The <transactionManager> element
As the name implies, the transaction manager manages transactions (which were
covered in detail in chapter 7) for your DAO classes. The <transactionManager>
element provides the name of a DaoTransactionManager implementation. The
i BATIS DAO framework comes with seven different transaction managers that can
work with different data access tools, as shown in table 10.1.
Transaction managers available with the iBATIS DAO framework
A “do-nothing” transaction that allows you to
manage your own transactions outside of
the iBATIS DAO framework.
HibernateDaoTransactionManager Delegates to the Hibernate transaction man-
Uses JDBC to provide connection pooling
services via the DataSource API. Three
DataSource implementations are sup-
ported: SIMPLE, DBCP, and JNDI.
SIMPLE is an implementation of the iBATIS
SimpleDataSource , which is a stand-alone
implementation ideal for minimal overhead
DBCP is an implementation that uses the
Jakarta DBCP DataSource .
Finally, JNDI is an implementation that
retrieves a DataSource reference from a
JNDI directory. This is the most common and
flexible configuration, as it allows you to cen-
trally configure your application via your
Manages transactions using the Java Trans-
action Architecture (JTA) API.
Requires that the DataSource implementa-
tion be retrieved via JNDI and that User-
Transaction instances also be accessible
Delegates to the OJB transaction manage-
Delegates to the SQL map transaction man-
Delegates to the TOPLINK transaction man-
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