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AWS Data Pipeline
API Reference (API Version 2012-10-29)

EvaluateExpression

Task runners call EvaluateExpression to evaluate a string in the context of the specified object. For example, a task runner can evaluate SQL queries stored in Amazon S3.

Request Syntax

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{ "expression": "string", "objectId": "string", "pipelineId": "string" }

Request Parameters

For information about the parameters that are common to all actions, see Common Parameters.

The request accepts the following data in JSON format.

expression

The expression to evaluate.

Type: String

Length Constraints: Minimum length of 0. Maximum length of 20971520.

Pattern: [\u0020-\uD7FF\uE000-\uFFFD\uD800\uDC00-\uDBFF\uDFFF\r\n\t]*

Required: Yes

objectId

The ID of the object.

Type: String

Length Constraints: Minimum length of 1. Maximum length of 1024.

Pattern: [\u0020-\uD7FF\uE000-\uFFFD\uD800\uDC00-\uDBFF\uDFFF\n\t]*

Required: Yes

pipelineId

The ID of the pipeline.

Type: String

Length Constraints: Minimum length of 1. Maximum length of 1024.

Pattern: [\u0020-\uD7FF\uE000-\uFFFD\uD800\uDC00-\uDBFF\uDFFF\n\t]*

Required: Yes

Response Syntax

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{ "evaluatedExpression": "string" }

Response Elements

If the action is successful, the service sends back an HTTP 200 response.

The following data is returned in JSON format by the service.

evaluatedExpression

The evaluated expression.

Type: String

Length Constraints: Minimum length of 0. Maximum length of 20971520.

Pattern: [\u0020-\uD7FF\uE000-\uFFFD\uD800\uDC00-\uDBFF\uDFFF\r\n\t]*

Errors

For information about the errors that are common to all actions, see Common Errors.

InternalServiceError

An internal service error occurred.

HTTP Status Code: 500

InvalidRequestException

The request was not valid. Verify that your request was properly formatted, that the signature was generated with the correct credentials, and that you haven't exceeded any of the service limits for your account.

HTTP Status Code: 400

PipelineDeletedException

The specified pipeline has been deleted.

HTTP Status Code: 400

PipelineNotFoundException

The specified pipeline was not found. Verify that you used the correct user and account identifiers.

HTTP Status Code: 400

TaskNotFoundException

The specified task was not found.

HTTP Status Code: 400

Example

Sample Request

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POST / HTTP/1.1 Content-Type: application/x-amz-json-1.1 X-Amz-Target: DataPipeline.DescribePipelines Content-Length: 164 Host: datapipeline.us-east-1.amazonaws.com X-Amz-Date: Mon, 12 Nov 2012 17:49:52 GMT Authorization: AuthParams {"pipelineId": "df-08785951KAKJEXAMPLE", "objectId": "Schedule", "expression": "Transform started at #{startDateTime} and finished at #{endDateTime}"}

Sample Response

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x-amzn-RequestId: 02870eb7-0736-11e2-af6f-6bc7a6be60d9 Content-Type: application/x-amz-json-1.1 Content-Length: 103 Date: Mon, 12 Nov 2012 17:50:53 GMT {"evaluatedExpression": "Transform started at 2012-12-12T00:00:00 and finished at 2012-12-21T18:00:00"}

See Also

For more information about using this API in one of the language-specific AWS SDKs, see the following: