This article is explaining you about the core concepts of Hibernate framework in Java. You can get the answer of the question "What is Hibernate in Java?".
What is Hibernate in Java? - Hibernate is ORM tool in Java.
Are you beginner in ORM framework in Java programming Language? Are you
looking for the information about the Hibernate ORM? Then this is the best place
to learn about Hibernate Framework in Java. The Hibernate in Java is framework
used for developing the data access layer in Java based applications. This
article gives you the complete information about Hibernate framework in Java.
There are many different databases such as Oracle, MySQL, MS SQL Server
etc... Developers are using JDBC to develop the code for database interaction
between application and the database. JDBC programming requires lot of work to
create SQL statement, execute the statement and then process the results. It is
the responsibility of the programmer to handle the exceptions occurred in
runtime. Exception handling is also a very big task and it requires a lot of
effort to write good code. To solve all these issues ORM tool was developed. The
ORM tool stands for Object Relational Mapping tool and it takes care to
generating the sql statements, executing the sql statement and finally
processing the result. It also handles the exceptions occurred in the program.
Hibernate is one of the ORM tool.
Features of ORM
Here are the features and benefits of ORM tools:
The ORM tool is great tool which is used to map the logical
business model (POJO class) with the relational database
The ORM tool is very useful in reducing the amount of
coding. ORM tools helps the developers to quickly develop the
data access layer. Developers mostly concentrate on the business
functions and uses the ORM tool for CRUD (Create, Read, Update
and Delete) operation.
Easy to adapt the changes in database structure. If you have
to change the database structure you just have to change the
definition of model class the ORM will automatically change the
SQL and Select queries. This eases the development and
maintenance of enterprise application very easily.
The ORM tools provides rich query language which based on
the domain model (POJO) class. Developers writes the query using
the domain model and the the ORM tool generates the SQL queries
automatically. So, programmer concentrates on the business login
and the ORM tool takes care of the persistence, retrieval and
query the database.
ORM tool support relationship amongst the objects.
It supports lazy loading and many other optimization
It also supports the concurrency.
It also supports primary and secondary level cache.
Transaction management also a very important feature of the
database. The ORM tools also supports transaction management and
What is Hibernate in Java?
The Hibernate is popular ORM tool developed in Java programming language and
it supports all the major Databases. You can switch to another database simply
dialect in the configuration file. The Hibernate framework is free software
distributed under GNU Lesser General Public License.
The Hibernate framework is Object Relational Mapping tool which is used by
the Java developers to map the Java objects to the relational database.
Hibernate is feature rich tool which is used to develop enterprise applications.
It can be used with Java SE application and web applications. It can
easily used with JSP, Servlets, Struts. Spring Web, JSF and other Java based we
application development frameworks.
Hibernate is also used with JPA as persistence provider. Hibernate also
supports primary-level and secondary-level caching. You can use any cache
Hibernate framework includes following components which makes it pluggable
and you can use the components you just need.
Hibernate Core: This is also know as
Hibernate ORM. Hibernate Core is the main component of the
Hibernate architecture. This components is responsible for
performing the CRUD operations.
Hibernate Annotations: This is merged with
Hibernate Core in the release of Hibernate version 3.6.
Hibernate Annotation is a way to provide the mapping metadata to
the Hibernate runtime.
Hibernate Entity Manager: The
HibernateEntity Manager provides the API for performing the CRUD
operations. Though HibernateEntity manager programmer interacts
with the database.
Hibernate Envers: Is and Easy Entity
Hibernate OGM: The OGM stands for
Object/Grid Mapper which is an extension to store data in a
Hibernate Shards: The Hibernate
Shards is used for horizontal partitioning for multiple
relational databases. Although Hibernate Shards is not fully
compatible with Hibernate 4.x. Check the compatibility in the
current release specs.
Hibernate Search: The Hibernate Search is
hibernate library to access the Apache Lucene full text engine
Hibernate Tools: It includes the
Eclipse plugins, Ant tasks etc...
Hibernate Validator: Used for validation in
the POJO class.