SpringBoot Cache operation

Modified on the basis of an operation JPA

Cache caching strategy : make fewer database operations, faster return data

1, cache dependency is introduced

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

2. The main layer is modified UserSerViceImpl service implementation class

@Service 
@Transactional   // transaction 
public  class UserServiceImpl the implements UserService { 

    @Autowired 
    Private UserRepository userRepository; 

    @Override 
    @Cacheable (value = "User", Key = "#id" )
     public the User findUserById (Integer ID) { 
        System.out.println ( "database query user query" );
         return userRepository.getOne (ID); 
    } 

    @Override 
    @Cacheable (value = "userListPage", key = "#pageable") // key value visualization, each page key value is different 
    public Page <the User>findUserListPage (the Pageable Pageable) { 
        System.out.println ( "Database Query Page" );
         return userRepository.findAll (Pageable); 
    } 
    @Override 
    // @CacheEvict (value = "Users", Key = "#id")   // users to empty cache caching policy and the key value of the cached object 
    @CacheEvict (value = "userListPage", = allEntries to true )   // Clear all cache caching policy to users cached object 
    public  void saveUser (the User User) { 
        userRepository.save (User); 
    } 

    / * 
        annotations Caching can mix several notes 
     * / 
    @Override 
    @Caching (The evict = {@CacheEvict (cacheNames = "User", Key = "#user.id"),
            @CacheEvict(cacheNames = "user2" ,key = "user2.id")})
    public void updateUser(User user) {

    }

}

3. Test TsetController class

@Controller
public class TestController {

    @Autowired
    private 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. Add the cache annotations to start class

@SpringBootApplication
@EnableCaching  //对缓存做配置
public class DemoApplication {

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

}

5. Test:

operation result:

The second query the database is no different because the cache id will be to query the database