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  • PowerCenter 10.2
  • All Products

Table of Contents

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  1. Preface
  2. Using the Designer
  3. Working with Sources
  4. Working with Flat Files
  5. Working with Targets
  6. Mappings
  7. Mapplets
  8. Mapping Parameters and Variables
  9. Working with User-Defined Functions
  10. Using the Debugger
  11. Viewing Data Lineage
  12. Comparing Objects
  13. Managing Business Components
  14. Creating Cubes and Dimensions
  15. Using the Mapping Wizards
  16. Appendix A: Datatype Reference
  17. Appendix B: Configure the Web Browser

Designer Guide

Designer Guide

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Mapping Parameters and Variables Overview

Mapping Parameters and Variables Overview

In the Designer, use mapping parameters and variables to make mappings more flexible. Mapping parameters and variables represent values in mappings and mapplets.
If you declare mapping parameters and variables in a mapping, you can reuse a mapping by altering the parameter or variable values of the mapping in the session. Reuse a mapping to reduce the overhead of creating multiple mappings when only certain attributes of a mapping need to be changed.
When you use a mapping parameter or variable in a mapping, you first declare the mapping parameter or variable for use in each mapplet or mapping. Then, you define a value for the mapping parameter or variable before you run the session.
You can declare mapping parameters with the same name for use in a mapplet and a mapping. If the mapping parameter in a mapplet does not have a value, the parameter takes the value of the mapping parameter with the same name in the mapping.
Use mapping parameters and variables in a mapping to incrementally extract data. Use mapping parameters or variables in the source filter of a Source Qualifier transformation to determine the beginning time stamp and end time stamp for incrementally extracting data.
For example, you can create a user-defined mapping variable $$LastUpdateDateTime to save the time stamp of the last row that the Integration Service read in the previous session. In the source filter, use $$LastUpdateDateTime for the beginning time stamp and the built-in variable $$$SessStartTime for the end time stamp. Use the following filter to incrementally extract data based on the SALES.sales_datetime column in the source: 
SALES.sales_datetime > TO_DATE (‘$$LastUpdateDateTime’) AND SALES.sales_datetime < TO_DATE (‘$$$SessStartTime’)
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