Sql 分页

string fids = "";
            for (int i = 0; i < fieldIDs.Length; i++)
            {
                if (!fieldIDs[i].Equals("")) { fids += "," + fieldIDs[i]; }
            }
            fids = (fids.Length > 1 ? fids.Substring(1) : "*");

string cmdText = @"SELECT ROW_NUMBER() OVER(ORDER BY UPLOADDT DESC) AS ROW_INDEX,
                                   " + fids + " FROM SURVEYINFO(NOLOCK)  WHERE 1=1";
            if (!string.IsNullOrEmpty(where_clause) && where_clause != "")
            {
                cmdText += " and " + where_clause;
            }
            if (!string.IsNullOrEmpty(orderby_clause) && orderby_clause != "")
            {
                cmdText += " " + orderby_clause;
            }
           
            int iStartPage = (iPageIndex * iPageSize) + 1;
            int iEndPage = (iPageIndex * iPageSize) + iPageSize;
            cmdText = string.Format(@"SELECT * FROM ({0}) T
                                WHERE T.ROW_INDEX BETWEEN {1} AND {2}", cmdText, iStartPage, iEndPage);

return SqlHelper.ExecuteDataset(ConnectionString, CommandType.Text, cmdText).Tables[0];