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int DataCache::getRanks(QID qid, const string &object, int typeRank, QUOTE_RECV_CALLBACK_PTR cb)
{
    lock_guard<mutex> lock(_dbmutex);
    try
    {
        soci::blob dv(_memory);
        _memory << (SELECT_RANKS), soci::use(object), soci::into(dv);

        if (auto ptr = cb.lock())
        {
            if (dv.get_len() > 0)
            {
                Dyna dd[10];
                dv.read(0, (char*)dd, dv.get_len());
                if (ptr)  // TODO why ptr changes empty?
                {
                    ptr->callback(qid, CB_Ranks, typeRank, &dd, dv.get_len());
                }
            }
        }
    }  // 释放 blob 类型的 dv 变量
    catch (soci::soci_error const &e)
    {
        LOGE(e.what());
        return -1;
    }

    return 0;
}