Package com.hp.hpl.jena.query

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

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            StageGenerator stageGenAlt = new StageGeneratorAlt(origStageGen) ;
            ARQ.getContext().set(ARQ.stageGenerator, stageGenAlt) ;
        }
       
        Query query = QueryFactory.create( StrUtils.strjoin("\n", queryString)) ;
        QueryExecution engine = QueryExecutionFactory.create(query, makeData()) ;
       
        // ... or set on a per-execution basis.
        if ( true )
        {
            StageGenerator origStageGen = (StageGenerator)engine.getContext().get(ARQ.stageGenerator) ;
            StageGenerator stageGenAlt = new StageGeneratorAlt(origStageGen) ;
            engine.getContext().set(ARQ.stageGenerator, stageGenAlt) ;
        }
       
        QueryExecUtils.executeQuery(query, engine) ;
    }
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        // Force setup
        {
            getStore() ;
            getModStore().getDataset() ;
            Query query = modQuery.getQuery() ;
            QueryExecution qExec = QueryExecutionFactory.create(query, getModStore().getDataset()) ;
            // Don't execute
            qExec.abort();
        }
       
        if ( getModTime().timingEnabled() )
        {
            // Setup costs : flush classes into memory and establish connection
            getModTime().startTimer() ;
            long connectTime =  getModTime().endTimer() ;
            //System.out.println("Connect time:    "+timeStr(connectTime)) ;
           
            getModTime().startTimer() ;
            Query query = modQuery.getQuery() ;
            long javaTime = getModTime().endTimer() ;
           
            if ( isVerbose() )
                System.out.println("Class load time: "+getModTime().timeStr(javaTime)) ;
        }
       
       
        long totalTime = 0 ;
        try {
            getModTime().startTimer() ;
            for ( int i = 0 ; i < repeatCount ; i++ )
            {
//                if ( i == 2 )
//                {
//                    // Reset timer to forget classloading overhead
//                    getModTime().endTimer() ;
//                    getModTime().startTimer() ;
//                }
                   
                Query query = modQuery.getQuery() ;
                QueryExecution qExec = QueryExecutionFactory.create(query, getModStore().getDataset()) ;
               
                if ( isVerbose() )
                    PrintSDB.print(((QueryExecutionBase)qExec).getPlan().getOp()) ;
               
                if ( false )
                    System.err.println("Execute query for loop "+(i+1)+" "+memStr()) ;
                QueryExecUtils.executeQuery(query, qExec, modResults.getResultsFormat()) ;
                qExec.close() ;
            }
            long queryTime = getModTime().endTimer() ;
            totalTime = queryTime ;
        } catch (QueryException ex)
        {
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        // Potentially expensive query.
        String sparqlQueryString = "SELECT (count(*) AS ?count) { ?s ?p ?o }" ;
        // 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) ;
          }
        } finally { qexec.close() ; }

        // Close the dataset.
        dataset.close();
       
    }
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        System.out.println() ;
       
        // Create a single execution of this query, apply to a model
        // which is wrapped up as a Dataset
       
        QueryExecution qexec = QueryExecutionFactory.create(query, model) ;
        // Or QueryExecutionFactory.create(queryString, model) ;

        try {
            // 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
        {
            // QueryExecution objects should be closed to free any system resources
            qexec.close() ;
        }
    }
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        // Prefix mapping just helps serialization
        query.getPrefixMapping().setNsPrefix("dc" , DC.getURI()) ;
        query.serialize(new IndentedWriter(System.out,true)) ;
        System.out.println() ;
       
        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() ; )
            {
                QuerySolution rb = rs.nextSolution() ;
               
                // Get title - variable names do not include the '?' (or '$')
                RDFNode x = rb.get("title") ;
               
                // Check the type of the result value
                if ( x instanceof Literal )
                {
                    Literal titleStr = (Literal)x  ;
                    System.out.println("    "+titleStr) ;
                }
                else
                    System.out.println("Strange - not a literal: "+x) ;
                   
            }
        }
        finally
        {
            // QueryExecution objects should be closed to free any system resources
            qexec.close() ;
        }
    }
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        System.out.println() ;
       
        // Create a single execution of this query, apply to a model
        // which is wrapped up as a Dataset
       
        QueryExecution qexec = QueryExecutionFactory.create(query, model) ;
        // Or QueryExecutionFactory.create(queryString, model) ;

        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() ;
               
                // Get title - variable names do not include the '?' (or '$')
                RDFNode x = rb.get("title") ;
               
                // Check the type of the result value
                if ( x.isLiteral() )
                {
                    Literal titleStr = (Literal)x  ;
                    System.out.println("    "+titleStr) ;
                }
                else
                    System.out.println("Strange - not a literal: "+x) ;
                   
            }
        }
        finally
        {
            // QueryExecution objects should be closed to free any system resources
            qexec.close() ;
        }
    }
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        String prologue = "PREFIX ext: <java:arq.examples.propertyfunction.>\n" ;

        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) ;
        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() ; }
    }
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        Query q = QueryFactory.create(s) ;
        QuerySolutionMap qsm = new QuerySolutionMap() ;
        qsm.add("ATYPE", atype) ;

        QueryExecution qExec = QueryExecutionFactory.create(q, model, qsm);
        Resource r = (Resource)QueryExecUtils.getOne(qExec, "root") ;
        return r;
    }
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    {
        Query q = QueryFactory.create(qs) ;
        if ( q.getResultVars().size() != 1 )
            throw new ARQException("getExactlyOne: Must have exactly one result columns") ;
        String varname = q.getResultVars().get(0) ;
        QueryExecution qExec = QueryExecutionFactory.create(q, ds);
        return getExactlyOne(qExec, varname) ;
    }
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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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Related Classes of com.hp.hpl.jena.query.QueryExecution

  • arq.examples.bgpmatching.StageAltMain
  • arq.examples.Ex1
  • arq.examples.Ex2
  • arq.examples.ExampleDBpedia
  • arq.examples.ExProg1
  • arq.examples.ExProg2
  • arq.examples.ExQuerySelect1
  • arq.examples.ExQuerySelect2
  • arq.examples.larq.ExLucene1
  • arq.examples.propertyfunction.labelSearch
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