Java Persistence with Hibernate

Introduction to Hibernate ORM

Hibernate is a powerful Object-Relational Mapping (ORM) framework for Java that simplifies database interaction. It bridges the gap between object-oriented programming and relational databases, allowing developers to work with Java objects and have them seamlessly persisted to the database.

Mapping Objects to Relational Databases

Hibernate uses annotations or XML configuration to map Java classes to database tables. This process is known as Object-Relational Mapping (ORM). By defining mappings, Hibernate takes care of generating SQL queries and managing database operations, relieving developers from writing boilerplate code.

import javax.persistence.*;

@Table(name = “employees”)
public class Employee {
@GeneratedValue(strategy = GenerationType.IDENTITY)
private Long id;

@Column(name = “full_name”)
private String fullName;

// Getters and setters

In this example, the Employee class is annotated with @Entity, indicating that it represents a database entity. The @Table annotation specifies the table name, and @Id and @GeneratedValue define the primary key and its generation strategy.

Performing CRUD Operations with Hibernate

Hibernate simplifies CRUD (Create, Read, Update, Delete) operations, making it easier to interact with the database.

public class EmployeeDAO {
private EntityManager entityManager;

public EmployeeDAO(EntityManager entityManager) {
this.entityManager = entityManager;

public Employee findById(Long id) {
return entityManager.find(Employee.class, id);

public void save(Employee employee) {

public void update(Employee employee) {

public void delete(Employee employee) {

In this example, we create a EmployeeDAO class responsible for CRUD operations. The EntityManager obtained from Hibernate’s session manages the transactions and database interactions.


Java Persistence with Hibernate empowers developers to manage database operations seamlessly without getting bogged down in SQL queries and database management. With Hibernate’s ORM capabilities, you can focus on your Java objects and let Hibernate take care of the rest. Embrace Hibernate in your Java projects, and you’ll experience a new level of efficiency and maintainability in your database interactions. Happy coding!

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