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

            "   ?Meal rdf:type food:MealCourse .\r\n" + 
            "   ?Meal food:hasDrink ?Wine .\r\n" + 
            "   ?Wine wine:hasColor ?WineColor" +
            queryEnd;


        Query query1 = QueryFactory.create( queryStr1 );
        Query query2 = QueryFactory.create( queryStr2 );


        // The following definitions from food ontology dictates that 
        // PastaWithLightCreamCourse has white wine and RedMeatCourse 
        // has red wine.
        //  Class(PastaWithLightCreamCourse partial

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      // Then read the data from the file into the ontology model
      m.read( ontology );
  
      // Now read the query file into a query object
      Query q = QueryFactory.read( query );
  
      // Create a SPARQL-DL query execution for the given query and
      // ontology model
      QueryExecution qe = SparqlDLExecutionFactory.create( q, m );
  
      // We want to execute a SELECT query, do it, and return the result set
      ResultSet rs = qe.execSelect();
  
      // Print the query for better understanding
      System.out.println(q.toString());
      
      // There are different things we can do with the result set, for
      // instance iterate over it and process the query solutions or, what we
      // do here, just print out the results
      ResultSetFormatter.out( rs );

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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()) ;

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    }


    @Override
    protected void execCmd(List<String> positionalArgs)
    {
        Query query = modQuery.getQuery() ;
        compilePrint(getStore(), query) ;
    }

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    public static QuerySolution[] executeSimpleSparql(Model model, String queryStr) {
        LinkedList results = new LinkedList();        
        model.enterCriticalSection(Lock.READ) ;//Concurrency protect, it is  absolutely not neccesary but is recommended
        try{
            Query query = QueryFactory.create(queryStr) ;
            QueryExecution qexec = null;
            try {
                qexec = QueryExecutionFactory.create(query, model) ;
                
                ResultSet resultsSet = qexec.execSelect();

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        return (subject+(" ")+predicate+(" ")+object);
    }
    
    
    public static boolean runQuestion(Model model,String queryString) {
        Query query = QueryFactory.create(queryString) ;
        QueryExecution qe = QueryExecutionFactory.create(query, model);        
        return qe.execAsk();
    }

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    public static void main(String[] args)
    {
        Model model = createModel() ;
        
        Query query = QueryFactory.make() ;


        query.setQuerySelectType() ;
        
        // Build pattern
        
        ElementGroup elg = new ElementGroup() ;
        
        Var varTitle = Var.alloc("title") ;
        Var varX = Var.alloc("x") ;
        
        Triple t1 = new Triple(varX, DC.title.asNode(),  varTitle) ;
        elg.addTriplePattern(t1) ;
        
        // Don't use bNodes for anon variables.  The conversion is done in parsing.
        // BNodes here are assumed to be values from the target graph.
        Triple t2 = new Triple(varX, DC.description.asNode(), Var.alloc("desc")) ;
        elg.addTriplePattern(t2) ;
        
        // Attach the group to query.  
        query.setQueryPattern(elg) ;


        // Choose what we want - SELECT *
        //query.setQueryResultStar(true) ;
        query.addResultVar(varTitle) ;
        
        // Print query with line numbers
        // 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 {

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            StageGenerator origStageGen = (StageGenerator)ARQ.getContext().get(ARQ.stageGenerator) ;
            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 )
        {

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        return query ;
    }
    
    public static Element parseElement(String string)
    {
        final Query query = new Query () ;
        Action action = new Action() {
            @Override
            public void exec(SPARQLParser10 parser) throws Exception
            {
                Element el = parser.GroupGraphPattern() ;
                query.setQueryPattern(el) ;
            }
        } ;
        perform(query, string, action) ;
        return query.getQueryPattern() ;
    }

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        return query.getQueryPattern() ;
    }
    
    public static Template parseTemplate(String string)
    {
        final Query query = new Query () ;
        Action action = new Action() {
            @Override
            public void exec(SPARQLParser10 parser) throws Exception
            {
                Template t = parser.ConstructTemplate() ;
                query.setConstructTemplate(t) ;
            }
        } ;
        perform(query, string, action) ;
        return query.getConstructTemplate() ;
    }

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