public User[] Get(NpgsqlConnection connection, CriteriaType criteriaType, string name, int count)
{
IWhereOp whereOp;
bool asc;
switch (criteriaType)
{
case CriteriaType.DownFromInfinity:
whereOp = null;
asc = true;
break;
case CriteriaType.DownFrom:
whereOp = new Gt(DbStr.Name, name);
asc = true;
break;
case CriteriaType.DownFromOrEqual:
whereOp = new Ge(DbStr.Name, name);
asc = true;
break;
case CriteriaType.UpFromInfinity:
whereOp = null;
asc = false;
break;
case CriteriaType.UpFrom:
whereOp = new Lt(DbStr.Name, name);
asc = false;
break;
case CriteriaType.UpFromOrEqual:
whereOp = new Le(DbStr.Name, name);
asc = false;
break;
default:
throw new NotSupportedException("CriteriaType " + criteriaType);
}
var limit = Math.Min(count, MaxUsersToRetrieve);
var query = _npgQueryHelper.Select(
DbStr.Users, _userColumns, whereOp, new[] { DbStr.Name }, asc, limit);
var users = _npgHelper.ExecuteReader(connection, query, GetUser);
return asc ? users : users.Reverse().ToArray();
}
public LogItem[] GetItems(
NpgsqlConnection connection, CriteriaType criteriaType, DateTime criteria, int maxCount, bool includeBytes)
{
IWhereOp whereOp;
bool asc;
switch (criteriaType)
{
case CriteriaType.DownFromInfinity:
whereOp = null;
asc = false;
break;
case CriteriaType.DownFrom:
whereOp = new Lt(DbStr.Time, criteria.Ticks);
asc = false;
break;
case CriteriaType.DownFromOrEqual:
whereOp = new Le(DbStr.Time, criteria.Ticks);
asc = false;
break;
case CriteriaType.UpFromInfinity:
whereOp = null;
asc = true;
break;
case CriteriaType.UpFrom:
whereOp = new Gt(DbStr.Time, criteria.Ticks);
asc = true;
break;
case CriteriaType.UpFromOrEqual:
whereOp = new Ge(DbStr.Time, criteria.Ticks);
asc = true;
break;
default:
throw new NotSupportedException("CriteriaType " + criteriaType);
}
var columns = includeBytes ? _columns : _columnsWithoutBytes;
var query = _npgQueryHelper.Select(
_tableName, columns, whereOp, new[] { DbStr.Time }, asc, Math.Min(maxCount, MaxItemsToRetrieve));
var alarms = _npgHelper.ExecuteReader(connection, query, reader =>
{
var i = new LogItem
{
Time = reader.GetDateTimeFormTicks(0),
Text = reader.GetNullableString(1)
};
if (includeBytes)
{
i.Bytes = reader.GetByteArray(2);
}
return i;
});
return asc ? alarms.Reverse().ToArray() : alarms;
}
public Tuple<DateTime, double?[]>[] GetPage(int[] trendTagIds, CriteriaType criteriaType, DateTime criteria, int maxCount)
{
IWhereOp whereOp;
bool asc;
switch (criteriaType)
{
case CriteriaType.DownFromInfinity:
whereOp = null;
asc = false;
break;
case CriteriaType.DownFrom:
whereOp = new Lt(DbStr.Time, criteria.Ticks);
asc = false;
break;
case CriteriaType.DownFromOrEqual:
whereOp = new Le(DbStr.Time, criteria.Ticks);
asc = false;
break;
case CriteriaType.UpFromInfinity:
whereOp = null;
asc = true;
break;
case CriteriaType.UpFrom:
whereOp = new Gt(DbStr.Time, criteria.Ticks);
asc = true;
break;
case CriteriaType.UpFromOrEqual:
whereOp = new Ge(DbStr.Time, criteria.Ticks);
asc = true;
break;
default:
throw new NotSupportedException("CriteriaType " + criteriaType);
}
var columns = new List<string>(trendTagIds.Length + 1) { DbStr.Time };
columns.AddRange(trendTagIds.Select(GetColumnName));
var columnsArr = columns.ToArray();
var limit = Math.Min(maxCount, MaxSamplesToRetrieve);
var parameters = new List<NpgsqlParameter>();
var queryTexts = new List<string>();
for (var i = 0; i < TrendTableSelector.TablesCount; i++)
{
var queryText = _npgQueryHelper.Select(
parameters,
_tableName + "_" + i,
columnsArr,
whereOp,
ColumnsOfTime,
asc,
limit);
queryTexts.Add(queryText);
}
var query = _npgQueryHelper.Union(parameters, queryTexts, ColumnsOfTime, asc, limit);
var result = _npgHelper.ExecuteReader(_connection, query, reader =>
{
var time = reader.GetDateTimeFormTicks(0);
var values = new double?[columns.Count - 1];
for (var j = 1; j < columns.Count; j++)
{
values[j - 1] = reader.GetNullableDouble(j);
}
return new Tuple<DateTime, double?[]>(time, values);
});
return asc ? result.Reverse().ToArray() : result;
}