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.

        long timestamp = System.currentTimeMillis();
        try
        {
            // 2. Get a list of all Masters
            Transaction tx = odmg.newTransaction();
            tx.begin();
            // 1. Insert some objects into the database, some of them with
            // details in DetailFKinPK, some of them in DetailFKnoPK
            Master master_1 = populatedMasterFKinPK(tx, 7, timestamp);
            Master master_2 = populatedMasterFKinPK(tx, 6, timestamp);
            Master master_3 = populatedMasterFKnoPK(tx, 7, timestamp);

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            tx.lock(master_2, Transaction.WRITE);
            tx.lock(master_3, Transaction.WRITE);
            tx.lock(master_4, Transaction.WRITE);
            tx.commit();


            tx.begin();
            OQLQuery query = odmg.newOQLQuery();
            query.create("select masters from " + Master.class.getName() + " where masterText like $1");
            query.bind("%" + timestamp);
            DList allMasters = (DList) query.execute();

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        obj2.setContractValue2(2);
        try
        {
            // 1. Insert object
            Transaction tx = odmg.newTransaction();
            tx.begin();
            /*
            arminw:
            seems to have problems when within a tx a object
            was stored/deleted.
            Without obj1 test pass

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            {
                fail("Wrong contract found");
            }


            // 2. Delete, then insert object with the same identity
            tx.begin();
            database.deletePersistent(obj2);
            database.makePersistent(obj1);
            tx.commit();
            result = getContract(contractPk, odmg);
            assertEquals("We should found exact one contract", 1, result.size());

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            {
                fail("Wrong contract found");
            }


            // 3. Delete
            tx.begin();
            database.deletePersistent(obj1);
            tx.commit();


            result = getContract(contractPk, odmg);
            if (result.size() > 0)

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        Transaction tx = odmg.newTransaction();


        //perform transaction
        try
        {
            tx.begin();


            Article example = new Article();
            example.setArticleId(777);
            example.setProductGroupId(7);
            db.makePersistent(example);

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        Transaction tx = odmg.newTransaction();


        //perform transaction
        try
        {
            tx.begin();


            OQLQuery query = odmg.newOQLQuery();
            query.create("select anArticle from " + Article.class.getName() + " where articleId = 60");
            List results = (List) query.execute();

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            fail("ODMGException: " + ex.getMessage());
        }
        Transaction tx = odmg.newTransaction();


        // perform transaction
        tx.begin();


        OQLQuery query = odmg.newOQLQuery();
        // use 'like' instead of '=' when perform query with wildcards
        query.create(
                "select anArticle from " + Article.class.getName() + " where productGroup.groupName like \"Fruit*\"");

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        Transaction tx = odmg.newTransaction();


        //perform transaction
        try
        {
            tx.begin();


            OQLQuery query = odmg.newOQLQuery();
            query.create("select x from " + Article.class.getName() + " where productGroupId = 7");
            DList results = (DList) query.execute();

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            db.bind(results, name);
            tx.commit();


            tx = odmg.newTransaction();
            tx.begin();


            ((TransactionImpl) tx).getBroker().clearCache();


            // look it up again
            DList newResults = (DList) db.lookup(name);

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