提高MySQL 查询效率的三个技巧第1/2页

                     if(m_Row[3] != NULL)
                            hostcache[i].externalIP   = atoi(m_Row[3]);
                     if(m_Row[4] != NULL)
                            hostcache[i].externalPort = atoi(m_Row[4]);
                     if(m_Row[5] != NULL)
                            hostcache[i].internalIP   = atoi(m_Row[5]);
                     if(m_Row[6] != NULL)
                            hostcache[i].internalPort = atoi(m_Row[6]);              
              }
       }
       else
       {
              //随机的挑选指定条记录返回
              int iRemainder = iAllNumRows%iReturnNumRows;    ///<余数
              int iQuotient = iAllNumRows/iReturnNumRows;      ///<商
              int iStartIndex = rand()%(iRemainder + 1);         ///<开始下标  
              //获取逐条记录
        for(int iSelectedIndex = 0; iSelectedIndex < iReturnNumRows; iSelectedIndex++)
        {
                            mysql_data_seek(m_pResultSet, iStartIndex + iQuotient * iSelectedIndex);