Examples of org.odmg.Transaction.begin()

org.odmg.Transaction.begin()
Start a transaction. Calling begin multiple times on the same transaction object, without an intervening call to commit or abort, causes the exception TransactionInProgressException to be thrown on the second and subsequent calls. Operations executed before a transaction has been opened, or before reopening after a transaction is aborted or committed, have undefined results; these may throw a TransactionNotInProgressException exception.


    protected void setUp() throws Exception
    {
        super.setUp();
        Transaction tx = odmg.newTransaction();
        tx.begin();
        testProductGroup = new ProductGroup();
        testProductGroup.setGroupName("NamedRootsTest_" + System.currentTimeMillis());
        database.makePersistent(testProductGroup);
        tx.commit();
    }

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        Article article = createArticle();
        Article foundArticle = null;


        Transaction tx = odmg.newTransaction();
        tx.begin();
        database.bind(article, bindingName);


        foundArticle = (Article) database.lookup(bindingName);
        assertNotNull(foundArticle);

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        foundArticle = null;
        tx.commit();


        tx = odmg.newTransaction();
        tx.begin();
        foundArticle = (Article) database.lookup(bindingName);
        assertNotNull(foundArticle);
        database.unbind(bindingName);
        tx.commit();
    }

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    {
        String name = "testUnBind_" + System.currentTimeMillis();


        Transaction tx = odmg.newTransaction();
        //bind object to name
        tx.begin();
        Article example = createArticle();
        database.makePersistent(example);
        tx.commit();


        // 1. perform binding

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        Article example = createArticle();
        database.makePersistent(example);
        tx.commit();


        // 1. perform binding
        tx.begin();
        try
        {
            database.bind(example, name);
            tx.commit();
        }

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            fail(ex.getMessage());
        }


        // 2. perform unbind
        tx = odmg.newTransaction();
        tx.begin();
        try
        {
            database.unbind(name);
            tx.commit();
        }

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            fail("name " + name + "should be known");
        }


        // 3. check if name is really unknown now
        tx = odmg.newTransaction();
        tx.begin();
        try
        {
            Article value = (Article) database.lookup(name);
            assertNotNull("Should not find unbind name '" + name+"'", value);
            fail("name " + name + " should not be known after unbind");

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    protected void setUp() throws Exception
    {
        super.setUp();
        Transaction tx = odmg.newTransaction();
        tx.begin();
        productGroup = new ProductGroup();
        productGroup.setName("DMapTest_" + System.currentTimeMillis() + "_");
        database.makePersistent(productGroup);
        tx.commit();
    }

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        // create a unique name:
        final String name = "testReadAndStore_" + System.currentTimeMillis();


        // create test objects
        Transaction tx = odmg.newTransaction();
        tx.begin();
        // add objects to list
        for (int i = 0; i < 5; i++)
        {
            tx.lock(createObject(name), Transaction.WRITE);
        }

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        {
            tx.lock(createObject(name), Transaction.WRITE);
        }
        tx.commit();


        tx.begin();
        // query test objects
        OQLQuery q = odmg.newOQLQuery();
        q.create("select all from "+DObject.class.getName()+" where name=$1");
        q.bind(name);
        Collection ret = (Collection) q.execute();

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