Re: On Triggers and library lists.

Hi Charles,

Yes I usually prefer that method too but not all files are RPG access.
In particular there is one with a CLOB on.
I don't believe you can open files with CLOBs in native RPG.

Also the program is building JSON objects using the DB2 JSON_OBJECT
publishing function from data on the trigger after image for insert into
the CLOB so that all needs to be SQL.

But I agree, I have a particular preference for ExtFile when I can get away
with it.

best regards,
Craig

On 23 February 2018 at 17:24, Charles Wilt <charles.wilt@xxxxxxxxx> wrote:

I wouldn't use an override....

Instead, use the EXTFILE() keyword on the f-spec..

Charles


On Fri, Feb 23, 2018 at 3:44 AM, Craig Richards <craig@xxxxxxxxxxxxxxxx>
wrote:

Hi Dieter,

I'm not sure I agree - I think I CAN control the environment:

I'm using the LIBRARY on the trigger buffer. That tells me

unequivocally

which library the file is in.
All my triggers run in a named activation group.
I am overriding all file access using an activation group override

which

I

remove at the end of the trigger.
The overrides specify Secure( *Yes )

I can't at the moment see why this wouldn't work - do you think there

is

a

problem?

best regards,
Craig

On 23 February 2018 at 10:37, D*B <dieter.bender@xxxxxxxxxxxx> wrote:

<Craig>
I agree that as you say, once added, the trigger program is qualified

it

will always be located when the trigger on the table fires.
I was really only asking about whether it's usual to force the

trigger

to

use files in the same library the file triggers from, and if there

was

a

simpler way in SQL triggers than doing what I'm doing with an RPGLE

program

trigger - either overriding or qualifying all file access )
( for example, I wondered if the more SQL-Trigger savvy would start
shouting at me, something like: USE AN SQL TRIGGER AND SET SCHEMA YOU
MUPPET! )
So far that hasn't happened...

I can see that in general the problem is bigger than just the data -

as

you

point out - if the trigger program had a requirement to call other

programs

then that would be an additional concern but thankfully in my case it

is

not required.

So I guess your last sentence is the one that interests me the most -

"use

SQL for all I/O operations and qualify in all statements"

Given that I will mostly ( I hope ) only be dealing with 4 or 5 files

in

each trigger I think for safety I will qualify all file access.
</Craig>

Have in mind, that you can't controll the environment the trigger is
running in!!!

you can't rely on naming SQL or SYS, you can't rely on current

schema,

curlib, libl; you don't know, wether OVRDBF was used outside,

OVRSCOPE

and

...

Don't make the qualify hardcoded, look at the PSDS from wich lib the
trigger was called and use this lib as a qualifier.


D*B


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