Table of Contents

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  1. Preface
  2. Working with Transformations
  3. Aggregator Transformation
  4. Custom Transformation
  5. Custom Transformation Functions
  6. Data Masking Transformation
  7. Data Masking Examples
  8. Expression Transformation
  9. External Procedure Transformation
  10. Filter Transformation
  11. HTTP Transformation
  12. Identity Resolution Transformation
  13. Java Transformation
  14. Java Transformation API Reference
  15. Java Expressions
  16. Java Transformation Example
  17. Joiner Transformation
  18. Lookup Transformation
  19. Lookup Caches
  20. Dynamic Lookup Cache
  21. Normalizer Transformation
  22. Rank Transformation
  23. Router Transformation
  24. Sequence Generator Transformation
  25. Sorter Transformation
  26. Source Qualifier Transformation
  27. SQL Transformation
  28. Using the SQL Transformation in a Mapping
  29. Stored Procedure Transformation
  30. Transaction Control Transformation
  31. Union Transformation
  32. Unstructured Data Transformation
  33. Update Strategy Transformation
  34. XML Transformations

Transformation Guide

Transformation Guide

COM Datatypes

COM Datatypes

When using either Visual C++ or Visual Basic to develop COM procedures, you need to use COM datatypes that correspond to the internal datatypes that the Integration Service uses when reading and transforming data. These datatype matches are important when the Integration Service attempts to map datatypes between ports in an External Procedure transformation and arguments (or return values) from the procedure the transformation calls.
The following table compares Visual C++ and transformation datatypes:
Visual C++ COM Datatype
Transformation Datatype
VT_I4
Integer
VT_UI4
Integer
VT_R8
Double
VT_BSTR
String
VT_DECIMAL
Decimal
VT_DATE
Date/Time
The following table compares Visual Basic and transformation datatypes:
Visual Basic COM Datatype
Transformation Datatype
Long
Integer
Double
Double
String
String
Decimal
Decimal
Date
Date/Time
If you do not correctly match datatypes, the Integration Service may attempt a conversion. For example, if you assign the Integer datatype to a port, but the datatype for the corresponding argument is BSTR, the Integration Service attempts to convert the Integer value to a BSTR.

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