spring-boot中使用缓存cache

1.启动类中开启缓存

@SpringBootApplication
@EnableCaching //开启缓存
public class Demo1Application {

    public static void main(String[] args) {
        SpringApplication.run(Demo1Application.class, args);
    }

}

2.服务层定义缓存表示@CacheConfig

@CacheConfig(cacheNames = "user")表示此服务层缓存都为“user”命名

@Service
@CacheConfig(cacheNames = "user")
public class UserServiceImpl extends ServiceImpl<UserMapper, User> implements UserService {

    @Resource
    private UserMapper userMapper;

3.数据缓存@Cacheable

缓存默认key值是参数id值

    @Override
    @Cacheable
    public User getUserById(String id) {
        System.out.println("####################################:"+id);
        return userMapper.selectById(id);
    }

3.缓存的更新@CachePut

key是更新后数据的id，更新的内容默认为返回的值

    @Override
    @CachePut(key = "#result.id")
    @Transactional
    public User updateUserById(User user) {
        userMapper.updateById(user);
        return userMapper.selectById(user.getId());
    }

4.清楚缓存@CacheEvict

缓存默认key值是参数id值。beforeInvocation =true 表示删除用户的方法执行前清楚缓存

    @Override
    @CacheEvict(beforeInvocation = true)
    public Integer DeleteUserById(String id) {
        return userMapper.deleteById(id);
    }