在上一節(jié)JPA操作基礎(chǔ)上修改

Cache緩存策略：使更少的操作數(shù)據(jù)庫，更快的返回?cái)?shù)據(jù)

1、引入cache依賴

<dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-cache</artifactId> </dependency>

2.主要是修改UserSerViceImpl服務(wù)層實(shí)現(xiàn)類

@Service @Transactional //事務(wù) public class UserServiceImpl implements UserService {@Autowiredprivate UserRepository userRepository;@Override@Cacheable(value = "user", key = "#id")public User findUserById(Integer id) {System.out.println("查詢用戶查詢數(shù)據(jù)庫");return userRepository.getOne(id);}@Override@Cacheable(value = "userListPage" , key = "#pageable") //key值可視化,每頁的key值是不同的public Page<User> findUserListPage(Pageable pageable) {System.out.println("分頁查詢數(shù)據(jù)庫");return userRepository.findAll(pageable);}@Override//@CacheEvict(value = "users",key = "#id") //清空緩存中以users和key值緩存策略緩存的對象@CacheEvict(value = "userListPage",allEntries = true) //清空所有緩存中以users緩存策略緩存的對象public void saveUser(User user) {userRepository.save(user);}/*注解Caching可以混合幾個注解*/@Override@Caching(evict = {@CacheEvict(cacheNames = "user",key = "#user.id"),@CacheEvict(cacheNames = "user2" ,key = "user2.id")})public void updateUser(User user) {}}

3.測試TsetController類

@Controller public class TestController {@Autowiredprivate UserService userService;@RequestMapping("/getUserById")public @ResponseBody User getUserById(){System.out.println(userService.findUserById(1527));System.out.println(userService.findUserById(1527));System.out.println(userService.findUserById(1528));return userService.findUserById(1527);} }

4.對啟動類添加緩存注解

@SpringBootApplication @EnableCaching //對緩存做配置 public class DemoApplication {public static void main(String[] args) {SpringApplication.run(DemoApplication.class, args);}}

5.進(jìn)行測試：

運(yùn)行結(jié)果：

第二次查詢數(shù)據(jù)庫是因?yàn)閕d不同沒有這個緩存，會去查詢數(shù)據(jù)庫的

?

轉(zhuǎn)載于:https://www.cnblogs.com/yanghe123/p/10963601.html

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