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

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

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

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//    protected UpdateSink getUpdateSink() { return sink ; }
    public void setUpdateSink(UpdateSink sink)
    { 
        this.sink = sink ;
        this.query = new Query() ; 
        setPrologue(sink.getPrologue()) ;
    }

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    protected void startSubSelect(int line, int col)
    {
        if ( query == null )
            throw new ARQInternalErrorException("Parser query object is null") ;
        stack.push(query) ;
        query = new Query(getPrologue()) ;
    }

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        query = new Query(getPrologue()) ;
    }
    
    protected Query endSubSelect(int line, int column)
    {
        Query subQuery = query ;
        if ( ! subQuery.isSelectType() )
            throwParseException("Subquery not a SELECT query", line, column) ;
        query = stack.pop();
        return subQuery ;
    }

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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() ; )
          {

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        // Query string.
        String queryString = prolog + NL +
            "SELECT ?title WHERE {?x dc:title ?title}" ; 
        
        Query query = QueryFactory.create(queryString) ;
        // Print with line numbers
        query.serialize(new IndentedWriter(System.out,true)) ;
        System.out.println() ;
        
        // Create a single execution of this query, apply to a model
        // which is wrapped up as a Dataset

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    public static void main(String[] args)
    {
        Model model = createModel() ;
        
        Query query = QueryFactory.make() ;
        query.setQuerySelectType() ;
        
        // See also ExProg1
        
        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) ;
        
        // Adds a filter.  Need to wrap variable in a NodeVar.
        Expr expr = new E_Regex(new ExprVar(varTitle), "sparql", "i") ;
        ElementFilter filter = new  ElementFilter(expr) ;
        elg.addElementFilter(filter) ;
        
        // Attach the group to query.  
        query.setQueryPattern(elg) ;
        
        // Choose what we want - SELECT ?title
        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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