Introduction to Hibernate

What is Configuration?

ØThe Configuration class is available in org.hibernate.cfg package

ØThis Class loads hibernate configuration file

ØHibernate Configuration file contains hibernate properties such as

Database Connection properties

Connection pool properties

Print all generated SQL Statements to console properties

Transaction properties

Disable or enable auto commit mode

Enabling or disabling Second level caching properties

Database Schema auto generation properties

What is SessionFactory?

ØIt the class of that implemented org.hibernate.SessionFactory interface

ØThis class instance is produced by buildSessionFactory() method

ØThis class creates pool of connections

ØThis class produces Session instance

What is Session?

ØThis class that implemented org.hibernate.Session interface.

ØThis class instance is produced by SessionFactory class openSession() method

ØThis class holds connection object and performs save(),saveOrUpdate(), update(), load(),get(),delete() method

ØDetermines optimistic way to do DB operations such as by determining statement/ Prepared Statement Object is better to improve the performance of DB interactions

What is Transaction class

This is class of that implemented org.hibernate.Transaction

This class instance is created when beginTransaction() method is called on SessionObject

The Transaction is completed by calling commit() or rollback() method