void CPaymentImpl::AddPayment(unsigned char nPSID, double fPayCount, double fPayAmt, const char *szPayNum)
{
    CPosClientDB* pDB = CDataBaseManager::getConnection();
    //一种支付方式只能使用一次
    PayInfo *pInfo = GetPayInfo(nPSID);
    if ( NULL != pInfo ) {
        pInfo->fPayCount += fPayCount;
        pInfo->fPayAmt += fPayAmt;
        pInfo->fPayActualCount += fPayCount;
        pInfo->fPayActualAmt += fPayAmt;
        if ( strlen(pInfo->szPayNum) > 0 ) {
            if(strstr(pInfo->szPayNum, szPayNum) == NULL
                && strlen(pInfo->szPayNum) + strlen(szPayNum) < sizeof(pInfo->szPayNum))
            {//重复的Num就不加了
                strcat(pInfo->szPayNum, ",");
                strcat(pInfo->szPayNum, szPayNum);
            }
        } else {
            strcpy(pInfo->szPayNum, szPayNum);
        }        
        this->UpdateTempPayment(pDB, nPSID);
    } else {
        PayInfo info;
        info.nSID = m_vecPay.size();
        info.fPayCount = fPayCount;
        info.fPayAmt = fPayAmt;
        info.fPayActualCount = fPayCount;
        info.fPayActualAmt = fPayAmt;
        info.nPSID = nPSID;
        if ( szPayNum != NULL ) {
            strcpy(info.szPayNum, szPayNum);
        }
        m_vecPay.push_back(info);
        pInfo = &m_vecPay[info.nSID];
        this->SaveTempPayment(pDB, nPSID);
    }    
    ReducePrecision(pInfo->fPayCount);
    ReducePrecision(pInfo->fPayAmt);
    ReducePrecision(pInfo->fPayActualCount);
    ReducePrecision(pInfo->fPayActualAmt);

    CDataBaseManager::closeConnection(pDB);
}
这段代码中就像注解的那样，有一些代码实现了“一种支付方式只能使用一次”的功能，现在实在找不到在哪里实现的，大哥大姐大爷大妈们请帮忙看看吧，我要取消这项限制，但是不知道这功能是在哪里实现的。。。谢谢各位了！