springdata JpaRepository 总结篇

迈不过友情╰ 2022-05-24 07:48 197阅读 0赞

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1、包含自定义几口、JpaRepository接口以及可扩展的JpaRepository的方法（findByName）

@Repository("jpaTestDao")

**publicinterface**JpaTestDao **extends**JpaRepository<T\_aVo,Integer>,JpaTestFactory\{

T\_aVofindByName(String name);

T\_aVofindById(String id);

2、springdatajpa 自带接口

3、自定义接口

**publicinterface**JpaTestFactory \{

**public** List<T\_aVo> getAlls();

4、自定义接口实现---------扩展（为了满足非全表查询的功能）

**publicclass**JpaTestDaoImpl **implements** JpaTestFactory\{

@PersistenceContext

**private**EntityManager em;

**public** List<T\_aVo>getAlls() \{

Stringsql= "select name from T\_aVo ";

QuerydataQuery= em.createQuery(sql);

Listdata= dataQuery.getResultList();

**returnnull**;

\};

总结：需要将自定义接口和springdata自带接口统一到同一个接口向外面提供服务（jpaTestDao供service使用）

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