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The goal of this project is to study the JPA relationships:one-to-one,one-to-many /many-to-one, andmany-to-many.

Onivangfr.github.io, I have compiled my Proof-of-Concepts (PoCs) and articles. You can easily search for the technology you are interested in by using the filter. Who knows, perhaps I have already implemented a PoC or written an article about what you are looking for.

• [Medium]Understanding Relationships in JPA: Introduction
• [Medium]Understanding Relationships in JPA: One-to-One with Simple Primary Key
• [Medium]Understanding Relationships in JPA: One-to-One with Shared Primary Key
• [Medium]Understanding Relationships in JPA: One-to-Many with Simple Primary Key
• [Medium]Understanding Relationships in JPA: One-to-Many with Composite Primary Key
• [Medium]Understanding Relationships in JPA: Many-to-Many with Simple Primary Key
• [Medium]Understanding Relationships in JPA: Many-to-Many with Simple Primary Key and Extra Column
• [Medium]Understanding Relationships in JPA: Many-to-Many with Composite Primary Key and Extra Column
• [Medium]Mastering JPA Relationships: Practical Examples of Bidirectional Associations

• Java 21 or higher;
• A containerization tool (e.g.,Docker,Podman, etc.)

In a terminal and inside thespring-data-jpa-relationships root folder, run the following command:

docker compose up -d

In a terminal and inside thespring-data-jpa-relationships root folder, run the command below:

./mvnw clean spring-boot:run

Once the application is running, you can access its Swagger website athttp://localhost:8080/swagger-ui.html.

• Postgres

  dockerexec -it postgres psql -U postgres -d jparelationshipsdb\d personsselect* from persons;

  Typeexit to exit

• To stop the application, go to the terminal where it is running and pressCtrl+C;
• To stop and remove docker compose containers, network and volumes, go to a terminal and, inside thespring-data-jpa-relationships root folder, run the following command:

  docker compose down -v

In a terminal and inside thespring-data-jpa-relationships root folder, run the following command:

./mvnw cleantest

[Medium]:Understanding Relationships in JPA: One-to-One with Simple Primary Key

[Medium]Understanding Relationships in JPA: One-to-One with Shared Primary Key

[Medium]Understanding Relationships in JPA: One-to-Many with Simple Primary Key

[Medium]Understanding Relationships in JPA: One-to-Many with Composite Primary Key

[Medium]Understanding Relationships in JPA: Many-to-Many with Simple Primary Key

[Medium]Understanding Relationships in JPA: Many-to-Many with Simple Primary Key and Extra Column

[Medium]Understanding Relationships in JPA: Many-to-Many with Composite Primary Key and Extra Column

One-to-One

• https://vladmihalcea.com/the-best-way-to-map-a-onetoone-relationship-with-jpa-and-hibernate
• https://www.callicoder.com/hibernate-spring-boot-jpa-one-to-one-mapping-example/

One-to-Many / Many-to-One

• https://vladmihalcea.com/the-best-way-to-map-a-onetomany-association-with-jpa-and-hibernate
• https://www.callicoder.com/hibernate-spring-boot-jpa-one-to-many-mapping-example/

Many-to-Many

• https://vladmihalcea.com/the-best-way-to-use-the-manytomany-annotation-with-jpa-and-hibernate
• https://www.callicoder.com/hibernate-spring-boot-jpa-many-to-many-mapping-example/