Examples with QueryExecution org.apache.jena.query.QueryExecution used on opensource projects

Example 11 with QueryExecution

use of org.apache.jena.query.QueryExecution in project jena by apache.

the class QueryEngineTest method testSelectAllType.

@Test
public void testSelectAllType() {
    final SecurityEvaluator eval = new MockSecurityEvaluator(true, true, true, true, true, true) {

        @Override
        public boolean evaluate(Object principal, final Action action, final Node graphIRI, final Triple triple) {
            if (triple.getSubject().isURI() && triple.getSubject().getURI().equals("http://example.com/resource/1")) {
                return false;
            }
            return super.evaluate(principal, action, graphIRI, triple);
        }
    };
    final SecuredModel model = Factory.getInstance(eval, "http://example.com/securedModel", baseModel);
    try {
        String query = "SELECT ?s ?p ?o WHERE " + " { ?s ?p ?o } ";
        try (QueryExecution qexec = QueryExecutionFactory.create(query, model)) {
            final ResultSet results = qexec.execSelect();
            int count = 0;
            for (; results.hasNext(); ) {
                count++;
                results.nextSolution();
            }
            // 2x 3 values + type triple
            Assert.assertEquals(8, count);
        }
        query = "SELECT ?s ?p ?o WHERE " + " { GRAPH ?g {?s ?p ?o } }";
        try (QueryExecution qexec = QueryExecutionFactory.create(query, model)) {
            final ResultSet results = qexec.execSelect();
            int count = 0;
            for (; results.hasNext(); ) {
                count++;
                results.nextSolution();
            }
            // 2x 3 values + type triple
            // no named graphs so no results.
            Assert.assertEquals(0, count);
        }
    } finally {
        model.close();
    }
}

Example 12 with QueryExecution

use of org.apache.jena.query.QueryExecution in project jena by apache.

the class StoreUtils method storeGraphNames.

public static Iterator<Node> storeGraphNames(Store store) {
    List<Node> x = new ArrayList<Node>();
    String qs = "SELECT ?g { GRAPH ?g { }}";
    QueryExecution qExec = QueryExecutionFactory.create(qs, SDBFactory.connectDataset(store));
    ResultSet rs = qExec.execSelect();
    Var var_g = Var.alloc("g");
    while (rs.hasNext()) {
        Node n = rs.nextBinding().get(var_g);
        x.add(n);
    }
    return x.iterator();
}

Example 13 with QueryExecution

use of org.apache.jena.query.QueryExecution in project jena by apache.

the class ExTDB5 method main.

public static void main(String... argv) {
    // Direct way: Make a TDB-back Jena model in the named directory.
    String directory = "MyDatabases/DB1";
    Dataset dataset = TDBFactory.createDataset(directory);
    // 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(); ) {
            QuerySolution soln = results.nextSolution();
            int count = soln.getLiteral("count").getInt();
            System.out.println("count = " + count);
        }
    } finally {
        qexec.close();
    }
    // Close the dataset.
    dataset.close();
}

Example 14 with QueryExecution

use of org.apache.jena.query.QueryExecution in project jena by apache.

the class SelectBuilderTest method testVarReplacementInSubQuery.

@Test
public void testVarReplacementInSubQuery() throws ParseException {
    Model m = ModelFactory.createDefaultModel();
    Resource r = m.createResource("urn:one");
    m.add(r, m.getProperty("urn:p:one"), m.createTypedLiteral(1));
    m.add(r, m.getProperty("urn:p:two"), m.createTypedLiteral(3));
    m.add(r, m.getProperty("urn:p:three"), m.createTypedLiteral(5));
    r = m.createResource("urn:two");
    m.add(r, m.getProperty("urn:p:one"), m.createTypedLiteral(2));
    m.add(r, m.getProperty("urn:p:two"), m.createTypedLiteral(4));
    m.add(r, m.getProperty("urn:p:three"), m.createTypedLiteral(6));
    SelectBuilder sb = new SelectBuilder().addVar("?x").addVar("?p").addWhere("?x", "?p", "?o").addFilter("?o < ?limit");
    builder.addPrefix("xsd", XSD.getURI()).addVar("?x").addVar("count(?p)", "?c").addWhere("?x", "?p", "?o2").addSubQuery(sb).addGroupBy("?x");
    builder.setVar("?limit", 4);
    QueryExecution qexec = QueryExecutionFactory.create(builder.build(), m);
    ResultSet results = qexec.execSelect();
    assertTrue(results.hasNext());
    for (; results.hasNext(); ) {
        QuerySolution soln = results.nextSolution();
        assertTrue(soln.contains("x"));
        assertTrue(soln.contains("c"));
        if ("urn:one".equals(soln.get("?x").asResource().getURI())) {
            assertEquals(2, soln.get("?c").asLiteral().getInt());
        } else {
            assertEquals(1, soln.get("?c").asLiteral().getInt());
        }
    }
}

Example 15 with QueryExecution

use of org.apache.jena.query.QueryExecution in project jena by apache.

the class SelectBuilderTest method testAggregatorsInSubQuery.

@Test
public void testAggregatorsInSubQuery() throws ParseException {
    Model m = ModelFactory.createDefaultModel();
    Resource r = m.createResource("urn:one");
    m.add(r, m.getProperty("urn:p:one"), m.createTypedLiteral(1));
    m.add(r, m.getProperty("urn:p:two"), m.createTypedLiteral(3));
    m.add(r, m.getProperty("urn:p:three"), m.createTypedLiteral(5));
    r = m.createResource("urn:two");
    m.add(r, m.getProperty("urn:p:one"), m.createTypedLiteral(2));
    m.add(r, m.getProperty("urn:p:two"), m.createTypedLiteral(4));
    m.add(r, m.getProperty("urn:p:three"), m.createTypedLiteral(6));
    SelectBuilder sb = new SelectBuilder().addVar("?x").addVar("max(?o)", "?max").addWhere("?x", "?p", "?o").addGroupBy("?x");
    builder.addPrefix("xsd", XSD.getURI()).addVar("?x").addVar("min(?o2)", "?min").addWhere("?x", "?p2", "?o2").addSubQuery(sb).addFilter("?max = '6'^^xsd:int").addGroupBy("?x");
    QueryExecution qexec = QueryExecutionFactory.create(builder.build(), m);
    ResultSet results = qexec.execSelect();
    assertTrue(results.hasNext());
    for (; results.hasNext(); ) {
        QuerySolution soln = results.nextSolution();
        assertTrue(soln.contains("x"));
        assertTrue(soln.contains("min"));
        assertEquals("urn:two", soln.get("?x").asResource().getURI());
        assertEquals(2, soln.get("?min").asLiteral().getInt());
    }
}