May 2019
Intermediate to advanced
316 pages
7h 13m
English
Content preview from Hands-On Full Stack Development with Spring Boot 2 and React - Second Edition
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Chapter 3
- Object-relational mapping (ORM) is a technique that allows you to fetch and manipulate data from a database using an object-oriented programming paradigm. Java Persistence API (JPA) provides object-relational mapping for Java developers. Hibernate is a Java-based JPA implementation.
- The entity class is just a standard Java class that is annotated with the @Entity annotation. You have to implement constructors, fields, getters, and setters inside the class. The unique ID field(s) are annotated with the @Id annotation.
- You have to create a new interface that extends the Spring Data CrudRepository interface. You define the entity and the type of the id field in the type arguments—for example, <Car, Long>.
- CrudRepository provides ...
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