Get Session Variables

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Last updated: Jun 09, 2015Version comment
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Overview

This step helps users who want to use variables at the session level for transformations. For example, users can include this step with the Call Endpoint step in a transformation which allows them to hit their BA Server session when the transformation is run.

Description

The Get Session Variables step allows you to retrieve the value of a session variable. This step can return rows or add values to input rows.

Note: You must specify the complete variable specification in the format ${variable} or %%variable%% (as described in Variables). You can also enter complete strings in the variable column, not just a variable. For example, you can specify: ${java.io.tmpdir}/kettle/tempfile.txt and it will be expanded to /tmp/kettle/tempfile.txt on Unix-like systems.

See Also:

Call Endpoint

Set Session Variables

Options

Option

Description

Step Name

Name of the step as it appears in the transformation workspace. This name must be unique within a single transformation.

#

The order the fields will be passed.

Field

Name of the field which will receive the value retrieved from the session variable. If a value cannot be retrieved, the default value is used.

Variable

Specify the name for the session variable which you want to retrieve for this step. Specify the value using a complete string to return rows or add values to input rows. For example, you can specify: ${java.io.tmpdir}/kettle/tempfile.txt and it will be expanded to /tmp/kettle/tempfile.txt on Unix-like systems.

Default Value

Specify the default value for the variable.

Samples

Six example transformations are included in the attached archive.  

  • callEndpointExample.ktr -- This transformation executes three different endpoint calls where the module, service , and method are parameterized from the input fields.
  • setSessionVariable.ktr -- This transformation illustrates setting a session variable from an input stream. The Data Grid step is used to generate the field.
  • getSessionVariable.ktr -- This transformation retrieves the variable defined in the SetSessionVariable.ktr sample.
  • getRolesForUser.ktr -- This transformation fetches the roles for the 'Admin' and 'Suzy' personas by executing two calls to the /userrolelist/getRolesForUser endpoint.
  • listRepository.ktr -- This transformation executes two calls to the repository, fetching the folder structure from the repository from /Home. One call is executed with a depth of '1' and the other with a depth of '4'.
  • showPlatformVersion.ktr -- This transformation executes an endpoint call to retrieve the platform version.