Examples of org.odmg.Transaction

org.odmg.Transaction
This interfaces provides the operations necessary to perform database transactions. All access, creation, and modification of persistent objects and their fields must be done within a transaction. Before performing any database operations, a thread must explicitly create a transaction object or associate itself with an existing transaction object (by calling join), and that transaction must be open (through a call to begin). All subsequent operations by the thread, including reads, writes, and lock acquisitions, are done under the thread�s current transaction.
A thread may only operate on its current transaction. For example, a TransactionNotInProgressException is thrown if a thread attempts to begin, commit, checkpoint, or abort a transaction prior to joining itself to that transaction.
A transaction is either open or closed. A transaction is open if a call has been made to begin, but no call has been made to commit or abort. Once commit or abort is called, the transaction is closed. The method isOpen can be called to determine the state of the transaction.
Read locks are implicitly obtained on objects as they are accessed. Write locks are implicitly obtained as objects are modified. Transaction objects are transient, they cannot be stored in the database. @author David Jordan (as Java Editor of the Object Data Management Group) @version ODMG 3.0 @see TransactionNotInProgressException

    public void doTestStoreComplex() throws Exception
    {
        String postfix = "doTestStoreComplex_" + System.currentTimeMillis();
        Movie movie = buildMovieWithActorsAndBackReferences(postfix);


        Transaction tx = odmg.newTransaction();
        tx.begin();
        database.makePersistent(movie);
        tx.commit();


        OQLQuery queryMovie = movieQuery(postfix);
        Collection resultMovie = (Collection) queryMovie.execute();
        assertEquals(3, resultMovie.size());
        Iterator it = resultMovie.iterator();

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    public void doTestStoreComplex_2() throws Exception
    {
        String postfix = "doTestStoreComplex_2_" + System.currentTimeMillis();
        Movie movie = buildMovieWithActorsAndBackReferences(postfix);


        Transaction tx = odmg.newTransaction();
        tx.begin();
        Iterator it = movie.getActors().iterator();
        while(it.hasNext())
        {
            database.makePersistent(it.next());
        }
        database.makePersistent(movie);
        tx.commit();


        OQLQuery queryMovie = movieQuery(postfix);
        Collection resultMovie = (Collection) queryMovie.execute();
        assertEquals(3, resultMovie.size());
        it = resultMovie.iterator();

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        }


        public void runTestCase() throws Throwable
        {
            threadNumber = newThreadKey();
            Transaction tx = odmg.newTransaction();
            for (int i = 0; i < objectUpdates; i++)
            {
                tx.begin();
                updateObject(tx, obj);
                tx.commit();
            }
        }

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     * Store the objects and return the result of the query
     * "select gourmets from " + ODMGGourmet.class.getName() + " where gourmetId=$1"
     */
    private int store(Implementation odmg, Database db, ODMGGourmet gourmet) throws Exception
    {
        Transaction tx = odmg.newTransaction();
        tx.begin();
        db.makePersistent(gourmet);
        tx.commit();


        tx.begin();
        OQLQuery query = odmg.newOQLQuery();
        query = odmg.newOQLQuery();
        query.create("select gourmets from " + ODMGGourmet.class.getName() +
                " where gourmetId=$1");
        query.bind(new Integer(gourmet.getGourmetId()));
        List gourmets = (List) query.execute();
        tx.commit();
        return gourmets.size();
    }

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        /*
        we expect 2 created 'fish'
        */
        assertEquals(2, fishs.size());


        Transaction tx = odmg.newTransaction();
        tx.begin();
        query = odmg.newOQLQuery();
        query.create("select gourmets from " + ODMGGourmet.class.getName() +
                " where name=$1");
        query.bind(doris.getName());
        List result = (List) query.execute();
        assertEquals("We should found a gourmet", 1, result.size());
        ODMGGourmet gourmet = (ODMGGourmet)result.get(0);


        /*
        now we lock main object and add a new reference object
        */
        tx.lock(gourmet, Transaction.WRITE);
        gourmet.addFavoriteFood(goldfish);
        tx.commit();


        query = odmg.newOQLQuery();
        query.create("select fishs from " + Fish.class.getName() +
                " where (name=$1 or name=$2 or name=$3)");
        query.bind(tuna.getName());
        query.bind(trout.getName());
        query.bind(goldfish.getName());


        tx = odmg.newTransaction();
        tx.begin();
        fishs = (List) query.execute();
        tx.commit();
        assertEquals("seems referenced object was not added (if found <3) ",3, fishs.size());
    }

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        /*
        we expect 3 created 'fish'
        */
        assertEquals(3, fishs.size());


        Transaction tx = odmg.newTransaction();
        tx.begin();
        query = odmg.newOQLQuery();
        query.create("select gourmets from " + ODMGGourmet.class.getName() +
                " where name=$1");
        query.bind(doris.getName());
        List result = (List) query.execute();
        assertEquals("We should found a gourmet_doris", 1, result.size());
        ODMGGourmet gourmet_doris = (ODMGGourmet)result.get(0);
        assertEquals(3, gourmet_doris.getFavoriteFood().size());


        /*
        now we lock main object and add remove a reference object
        */
        tx.lock(gourmet_doris, Transaction.WRITE);
        List foodList = gourmet_doris.getFavoriteFood();
        foodList.remove(0);
        //gourmet_doris.setFavoriteFood(foodList);
        tx.commit();


        query = odmg.newOQLQuery();
        query.create("select gourmets from " + ODMGGourmet.class.getName() +
                " where name=$1");
        query.bind(doris.getName());


        tx = odmg.newTransaction();
        tx.begin();
        result = (List) query.execute();
        assertEquals("We should found a gourmet_doris", 1, result.size());
        gourmet_doris = (ODMGGourmet)result.get(0);
        tx.commit();
        assertEquals(
          "We removed one fish, so doris should only have two entries left",
          2, gourmet_doris.getFavoriteFood().size());
    }

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        return lo;
    }


    private void storeObject(Object obj) throws Exception
    {
        Transaction tx = odmg.newTransaction();


        tx.begin();
        tx.lock(obj, Transaction.WRITE);
        tx.commit();
    }

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        //System.out.println("TEST: Database closed");
    }


    private void newSite(Implementation odmg, String name, int year, int semester) throws Exception
    {
        Transaction tx = null;
        tx = odmg.newTransaction();
        Site site = null;
        tx.begin();


        site = new Site();
        site.setName(name);
        site.setYear(new Integer(year));
        site.setSemester(new Integer(semester));


        tx.lock(site, Transaction.WRITE);
        tx.commit();
    }

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        String name = "testSimpleQueryDelete - " + System.currentTimeMillis();


        db.open(databaseName, Database.OPEN_READ_WRITE);
        Site site = new Site();
        site.setName(name);
        Transaction tx = odmg.newTransaction();
        tx.begin();
        tx.lock(site, Transaction.WRITE);
        tx.commit();


        OQLQuery query = odmg.newOQLQuery();
        query.create("select sites from " + Site.class.getName() + " where name=$1");
        query.bind(name);
        tx.begin();
        List result = (List) query.execute();
        if (result.size() == 0)
        {
            fail("Stored object not found");
        }
        tx.commit();


        tx.begin();
        db.deletePersistent(site);
        tx.commit();


        query = odmg.newOQLQuery();
        query.create("select sites from " + Site.class.getName() + " where name=$1");
        query.bind(name);
        tx.begin();
        List result2 = (List) query.execute();
        if (result2.size() > 0)
        {
            fail("We should not found deleted objects");
        }
        tx.commit();
    }

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            /* Create an object */
            Site site = new Site();
            site.setName(name);


            Transaction tx = odmg.newTransaction();
            tx.begin();
            tx.lock(site, Transaction.WRITE);
            tx.commit();


            /* Retrieve from the object created, and set the year*/
            OQLQuery query = odmg.newOQLQuery();
            query.create(queryString);
            query.bind(name);


            tx.begin();
            List result = (List) query.execute();
            assertEquals(1, result.size());
            site = (Site) result.get(0);
            assertNotNull(site);
            assertNull(site.getYear());
            tx.lock(site, Transaction.UPGRADE);
            site.setYear(new Integer(2003));


            tx.commit();


            /* Flush the cache, and retrieve the object again */
            query = odmg.newOQLQuery();
            query.create(queryString);
            query.bind(name);
            tx.begin();
            ((HasBroker) tx).getBroker().clearCache();
            result = (List) query.execute();
            assertEquals(1, result.size());
            site = (Site) result.get(0);
            assertNotNull(site);
            assertNotNull("year should not be null", site.getYear());
            tx.commit();


            db.close();
        }
        finally
        {

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