Topics
1. Introduction to Hibernate Architecture
There are 4 basic layers in hibernate architecture i.e.1. Java application layer
2. Backend layer
3. Hibernate framework layer
4. Database layer
The Hibernate framework contains following levels:
Java Application:
The java application uses the hibernate framework .
Persitent Class Object:
Hibernate provides transparent persistence for Plain Old Java Objects (POJOs). The only strict requirement for a persistent class is a no-argument constructor.
SessionFactory:
SessionFactory is actualy an interface that extends Referenceable and Serializable.
The org.hibernate.SessionFactory interface provides factory method to get the object of Session.
An application usually has a single SessionFactory.
The Configuration class can be used to create SessionFactory object which serves as a factory class that creates Session objects.
It holds second level cache of data.
Session:
The org.hibernate.Session interface provides methods to insert, update and delete the object.
A Session is used to get a physical connection with a database.
The Session object is lightweight and designed to be instantiated each time an interaction is needed with the database. Persistent objects are saved and retrieved through a the Session object.
It is factory of Transaction, Query and Criteria. It holds a first-level cache (mandatory) of data.
Transaction:
The org.hibernate.Transaction interface provides methods for transaction management.
A transaction represents a unit of work. If you want the database to do some work for you, then we need to start a transaction.
ConnectionProvider:
It is a factory of JDBC connections ie provide the connection between jdbc and database. It abstracts the application from DriverManager or DataSource.
1. Introduction to Hibernate Architecture
There are 4 basic layers in hibernate architecture i.e.1. Java application layer
2. Backend layer
3. Hibernate framework layer
4. Database layer
The Hibernate framework contains following levels:
Java Application:
The java application uses the hibernate framework .
Persitent Class Object:
Hibernate provides transparent persistence for Plain Old Java Objects (POJOs). The only strict requirement for a persistent class is a no-argument constructor.
SessionFactory:
SessionFactory is actualy an interface that extends Referenceable and Serializable.
The org.hibernate.SessionFactory interface provides factory method to get the object of Session.
An application usually has a single SessionFactory.
The Configuration class can be used to create SessionFactory object which serves as a factory class that creates Session objects.
It holds second level cache of data.
Session:
The org.hibernate.Session interface provides methods to insert, update and delete the object.
A Session is used to get a physical connection with a database.
The Session object is lightweight and designed to be instantiated each time an interaction is needed with the database. Persistent objects are saved and retrieved through a the Session object.
It is factory of Transaction, Query and Criteria. It holds a first-level cache (mandatory) of data.
Transaction:
The org.hibernate.Transaction interface provides methods for transaction management.
A transaction represents a unit of work. If you want the database to do some work for you, then we need to start a transaction.
ConnectionProvider:
It is a factory of JDBC connections ie provide the connection between jdbc and database. It abstracts the application from DriverManager or DataSource.
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