Add virtual methods to DataTransformerBase for GetBytes, GetChars,
GetData, and GetDataTypeName that properly handle computed columns
by throwing NotSupportedException when MapOrdinal returns -1.
Update TransformingDataReader to delegate these methods to the
transformer instead of directly to the source reader.
Add MapOrdinal method to the IDataTransformer interface and provide
a default implementation in DataTransformerBase. This enables
transformers to report the mapping between transformed ordinals and
source ordinals, supporting use cases like computed columns which
return -1 to indicate no source ordinal.
- Add MapOrdinal(int, IDataReader) to IDataTransformer interface
- Add virtual MapOrdinal implementation in DataTransformerBase
- Add DataTransformerBaseTests with test for default behavior
Add transformer that combines JDE Julian date (CYYDDD) and time (HHMMSS)
columns into a single DateTime column. Includes static ParseJdeDateTime
method for direct date conversion.
Add a data transformer that removes specified columns from the data stream.
Columns are matched by name (case-insensitive) and multiple columns can be
dropped in a single transformer. Includes comprehensive tests using NSubstitute
for mock IDataReader.
Add core transformer infrastructure for the ETL pipeline:
- DataTransformerBase: abstract base class with virtual methods for
field count, names, types, values, ordinals, and null checking
- TransformingDataReader: IDataReader wrapper that delegates to
transformer, enabling on-the-fly data transformations
Joseph Doherty