曲线图获取数据

   public static DataTable GetPM25ChartsByYear(string year, string seqId)
        {
            string sql = @"SELECT MAX(EPAir1) AS [max],AVG(EPAir1) AS [avg],MIN(EPAir1) AS [min],DATEPART(MONTH,EPAddTime) AS [month] FROM dbo.BASE_EPRecord
                            WHERE DATEPART(YEAR,EPAddTime)='{0}' AND EPDevSeq='{1}'
                            GROUP BY DATEPART(MONTH,EPAddTime)
                            ORDER BY [month] ASC";

            return DbHelperSQL.GetDataTable(string.Format(sql, DateTime.Parse(year).Year, seqId));
        }

        public static DataTable GetPM25ChartsByMonth(string month, string seqId)
        {
            string sql = @"SELECT MAX(EPAir1) AS [max],AVG(EPAir1) AS [avg],MIN(EPAir1) AS [min],CAST(CONVERT(varchar(100), EPAddTime, 23) AS DATETIME) AS addTime FROM dbo.BASE_EPRecord
                            WHERE DATEPART(MONTH,EPAddTime)={0} AND DATEPART(YEAR,EPAddTime)='{1}' AND EPDevSeq='{2}'
                            GROUP BY CONVERT(varchar(100), EPAddTime, 23)
                            ORDER BY addTime ASC";

            return DbHelperSQL.GetDataTable(string.Format(sql, DateTime.Parse(month).Month, DateTime.Parse(month).Year, seqId));
        }

        public static DataTable GetPM25ChartsByDate(string date, string seqId)
        {
            string sql = @"SELECT MAX(EPAir1) AS [max],AVG(EPAir1) AS [avg],MIN(EPAir1) AS [min],CAST(CONVERT(varchar(100), EPAddTime, 23)+' '+CAST(DATEPART(hh,EPAddTime) AS VARCHAR(10))+':00:00' AS DATETIME) AS addTime FROM dbo.BASE_EPRecord
                        WHERE CONVERT(varchar(100), EPAddTime, 23)='{0}' AND EPDevSeq='{1}'
                        GROUP BY  CONVERT(varchar(100), EPAddTime, 23)+' '+CAST(DATEPART(hh,EPAddTime) AS VARCHAR(10))+':00:00'
                        ORDER BY addTime ASC";

            return DbHelperSQL.GetDataTable(string.Format(sql, date, seqId));
        }