Various Repository as an interface provided by Spring Data JPA

Various Repository Interface inheritance:

Repository :

public interface UserRepository  extends Repository<User, Integer> {
}

• The method of naming query:

findByNameLike(String name)
findByName(String name)
findByNameAndAge(String name, Integer age)
findByNameOrAddress(String name)
...

reference:

https://www.jianshu.com/p/1d6f27f675bb
https://www.jianshu.com/p/1d6f27f675bb

• Based @Query notes queries and updates

  1. @Query annotation-based queries

     • JPQL way

       @Query("form User WHERE name = ?1")
       List<User> findByName(String name);

       ps: JPQL placeholder 1 starting from the index.

     • SQL way

       @Query("select * from User WHERE name = ?1")
       List<User> findByName(String name);

  2. Based update @Query comment

     The need to increase @Modifying update @Query annotation-based

     • JPQL way

       @Query("Update User set name = ?1 WHERE id = ?2")
       @Modifying
       int updateNameAndId(String name, Integer id);

     • SQL way

       @Query("update user set name = ?1 WHERE id = ?2")
       @Modifying
       int updateNameAndId(String name, Integer id);

CrudReposiroty :

CrudRepository: 主要是进行增删改查的方法 

PagingAndSortingRepository :

PagingAndSortingRepository: 主要是进行排序或者分页

JPARepository

JPARepository: 主要对继承父接口中方法的返回值进行了适配,因为在父类接口中通常都返回迭代器，需要我们自己进行强制类型转化。而在JpaRepository中，直接返回了List

JpaSpecificationExecutor

JpaSpecificationExecutor: 主要提供了多条件查询的支持，并且可以在查询中添加分页和排序。 

to sum up :

Spring Data Jpa provided a total of

Repository：

• Support method named queries (provided findBy + attribute method)

• @Query

  HQL: nativeQuery default false

  　 SQL: nativeQuery default true

        更新的时候，需要配合@Modifying使用

CurdRepository:

Repository inherited mainly provides the data CRUD

PagingAndSortRepository:

Inherited CrudRepository provides paging and sorting of data, paging or only drawback is that all sorts of data, can not do conditional

JpaRepository：

Inherited interfaces PagingAndSortRepository, developers often used, mainly inherited PagingAndSortRepository, the return value type of did fit

JpaSpecificationExecutor

Providing multi-criteria query