Re: sql identity column generate always (WHY HAVE TO RESET)

ive learned to do the following instead of cpyf (but my issue lies with the
lurking WRITE within rpg pgms)
(why they refer to the id column as "user" value, I have no idea)

insert into targetTable overriding user value
(select * from sourceTable)

Jay

On Fri, May 24, 2019 at 11:48 AM Craig Richards <craig@xxxxxxxxxxxxxxxx>
wrote:

I can't answer the question of why an identity column may get out of

wack.

I never trusted them in the first place.

I certainly was close to falling out with ID columns before I figured out
what was going on, but they've worked very well for me since.

Admittedly I'm working at a small site at the moment and our biggest table
using auto-gen IDs has a little under half a million rows currently, but it
gets hit by a web service and an internal application server concurrently
and I've not seen it misbehave.

I don't mistrust the auto-gen ID columns.
The only misgiving I'd have about using them would be if I couldn't
guarantee that no one would CPYF data into them.

(Yes, I suppose you could argue that I can't actually guarantee no one
would ever do that... )

On Fri, 24 May 2019 at 16:22, Nathan Andelin <nandelin@xxxxxxxxx> wrote:

I can't answer the question of why an identity column may get out of

wack.

I never trusted them in the first place.

Rather, we created a table that stores all our "next incremental" values
for all our files that need them, and pair that with generic procedure

that

returns the next incremental value like so:

rec.siep100k = genNextSeqn('SIEP100K');

We generally place that call within a service program that we call a
"database event handler", in a procedure named on_write(), which is a
trigger event handler. I'll post a code sample. The majority of our
database tables use surrogate keys, so this setup is invoked a lot. I'm

not

aware of any cases where an identity value has ever gotten out of wack.

But

if there were, we have a program that can query and maintain the next
identity values for any column in any table. As I indicated earlier,

those

values are just stored in a table. That table had hundreds of rows that
contain the next incremental value for hundreds of identity columns.

p on_write b export

/free

recptr = %addr(dbe.after);

if not is_valid();
return;
endif;

rec.siep100k = genNextSeqn('SIEP100K');

return;

/end-free

p on_write e
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