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

Lookup Transformation Overview

Lookup Transformation Overview

The Lookup transformation is a passive or active transformation that looks up data in a flat file, logical data object, reference table, or relational table. The Lookup transformation can return one row or multiple rows from a lookup.
Before you create a Lookup transformation, create the lookup source. Import a flat file or relational database table as a physical data object. Or, create a logical data object or reference table to use as a lookup source. When you create a Lookup transformation, the Developer tool adds the columns from the data object or reference table as lookup ports in the transformation. After you create the transformation, configure one or more output ports to return the lookup results. Configure the lookup conditions and configure other lookup properties.
When you run a mapping or preview data, the Integration Service queries the lookup source. The Integration Service queries the lookup source based on the lookup ports in the transformation, the lookup properties, and the lookup condition. The Lookup transformation returns the result of the lookup to the target or another transformation.
You can configure a connected or unconnected Lookup transformation. A connected transformation connects to another transformation in the mapping. An unconnected transformation receives input from a :LKP expression in another transformation. If the Lookup transformation performs a lookup on a logical data object, you must configure a connected Lookup transformation. Connect the Lookup transformation input ports to an upstream transformation or to an upstream source. Connect the output ports to a downstream transformation or to a downstream target.
You can use multiple Lookup transformations in a mapping.
You can perform the following tasks with a Lookup transformation:
  • Get a related value. Retrieve a value from the lookup source based on a value in the input data. For example, the input data contains an employee ID. Retrieve the employee name from the lookup source by employee ID.
  • Retrieve multiple rows from a lookup source.
  • Perform a calculation. Retrieve a value from a lookup table and use the value in a calculation. For example, retrieve a sales tax percentage, calculate a tax, and return the tax to a target.
  • Perform an unconnected lookup with a :LKP expression in a transformation that accepts expressions. Filter the results with another expression in the transformation.
  • Parameterize the lookup source and the lookup condition to use a Lookup transformation in a dynamic mapping.

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