Re: trigger advice needed

["David Morris" <dmorris@xxxxxxxxxxxxx>]

David,

We have been using I/O servers for several years.  The number 1 biggest 
drawback to using RPGIII for these was the inability to make recursive calls.  
I would estimate that 50% of the time we spent developing these servers was 
spent preventing the possibility of a recursive call.  When we re-wrote these 
servers in ILE we chose to use a single CL that calls an RPGIV sub-procedure 
that then calls a file specific RPGIV sub-procedure.  The overhead of the extra 
two calls is fairly small and gets around the recursive call problem.  Others 
may question the benefits of recursive calls in triggers or I/O servers, but in 
our environment I am certain we have saved hundreds of hours writing 
applications because of this capability.  

David Morris

>>> "David Prowak" <prowakd@emi.com> 10/24 8:42 AM >>>
Hi,

I have a MASTR_FILE that has a trigger attached to it.  It's a *BEFORE,
*UPDATE trigger, allowing repeated changes.   Under certain circumstances, 
when the master record is changed, I then need to make changes to 4 other
records from the MASTR_FILE.

So what happens is that when I go to change the 1st of the 4 records, 
the trigger program is called again, and I get an error because of the
recursive call.

How should I handle this situation?  I really want to define the business
rules for
this application in the DB, but I'm stuck.

I believe that recursion is supported in CL and RPG IV procedures, so 
could/should I write my trigger using those constructs? 

Or should I write some info on the 4 records that need to be changed 
to a DTAQ, and then process those in batch later?

I hoping the list can help me out.
Thanks,
Dave





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