RE: SV: Embedded SQL

[Alan Campin <Alan.Campin@xxxxxxx>]

Have to agree 100% with you there. Defeats the whole purpose of using SQL. Data 
base independence. SQL should never bring anything in except what it needs. 

-----Original Message-----
From: Wilt, Charles [mailto:CWilt@xxxxxxxxxxxx]
Sent: Thursday, May 12, 2005 9:52 AM
To: RPG programming on the AS400 / iSeries
Subject: RE: SV: Embedded SQL


Good point Joel, I for one wasn't aware of it.

However, it could still be a problem since depending on such behavior assumes 
that columns will be added to the end of the file, unused columns will never be 
removed and in general the order will never change.

If you really need every column, maybe using select * could be excused.  But 
even then, it's simply the lazy way out.  It doesn't really take that much 
effort to get a list of the fields a file.  What to me is inexcusable, is the 
use of select * when you don't actually need all the fields.

Just my .02.

Charles Wilt
iSeries Systems Administrator / Developer
Mitsubishi Electric Automotive America
ph: 513-573-4343
fax: 513-398-1121
 

> -----Original Message-----
> From: rpg400-l-bounces@xxxxxxxxxxxx
> [mailto:rpg400-l-bounces@xxxxxxxxxxxx]On Behalf Of Joel Cochran
> Sent: Thursday, May 12, 2005 7:32 AM
> To: RPG programming on the AS400 / iSeries
> Subject: RE: SV: Embedded SQL
> 
> 
> On Thu, 2005-05-12 at 16:07, Wilt, Charles wrote:
> > Note however that while I've been guilty of using select * 
> in an embedded SQL statement myself, it is _NOT_ recommended.
> > 
> > Basically, if you use select *, and the file changes then 
> you need to recompile the program.
> 
> That depends on what SQLSTT condition you are testing.  If the file
> changes, the SQLSTT will be '01503', so if you are testing 
> for = '00000'
> then this statement is true, but if you are testing for <> 
> '02000' then
> it should continue to work.  
> 
> > Related is of course the use of customer_ds as an 
> externally defined DS.
> 
> Since this was copied at compile time, it should continue to work.
> 
> Joel
> http://www.rpgnext.com
>