// use ordinals to speed up access to DataReader // links: // crud definition: https://en.wikipedia.org/wiki/Create,_read,_update_and_delete // docLink: http://sql2x.org/documentationLink/327451c3-64a8-4de8-b359-76742d634497 // parameters: // reader: IDataReader from SQLClient public void Populate(IDataReader reader, DefaultStatisticsDataOrdinals ordinals) { if (!reader.IsDBNull(ordinals.ActivityDate)) { ActivityDate = reader.GetString(ordinals.ActivityDate); } if (!reader.IsDBNull(ordinals.DayCount)) { DayCount = reader.GetInt32(ordinals.DayCount); } }
/// <summary>Get default statistics</summary> /// <cardinality>Many</cardinality> public List <DefaultStatisticsData> DefaultStatistics() { var ret = new List <DefaultStatisticsData>(); string sql = @" select top 50 convert(nvarchar(30), date_time, 2) as activity_date ,count(*) as day_count from default_user_activity as ua group by convert(nvarchar(30), date_time, 2) order by convert(nvarchar(30), date_time, 2) desc "; // where 1=1 Logging log = Logging.PerformanceTimeStart("Default", "DataAccessLayer", "DefaultSearch", "DefaultStatistics"); try { using (var conn = new SqlConnection(Conn.ConnectionString)) { conn.Open(); conn.BeginTransaction(IsolationLevel.ReadUncommitted).Commit(); using (var command = new SqlCommand(sql, conn)) { log.PerformanceTimePrepare(command); IDataReader reader = command.ExecuteReader(CommandBehavior.SingleResult); log.PerformanceTimeCheck(); var ordinals = new DefaultStatisticsDataOrdinals(reader); while (reader.Read()) { var data = new DefaultStatisticsData(); data.Populate(reader, ordinals); ret.Add(data); } reader.Close(); } } } catch (Exception ex) { log.Error(ex); } return(ret); }