REST Data Sources

Representational State Transfer (REST) defines a set of architectural principles by which you can design Web services that focus on systems’ resources and how these resource states are addressed and transferred over HTTP by client applications written in different languages.

The REST implementation in TDV establishes a one-to-one mapping between these basic operations and HTTP methods.

Operation	HTTP/REST	SQL Equivalent
Create a resource on the server	POST	INSERT
Retrieve a resource	GET	SELECT
Update or change a resource state	PUT	UPDATE
Remove or delete a resource	DELETE	DELETE

When you define a REST data source, you define its URL connection information and its operations which include the input and output parameters. After definition, the REST data source in Studio contains a Web Service Operation for each defined REST operation. The Web Service Operations in Studio are similar to a stored procedure and can be used in the same way. Refer the User Guide, Chapter Procedures for more information.

This section contains the following topics:

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Adding a REST Data Source

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Setting a Value for NULL JSON Values in REST Responses

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Passing a Full XML Document in a POST Request to a REST Service

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Using an HTTP Header Parameter to Specify the Content Type

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Using Design By Example to Infer Parameter Data Types

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Cross-Origin Resource Sharing (CORS)