Explicit transactions
Although the framework supports automatic transaction boundaries for objects trees, it is also possible to specify object transactions explicitly using the ObjectTransactionGroup class.
In this example we group a series of Object I/O operations in a single transaction:
ObjectTransactionGroup otg = new ObjectTransactionGroup();
otg.insert(new User("username"));
otg.update(otherObject);
otg.insert(new Role("rolename"));
otg.execute();
Please note that although the objects are in the same Object I/O group, they may end up
being in separate Storage I/O groups depending on TransactionMode defined for each type.
Also, object triggers (cascade) will still apply and may cause other objects to be saved.
For more information on transaction processing, see the extensive transaction documentation.
