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

org.openrdf.sail.SailConnection.begin()
Begins a transaction requiring {@link #commit()} or {@link #rollback()} tobe called to close the transaction. @throws StoreException If the connection could not start a transaction, or if it already has an active transaction. @see #isAutoCommit()


    @Test
    public void testGetNamespaces() throws Exception {
        SailConnection sc = sail.getConnection();
        try {
            sc.begin();
            CloseableIteration<? extends Namespace, SailException> namespaces;
            int before = 0, during = 0, after = 0;
            // just iterate through all namespaces
            namespaces = sc.getNamespaces();
            while (namespaces.hasNext()) {

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            String namePrefix = "http://example.org/test";
            for (int i = 0; i < nTests; i++) {
                sc.setNamespace(prefixPrefix + i, namePrefix + i);
            }
            sc.commit();
            sc.begin();
            namespaces = sc.getNamespaces();
            while (namespaces.hasNext()) {
                Namespace ns = namespaces.next();
                during++;
                String prefix = ns.getPrefix();

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            namespaces.close();
            for (int i = 0; i < nTests; i++) {
                sc.removeNamespace(prefixPrefix + i);
            }
            sc.commit();
            sc.begin();
            namespaces = sc.getNamespaces();
            while (namespaces.hasNext()) {
                namespaces.next();
                after++;
            }

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    @Test
    public void testSetNamespace() throws Exception {
        SailConnection sc = sail.getConnection();
        try {
            sc.begin();
            String prefix = "foo";
            String emptyPrefix = "";
            String name = "http://example.org/foo";
            String otherName = "http://example.org/bar";

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            String otherName = "http://example.org/bar";


            sc.removeNamespace(prefix);
            sc.removeNamespace(emptyPrefix);
            sc.commit();
            sc.begin();


            // Namespace initially absent?
            assertNull(sc.getNamespace(prefix));
            assertNull(sc.getNamespace(emptyPrefix));

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            assertNull(sc.getNamespace(emptyPrefix));


            // Can we set the namespace?
            sc.setNamespace(prefix, name);
            sc.commit();
            sc.begin();
            assertEquals(sc.getNamespace(prefix), name);


            // Can we reset the namespace?
            sc.setNamespace(prefix, otherName);
            sc.commit();

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            assertEquals(sc.getNamespace(prefix), name);


            // Can we reset the namespace?
            sc.setNamespace(prefix, otherName);
            sc.commit();
            sc.begin();
            assertEquals(sc.getNamespace(prefix), otherName);


            // Can we use an empty namespace prefix?
            sc.setNamespace(emptyPrefix, name);
            sc.commit();

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            assertEquals(sc.getNamespace(prefix), otherName);


            // Can we use an empty namespace prefix?
            sc.setNamespace(emptyPrefix, name);
            sc.commit();
            sc.begin();
            assertEquals(sc.getNamespace(emptyPrefix), name);
        } finally {
            sc.rollback();
            sc.close();
        }

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    @Test
    public void testRemoveNamespace() throws Exception {
        SailConnection sc = sail.getConnection();
        try {
            sc.begin();
            String prefix = "foo";
            String emptyPrefix = "";
            String name = "http://example.org/foo";


            // Set namespace initially.

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            String name = "http://example.org/foo";


            // Set namespace initially.
            sc.setNamespace(prefix, name);
            sc.commit();
            sc.begin();
            assertEquals(sc.getNamespace(prefix), name);


            // Remove the namespace and make sure it's gone.
            sc.removeNamespace(prefix);
            sc.commit();

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