From the course: Java Persistence with JPA and Hibernate

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Using composite keys on an entity

Using composite keys on an entity

From the course: Java Persistence with JPA and Hibernate

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Using composite keys on an entity

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- In an earlier video, you saw how to define the primary key of an entity. But the primary key was defined based on a single field of the entity. In the database, the primary key was a single column of the table, like the book_id in the book table. There could be times where your database table has a primary key composed of more than one column, because using a single column, a record cannot be made unique. This is known as a composite key or a composed primary key. How is it possible to define such a primary key in the application or in other words, in your entity class? I'm in the 05_05 E branch to show you through the steps, but if you'd like to follow along, I've created an empty branch 05_05 B for you. Before you start, you also need to run the MariaDB-init.sql script if you haven't done so. And MariaDB-05_05.sql script that can be found in the 05_05 B branch. So I'm going to run this one MariaDB-05_05.sql script.…

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