实现商铺查询缓存：

ShopTypeController类：

@RestController
@RequestMapping("/shop-type")
public class ShopTypeController {
          
   
    @Resource
    private IShopTypeService typeService;

    @GetMapping("list")
    public Result queryTypeList() {
          
   
//        List<ShopType> typeList = typeService
//                .query().orderByAsc("sort").list();
//        return Result.ok(typeList);
        return typeService.queryList();
    }
}

IShopTypeService接口：

public interface IShopTypeService extends IService<ShopType> {
          
   

    Result queryList();
}

ShopTypeServiceImpl类：

@Service
public class ShopTypeServiceImpl extends ServiceImpl<ShopTypeMapper, ShopType> implements IShopTypeService {
          
   

    @Resource
    private StringRedisTemplate stringRedisTemplate;

    @Override
    public Result queryList() {
          
   

        // 1.在redis中查询店铺类型缓存
        String key = SHOP_TYPE_KEY + "list";
        List<String> stringTypeList = stringRedisTemplate.opsForList().range(key, 0, -1);
        // 2.判断是否命中
        if (!stringTypeList.isEmpty()) {
          
   
            // 3.命中，直接返回
            // List<String>  ===> List<?>
            List<ShopType> shopTypeList = JSONUtil.toList(stringTypeList.toString(), ShopType.class);
            return Result.ok(shopTypeList);
        }

        // 4.没有命中，查询数据库
        List<ShopType> typeList = query().orderByAsc("sort").list();
        // 5.判断数据库中是否存在
        if (typeList == null) {
          
   
            // 6.不存在，返回错误信息
            return Result.fail("店铺类型不存在！");
        }

        // 7.存在，存入redis
        // List<?>  ===> List<String>
        stringTypeList = JSONUtil.toList(new JSONArray(typeList), String.class);
        stringRedisTemplate.opsForList().rightPushAll(key, stringTypeList);
        // 8.返回
        return Result.ok(typeList);
    }
}