Spring_Cache入门

注解

注解	说明
@EnableCaching	开启缓存注解功能，通常加在启动类上
@Cacheable	在方法执行前先查询缓存中是否有数据，如果有数据，则直接返回缓存数据; 如果缓存没有数据，调用方法并将返回值放入到缓存中
@CachePut	将方法的返回值放入到缓存中
@CacheEvict	将一条或多条数据从缓存中删除

案例

   @PostMapping
   // @CachePut(cacheNames = "userCache",key = "#result.id" ) 通过返回对象中的id作为key
   @CachePut(cacheNames = "userCache",key = "#user.id" )//redis的key值为userCache::user.id
   public User save(@RequestBody User user){
       userMapper.insert(user);
       return user;
   }
   @Cacheable(cacheNames = "userCache",key = "#id")//如果没数据后通过代理反射调用getById
   public User getById(Long id){
       User user = userMapper.getById(id);
       return user;
   }

   
   @DeleteMapping
   @CacheEvict(cacheNames = "userCache",key="#id")
   public void deleteById(Long id){
       userMapper.deleteById(id);
   }

@DeleteMapping("/delAll")
   @CacheEvict(cacheNames = "userCache",allEntries = true)//删除所有
   public void deleteAll(){
       userMapper.deleteAll();
   }