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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. Macro Transformation
  30. Match Transformation
  31. Match Transformations in Field Analysis
  32. Match Transformations in Identity Analysis
  33. Normalizer Transformation
  34. Merge Transformation
  35. Parser Transformation
  36. Python Transformation
  37. Rank Transformation
  38. Read Transformation
  39. Relational to Hierarchical Transformation
  40. REST Web Service Consumer Transformation
  41. Router Transformation
  42. Sequence Generator Transformation
  43. Sorter Transformation
  44. SQL Transformation
  45. Standardizer Transformation
  46. Union Transformation
  47. Update Strategy Transformation
  48. Web Service Consumer Transformation
  49. Parsing Web Service SOAP Messages
  50. Generating Web Service SOAP Messages
  51. Weighted Average Transformation
  52. Window Transformation
  53. Write Transformation
  54. Appendix A: Transformation Delimiters

Developer Transformation Guide

Developer Transformation Guide

Back Next

Parameterize the Lookup Condition

Parameterize the Lookup Condition

You can configure an expression parameter that defines the lookup condition. An expression parameter contains a complete expression that you create in an expression editor. You can define a mapping parameter to override the expression parameter at run time.
If you specify a lookup condition using a parameter, you can browse for an expression parameter or you can create a parameter.
The following image shows where to configure an expression parameter for the Lookup condition:
The Lookup tab has the Specify by Parameter option selected. A parameter is selected called NewExpressionParameter2. The default value is CustomerID_IN = C_CUSTKEY.
To create a parameter, click
New
. Define a name for the parameter and edit the default value. The expression parameter default value is the full expression to define the lookup condition. You can use generated ports, dynamic ports, and port selectors in the expression.
When you create the expression, the lookup column is always the first value and the input column is the second value.
For example, you create the following lookup condition in an expression parameter:
CustomerID_IN = C_CUSTKEY
CustomerID_IN
 is the lookup column.
C_CUSTKEY
 is the input column.
The following image shows the lookup expression in the expression editor:
The Expression dialog box has ports and port selectors to choose from in the left panel. Configure the expression in the right panel.
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