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

        
        // 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)
    {
        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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    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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        // 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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    static void performQuery(Model model, IndexLARQ index, String queryString)
    {  
        // Make globally available
        LARQ.setDefaultIndex(index) ;
        
        Query query = QueryFactory.create(queryString) ;
        query.serialize(System.out) ;
        System.out.println();
                                          
        QueryExecution qExec = QueryExecutionFactory.create(query, model) ;
        //LARQ.setDefaultIndex(qExec.getContext(), index) ;
        ResultSetFormatter.out(System.out, qExec.execSelect(), query) ;

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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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    {
        // Call the function as java:arq.examples.ext.labelSearch or register it.
        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) ;

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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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          "xslt-uri");


      log.info("Query is:\n" + theQuery);
      log.info("Stylesheet: " + stylesheet);


      Query query = QueryFactory.create(theQuery);


      if (type == LDAP)
        qe = new LdapQueryEngine(query, config);
      else
        qe = new SQLQueryEngine(query, config);

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  }
  
  public QueryEngine prepareQuery(String queryS) throws SQLException, ConfigException
  {
    Model config = ExtractConfig.process("jdbc:hsqldb:mem:test", "org.hsqldb.jdbcDriver", "urn:ex:", "sa", "", new String[]{"TABLE1", "TABLE2"}, conn.getMetaData());
    Query query = QueryFactory.create(queryS);
    QueryEngine qe = new SQLQueryEngine(query, config);
    qe.setDataset(DatasetFactory.create());
    return qe;
  }

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Related Classes of com.hp.hpl.jena.query.Query

arq.examples.AlgebraEx

arq.examples.bgpmatching.StageAltMain

arq.examples.propertyfunction.labelSearch

arq.qparse

arq.rsparql

at.tuwien.minireef.MiniREEF

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