How to access report parameter default values from a DataSetWizardPage class?

Jesse Weinstein

I'm trying to read and write the default values of report parameters that are linked to data set parameters from within a DataSetWizardPage implementation. I want to do this because I've placed a copy of the default values for the data set parameters directly in the query, and I want to keep that copy in sync with the default values in the report parameters.

I put the copy of the default values in the query in order to make those default values available when getting the data set metadata, which normally simply replaces all the parameters with a single, fixed value, which doesn't work for the query I'm trying to implement.

Any suggestions would be gratefully appreciated.

(Also asked on the Eclipse.org BIRT forum, here: http://www.eclipse.org/forums/index.php/t/477288/ )

Linda Chan

From BIRT architecture perspective, a data set design is intended to be consumed by the report design layer, and thus not recommended to have direct knowledge of report components, including a report parameter. The linking of a data set parameter to a report parameter is in fact kept in the BIRT *report* design Model, and is not known to a data set design. Also keep in mind that a report parameter may be shared and referenced by other report components, and/or even linked by multiple data set parameters. So it is not necessarily a one-to-one relationship between a report parameter and data set parameter.

For your use case, perhaps the users should be asked to change the default value of a data set parameter as needed, instead of a report parameter? The Parameters page in the Data Set Editor offers the UI for such user action. A DataSetWizardPage would then have access to the current default value of its data set parameter (via the oda.design model).

Hope this helps.

Linda