In Hibernate Architecture is layered with many object like as transaction factory, session ,session factory ,persistence Object transaction. let's see bellow diagram describe some basic hibernate functionality.
1. Configuration (org.hibenrate.cfg.Configuration): In this section represent a configuration or properties file for Hibernate.The configuration object created once when application initialization.The configuration object read and make the connection to relational database.
The Configuration object provides two keys factor:
2. Session-Factory (org.hibernate.SessionFactory): The Session-Factory is thread-safe as it is created one per database and can be concurrently accessed by multiple threads and created at time of application startup. Session-Factory created using Configuration object.
session-factory can hold an optional (Second level)cache of data that is reusable between transaction at process ,cluster level.
3. Session (org.hibernate.Session) :The Session is used to create object that are used to communicate between java application and persistence store database.This is factory for transaction and it is not thread-safe.Session holds a mandatory first-level cache of persistence object.
4. Transaction (org.hibernate.Transaction) :
Transaction is not thread safe and it is associated with a session and it usually instantiated by call to Session.beginTransaction().
5. Query (org.hibernate.Query):Query Object use SQL or Hibernate Query Language(HQL) string to retrive data from the database and create object.Query instance is obtained by call Session.createQuery().
6. Criteria (org.hibernate.Criteria): Criteria Object are used to create and execute object oriented criteria query to retrieve object.
1. Configuration (org.hibenrate.cfg.Configuration): In this section represent a configuration or properties file for Hibernate.The configuration object created once when application initialization.The configuration object read and make the connection to relational database.
The Configuration object provides two keys factor:
- Database Connection:This is handled through one or more configuration files support Hibernate.The name of these file are hibernate.properties and hibernate.cfg.xml.
- Class Mapping Setup: this component create the connection between java class and relation database tables.
2. Session-Factory (org.hibernate.SessionFactory): The Session-Factory is thread-safe as it is created one per database and can be concurrently accessed by multiple threads and created at time of application startup. Session-Factory created using Configuration object.
session-factory can hold an optional (Second level)cache of data that is reusable between transaction at process ,cluster level.
3. Session (org.hibernate.Session) :The Session is used to create object that are used to communicate between java application and persistence store database.This is factory for transaction and it is not thread-safe.Session holds a mandatory first-level cache of persistence object.
4. Transaction (org.hibernate.Transaction) :
Transaction is not thread safe and it is associated with a session and it usually instantiated by call to Session.beginTransaction().
5. Query (org.hibernate.Query):Query Object use SQL or Hibernate Query Language(HQL) string to retrive data from the database and create object.Query instance is obtained by call Session.createQuery().
6. Criteria (org.hibernate.Criteria): Criteria Object are used to create and execute object oriented criteria query to retrieve object.
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