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.

        Transaction tx = odmg.newTransaction();


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


            OQLQuery query = odmg.newOQLQuery();
            query.create("select anArticle from " + Article.class.getName() + " where articleId = $678");
            query.bind(new Integer(30));

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        Transaction tx = odmg.newTransaction();


        //perform transaction
        try
        {
            tx.begin();
            OQLQuery query = odmg.newOQLQuery();
            query.create("select aLotOfArticles from " + Article.class.getName() + " where productGroupId = 4");


            DCollection results = (DCollection) query.execute();
            results = results.query("price > 35");

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


            // retrieve an Article
            OQLQuery query = odmg.newOQLQuery();
            query.create("select anArticle from " + Article.class.getName() + " where articleId = $678");
            query.bind(new Integer(30));

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    {
        // TODO: fix this!
        if(ojbSkipKnownIssueProblem()) return;


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


        ProductGroup pg1 = new ProductGroup();
        pg1.setName("BatchModeTest ProductGroup #1");
        database.makePersistent(pg1);

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        int odmgZoosBefore = getDBObjectCountWithNewPB(((DatabaseImpl) db_1).getPBKey(), ODMGZoo.class);
        int projectsBefore = getDBObjectCountWithNewPB(((DatabaseImpl) db_1).getPBKey(), Project.class);
        int farAwaysBefore = getDBObjectCountWithNewPB(((DatabaseImpl) db_2).getPBKey(), FarAwayClass.class);


        Transaction tx_1 = odmg_1.newTransaction();
        tx_1.begin();
        //store
        storeObjects(tx_1, getNewODMGZoos(5));
        storeObjects(tx_1, getNewProjects(3));
        //store more
        storeObjects(tx_1, getNewODMGZoos(5));

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        storeObjects(tx_1, getNewODMGZoos(5));
        storeObjects(tx_1, getNewProjects(2));
        tx_1.commit();


        Transaction tx_2 = odmg_2.newTransaction();
        tx_2.begin();
        //store
        storeObjects(tx_2, getNewFarAways(9));
        //store more
        storeObjects(tx_2, getNewFarAways(11));
        tx_2.commit();

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        //store more
        storeObjects(tx_1, getNewODMGZoos(5));
        storeObjects(tx_1, getNewProjects(2));
        tx_1.commit();


        tx_2.begin();
        //store
        storeObjects(tx_2, getNewFarAways(9));
        //store more
        storeObjects(tx_2, getNewFarAways(11));
        tx_2.commit();

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    }


    public void testDelete() throws Exception
    {
        Transaction tx_1 = odmg_1.newTransaction();
        tx_1.begin();
        deleteObjects(db_1, getAllObjects(odmg_1, ODMGZoo.class));
        deleteObjects(db_1, getAllObjects(odmg_1, Project.class));
        tx_1.commit();


        Transaction tx_2 = odmg_2.newTransaction();

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        deleteObjects(db_1, getAllObjects(odmg_1, ODMGZoo.class));
        deleteObjects(db_1, getAllObjects(odmg_1, Project.class));
        tx_1.commit();


        Transaction tx_2 = odmg_2.newTransaction();
        tx_2.begin();
        deleteObjects(db_2, getAllObjects(odmg_2, FarAwayClass.class));
        tx_2.commit();


        int odmgZoosAfter = getDBObjectCountWithNewPB(((DatabaseImpl) db_1).getPBKey(), ODMGZoo.class);
        int projectsAfter = getDBObjectCountWithNewPB(((DatabaseImpl) db_1).getPBKey(), Project.class);

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    }


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

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