ODI 12c Reusable Mapping Concept

Question

Hello everyone,
I need and want to learn ODI. Using 12.1.2 edition, the problem is now about reusable mappings. The only thing found in google is the definition, there is no samples about how to use it! Google does not help me, can you?
Please,
Thank You

Answer 1

Hi,
A Reusable Mapping is just a mapping that can be used as a component within another mapping. It's rather like a subroutine or a procedure.
The main difference between a Reusable Mapping and a regular mapping is that the Reusable Mapping can contain input and output signatures. These signatures define the input parameters to the reusable mapping, and the output parameters. When the Reusable Mapping is displayed in a regular mapping, all you see are the signatures, which you connect up to your other components, just as you would a datastore or an aggregation.
Within the Reusable Mapping editor, you connect your input and output signatures to the components that you use to define the reusable mapping. So for example, if your reusable mapping's purpose was to filter out values less than 0, you would
- create your reusable mapping (specifying that it has input and output signatures)
- add an attribute to the input signature, INPUT.IN
- add an attribute to the output signature, OUTPUT.OUT
- drag a filter into the diagram
- link the input signature to the filter input,
- define the filter condition ( INPUT.IN > 0)
- link the filter output to the output signature
Then you would open your regular mapping, drag your reusable mapping into, and link a source table to it, with a suitable attribute mapping . The output from the reusable mapping would then be connected to the next component in the flow, and would provide attributes that are greater than 0.
This is a very trivial example, but your reusable mapping can be as complex as you like. It can even contain other reusable mappings itself, allowing you to break your logic into more manageable, and more maintainable chunks.
Nigel