P37練習(xí)，歡迎大家互相學(xué)習(xí)討論一下

public Result queryList() {
    List<ShopType> typeList = new ArrayList<>();
    // 1.從Redis中獲取列表數(shù)據(jù)
    List<String> typeListStr = stringRedisTemplate.opsForList().range(CACHE_TYPE_LIST, 0, -1);
    // 2.判斷是否存在
    if (!typeListStr.isEmpty()) {
        // 3.如果存在，則直接返回
        for (String str : typeListStr) {
            typeList.add(JSONUtil.toBean(str, ShopType.class));
        }
        return Result.ok(typeList);
    }
    // 4.如果不存在，從數(shù)據(jù)庫查詢
    LambdaQueryWrapper<ShopType> lambdaQueryWrapper = new LambdaQueryWrapper<>();
    typeList = list(lambdaQueryWrapper);
    // 5.如果不存在，返回錯(cuò)誤信息
    if (typeList.isEmpty()) {
        return Result.fail("不存在類型");
    }
    // 6.將數(shù)據(jù)存入Redis中
    for (ShopType shopType : typeList) {
        typeListStr.add(JSONUtil.toJsonStr(shopType));
    }
    stringRedisTemplate.opsForList().leftPushAll(CACHE_TYPE_LIST, typeListStr);
    // 7.返回
    return Result.ok(typeList);
}