David,
I didn't understand your 1st clause, "Now that (from UV10.1) Index-based
triggers are officially supported,...".
By "index-based triggers", I assume you mean the trick of indexing an
I-descriptor that calls a subroutine that updates some other file, which
is generally not the sort of thing you expect such a subroutine to do.
What is this "official support"? Did I miss an announcement, a change
in the documentation, or a whitepaper?
And by "support" - just to get my hopes up beyond all reason - does
that mean they've introduced some mechanism (@variable?) to help
distinguish among calls of the subroutine for insert (where indexing
calls the subroutine once, to find the new value to index) delete (where
indexing calls the subroutine 1x, to find the value to delete), and
change (where indexing calls the subroutine 2x, once with the old
version of the record, once with the new, to see whether the indexed
value has changed and, if so, what to delete, what to add.
Distinguishing these has always been tricky for the general case.
Hope springs eternal,
Chuck
On 8/1/2013 12:32 PM, Hona, David wrote:
Now that (from UV10.1) Index-based triggers are officially supported, can these
replace your SQL-based triggers? These have less functionality and less
overhead, but that's the price you have to pay....
Can't say I had a chance to try it for myself...yet...!
-----Original Message-----
From: u2-users-boun...@listserver.u2ug.org
[mailto:u2-users-boun...@listserver.u2ug.org] On Behalf Of Charles Stevenson
Sent: Saturday, 27 July 2013 5:32 AM
To: U2 Users List
Subject: [U2] [UV] Do you avoid TRIGGERS because of the difficulty using DEBUG
or RAID with them? Was: Universe Triggers
How many people avoid using triggers BECAUSE of the virtual impossibility of
using RAID with Triggers?
On 7/26/2013 12:33 PM, Phil Walker wrote:
I won't be holding my breath Charles ;-)
-----Original Message-----
From: u2-users-boun...@listserver.u2ug.org
[mailto:u2-users-boun...@listserver.u2ug.org] On Behalf Of Charles
Stevenson
Sent: Friday, 26 July 2013 9:22 p.m.
To: U2 Users List
Subject: Re: [U2] Universe Triggers
re. triggers & Raid, I could not agree with Phil more. Well said.
Come on, Rocket!
On 7/19/2013 1:32 AM, Phil Walker wrote:
Ken,
I am glad you raised the issue about debugging a program with a file which has
a trigger attached. I have been on to UV (Vmark/Ardent/IBM/Rocket for ages
about fixing this pushing for the ability to be able to step into the trigger
code, but at a VERY MINIMUM being able to debug the program and perform the
write on the file, and in effect step over the trigger subroutine and carry on
debugging. The issue is the trigger subroutine cannot support input, so what UV
have done is basically say you are using the debugger so you are inputting
debug commands so you will abort. They need to turn this restriction off for
debugging so that either of the above two scenarios is supported.
In a Microsoft world I can debug anything through the connected world of
web/databases etc......
Have had no feedback from UV
-----Original Message-----
From: u2-users-boun...@listserver.u2ug.org
[mailto:u2-users-boun...@listserver.u2ug.org] On Behalf Of Ken Ford
Sent: Friday, 19 July 2013 9:48 a.m.
To: u2-users@listserver.u2ug.org
Subject: Re: [U2] Universe Triggers
Dan,
In addition to the other responses you have received, I suggest the following:
1. Have one master file trigger subroutine (globally catalogued) that calls
subroutines (locally catalogued) tailored to individual files. This means you
don't have to stop and restart Universe when a new trigger is required or a
change to an existing one. If the master subroutine changes, you do have to
restart Universe.
2. Use a control record that records the subroutine name and state of the
trigger for each file having a trigger.
3. Use a program to change the state of a trigger, using the control records in
2 above.
4. Make sure all background processes that have a file with a trigger open are
logged out when recompiling the subroutine for that file trigger.
5. Remember that you can't do anything to a file with an active trigger whilst
in the RAID debugger (it will crash). Rather, if you are testing a file
trigger subroutine, drop the trigger and use a trigger testing program that
calls the subroutine after taking a copy of the record being changed, pausing
whilst you change it in another session, and then resuming, calling the
subroutine.
If you would like samples of any of the software mentioned above, let me know,
and I can send them to you.
Regards,
Ken Ford
Universe Software Developer
t 07 3013 8605 | f 07 3002 8400
e ken.f...@firstmac.com.au | w firstmac.com.au
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