mysql sql語句有變量 time_t變量轉換爲string

1.char*變量 如果有兩個指針變量不可以 需要一個轉換爲string

     string strCall ;
    strCall.assign(pCallInfo->m_szCallerNo,strlen(pCallInfo->m_szCallerNo));//char* 轉換爲string
    string sql = "insert into tcallrecord values('"+strCall+"','"+pCallInfo->m_szCalleeNo+"')";

2.time_t類型轉換爲Cstring string

   time_t  currtime;

    tm *ptime ;
    time(&(currtime));
    tzset();
    ptime = localtime(&(currtime));
    asctime(ptime);
    CString strBT;
    strBT.Format("%d:%d:%d",ptime->tm_hour,ptime->tm_min,ptime->tm_sec);
    string conntime = strBT.GetBuffer();