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HB Setting Up
Before using Hibernate, you need to install it, configure it with a database (MySQL/PostgreSQL), and set up the required configuration files.
Installing Hibernate with Maven:
To install Hibernate in a Maven project, add the following dependencies in your pom.xml file:
Maven Dependencies
pom.xml
Configuring Hibernate with MySQL/PostgreSQL:
Hibernate requires a configuration file to connect to the database. You can configure it using:
✅ hibernate.cfg.xml (for Hibernate-based configuration)
Hibernate Configuration File: hibernate.cfg.xml
Example for MySQL:
Example for PostgreSQL:
Hibernate Properties & Annotations:
Hibernate provides annotations for defining entity mappings, relationships, and constraints.
Student.java
import jakarta.persistence.*;
@Entity // Marks this as a Hibernate Entity (table)
@Table(name = "students") // Specifies table name
public class Student {
@Id // Primary Key
@GeneratedValue(strategy = GenerationType.IDENTITY) // Auto-increment
private Long id;
@Column(name = "student_name", nullable = false)
private String name;
@Column(unique = true)
private String email;
// Constructors
public Student() {}
public Student(String name, String email) {
this.name = name;
this.email = email;
}
// Getters and Setters
public Long getId() { return id; }
public void setId(Long id) { this.id = id; }
public String getName() { return name; }
public void setName(String name) { this.name = name; }
public String getEmail() { return email; }
public void setEmail(String email) { this.email = email; }
}
Main.java
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.cfg.Configuration;
public class Main {
public static void main(String[] args) {
// Create and save Student object
Student student = new Student("John Doe", "john@example.com");
// Create Hibernate session
SessionFactory sessionFactory = new Configuration().configure("hibernate.cfg.xml").addAnnotatedClass(Student.class).buildSessionFactory();
Session session = sessionFactory.openSession();
// Start transaction
session.beginTransaction();
session.save(student);
// Commit transaction
session.getTransaction().commit();
// Close session
session.close();
sessionFactory.close();
System.out.println("Hibernate setup successful!");
}
}