When you define a mapping parameter, you can bind the mapping parameter to a transformation parameter. The mapping parameter value overrides the default parameter value in the transformation.

When you bind a mapping parameter to a transformation parameter, the parameters must be the same type. The mapping parameter name does not have to be the same as the transformation parameter name.

You can use a parameter set or a parameter file to set the mapping parameter values at run time. You cannot set reusable transformation, reusable mapplet, or reusable data source parameter values with a parameter set or parameter file. To change parameter values in reusable objects at run time, expose the parameter values as mapping parameters. Configure mapping parameters for the exposed values in the parameter set or parameter file.

Use one of the following methods to define mapping parameters:

Define mapping parameters on the

Parameters

tab of the mapping

Properties

view

On the mapping

Parameters

tab, you can manually enter each parameter name, the parameter attributes, and the default value. You can bind these parameters to transformation parameters whenever you add a transformation to the mapping. You can update the mapping parameters on the mapping

Parameters

tab. You can also view and access the parameter in the Outline view.

Add mapping parameters from reusable transformation parameters

After you add a transformation to a mapping, you can create a mapping parameter directly from the transformation

Parameters

tab. To create a mapping parameter from the transformation parameter, expose the transformation parameter as a mapping parameter. The Developer tool creates a mapping parameter that has the same name and type as the transformation parameter.

Add parameters to a non-reusable transformation

If you create a transformation in a mapping, the transformation is a non-reusable transformation. If you parameterize any of the transformation properties, you create mapping parameters instead of transformation parameters. The mapping parameters bind to the transformation parameters.