// 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);
}