Introduction to Hibernate Framework in Java

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  • January 27, 2023
  • JAVA
Hibernate Framework in Java

Introduction to Hibernate Framework in Java

Hibernate is one of the frameworks of the java programming language. Hibernate is used to perform java applications and database connectivity. Hibernate is the best ORM framework in java. ORM stands for Object Relational Mapping. We can perform operations on the data like save data, fetch data, and modify data using some software and that software can be made using java, C#,php. And that language can use databases to perform operations on the database using connectors. We can write applications using objects. In programming language we have objects and in databases, we have tables to connect both objects and tables we need to write the SQL code and that SQL code can be written by ORM frameworks means this ORM simply mapped objects into tables.

 When we develop the software we need to work with data and that data can be variables or/and objects and we need to store that object’s data somewhere else for future purposes. And that somewhere else means in the database. To store that object’s data in the database we need to do some connectivity and we must know something about SQL we need to write that SQL code in the form of queries in the java application. But instead of writing that queries, we can directly save that object into the database without using any queries. This means we can directly convert objects into databases using ORM(Object Relation(table) Mapping). Means mapping/conversion of objects into tables.


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The class represents tables in the database. The object represents a row of tables. One row means one object. Instance variables represent columns of the table. This means we are trying to map objects of java into the tables of RDBMS, to perform that mapping we require some ORM tools and one of the ORM tools is Hibernate. Apart from hibernating, we have another tool which is iBatis, TopLink. So using the hibernate ORM tool we can directly save objects into the database by using the save(obj) method. To use a save() method we need to create a session object.  then say But before creating the object of the session we need to create a session. So we can create a session by using the session factory interface. And to create a session factory we need to load the details of the database like the connection URL (e.g mysql:\\localhost\\3306\sample), and username and password into the file, and that file is passed as an object to a session factory. This way we can save the object into db not only saving we can retrieve/fetch that data by using the get() method. If you want to become the best Java Training in Pune SevenMentor which is the top JAVA Course in Pune.

 We can use all concepts to implement the hibernate in our java application.


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What is Hibernate?

Hibernate is a java framework that is used for the development of java applications to interact with databases. Hibernate is an ORM(Object Relational Mapping) tool and it is a lightweight and open-source framework. Hibernate is a non-invasive type of framework, meaning it will not force the developer to extend/implements its classes and interfaces. Hibernate was invented by Gavin king in 2001. Any kind of application can be built by using the hibernate framework. 

 In the traditional way of connecting java applications with databases, we need to use JDBC API in the programming. But in that, we need to write lots of code and queries manually. We need to write DAO classes in that we need to save one by one objects in the fields of the table manually. 

 Now, in the case of hibernation, we don’t need to write code/queries manually. Hibernate will do the things for us. We just need to pass objects to the hibernate. SevenMentor provides real-time and placement-assisted Java Classes in Pune.


Need of Hibernate Framework

JDBC code is dependent upon the Database which we have used in our application i.e. our persistence logic is dependent upon the database, because of using JDBC. the queries of MySql won’t work if we change the database.

1. If working with JDBC, changing of Database in the middle of the project is very costly.

2. JDBC code is not portable code across multiple database software.

3. In JDBC, Exception handling is mandatory. We need to handle lots of exceptions in java jdbc

To overcome the above-mentioned problems we can use the ORM tool in our application i.e. nothing but Hibernate framework. By using Hibernate we can avoid all the above problems and we can enjoy some additional set of functionalities and features of hibernate.


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Implementation of Hibernate in  Eclipse

To implement this hibernate in eclipse we can create a normal project as well as we can create the maven project. When we implement hibernate we require some libraries to work with and we need to download those libraries and then need to add it to the current project. If we use a maven project then maven itself does that stuff for us. So let’s create a maven project.

 Eclipse -> new -> maven project-> next(direct)-> catalog(internal)->select maven.archtype.quickstart 1.1-> next

 Quickstart means we are making core java applications. Give group id e.g com. pooja. Then give Artifact id e.g DemoHibernate.Artifact id means project name.



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