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HIBERNATE

BY:NITINBANSAL

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What is Hibernate is a framework that provides tools for object-

relational mapping (ORM) library for the Java language, formapping an object -oriented domain model to atraditional relational database.

Hibernate solves object-relational impedancemismatch problems.

Hibernate's primary feature is mapping from Java classes todatabase tables.

We need to write a simple Java code and create an XMLmapping file that describes the relationship betweendatabase and class attributes.

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Application RDBMS

Used forstorage andretrieval

We have to store the data of Application in tables for multiple

use. But there is a mismatch in mapping object orientedprogramming and Relational Database.

Why HIBERNATE?

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Hibernate is introduced to overcome this mismatch.

It can be used to perform operations on the database likeselect, insert, update and delete the records in the tableautomatically and creates the query to perform these

operations.

Hibernate generates the SQL on the fly and thenautomatically executes the necessary SQL statements.

The main drawback of JDBC is that itdoesnt

allow to storeobjects directly to the database, we have to convert theobjects to a relational format.

Why HIBERNATE?

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Hibernat is highly configurable through two types ofconfiguration files.

The first type of configuration file isnamed hibernate.cfg.xml.

The second type of configuration file is a mapping

description file (file extension *.hbm)

HIBERNATE ARCHITECTURE

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Hibernate provides a query language HQL similar to thestandard SQL and is extremely powerful query language.

Hibernate automatically generates the SQL query andexecute it against underlying database if HQL is used in the

application.

Hibernate Query Language is extremely powerful and itsupports Polymorphism, Associations, Much less verbose thanSQL.

HQL uses Classes and properties instead of tables andcolumns.

HIBERNATE QUERY LANGUAGE

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Less Development Time

Database independence: Easy database switch withoutchanging any code.

Transparent Persistence: It is the automatic mapping of Javaobjects with database tables and vice versa using runtimereflection.

Lazy Loading: This feature enable us to get only the required

object instead of fetching all the entities associated withthat.

Hibernate provides Cache mechanism: It provides first levelcache (By Session object) and second level cache (By Sessionfactory object)

Features of HIBERNATE

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HIBERNATE Example

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Extensibility

Reliability and Scalability

Productivity

Maintainability Hibernate can work with Tomcat Application Server.

Lots of API to learn

Difficulty in Debugging

Slower than JDBC

ADVANTAGES

DISADVANTAGES

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