Examples with RDFConnection org.apache.jena.rdfconnection.RDFConnection used on opensource projects

Example 16 with RDFConnection

use of org.apache.jena.rdfconnection.RDFConnection in project jena by apache.

the class RDFConnectionExample2 method main.

public static void main(String... args) {
    Query query = QueryFactory.create("SELECT * { {?s ?p ?o } UNION { GRAPH ?g { ?s ?p ?o } } }");
    Dataset dataset = DatasetFactory.createTxnMem();
    try (RDFConnection conn = RDFConnectionFactory.connect(dataset)) {
        System.out.println("** Load a file");
        // ---- Transaction 1: load data. 
        Txn.executeWrite(conn, () -> conn.load("data.ttl"));
        // ---- Transaction 2: explicit styles 
        conn.begin(ReadWrite.WRITE);
        conn.load("http://example/g0", "data.ttl");
        System.out.println("** Inside multistep transaction - query dataset");
        conn.queryResultSet(query, ResultSetFormatter::out);
        conn.abort();
        conn.end();
        System.out.println("** After abort 1");
        // ---- Transaction 3: explicit styles
        Txn.executeWrite(conn, () -> {
            conn.load("http://example/g0", "data.ttl");
            System.out.println("** Inside multistep transaction - fetch dataset");
            Dataset ds2 = conn.fetchDataset();
            RDFDataMgr.write(System.out, ds2, Lang.TRIG);
            conn.abort();
        });
        System.out.println("** After abort 2");
        // Only default graph showing.
        conn.queryResultSet(query, ResultSetFormatter::out);
    }
}

Example 17 with RDFConnection

use of org.apache.jena.rdfconnection.RDFConnection in project jena by apache.

the class AbstractTestRDFConnection method query_ask_02.

@Test
public void query_ask_02() {
    try (RDFConnection conn = connection()) {
        boolean b = conn.queryAsk("ASK{}");
        assertTrue(b);
    }
}

Example 18 with RDFConnection

use of org.apache.jena.rdfconnection.RDFConnection in project jena by apache.

the class AbstractTestRDFConnection method named_graph_load_1.

// DELETE
// Named graphs
@Test
public void named_graph_load_1() {
    String testDataFile = DIR + "data.ttl";
    Model m0 = RDFDataMgr.loadModel(testDataFile);
    try (RDFConnection conn = connection()) {
        conn.load(graphName, testDataFile);
        Model m = conn.fetch(graphName);
        assertTrue("Models not isomorphic", isomorphic(m0, m));
        Model mDft = conn.fetch();
        assertTrue(mDft.isEmpty());
    }
}

Example 19 with RDFConnection

use of org.apache.jena.rdfconnection.RDFConnection in project jena by apache.

the class AbstractTestRDFConnection method dataset_put_1.

@Test
public void dataset_put_1() {
    try (RDFConnection conn = connection()) {
        conn.putDataset(dataset);
        Dataset ds1 = conn.fetchDataset();
        assertTrue("Datasets not isomorphic", isomorphic(dataset, ds1));
    }
}

Example 20 with RDFConnection

use of org.apache.jena.rdfconnection.RDFConnection in project jena by apache.

the class AbstractTestRDFConnection method query_select_01.

@Test
public void query_select_01() {
    AtomicInteger counter = new AtomicInteger(0);
    try (RDFConnection conn = connection()) {
        Txn.executeWrite(conn, () -> conn.loadDataset(DIR + "data.trig"));
        Txn.executeRead(conn, () -> conn.querySelect("SELECT * { ?s ?p ?o }", (r) -> counter.incrementAndGet()));
        assertEquals(2, counter.get());
    }
}