Elements of Hibernate Architecture

 

For creating the first hibernate application, we must know the elements of Hibernate architecture. They are as follows:

SessionFactory

The SessionFactory is a factory of session and client of ConnectionProvider. 

It holds second level cache (optional) of data.

The org.hibernate.SessionFactory interface provides factory method to get the object of Session.

Session

The session object provides an interface between the application and data stored in the database. 

It is a short-lived object and wraps the JDBC connection. 

It is factory of Transaction, Query and Criteria. 

It holds a first-level cache (mandatory) of data. 

The org.hibernate.Session interface provides methods to insert, update and delete the object. 

It also provides factory methods for Transaction, Query and Criteria.

Transaction

The transaction object specifies the atomic unit of work. It is optional. 

The org.hibernate.Transaction interface provides methods for transaction management.

ConnectionProvider

It is a factory of JDBC connections. 

It abstracts the application from DriverManager or DataSource. It is optional.

TransactionFactory

It is a factory of Transaction. It is optional.