Examples of org.openrdf.sail.SailConnection.evaluate()

org.openrdf.sail.SailConnection.evaluate()
Evaluates the supplied TupleExpr on the data contained in this Sail object, using the (optional) dataset and supplied bindings as input parameters. @param query The query to evaluate. @param bindings A set of input parameters for the query evaluation. The keys reference variable names that should be bound to the value they map to. @param includeInferred Indicates whether inferred triples are to be considered in the query result. If false, no inferred statements are returned; if true, inferred statements are returned if available @return The TupleQueryResult. @throws StoreException If the Sail object encountered an error or unexpected situation internally.

    con.addStatement(foo, RDF.TYPE, bar);


    TupleQueryModel query = QueryParserUtil.parseTupleQuery(QueryLanguage.SERQL,
        "SELECT X, P, Y FROM {X} P {Y}", null);


    Cursor<? extends BindingSet> iter = con.evaluate(query,
        EmptyBindingSet.getInstance(), false);


    BindingSet bindingSet = iter.next();


    assertEquals(bindingSet.getValue("X"), foo);

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    foo = factory.createURI("http://www.foo.example/foo");
    bar = factory.createURI("http://www.foo.example/bar");


    con = store.getConnection();


    iter = con.evaluate(query, EmptyBindingSet.getInstance(), false);


    bindingSet = iter.next();


    assertEquals(bindingSet.getValue("X"), foo);
    assertEquals(bindingSet.getValue("P"), RDF.TYPE);

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    throws StoreException
  {
    SailConnection sailCon = getConnection().getSailConnection();


    Cursor<? extends BindingSet> bindingsIter;
    bindingsIter = sailCon.evaluate(query, getBindings(), getIncludeInferred());


    if (maxQueryTime > 0) {
      bindingsIter = new QueryInterruptCursor(bindingsIter, 1000L * maxQueryTime);
    }

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            CloseableIteration<? extends BindingSet, QueryEvaluationException> results;
            int count;
            // s ?p ?o SELECT
            queryStr = "SELECT ?y ?z WHERE { <http://example.org/uriA> ?y ?z }";
            query = parser.parseQuery(queryStr, baseURI);
            results = sc.evaluate(query.getTupleExpr(), query.getDataset(), bindings, false);
            count = 0;
            while (results.hasNext()) {
                count++;
                BindingSet set = results.next();
                URI y = (URI) set.getValue("y");

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            assertTrue(count > 0);


            // s p ?o SELECT using a namespace prefix
            queryStr = "PREFIX foaf: <http://xmlns.com/foaf/0.1/>\n" + "SELECT ?z WHERE { <" + prefix + "thor> foaf:name ?z }";
            query = parser.parseQuery(queryStr, baseURI);
            results = sc.evaluate(query.getTupleExpr(), query.getDataset(), bindings, false);
            count = 0;
            languages = new HashSet<String>();
            while (results.hasNext()) {
                count++;
                BindingSet set = results.next();

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            // ?s p o SELECT using a plain literal value with no language tag
            queryStr = "PREFIX rdfs: <http://www.w3.org/2000/01/rdf-schema#>\n" + "SELECT ?s WHERE { ?s rdfs:comment \"he really knows where his towel is\" }";
            URI fordUri = sail.getValueFactory().createURI(prefix + "ford");
            query = parser.parseQuery(queryStr, baseURI);
            results = sc.evaluate(query.getTupleExpr(), query.getDataset(), bindings, false);
            count = 0;
            while (results.hasNext()) {
                count++;
                BindingSet set = results.next();
                URI s = (URI) set.getValue("s");

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            assertTrue(count > 0);


            // ?s p o SELECT using a language-specific literal value
            queryStr = "PREFIX foaf: <http://xmlns.com/foaf/0.1/>\n" + "SELECT ?s WHERE { ?s foaf:name \"Thor\"@en }";
            query = parser.parseQuery(queryStr, baseURI);
            results = sc.evaluate(query.getTupleExpr(), query.getDataset(), bindings, false);
            count = 0;
            while (results.hasNext()) {
                count++;
                BindingSet set = results.next();
                URI s = (URI) set.getValue("s");

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            assertTrue(count > 0);


            // The language tag is necessary
            queryStr = "PREFIX foaf: <http://xmlns.com/foaf/0.1/>\n" + "SELECT ?s WHERE { ?s foaf:name \"Thor\" }";
            query = parser.parseQuery(queryStr, baseURI);
            results = sc.evaluate(query.getTupleExpr(), query.getDataset(), bindings, false);
            count = 0;
            while (results.hasNext()) {
                count++;
                results.next();
            }

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            assertEquals(0, count);


            // ?s p o SELECT using a typed literal value
            queryStr = "PREFIX foaf: <http://xmlns.com/foaf/0.1/>\n" + "PREFIX xsd: <http://www.w3.org/2001/XMLSchema#>\n" + "SELECT ?s WHERE { ?s foaf:msnChatID \"Thorster123\"^^xsd:string }";
            query = parser.parseQuery(queryStr, baseURI);
            results = sc.evaluate(query.getTupleExpr(), query.getDataset(), bindings, false);
            count = 0;
            while (results.hasNext()) {
                count++;
                BindingSet set = results.next();
                URI s = (URI) set.getValue("s");

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            assertTrue(count > 0);


            // The data type is necessary
            queryStr = "PREFIX foaf: <http://xmlns.com/foaf/0.1/>\n" + "PREFIX xsd: <http://www.w3.org/2001/XMLSchema#>\n" + "SELECT ?s WHERE { ?s foaf:msnChatID \"Thorster123\" }";
            query = parser.parseQuery(queryStr, baseURI);
            results = sc.evaluate(query.getTupleExpr(), query.getDataset(), bindings, false);
            count = 0;
            while (results.hasNext()) {
                count++;
                results.next();
            }

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