Spring Data JPA基本知识

1. Spring Data JPA是什么东东？

  Hibernate is the most common JPA Provider.

• Spring Data JPA provides support for creating JPA repositories by extending the Spring Data repository interfaces.
• Spring Data Commons provides the infrastructure that is shared by the datastore specific Spring Data projects.
• The JPA Provider implements the Java Persistence API (JPA).

The repository hierarchy looks as follows:

JPA is an specification while Hibernate is a particular implementation of that specification (these implementations are usually referred to as Providers). 

• Spring Data JPA is not a JPA provider. It simply “hides” the Java Persistence API (and the JPA provider) behind its repository abstraction.
• Spring Data provides multiple repository interfaces that are used for different purposes.

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