Re: Trigger pgm to increment seq# in file

Identity columns are perfect for autonumbering.
We use them alot, over 80 % of our header tables I think. Contract numbers,
invoice numbers, etc.
There is one caveat I don't like about them: when a transaction is rolled
back before completion, you'll lose the number that was used for the
identity in that transaction.

Best regards,
-Arco

Op donderdag 4 mei 2017 heeft Rob Berendt <rob@xxxxxxxxx> het volgende
geschreven:

As Birgitta said, a before insert is what you want.

I do have to ask though. Why not use an identity column and have the
system autoincrement it for you?

Create table...
myKeyColumn int as identity,
...

Or perhaps a sequence object? Below is a tested example of sequence
created with "Run SQL Scripts":

set current schema rob;

create or replace sequence NextKey;

create table scuzz (
myKeyColumn int as identity,
SomeOtherColumn char(5),
CounterNumber int);

insert into scuzz
(SomeOtherColumn, CounterNumber)
values ('A', next value for NextKey);

insert into scuzz
(SomeOtherColumn, CounterNumber)
values ('B', next value for NextKey);

select * from scuzz;
you will see:
1, A, 1
2, B, 2

values previous value for NextKey;
You will see: 2

If you want to know what object it creates try DSPDTAARA. It's rather
complex though.
Data area . . . . . . . : NEXTKEY
Library . . . . . . . : ROB
Type . . . . . . . . . : *CHAR
Length . . . . . . . . : 2000
I think it uses all that space to keep track of last accessed information.

Rob Berendt
--
IBM Certified System Administrator - IBM i 6.1
Group Dekko
Dept 1600
Mail to: 2505 Dekko Drive
Garrett, IN 46738
Ship to: Dock 108
6928N 400E
Kendallville, IN 46755
http://www.dekko.com





From: Steve Jones <sjones@xxxxxxxxxxxxxxx <javascript:;>>
To: rpg400-l@xxxxxxxxxxxx <javascript:;>
Date: 05/04/2017 09:13 AM
Subject: Trigger pgm to increment seq# in file
Sent by: "RPG400-L" <rpg400-l-bounces@xxxxxxxxxxxx <javascript:;>>



We have a file that contains a sequence number for each unique key in the
file, file is defined like this:

Filea:
Field1 (key1)
Field2 (key2)
sequence number (starts at 1)

We want to have a trigger program fire when a record is added to set the
sequence number of the new record to be the next #.

So I tried adding a trigger with trigger time of *after & event *insert,
that fails because the record is still in use.

Seems like a simple idea, but we are missing something.

Thanks

--
Steve Jones
H-P Products, Inc
330-871-2054

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