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.

        //***********************
        // do the procedure again
        odmgZoosBefore = getDBObjectCountWithNewPB(ODMGZoo.class);
        projectsBefore = getDBObjectCountWithNewPB(Project.class);
        // we reuse current tx
        tx.begin();
        storeObjects(tx, getNewODMGZoos("testUserRollbackWithCheckpoint", 10));
        // now we store objects to DB
        tx.checkpoint();
        storeObjects(tx, getNewProjects("testUserRollbackWithCheckpoint", 10));
        //we abort tx, all actions after the last checkpoint call should be rollback

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    }


    protected int getDBObjectCountViaOqlQueryUseNewTransaction(Implementation odmg, Class target) throws Exception
    {
        Transaction tx = odmg.newTransaction();
        tx.begin();
        OQLQuery query = odmg.newOQLQuery();
        query.create("select allProjects from " + target.getName());
        List list = (List) query.execute();
        tx.commit();
        return list.size();

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    }


    protected void deleteAll(Implementation odmg, Class target) throws Exception
    {
        Transaction tx = odmg.newTransaction();
        tx.begin();
        try
        {
            OQLQuery query = odmg.newOQLQuery();
            query.create("select allObjects from " + target.getName());
            List list = (List) query.execute();

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    public void testDuplicateLocking() throws Exception
    {
        RollbackObjectOne ro = null;


        Transaction tx = odmg.newTransaction();
        tx.begin();
        ro = new RollbackObjectOne();
        ro.setName("test_step_1");
        tx.lock(ro, Transaction.WRITE);
        tx.lock(ro, Transaction.WRITE);
        tx.commit();

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        ro.setName("test_step_1");
        tx.lock(ro, Transaction.WRITE);
        tx.lock(ro, Transaction.WRITE);
        tx.commit();


        tx.begin();
        tx.lock(ro, Transaction.WRITE);
        tx.lock(ro, Transaction.WRITE);
        ro.setName("test_step_2");
        tx.commit();

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        tx.lock(ro, Transaction.WRITE);
        tx.lock(ro, Transaction.WRITE);
        ro.setName("test_step_2");
        tx.commit();


        tx.begin();
        tx.lock(ro, Transaction.WRITE);
        ro.setName("test_step_3");
        tx.lock(ro, Transaction.WRITE);
        tx.commit();
    }

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        RollbackObjectOne ro = null;
        RollbackObjectOne ro_2 = null;
        String name = "testCheckCacheAfterRollback_"+System.currentTimeMillis();


        Transaction tx = odmg.newTransaction();
        tx.begin();
        ro = new RollbackObjectOne();
        ro.setName(name);
        tx.lock(ro, Transaction.WRITE);


        ro_2 = new RollbackObjectOne();

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        ro_2.setName(name);
        tx.lock(ro_2, Transaction.WRITE);
        tx.commit();


        tx = odmg.newTransaction();
        tx.begin();
        OQLQuery query = odmg.newOQLQuery();
        query.create("select all from " + RollbackObjectOne.class.getName() + " where name like $1");
        query.bind(name);
        List list = (List) query.execute();
        tx.commit();

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        List list = (List) query.execute();
        tx.commit();
        assertEquals(2,list.size());


        tx = odmg.newTransaction();
        tx.begin();
        tx.lock(ro, Transaction.WRITE);
        ro = new RollbackObjectOne();
        ro.setDescription(name);


        tx.lock(ro_2, Transaction.WRITE);

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        ro_2.setDescription(name);


        tx.abort();


        tx = odmg.newTransaction();
        tx.begin();
        query = odmg.newOQLQuery();
        query.create("select all from " + RollbackObjectOne.class.getName() + " where name like $1");
        query.bind(name);
        list = (List) query.execute();
        tx.commit();

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