To make additional input data available to the transform, you can specify a secondary connection to a transform. You must define the connection type as supplement connection for additional connections to a Join transform or to a For each transform. You must define the connection type as primary connection for additional connections to any of the other transforms.
- Read the following concept topics:
- Create a graphical data map by using the Graphical Data Mapping editor. For more information, see Creating a graphical data map in the Eclipse editor.
- Add input and output objects to your graphical data map. For more information, see Adding input and output messages.
- Primary connection: You define a primary connection when you require multiple inputs to a transform.
- Supplement connection: You define a supplement connection to make additional sources of data available to a Join transform and to a For Each transform only.
You can also change the preferences of the Graphical Data Mapping editor. You can set the Let optional connection be primary for transforms that do not accept anymore primary connections preference.
The following steps show how to connect multiple input elements to a transform by using the drag and drop method:
- Move your cursor to the element of the input object that you want to map:
- Click anywhere in the input element, or on its grab handle icon
, and drag the connection to the output element. A connection is created between the two
elements, and a transform is assigned, based on the number and type of input elements. 
- Create a new connection between a second input element and the transform.
When you define an additional connection between a second input element to an existing transform in your graphical data map, you are prompted to specify if the connection is a primary connection or if it is a secondary connection (also known as a supplement connection).
- Specify the type of the new connection as either a primary
connection or a secondary connection (Supplement). If you specify
a primary connection, the default transform changes to one that allows
multiple primary inputs, such as Local Map, Concat, or Join.
For example:
You must choose supplement connection for additional connections to a Join transform, or to a For Each transform.
When you have created the connection between your input and output objects, select the required transform as described in Specifying a transform (mapping operation).
Copyright IBM Corporation 2012.
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