Examples of com.hp.hpl.jena.query.QueryExecution.execSelect()

Class com.hp.hpl.jena.query.QueryExecution

Examples of com.hp.hpl.jena.query.QueryExecution.execSelect()

com.hp.hpl.jena.query.QueryExecution.execSelect()
Execute a SELECT query
Important: The name of this method is somewhat of a misnomer in that depending on the underlying implementation this typically does not execute the SELECT query but rather answers a wrapper over an internal data structure that can be used to answer the query. In essence calling this method only returns a plan for executing this query which only gets evaluated when you actually start iterating over the results.

            Query query = QueryFactory.create(queryStr) ;
            QueryExecution qexec = null;
            try {
                qexec = QueryExecutionFactory.create(query, model) ;
                
                ResultSet resultsSet = qexec.execSelect();                
                for ( ; resultsSet.hasNext() ; )
                {
                    QuerySolution soln = resultsSet.nextSolution() ;                    
                    results.add(soln);                  
                }

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          }
        });


    try {
      try {
        return new ResultSetWrapper(qexec.execSelect());
      } catch (QueryExecException e) {
        try {
          return Boolean.valueOf(qexec.execAsk());
        } catch (QueryExecException e2) {
          try {

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        QueryExecution qexec = QueryExecutionFactory.create(query, model) ;
        
        try {
            // Assumption: it's a SELECT query.
            ResultSet rs = qexec.execSelect() ;
            
            // The order of results is undefined.
            System.out.println("Titles: ") ;
            for ( ; rs.hasNext() ; )
            {

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        // See http://incubator.apache.org/jena/documentation/query/app_api.html
        
        Query query = QueryFactory.create(sparqlQueryString) ;
        QueryExecution qexec = QueryExecutionFactory.create(query, dataset) ;
        try {
          ResultSet results = qexec.execSelect() ;
          for ( ; results.hasNext() ; )
          {
              QuerySolution soln = results.nextSolution() ;
              int count = soln.getLiteral("count").getInt() ;
              System.out.println("count = "+count) ;

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            // A ResultSet is an iterator - any query solutions returned by .next()
            // are not accessible again.
            // Create a ResultSetRewindable that can be reset to the beginning.
            // Do before first use.
            
            ResultSetRewindable rewindable = ResultSetFactory.makeRewindable(qexec.execSelect()) ;
            ResultSetFormatter.out(rewindable) ;
            rewindable.reset() ;
            ResultSetFormatter.out(rewindable) ;
        }
        finally

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        QueryExecution qexec = QueryExecutionFactory.create(query, model) ;


        try {
            // Assumption: it's a SELECT query.
            ResultSet rs = qexec.execSelect() ;
            
            // The order of results is undefined.
            System.out.println("Titles: ") ;
            for ( ; rs.hasNext() ; )
            {

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        System.out.println("Titles: ") ;
        
        try {
            // Assumption: it's a SELECT query.
            ResultSet rs = qexec.execSelect() ;
            
            // The order of results is undefined. 
            for ( ; rs.hasNext() ; )
            {
                QuerySolution rb = rs.nextSolution() ;

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        String qs = prologue+"SELECT * { ?x ext:labelSearch 'EF' }" ;
        Query query = QueryFactory.create(qs) ;
        Model model = make() ;
        QueryExecution qExec = QueryExecutionFactory.create(query, model) ;
        try {
            ResultSet rs = qExec.execSelect() ;
            ResultSetFormatter.out(rs) ;
        } finally { qExec.close() ; }
        
        // Or register it.
        PropertyFunctionRegistry.get().put("http://example/f#search", labelSearch.class) ;

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        prologue = "PREFIX ext: <http://example/f#>\n" ;
        qs = prologue+"SELECT * { ?x ext:search 'EF' }" ;
        query = QueryFactory.create(qs) ;
        qExec = QueryExecutionFactory.create(query, model) ;
        try {
            ResultSet rs = qExec.execSelect() ;
            ResultSetFormatter.out(rs) ;
        } finally { qExec.close() ; }
    }
    
    private static Model make()

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    public static Iterator<Node> storeGraphNames(Store store)
    {
        List<Node> x = new ArrayList<Node>() ;
        String qs = "SELECT ?g { GRAPH ?g { }}" ;
        QueryExecution qExec = QueryExecutionFactory.create(qs, SDBFactory.connectDataset(store)) ;
        ResultSet rs = qExec.execSelect() ;
        Var var_g = Var.alloc("g") ;
        while(rs.hasNext())
        {
            Node n = rs.nextBinding().get(var_g) ;
            x.add(n) ;

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