Hibernate is an object-relational mapping tool that allows Java objects to be mapped to database tables. It handles the conversion between Java objects and database rows. Hibernate sits between Java objects and a database, handling all persistence-related tasks without requiring any SQL or JDBC code to be written. It supports various databases and technologies and provides APIs for easily storing and accessing Java objects directly from a database. Configuring Hibernate involves setting up configuration files that specify the database connection and class mappings between Java objects and database tables. SessionFactory and Session objects are then used to connect to the database and perform CRUD operations on persistent objects.

1. What is Hibernate?

Hibernate is an Object-Relational Mapping(ORM) solution for
JAVA and it raised as an free chronic structure developed by Gavin
King in 2001. It is a powerful, top rated Object-Relational
Persistence and Query service for any Java Program.

Hibernate charts Java sessions to information source platforms
and from Java information kinds to SQL information kinds and
relieve the designer from 95% of typical information persistence
related development tasks.

Hibernate sits between traditional Java things and information
source server to handle everything in persisting those things based
on the appropriate O/R systems and styles.

2. Hibernate Advantages:

Hibernate manages applying Java sessions to
information source platforms using XML data files
and without writing any line of code.

Provides easy APIs for storing and accessing Java
things directly to and from the information source.

If there is change in Database or in any table then
the only need to modify XML information file
qualities.

Subjective away the unfamiliar SQL kinds and
provide us to deal with familiar Java Objects.

Hibernate does not require a software server to

3. Supported Databases:
Hibernate facilitates almost all the major RDBMS.
Following is list of few of the information source
engines reinforced by Hibernate.

HSQL Database Engine

DB2/NT

MySQL

PostgreSQL

FrontBase

Oracle

Microsoft SQL Server Database

4. Supported Technologies:
Hibernate facilitates a variety of other technological
innovation, including the following:

XDoclet Spring

J2EE

Eclipse plug-ins

Maven
Hibernate uses various existing Java APIs, like JDBC,
Java Deal API(JTA), and Java Labeling and
Directory Interface (JNDI). JDBC provides a
standard level of abstraction of performance found
in relational information source, allowing almost

5. Configuration Object:
The Settings item is the first Hibernate item you make in any Hibernate
application and usually designed only once during application
initialization. It symbolizes a configuration or qualities information file
required by the Hibernate. The Settings item provides two keys
components:
Database Connection: This is managed through one or more
configuration data files reinforced by Hibernate. These data files
are hibernate.properties and hibernate.cfg.xml.
Class Mapping Setup
This component creates the outcomes of the Java sessions and
information source platforms..

6. SessionFactory Object:

Configuration item is used to make a SessionFactory
item which then configures Hibernate for the
applying using the supplied configuration
information file and allows for a Session item to be
instantiated. The SessionFactory is a line safe item
and used by all the discussions of a software.

The SessionFactory is high quality item so usually it
is made during application start up and kept for later
use. You would need one SessionFactory item per
information source using a separate configuration
information file. So if you are using several
information source then you would have to make
several SessionFactory things.

7. Session Object:

A Session is used to get a physical experience with a
data source. The Session object is light and portable
and designed to be instantiated everytime an
connections is required with the data source.
Chronic things are stored and recovered through a
Session item.

The session things should not be kept open for a
long time because they are not usually line safe and
they should be designed and damaged them as
required.

8. Transaction Object:
A Deal symbolizes a device of work with the data source and most of the
RDBMS facilitates transaction performance. Dealings in Hibernate are
addressed by a transaction administrator and transaction (from JDBC
or JTA).
This is an optionally available item and Hibernate programs may
choose not to use this interface, instead handling transactions in
their own application rule.
Query Object:
Query things use SQL or Hibernate Query Language (HQL)
sequence to recover data from the data source and create
things. A Query example is used to combine query factors,
restrict the number of results came back by the query, last but
not least to perform the query.

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10. SessionFactory Object:

Configuration item is used to make a SessionFactory
item which then configures Hibernate for the
applying using the supplied configuration
information file and allows for a Session item to be
instantiated. The SessionFactory is a line safe item
and used by all the discussions of a software.

The SessionFactory is high quality item so usually it
is made during application start up and kept for later
use. You would need one SessionFactory item per
information source using a separate configuration
information file. So if you are using several
information source then you would have to make
several SessionFactory things.