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How to create a new/custom trigger in Aleph

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  • Article Type: General
  • Product: Aleph
  • Product Version: 20, 21, 22, 23

Description:
How can we create a new trigger, say znn_trigger_9, which would cause the column yy in the zmm table to be updated when column xx  in the znn table is updated?

Resolution:

1. Use the ./alephm/sql_tab/z105h_trigger.sql as znn_trigger_9.sql as a model, updating it appropriately for this case.  (It may be that in certain cases one of the other .slq  trigger files would be more applicable as a template for your new one.)

2. Add a znn_trigger_9 entry to the file_list of the library in which the znn table is located, like this:

  TRI znn_trigger_9

(Examples can be seen in the $aleph_root/tab/file_list.USR .) 

3. Do util a/17/6/1 to create the trigger, and util a/17/6/2 to enable the trigger.

4. Do util a/17/6/4 to confirm that the trigger has been enabled.

  • Article last edited: Feb 7, 2016