@SpringBootApplication

@EnableCaching

public class GatheringApplication {

    public static void main(String[] args) {

        SpringApplication.run(GatheringApplication.class, args);

    }

}

    /**

     * 根据ID查询实体

     * @param id

     * @return

     */

    @Cacheable(value = "gathering",key = "#id")

    public Gathering findById(String id) {

        System.out.println("查询次数："+i++);

        return gatheringDao.findById(id).get();

    }

/**

     * 修改

     * @param gathering

     */

    @CacheEvict(value = "gathering",key = "#gathering.id")

    public void update(Gathering gathering) {

        gatheringDao.save(gathering);

    }

    /**

     * 删除

     * @param id

     */

    @CacheEvict(value = "gathering",key = "#id")

    public void deleteById(String id) {

        gatheringDao.deleteById(id);

    }

1、点击了5次查询，只有一次进入了方法体并，访问了数据库。其余4次都是从缓存中取数据。

　　查询次数：1

　　Hibernate: select gathering0_.id as id1_0_0_, gathering0_.address as address2_0_0_ from tb_gathering gathering0_ where gathering0_.id=?

2、执行修改方法

　　　Hibernate: select gathering0_.id as id1_0_0_, gathering0_.address as address2_0_0_ from tb_gathering gathering0_ where gathering0_.id=?
　　　Hibernate: update tb_gathering set address=?, city=?, detail=?, endtime=?, enrolltime=?, where id=?

　3、再次查询（点击5次），因为执行 修改方法时，也删除了缓存，所以本次查询可以进入方法体，并交互数据库

　　　查询次数：2
　　　Hibernate: select gathering0_.id as id1_0_0_, gathering0_.address as address2_0_0_ from tb_gathering gathering0_ where gathering0_.id=?

　4、执行删除方法

　　　Hibernate: select gathering0_.id as id1_0_0_, gathering0_.address as address2_0_0_ from tb_gathering gathering0_ where gathering0_.id=?
　　　Hibernate: delete from tb_gathering where id=?

　5、再次查询（点击5次），因为执行 删除方法时，也删除了缓存，所以本次查询可以进入方法体，并交互数据库，但未查询出结果　

　　　查询次数：3
　　  Hibernate: select gathering0_.id as id1_0_0_, gathering0_.address as address2_0_0_ from tb_gathering gathering0_ where gathering0_.id=?