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This page last changed on Feb 26, 2008.
How To Add an External Function to a Existing Physical Data Service
You can add qualified external operations (functions and procedures) from the same data source to existing physical data services based on:
- Relational
- Web service
- Java functions
This is a very convenient way of enhancing a data service based on changes in underlying data or other business needs.
The steps involved in adding an external function to a qualified data service are:
- Open the data service in Project Explorer.
- Select Overview mode.
- Right click > Add External Function...
- A wizard appropriate to the data service type will appear. Complete the steps as you would when creating a data service. For example, select from the set of currently unselected operations in the WSDL that underlies a web service-based data service.
Adding an External Function to a Data Service
External operations cannot be added to physical data services based on:
Qualified Operation and Physical Data Service Type Matrix
Artifact
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Physical Data Service Type
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Comment
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| Operation |
Web Service
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Only visible operations will be from the WSDL that underlies the physical data service.
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Function
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Java
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Only functions from the Java class defined by the underlying data service will be visible. |
| Stored Procedure |
Relational
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Only stored procedures from the same data source defined by the underlying data service will be visible.
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SQL Statement
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Relational
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Query must be to the same database as that underlying the data service.
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Additional Constraints
- Table-based functions cannot be added to data services.
- Only library operations can be added to library data services.
- Read or primary create-update-delete functions can be added to entity data services as long as the entity data services constraints are not violated.
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