Spring Entity Manager和Spring Data Repository有什么区别? [英] What is the difference between an Spring Entity Manager and Spring Data Repository?

问题描述

我正在网站上使用JPA.在研究了用于保存数据的选项之后，我发现了两种方法.第一种方法是使用javax.persistence.EntityManager的实现.我使用LocalContainerEntityManagerFactoryBean实例化EntityManager的实例.一旦获得EntityManager的实例，就可以使用它来保存实体.例如，

I am using JPA in a website. After exploring about options for saving data, I found 2 approach. The first approach is using an implementation of javax.persistence.EntityManager. I used LocalContainerEntityManagerFactoryBean to instantiate an instance of EntityManager. Once I obtain an instance of an EntityManager, I can use it to save an entity. For example,

entityManager.merge(someEntity);

另一个选择是使用org.springframework.data.repository.CrudRepository的实例.一，我获得一个CrudRepository的实例，我可以用它来保存一个实体.例如，

Another option is to use an instance of org.springframework.data.repository.CrudRepository. One, I obtain an instance of a CrudRepository, I can use it to save an entity. For example,

aCrudRepository.save(someEntity);

使用EntityManager和CrudRepository将实体持久存储到数据库之间有什么区别?两种方法(实体管理器与Crud存储库)的优点或缺点是什么?

What is the difference between using an EntityManager and a CrudRepository to persist an entity into a database ? What are the benefit or disadvantage of the two approach (entity manager vs. crud repository) ?

推荐答案

这两个接口提供了两种不同的方法:

This two interfaces presents two different approaches:

• org.springframework.data.repository.CrudRepository是提供CRUD操作的存储库的通用接口.
• javax.persistence.EntityManager与持久性相关联 语境. Spring具有自己的接口，该接口扩展了CrudRepository 称为 .

• org.springframework.data.repository.CrudRepository is common interface for repositories which provide CRUD operations.
• javax.persistence.EntityManager is associated with a persistence context. Spring has its own interface which extends CrudRepository called JpaRepository for this purposes.

我希望您了解持久性API的优缺点.如果不这样做，您可以阅读

I hope you know about benefits or disadvantages of persistent API. If you don't you can read answers to this question.

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