苍穹外卖--springCache-@Cacheable使用
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@@ -5,6 +5,7 @@ import com.inmind.mapper.UserMapper;
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import lombok.extern.slf4j.Slf4j;
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import org.springframework.beans.factory.annotation.Autowired;
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import org.springframework.cache.annotation.CachePut;
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import org.springframework.cache.annotation.Cacheable;
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import org.springframework.web.bind.annotation.*;
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@RestController
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@@ -44,7 +45,15 @@ public class UserController {
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userMapper.deleteAll();
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}
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/*
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需求:在根据id查询用户时,先从redis缓存中查找,如果没有从数据库中查询,并将查询到的数据放入redis中
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注意:Cacheable在方法体执行之前就要获取redis的key值,所以不能使用#result
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Cacheable底层原理:代理对象,如果能查询到缓存数据,直接就不调用原始方法,如果查询不到缓存,那就执行原始方法,查询数据,将查询到的数据保存到
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缓存中
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*/
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@GetMapping
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@Cacheable(cacheNames = "userCache",key = "#id")//key的生成 userCache::#id
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public User getById(Long id){
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User user = userMapper.getById(id);
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return user;
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