Sunday, April 15, 2007

hibernate transaction -- a comprehensive intro

-- from http://www.hibernate.org/42.html, which also covers ejb, cmt, jdbc, interceptor ...

1-sentence intro: Usually you also flush a Session at the end of a
unit of work to execute the SQL DML operations (UPDATE, INSERT,
DELETE) that synchronize the in-memory Session state with the
database.

Hibernate disables or expects the environment (in J2EE/JEE) to disable
auto-commit mode

-- sess vs tx
A single Hibernate Session might have the same scope as a single database transaction. DB server probably maintains a session for each connection. I would speculate

1 hib-session - 1 server-session

-- hibernate && jta
Hibernate works in any environment that uses JTA, in fact, we recommend to use JTA whenever possible as it is the standard Java transaction interface. You get JTA built-in with all J2EE/JEE application servers, and each Datasource you use in such a container is automatically handled by a JTA TransactionManager.

-- no jta@@
If you don't have JTA and don't want to deploy it along with your application, you will usually have to fall back to JDBC transaction demarcation. Instead of calling the JDBC API you better use Hibernate's Transaction interface

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