In the IUIE, what is a cascading parameter, and how do I set one up?

Cascading parameters allow a value for one report parameter to determine the values allowed for another parameter. In this document, the terms "parent" and "child" refer to parameters that participate in a cascading relationship. A parent parameter can have many child parameters, and a child parameter can have multiple parent parameters in a cascading relationship.

On this page:


Cascading parameter restrictions

Parent parameters must always appear above (i.e., have a lower parameter sequence than) associated child parameter(s). Child parameters participating in a cascading relationship must have a widget type of Listbox or Dropdown; other widget types are not supported. Parent parameters may be a Listbox, Dropdown, or Textfield, provided they are not a child of another parent parameter.

Parameter that depends on a single parent parameter

To set up a parameter that depends on a single parent parameter:

  1. On the Parameters page, scroll down to the parameter (child) to be cascaded, and then scroll right to change the widget type to either Dropdown or Listbox.

    Note: If you set the widget type to Listbox, set the Display Size value to the number of listbox entries that are visible without scrolling.

  2. In the "Valid Values" column for the parameter, click the Edit Valid Values icon. On the Edit Values page, enter an appropriate parameter-specific WHERE clause that includes a reference to the parent parameter (e.g., ##PARM:<Parent Parameter Tech Name>##).

    Example 1: Following is an example of a possible parameter-specific WHERE clause value of the child parameter when the parent parameter Valid Value codes are in the same table as the child Valid Value codes. In this example, the parent parameter is PARNT_PARM_CD, and the parent code column is PARNT_CD:

    	PARNT_CD  in (##PARM:PARNT_PARM_CD##)

    Example 2: The following example uses a sub-select to reference a different table that relates parent to child. In this example, the parent parameter is PARNT_PARM_CD, the parent code column is PARNT_CD, and the child code column is CHILD_CD:

    CHILD_CD  in (
    SELECT CHILD_CD  
    FROM MY_PARNT_CHILD_T 
    WHERE PARNT_CD in (##PARM:PARNT_PARM_CD##))

Parameter that depends on more than one parent parameter

To set up a parameter that depends on a more than one parent parameter, repeat the above steps, and then enter a parameter-specific WHERE clause that includes a reference to both parent parameters, for example:

CHILD_CD  in (
SELECT CHILD_CD  
FROM MY_PARNTS_CHILDREN_T 
WHERE PARNT1_CD in (##PARM:PARNT1_PARM_CD##)
AND PARNT2_CD in (##PARM:PARNT2_PARM_CD##))

In this example, the parent parameters are PARNT1_PARM_CD and PARNT2_PARM_CD, the parent code columns are PARNT1_CD and PARNT2_CD, and the child code column is CHILD_CD. This example uses a sub-select to reference a table that relates multiple parent codes to a child code.

Note: You can enter clauses as either parameter-specific or synonym-specific, but note that synonym-specific WHERE clauses apply globally to all uses of the synonym by all reports. Different reports sometimes use different names for the same parameter, so it is best to enter cascading WHERE clauses as parameter-specific. For example, the GT report ADM_APPL_GT uses the parameter ACAD_CAREER_CD, but the PDQ report IE_SIS_ADM_APPL names the same parameter ACAD_CAREER, and so the parameter-specific WHERE clause for the GT would refer to this parameter (for cascading parameter support) as ##PARM:ACAD_CAREER_CD##, whereas the PDQ WHERE clause would use ##PARM:ACAD_CAREER##.

This is document azfo in the Knowledge Base.
Last modified on 2010-12-13 00:00:00.

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