Hi,
If SQL won't work...
have you tried to create a DDS described logical file with keys where you
rename the long field names by using the keyword ALIAS?
Mit freundlichen Grüßen / Best regards
Birgitta Hauser
"Shoot for the moon, even if you miss, you'll land among the stars." (Les
Brown)
"If you think education is expensive, try ignorance." (Derek Bok)
"What is worse than training your staff and losing them? Not training them
and keeping them!"
-----Ursprüngliche Nachricht-----
Von: midrange-l-bounces@xxxxxxxxxxxx
[mailto:midrange-l-bounces@xxxxxxxxxxxx] Im Auftrag von Aaron Bartell
Gesendet: Wednesday, 08. July 2009 21:10
An: Midrange Systems Technical Discussion
Betreff: SQL long column name band-aids
So this week I find myself working with a third part ERP package that had
their tables in DB2/400 created with SQL DDL. The column names are much
longer than the 10 chars RPG supports so I have been looking for a way to
remedy the solution. Obviously I could just use the generated 10 char
column names but those make code very unreadable so I am not going to use
that option.
Note I don't have the ability to change the SQL DDL of these tables and
recreate them, so anything I do has to be a veneer of sorts.
My first idea was to use SQL Views as those allow me to use the FOR
COLUMN
to alias the field down to 10 chars. For example:
CREATE VIEW CHRTACCT1V (
BA_RECCODE FOR COLUMN RECCOD,
SUB_NO FOR COLUMN SUBNO ,
ACCT_NO FOR COLUMN ACTNO ,
ACCT_TYPE FOR COLUMN ACTTYPE )
AS
SELECT
COALESCE(BA_RECCODE, 0) AS BA_RECCODE,
COALESCE(SUB_NO, 0) AS SUB_NO,
COALESCE(ACCT_NO, 0) AS ACCT_NO,
COALESCE(ACCT_TYPE, 0) AS ACCT_TYPE
FROM CHRTACCT;
Note: The COALESCE is to get rid of NULL values and replace them with the
columns default. This makes it easier to deal with in RPG.
This worked fine for 10 minutes until I came across the scenario where I
needed to do a SETLL and READE on the CHRTACCT1V View. Views can't have
indexes built on them. The tables definition doesn't have the short
column names so I can't create an index over it without having to resort
to the obscure column names.
Now, I know I can resort to doing embedded SQL in my RPG but I would
prefer to just use native opcodes as that keeps the code cleaner. Do any
of you SQL geeks have some pointers for me?
Aaron Bartell
[1]
http://mowyourlawn.com
p.s. If you want to see me shave parts of my body please head over to
[2]
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Yes it sounds gross, but it is for a good cause!
References
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