpression.containsKey(var))
                query.addResultVar(var, v.varExpression.get(var));
            else
                query.addResultVar(var);
        }
        
        ElementGroup eg = v.currentGroup ;
        query.setQueryPattern(eg) ;
        query.setQuerySelectType() ;
        
        query.setResultVars() ; 
        return query ; 
    }

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        assertEquals("http://theyknow.whatiswhat.com/text<withAngleBrackets>",uri);
    }


    @Test
    public void testQueryParsing() {
        Query q=QueryFactory.create(
                "PREFIX basekb: <http://rdf.basekb.com/ns/> \n" +
                        "\n" +
                        "SELECT * {basekb:en.brad_pitt ?p ?o .}"
                );
        assertTrue(true);

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        assertTrue(true);
    }


    //  @Test
    public void testBinding() {
        Query q=QueryFactory.create(
                "SELECT ?dayName WHERE {"+ 
                        "   FILTER (!bound(?dayIDCheck))"+
                        "}"+
                        "BINDINGS ?dayIDCheck ?dayName {"+
                        "   (0 'Sunday'@en)"+

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    //
    public static void appendConstruct(Model outModel,
            String queryString,
            Model inModel,
            QuerySolution bindings) {
        Query query=QueryFactory.create(queryString);
        QueryExecution qe=QueryExecutionFactory.create(query,inModel);
        try {
            if(null!=bindings) {
                qe.setInitialBinding(bindings);
            }

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   * @throws Exception 
   */
  public static QueryResult executeQuery(Model model, String sparqlQuery, String form) throws Exception {
    QueryExecution qe = null;
    try {
      Query query = QueryFactory.create(sparqlQuery);
      qe = QueryExecutionFactory.create(query, model);
      if ( log.isDebugEnabled() ) {
        log.debug("QueryExecution class: " +qe.getClass().getName());
      }
      return executeQuery(query, qe, sparqlQuery, form);

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      return queryResult;
    }
    
    // use Jena to determine what kind of query this is (AG doesn't seem to provide an operation for this)
    // so we call the appropriate execution method:
    Query query = QueryFactory.create(sparqlQuery);


    // only one of these results is captured
    TriplesIterator tripleIter = null;
    ValueSetIterator valSetIter = null;
    Boolean askResult = null;


    
    queryResult.setContentType("text/plain");


    // SELECT
    if ( query.isSelectType() ) {
      valSetIter = sq.select();
    }
    // DESCRIBE
    else if ( query.isDescribeType() ) {
      tripleIter = sq.describe();
    }
    // CONSTRUCT
    else if ( query.isConstructType() ) {
      tripleIter = sq.construct();
    }
    // ASK
    else if ( query.isAskType() ) {
      askResult = Boolean.valueOf(sq.ask());
    }


    if ( valSetIter != null ) {
      queryResult.setIsEmpty(! valSetIter.hasNext());

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  }


  private QueryResult _executeQuery(_Conn _conn, String sparqlQuery, String form) throws Exception {
    log.debug(" _executeQuery called.");
    
    Query query = QueryFactory.create(sparqlQuery);
    VirtuosoQueryExecution vqe = VirtuosoQueryExecutionFactory.create(query, _conn._graph);
    
    try {
      QueryResult queryResult = Sparql.executeQuery(query, vqe, sparqlQuery, form);
      return queryResult;

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    if ( entities == null ) {
      entities = new ArrayList<IndividualInfo>();
    }
    
    Query query = QueryFactory.create(INDIVIDUALS_QUERY);
    QueryExecution qe = QueryExecutionFactory.create(query, ontModel);
    
    ResultSet results = qe.execSelect();
    
    while ( results.hasNext() ) {

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