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English
  • Common Content for Data Engineering 10.4.1
  • All Products

Table of Contents

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  1. Preface
  2. Mappings
  3. Mapplets
  4. Mapping Parameters
  5. Where to Assign Parameters
  6. Mapping Outputs
  7. Generate a Mapping from an SQL Query
  8. Dynamic Mappings
  9. How to Develop and Run a Dynamic Mapping
  10. Dynamic Mapping Use Cases
  11. Mapping Administration
  12. Export to PowerCenter
  13. Import From PowerCenter
  14. Performance Tuning
  15. Pushdown Optimization
  16. Partitioned Mappings
  17. Developer Tool Naming Conventions

Developer Mapping Guide

Developer Mapping Guide

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Step 3. Configure the Expression Transformation

Step 3. Configure the Expression Transformation

In the Expression transformation, configure the expression to aggregate for each row that the mapping processes.
  1. Select the Expression transformation in the mapping editor to view the transformation properties.
  2. Open the
    Mapping Outputs
     view.
  3. Create a mapping outputs expression.
    The Developer tool creates an output expression with an output name that matches one of the mapping outputs you created at the mapping level. If you have more than one mapping output in the mapping properties, select the appropriate mapping output name to use.
  4. Click the
    Expression
     column to enter an expression in the
    Expression Editor
    .
    The expression can contain just a port name or it can contain functions, ports, and parameters. If the expression contains parameters, the parameter values can be set in a parameter file or parameter set.
  5. Click
    Validate
     to verify that the expression is valid.
  6. Click
    OK
     to save the expression.
    The expression appears in the
    Expression
     column for the mapping output expression.
  7. Click
    File
    Save
     to save the Expression transformation.
The following image shows the saved mapping output expression. The expression uses only the port 'ID' to calculate the mapping output. The Mapping Outputs view shows the configured output expression. For the mapping output Output_ID, the output expression is 'ID'.
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