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

Default Values for Ports

Default Values for Ports

All transformations use default values that determine how the Integration Service handles input null values and output transformation errors.
Input, output, and input/output ports have a system default value that you can sometimes override with a user-defined default value. Default values have different functions in different types of ports:
  • Input port.
    The system default value for null input ports is NULL. The default value appears as a blank in the transformation. If an input value is NULL, the Integration Service leaves it as NULL.
  • Output port.
    The system default value for output transformation errors is ERROR. The default value appears in the transformation as ERROR(‘transformation error’). If a transformation error occurs, the Integration Service skips the row. The Integration Service notes all input rows that the ERROR function skips in the log file.
    The following errors are transformation errors:
    • Data conversion errors, such as passing a number to a date function.
    • Expression evaluation errors, such as dividing by zero.
    • Calls to an ERROR function.
  • Pass-through port.
    The system default value for null input is the same as input ports, NULL. The system default value appears as a blank in the transformation. The default value for output transformation errors is the same as output ports. The default value for output transformation errors does not display in the transformation.
The Java Transformation converts PowerCenter® datatypes to Java datatypes, based on the Java Transformation port type. Default values for null input differ based on the Java datatype.
The following table shows the system default values for ports in connected transformations:
Port Type
Default Value
Integration Service Behavior
User-Defined Default Value Supported
Input, Pass-through
NULL
Integration Service passes all input null values as NULL.
Input, Input/Output
Output, Pass-through
ERROR
Integration Service calls the ERROR function for output port transformation errors. The Integration Service skips rows with errors and writes the input data and the error message in the log file.
Output
Variable ports do not support default values. The Integration Service initializes variable ports according to the datatype.
You can override some of the default values to change the Integration Service behavior when it encounters null input values and output transformation errors.

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