Java EE 8 Application Development

Summary

This chapter covered how to access data in a database via the Java Persistence API (JPA).

We covered how to mark a Java class as a JPA entity by decorating it with the @Entity annotation. Additionally, we covered how to map an entity to a database table via the @Table annotation. We also covered how to map entity fields to database columns via the @Column annotation, as well as declaring an entity's primary key via the @Id annotation.

Using the javax.persistence.EntityManager interface to find, persist, and update JPA entities was also covered.

Defining both unidirectional and bidirectional one-to-one, one-to-many, and many-to-many relationships between JPA entities was covered as well.

Additionally, we explored how to use JPA composite ...