/// <summary>
/// Converts query result rows into Row objects, and adds them to the collection.
/// </summary>
internal void AddRows(DatabaseQuery query, IEnumerable <object> rows)
{
if (query.Raw.OrderBy == null || query.Raw.OrderBy.Count == 0)
{
// We can access the enumerable in parallel, the order doesn't matter.
Rows.AddRange(rows.AsParallel().Select(
obj => CreateRowFromObservableCollection(obj)));
return;
}
// Access the enumerable in a series, because the order matters.
Rows.AddRange(rows.Select(obj => CreateRowFromObservableCollection(obj)));
}
/// <summary>
/// Converts query result rows into Row objects, and then executes the callback
/// with each row. This is intended to be used by code that wants to perform some
/// other aggregation over the returned query rows, to avoid the double enumeration
/// cost of converting to the Row format and then reading those back in a different
/// loop. This should be more efficient in that case because the data retrieval is
/// network bound, so we have CPU time to spare.
/// </summary>
internal void CallbackRows(DatabaseQuery query, IEnumerable <object> rows, Action <Row> callback)
{
if (query.Raw.OrderBy == null || query.Raw.OrderBy.Count == 0)
{
// We can fire callbacks in parallel, the order doesn't matter.
rows.AsParallel().ForAll(obj => callback(CreateRowFromObservableCollection(obj)));
return;
}
// Access the enumerable in a series, because the order matters.
foreach (object raw in rows)
{
callback(CreateRowFromObservableCollection(raw));
}
}
