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.

    public void testDBag() throws Exception
    {
        String name = "testDBag_" + System.currentTimeMillis();


        Transaction tx = odmg.newTransaction();
        tx.begin();
        DBag bag1 = odmg.newDBag();
        DBag bag2 = odmg.newDBag();
        DObject a, b, c, d, e;
        a = createObject(name);
        b = createObject(name);

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        // now perform persistence operations


        // 3. open transaction
        Transaction tx = odmg.newTransaction();


        tx.begin();


        // 4. acquire write lock on new object
        tx.lock(newProduct, Transaction.WRITE);


        // 5. commit transaction

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    public static void storeProduct(Product product)
    {
        Implementation impl = OJB.getInstance();
        Transaction    tx   = impl.newTransaction();


        tx.begin();
        tx.lock(product, Transaction.WRITE);
        tx.commit();
    }


    /**

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    public static Product findProductByName(String name) throws Exception
    {
        Implementation impl = OJB.getInstance();
        Transaction    tx   = impl.newTransaction();


        tx.begin();


        OQLQuery query = impl.newOQLQuery();


        query.create("select products from " + Product.class.getName() + " where name = $1");
        query.bind(name);

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    public static void sellProduct(Product product, int number)
    {
        Implementation impl = OJB.getInstance();
        Transaction    tx   = impl.newTransaction();


        tx.begin();


        tx.lock(product, Transaction.WRITE);
        product.setStock(product.getStock() -  number);


        tx.commit();

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    public static void deleteProduct(Product product)
    {
        Implementation impl = OJB.getInstance();
        Transaction    tx = impl.newTransaction();


        tx.begin();


        Database db = impl.getDatabase(product);


        db.deletePersistent(product);

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        try
        {
            // 1. open a transaction
            Transaction tx = odmg.newTransaction();


            tx.begin();


            // 2. get an OQLQuery object from the ODMG facade
            OQLQuery query = odmg.newOQLQuery();


            // 3. set the OQL select statement

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        clearNRM();


        Article example = createArticle();


        Transaction tx = odmg.newTransaction();
        tx.begin();
        try
        {
            db.bind(example, bindingName);
            Article value = (Article) db.lookup(bindingName);
            assertTrue("Could not lookup object for binding name: "+bindingName, value != null);

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            fail("should not have happened: " + e.getMessage());
        }


        try
        {
            tx.begin();
            db.bind(example, bindingName);
            tx.commit();
            fail("We expected a ObjectNameNotUniqueException, but was not thrown");
        }
        catch (ObjectNameNotUniqueException ex)

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            tx.abort();
        }


        try
        {
            tx.begin();
            db.unbind(bindingName);
            tx.commit();
        }
        catch (ObjectNameNotFoundException ex)
        {

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