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.

        List result;
        int before;
        Transaction tx = odmg.newTransaction();
        try
        {
            tx.begin();


            OQLQuery query = odmg.newOQLQuery();
            query.create(strQuery);
            result = (List) query.execute();
            before = result.size();

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            database.makePersistent(child);


            tx.commit();


            tx.begin();
            query = odmg.newOQLQuery();
            query.create(strQuery);
            result = (List) query.execute();
            tx.commit();
        }

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        List result;
        int before;


        try
        {
            tx.begin();
            OQLQuery query = odmg.newOQLQuery();
            query.create(strQuery);
            result = (List) query.execute();
            before = result.size();

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            before = result.size();


            tx.lock(child, Transaction.WRITE);
            tx.commit();


            tx.begin();
            query = odmg.newOQLQuery();
            query.create(strQuery);
            result = (List) query.execute();
            tx.commit();
        }

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        /*
         * lock only the father, let OJB do the rest
         */
        Transaction tx = odmg.newTransaction();
        tx.begin();
        tx.lock(father, Transaction.WRITE);
        tx.commit();


        // without running tx, should not take effect
        father.setChildren(null);

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        // without running tx, should not take effect
        father.setChildren(null);
        father.setFirstname(null);


        tx.begin();
        // make sure all objects are retrieved freshly in subsequent transactions
        ((TransactionImpl) tx).getBroker().clearCache();
        OQLQuery qry = odmg.newOQLQuery();
        qry.create("select a from " + PersonImpl.class.getName() + " where firstname=$1");
        qry.bind(firstnameFather);

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        /*
         delete father then children
         fk-constraints?
         */
        tx.begin();
        database.deletePersistent(returnedFather);
        database.deletePersistent(returnedFather.getChildren()[0]);
        database.deletePersistent(returnedFather.getChildren()[1]);


        tx.commit();

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        /*
         lock father then all childs
         */
        Transaction tx = odmg.newTransaction();
        tx.begin();
        tx.lock(father, Transaction.WRITE);
        tx.lock(child_2, Transaction.WRITE);
        tx.lock(child_1, Transaction.WRITE);
        tx.commit();

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        // without running tx, should not take effect
        father.setChildren(null);
        father.setFirstname(null);


        tx.begin();
        // make sure all objects are retrieved freshly in subsequent transactions
        ((TransactionImpl) tx).getBroker().clearCache();
        OQLQuery qry = odmg.newOQLQuery();
        qry.create("select a from " + PersonImpl.class.getName() + " where firstname=$1");
        qry.bind(firstnameFather);

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        /*
         delete children then father
         fk-constraints?
         */
        tx.begin();
        database.deletePersistent(returnedFather.getChildren()[0]);
        database.deletePersistent(returnedFather.getChildren()[1]);
        database.deletePersistent(returnedFather);
        tx.commit();

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