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.

        Implementation odmg = OJB.getInstance();
        Database db = odmg.newDatabase();
        //open database
        db.open(databaseName, Database.OPEN_READ_WRITE);
        Transaction tx = odmg.newTransaction();
        tx.begin();
        db.bind(odmg.newDList(), bindingName);


        foundList = (DList)db.lookup(bindingName);
        assertTrue("Could not found bound DList", foundList != null);
        foundList = null;

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        }
        foundList = null;
        tx.commit();


        tx = odmg.newTransaction();
        tx.begin();
        try
        {
            DList newList = (DList)db.lookup(bindingName);
            db.unbind(bindingName);
        }

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        // clear named roots.
        clearNRM();
        Transaction tx = odmg.newTransaction();
        //bind object to name
        tx.begin();
        Article example = createArticle();
        Identity oid = new Identity(example, ((HasBroker)tx).getBroker());


        try 
        {

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        }


        // TestThreadsNLocks look up
        Article lookedUp1 = null;
        tx = odmg.newTransaction();
        tx.begin();


        try
        {
            // lookup by name binding
            lookedUp1 = (Article) db.lookup(bindingName);

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        // looking up object by OID should return same Object as by name
        assertEquals("lookups should return identical object", example, lookedUp1);


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

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        // clear named roots.
        clearNRM();


        Transaction tx = odmg.newTransaction();
        // 1. perform binding
        tx.begin();


        Article example = createArticle();


        try
        {

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            fail(ex.getMessage());
        }


        // 2. perform unbind
        tx = odmg.newTransaction();
        tx.begin();
        try
        {
            db.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) db.lookup(name);
        }
        catch (ObjectNameNotFoundException ex)

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    {
        long timestamp = System.currentTimeMillis();
        try
        {
            Transaction tx = odmg.newTransaction();
            tx.begin();
            Master master_1 = populatedMasterFKnoPK(tx, 5, timestamp);
            Master master_2 = populatedMasterFKnoPK(tx, 5, timestamp);


            database.makePersistent(master_1);
            database.makePersistent(master_2);

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    {
        final long timestamp = System.currentTimeMillis();
        try
        {
            Transaction tx = odmg.newTransaction();
            tx.begin();


            Master master_1 = populatedMasterFKinPK(tx, 5, timestamp);
            Master master_2 = populatedMasterFKinPK(tx, 5, timestamp);


            database.makePersistent(master_1);

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