Table of Contents

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  1. Preface
  2. Introduction to Transformations
  3. Transformation Ports
  4. Transformation Caches
  5. Address Validator Transformation
  6. Aggregator Transformation
  7. Association Transformation
  8. Bad Record Exception Transformation
  9. Case Converter Transformation
  10. Classifier Transformation
  11. Comparison Transformation
  12. Consolidation Transformation
  13. Data Masking Transformation
  14. Data Processor Transformation
  15. Decision Transformation
  16. Duplicate Record Exception Transformation
  17. Expression Transformation
  18. Filter Transformation
  19. Hierarchical to Relational Transformation
  20. Java Transformation
  21. Java Transformation API Reference
  22. Java Expressions
  23. Joiner Transformation
  24. Key Generator Transformation
  25. Labeler Transformation
  26. Lookup Transformation
  27. Lookup Caches
  28. Dynamic Lookup Cache
  29. Match Transformation
  30. Match Transformations in Field Analysis
  31. Match Transformations in Identity Analysis
  32. Normalizer Transformation
  33. Merge Transformation
  34. Parser Transformation
  35. Python Transformation
  36. Rank Transformation
  37. Read Transformation
  38. Relational to Hierarchical Transformation
  39. REST Web Service Consumer Transformation
  40. Router Transformation
  41. Sequence Generator Transformation
  42. Sorter Transformation
  43. SQL Transformation
  44. Standardizer Transformation
  45. Union Transformation
  46. Update Strategy Transformation
  47. Web Service Consumer Transformation
  48. Parsing Web Service SOAP Messages
  49. Generating Web Service SOAP Messages
  50. Weighted Average Transformation
  51. Window Transformation
  52. Write Transformation
  53. Appendix A: Transformation Delimiters

Developer Transformation Guide

Developer Transformation Guide

Dynamic Expressions

Dynamic Expressions

When you configure an expression in a dynamic output port, the expression becomes a dynamic expression. A dynamic expression can generate multiple output ports.
You can reference a port selector or a dynamic port in a dynamic expression. When the port selector or dynamic port contains multiple ports, the dynamic expression runs against each port.
When you configure a dynamic expression, the Developer tool does not validate if the generated ports are valid types for the expression. For example, if you reference a port selector that contains decimal type ports in an expression that requires string types, the expression appears as valid at design time.

Example

An Expression transformation has the following generated input ports:
EMPNO Decimal NAME String SALARY Decimal DEPTNO Decimal
The transformation contains a dynamic output port called MyDynamicPort. The output port returns the results of a dynamic expression. The dynamic expression multiplies the value of each port in a port selector by 100. The expression runs one time for each port in the port selector. Each instance can return a different result. The Expression transformation generates a separate output port for each result.
The Decimal_Selector port selector has a selection rule that includes the ports that are of decimal data type:
EMPNO Decimal SALARY Decimal DEPTNO Decimal
The following image shows a dynamic expression that references the Decimal_Selector port selector:
The Dynamic Expression dialog box has a tab for Functions, Ports, Parameters, Port Selectors. An expression is in the editor. The expression says Decimal_Selector *100.
Edit the output port settings to change output port names and output port properties. You can also choose the base port.

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