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

     * @param product The product to store
     */
    public static void storeProduct(Product product)
    {
        Implementation impl = OJB.getInstance();
        Transaction    tx   = impl.newTransaction();


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

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     * @return The product if found
     */
    public static Product findProductByName(String name) throws Exception
    {
        Implementation impl = OJB.getInstance();
        Transaction    tx   = impl.newTransaction();


        tx.begin();


        OQLQuery query = impl.newOQLQuery();


        query.create("select products from " + Product.class.getName() + " where name = $1");
        query.bind(name);


        DList   results = (DList)query.execute();
        Product product = (Product)results.iterator().next();


        tx.commit();
        return product;
    }

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     * @param number  The number of items to sell
     */
    public static void sellProduct(Product product, int number)
    {
        Implementation impl = OJB.getInstance();
        Transaction    tx   = impl.newTransaction();


        tx.begin();


        tx.lock(product, Transaction.WRITE);
        product.setStock(product.getStock() -  number);


        tx.commit();
    }

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     * @param product The product to delete
     */
    public static void deleteProduct(Product product)
    {
        Implementation impl = OJB.getInstance();
        Transaction    tx = impl.newTransaction();


        tx.begin();


        Database db = impl.getDatabase(product);


        db.deletePersistent(product);


        tx.commit();
    }

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        System.out.println("The list of available products:");


        try
        {
            // 1. open a transaction
            Transaction tx = odmg.newTransaction();


            tx.begin();


            // 2. get an OQLQuery object from the ODMG facade
            OQLQuery query = odmg.newOQLQuery();


            // 3. set the OQL select statement
            query.create("select allproducts from " + Product.class.getName());


            // 4. perform the query and store the result in a persistent Collection
            DList allProducts = (DList) query.execute();


            tx.commit();


            // 5. now iterate over the result to print each product
            for (Iterator iter = allProducts.iterator(); iter.hasNext();)
            {
                System.out.println(iter.next());

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        // clean up roots map
        clearNRM();


        Article example = createArticle();


        Transaction tx = odmg.newTransaction();
        tx.begin();
        try
        {
            db.bind(example, bindingName);
            Article value = (Article) db.lookup(bindingName);
            assertTrue("Could not lookup object for binding name: "+bindingName, value != null);
            tx.commit();
        }
        catch (ObjectNameNotFoundException ex)
        {
            // tx.abort();
            fail("name " + bindingName + " should not be unknown. "+ex.getMessage());
        }
        catch (ObjectNameNotUniqueException e)
        {
            // tx.abort();
            fail("should not have happened: " + e.getMessage());
        }


        try
        {
            tx.begin();
            db.bind(example, bindingName);
            tx.commit();
            fail("We expected a ObjectNameNotUniqueException, but was not thrown");
        }
        catch (ObjectNameNotUniqueException ex)
        {
            // we wait for this exception
            assertTrue(true);
            tx.abort();
        }


        try
        {
            tx.begin();
            db.unbind(bindingName);
            tx.commit();
        }
        catch (ObjectNameNotFoundException ex)
        {
            fail("Can't unbind " + bindingName + ": "+ex.getMessage());
        }

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        // get facade instance
        Implementation odmg = OJB.getInstance();
        Database db = odmg.newDatabase();
        //open database
        db.open(databaseName, Database.OPEN_READ_WRITE);
        Transaction tx = odmg.newTransaction();
        tx.begin();
        db.bind(odmg.newDList(), bindingName);


        foundList = (DList)db.lookup(bindingName);
        assertTrue("Could not found bound DList", foundList != null);
        foundList = null;


        db.unbind(bindingName);
        try
        {
            foundList = (DList) db.lookup(bindingName);
            fail("Found unbound DList");
        }
        catch (ObjectNameNotFoundException ex)
        {
        }


        db.bind(odmg.newDList(), bindingName);
        try
        {
            foundList = (DList) db.lookup(bindingName);
        }
        catch (ObjectNameNotFoundException ex)
        {
            fail("Could not found bound DList, binding name was: "+bindingName);
        }
        foundList = null;
        tx.commit();


        tx = odmg.newTransaction();
        tx.begin();
        try
        {
            DList newList = (DList)db.lookup(bindingName);
            db.unbind(bindingName);
        }
        catch (ObjectNameNotFoundException ex)
        {
            fail("Could not found bound DList in new tx");
        }
        tx.commit();


        db.close();
    }

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        Database db = odmg.newDatabase();
        db.open(databaseName, Database.OPEN_READ_WRITE);


        // clear named roots.
        clearNRM();
        Transaction tx = odmg.newTransaction();
        //bind object to name
        tx.begin();
        Article example = createArticle();
        Identity oid = new Identity(example, ((HasBroker)tx).getBroker());


        try 
        {
            db.bind(example, bindingName);
            tx.commit();
        }
        catch (ObjectNameNotUniqueException ex)
        {
            tx.abort();
            fail(ex.getMessage());
        }


        // TestThreadsNLocks look up
        Article lookedUp1 = null;
        tx = odmg.newTransaction();
        tx.begin();


        try
        {
            // lookup by name binding
            lookedUp1 = (Article) db.lookup(bindingName);
        }
        catch (ObjectNameNotFoundException ex)
        {
            fail("lookup by name: " + bindingName + " should not be unknown");
        }


        tx.commit();


        // looking up object by OID should return same Object as by name
        assertEquals("lookups should return identical object", example, lookedUp1);


        try
        {
            tx.begin();
            db.unbind(bindingName);
            tx.commit();
        }
        catch (ObjectNameNotFoundException ex)
        {
            fail("Can't unbind " + bindingName + ": "+ex.getMessage());
        }

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        }


        // clear named roots.
        clearNRM();


        Transaction tx = odmg.newTransaction();
        // 1. perform binding
        tx.begin();


        Article example = createArticle();


        try
        {
            db.bind(example, name);
            tx.commit();
        }
        catch (ObjectNameNotUniqueException ex)
        {
            tx.abort();
            fail(ex.getMessage());
        }


        // 2. perform unbind
        tx = odmg.newTransaction();
        tx.begin();
        try
        {
            db.unbind(name);
            tx.commit();
        }
        catch (ObjectNameNotFoundException ex)
        {
            tx.abort();
            fail("name " + name + "should be known");
        }


        // 3. check if name is really unknown now
        tx = odmg.newTransaction();
        tx.begin();
        try
        {
            Article value = (Article) db.lookup(name);
        }
        catch (ObjectNameNotFoundException ex)
        {
            // OK !
            tx.commit();
            // close database
            try
            {
                db.close();
            }
            catch (ODMGException e)
            {
                fail("ODMGException: " + e.getMessage());
            }


            return;
        }


        // NOT OK!
        tx.abort();
        db.close();
        fail("name " + name + " should not be known after unbind");


    }

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    public void testStoreFKnoPK() throws Exception
    {
        long timestamp = System.currentTimeMillis();
        try
        {
            Transaction tx = odmg.newTransaction();
            tx.begin();
            Master master_1 = populatedMasterFKnoPK(tx, 5, timestamp);
            Master master_2 = populatedMasterFKnoPK(tx, 5, timestamp);


            database.makePersistent(master_1);
            database.makePersistent(master_2);
            tx.commit();


            // Check stored objects
            OQLQuery query = odmg.newOQLQuery();
            query.create("select masters from " + Master.class.getName() + " where masterText like $1");
            query.bind("%" + timestamp);

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