Hibernate ORM

A collection of practical Hibernate ORM examples demonstrating different types of entity relationships using Java, Hibernate, JPA, Maven, and MySQL.

📌 About

This repository contains hands-on implementations of Hibernate entity relationships. It focuses on understanding how Java objects are mapped to relational database tables using Hibernate ORM.

The repository includes three separate Maven projects:

• One-to-One Relationship
• One-to-Many Relationship
• Many-to-Many Relationship

Each project demonstrates entity mapping, relationships, database interaction, and CRUD operations.

📚 Topics Covered

🔹 One-to-One Relationship

Demonstrates a relationship where one entity is associated with exactly one instance of another entity.

Concepts:

• @OneToOne
• Entity Mapping
• Primary Key Mapping
• Hibernate Configuration
• CRUD Operations
• Object-Relational Mapping

🔹 One-to-Many Relationship

Demonstrates a relationship where one entity is associated with multiple instances of another entity.

Concepts:

• @OneToMany
• @ManyToOne
• Entity Relationships
• Foreign Key Mapping
• Hibernate Configuration
• CRUD Operations
• Object-Relational Mapping

🔹 Many-to-Many Relationship

Demonstrates a relationship where multiple instances of one entity can be associated with multiple instances of another entity.

Concepts:

• @ManyToMany
• Join Tables
• Foreign Key Relationships
• Entity Mapping
• Hibernate Configuration
• CRUD Operations
• Object-Relational Mapping

🛠️ Technologies Used

• Java
• Hibernate ORM
• JPA (Java Persistence API)
• Maven
• MySQL
• JDBC
• IntelliJ IDEA

📂 Project Structure

Hibernate/
│
├── Hibernate-One-to-One/
│   ├── src/
│   │   └── main/
│   │       └── java/
│   ├── pom.xml
│   └── ...
│
├── Hibernate-One-to-Many/
│   ├── src/
│   │   └── main/
│   │       └── java/
│   ├── pom.xml
│   └── ...
│
├── Hibernate-Many-to-Many/
│   ├── src/
│   │   └── main/
│   │       └── java/
│   ├── pom.xml
│   └── ...
│
└── README.md

⚙️ Setup and Installation

1. Clone the Repository

git clone https://github.com/shitalb11/Hibernate.git

2. Open the Project

Open the repository in IntelliJ IDEA or another Java IDE.

3. Configure MySQL

Create the required MySQL database and update the Hibernate configuration with your database details.

hibernate.connection.url=jdbc:mysql://localhost:3306/your_database
hibernate.connection.username=your_username
hibernate.connection.password=your_password

4. Build the Project

Each relationship is a separate Maven project. Navigate into the required project and run:

mvn clean install

5. Run the Application

Run the respective Java main class from the selected project.

🎯 Learning Objectives

This repository was created to practice and understand:

• Hibernate ORM fundamentals
• Entity and table mapping
• JPA annotations
• Entity relationships
• Primary and foreign keys
• Join tables
• CRUD operations
• Hibernate configuration
• Database connectivity
• Object-relational mapping

👩‍💻 Author

Shital Bhosale

GitHub: shitalb11

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⭐ If you find this repository useful, feel free to explore the projects and learn more about Hibernate ORM.