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  1.  Home
  2. RPG400-L
  3. May 2017

RE: Trigger pgm to increment seq# in file

Hi Steve
I'm curious - what advantage do you have for there being multiple records with the same sequence number (but different fieldA)?

Alan Shore
E-mail : ASHORE@xxxxxxxx
Phone [O] : (631) 200-5019
Phone [C] : (631) 880-8640
'If you're going through hell, keep going.'
Winston Churchill


-----Original Message-----
From: RPG400-L [mailto:rpg400-l-bounces@xxxxxxxxxxxx] On Behalf Of Steve Jones
Sent: Thursday, May 04, 2017 11:18 AM
To: RPG programming on the IBM i (AS/400 and iSeries) <rpg400-l@xxxxxxxxxxxx>
Subject: Re: Trigger pgm to increment seq# in file

The sequence is based on a field in the file, so there could be multiple records with same seq# Example file would be FieldA, Seq

File:

FieldA = "TEST" Seq = 1
FieldA = "TEST" Seq = 2
FieldA = 'ROB' Seq = 1
FieldA = 'STEVE' Seq = 1

On Thu, May 4, 2017 at 11:12 AM, Rob Berendt <rob@xxxxxxxxx> wrote:

I don't understand your question.


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>
To: "RPG programming on the IBM i (AS/400 and iSeries)"
<rpg400-l@xxxxxxxxxxxx>
Date: 05/04/2017 11:05 AM
Subject: Re: Trigger pgm to increment seq# in file
Sent by: "RPG400-L" <rpg400-l-bounces@xxxxxxxxxxxx>



Never saw a identity column before, that would be perfect.

Can the number be based on like key field? In your example:

1, A, 1
1, A, 2
2, B, 1

On Thu, May 4, 2017 at 10:18 AM, Rob Berendt <rob@xxxxxxxxx> wrote:

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



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

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

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NOTE: The information in this email is confidential and may be legally privileged. If you are not the intended recipient, you must not read, use or disseminate the information; please advise the sender immediately by reply email and delete this message and any attachments without retaining a copy. Although this email and any attachments are believed to be free of any virus or other defect that may affect any computer system into which it is received and opened, it is the responsibility of the recipient to ensure that it is virus free and no responsibility is accepted by H-P Products, Inc. for any loss or damage arising in any way from its use.
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