📘 Hibernate-Mappings Examples with Spring Data JPA

This project demonstrates core JPA Entity Relationships such as:

• @OneToOne
• @ManyToOne
• @OneToMany
• @ManyToMany

🗃️ Database Setup

No external relational database setup is required.

• Uses H2 in-memory database (lightweight ~2MB footprint)
• Fully supports both JDBC and R2DBC access
• Ideal for rapid prototyping, unit testing, and learning purposes

H2 Console

📌 Setup

You can insert sample data into various JPA entity relationships using the following API endpoints. Sample JSON payloads are available here.

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🔗 API Endpoints

• POST /api/emp/create Inserts data into a @OneToOne relationship.

• POST /api/tchr/create Insert data into @OneToMany relationship.

  👉 Data is automatically populated at startup using a CommandLineRunner.

• POST /api/movie/create Inserts data into a @ManyToMany relationship.

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🚀 Application Info

• The application starts on port 8082 by default.
• You can change the port configuration in application.properties.

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Libraries used

• Spring Boot
• Spring Data JPA with Hibernate
• H2

Tools used

• Git 2.24.0
• IntelliJ IDEA 2021.1.1.1
• Gradle