Modifying Action Diagrams › Understanding Conditions

Understanding Conditions

A condition specifies the circumstances under which an action, a sequential statement, or an iterative statement is to be executed. Conditions define a particular value for a field. The following examples demonstrate how conditions control processing.

A condition controlling a simple action would be an instance where, if a field’s condition is met, a simple action takes place.

  .—CASE

  |-RCD.*SFLSEL is *SELECT
  | Display record details
  ‘—

A condition controlling a sequence of actions would be an instance within a CASE construct where, if a field’s condition is met, a sequence of actions executes.

  .—CASE

  |-RCD.*SFLSEL is *SELECT
  |  .--
  |  : Display record details
  |  ‘--
  ‘—-ENDCASE

A condition controlling an iterative constant would be an instance within a REPEAT WHILE construct where while a field’s condition is met, a simple action takes place

  .= REPEAT WHILE

  |-RCD.Status is Held
  |  Display record details
  ‘—-ENDWHILE

Similarly, you could define multiple conditions within the same CASE construct to test for various conditions and the actions to take.

  .—CASE

  | -RCD.*SFLSEL is *SELECT
  | Display record details
  | -RCD.*SFLSEL is *Delete
  | Delete record details
  | -*OTHERWISE
  | Update record details
  ‘—ENDCASE