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

    }
    
    @Override
    protected void exec()
    {
        Query query = modQuery.getQuery() ;


        try {
            String serviceURL = modRemote.getServiceURL() ;
            QueryExecution qe = QueryExecutionFactory.sparqlService(serviceURL, query) ;
            if ( modRemote.usePost() )

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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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    }


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

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    public static void main(String []args)
    {
        String s = "SELECT DISTINCT ?s { ?s ?p ?o }";
        
        // Parse
        Query query = QueryFactory.create(s) ;
        System.out.println(query) ;
        
        // Generate algebra
        Op op = Algebra.compile(query) ;
        op = Algebra.optimize(op) ;

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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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    @Override
    protected void exec()
    {
        try{
            Query query = modQuery.getQuery() ;
            try {
                QueryUtils.checkQuery(query, true) ;
            } catch (QueryCheckException ex)
            {
                System.err.println() ;

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            }
        }


        // Explain.explain("HTTP", opRemote, context) ;


        Query query;


        //@formatter:off
        // Comment (for the future?)
//        if ( false )
//        {

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    @Override
    public void visit(UpdateModify update)
    {
        Node withGraph = update.getWithIRI() ;
        Query query = elementToQuery(update.getWherePattern()) ;
        
        // USING/USING NAMED
        DatasetGraph dsg = processUsing(update) ;
        
        // USING overrides WITH

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    protected Query elementToQuery(Element pattern)
    {
        if ( pattern == null )
            return null ;
        Query query = new Query() ;
        query.setQueryPattern(pattern) ;
        query.setQuerySelectType() ;
        query.setQueryResultStar(true) ;
        query.setResultVars() ;
        return query ;
    }

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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
      // Important: specifying that the query is in Terp syntax
      Query q = QueryFactory.read( query, TerpSyntax.getInstance() );
  
      // Create a SPARQL-DL query execution for the given query and
      // ontology model
      QueryExecution qe = SparqlDLExecutionFactory.create( q, m );

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