RE: Even more embedded SQL.... -- RPG400-L


Thanks for your input Rick
I agree, each time a new sort sequence is requested, I will have to
dynamically build, prepare, and run an SQL statement. The speed of
processing the amount of data involved is unknown at this time, so that
does bother me.



Alan Shore

NBTY, Inc
(631) 244-2000 ext. 5019
AShore@xxxxxxxx


                                                                       
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             08/03/2006 11:17          RE: Even more embedded SQL....  
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I don't know your file sizes and I'm certainly not knocking SQL but it
seems to me that if you don't know the sort columns at run time you will
have to dynamically build, prepare, and run an SQL statement each time a
new sort sequence is requested.  That could be a really slow way to do
it.  I guess you could use the CASE statement but that takes you down
the same path as multiple logicals.

-----Original Message-----
From: rpg400-l-bounces@xxxxxxxxxxxx
[mailto:rpg400-l-bounces@xxxxxxxxxxxx] On Behalf Of Alan Shore
Sent: Thursday, August 03, 2006 10:03 AM
To: RPG programming on the AS400 / iSeries
Subject: RE: Even more embedded SQL....


No the WHOLE file of data


Alan Shore

NBTY, Inc
(631) 244-2000 ext. 5019
AShore@xxxxxxxx




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     Subject
             08/03/2006 10:50          RE: Even more embedded
SQL....
             AM





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So what are you sorting?  Just the records on the screen?

-----Original Message-----
From: rpg400-l-bounces@xxxxxxxxxxxx
[mailto:rpg400-l-bounces@xxxxxxxxxxxx] On Behalf Of Johnny Johnson
Sent: Thursday, August 03, 2006 9:47 AM
To: RPG programming on the AS400 / iSeries
Subject: Re: Even more embedded SQL....

OK, maybe I misstated a little.  I only fill one page at a

time.  When

the user pages down I fill another page, and so on.  If the

user pages

down 10 pages, then ten pages are still filled and I let

the subfile

handle the page up.
Typically, I've found that a user only want s to see one or

two pages

anyway.  If they need to see something farther down the file, they
will enter what it is they want to see.  If they want to

see something

farther up the file they have to enter the starting point

for filling

the subfile.

Johnny Johnson
Hub Group, Inc.





             Alan Shore

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     Subject
             08/03/2006 09:39          Re: Even more embedded
SQL....
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How do you handle page-up? I think (correct me if I am

wrong) that you

use FIND RELATIVE?
How do you handle position to? That one I am having difficulty in
working out within SQL?



Alan Shore

NBTY, Inc
(631) 244-2000 ext. 5019
AShore@xxxxxxxx



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                                       Re: Even more

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No, I use a one page at a time subfile.  Most of the files

I use this

for have a million records.  I use the sql loop the same

way I would a

loop with READ or READE.

First I build the sql statement based on what the user selects...
Second I do the following, where wrkSQL is the sql

statement, because

the sql statement changes from user to user...
C/exec sql
C+  close csr
C/end-exec

C/exec sql
C+  prepare sqlstmt from :wrkSql
C/end-exec

C/exec sql
C+  open csr
C/end-exec

Then as my sql read loop(for lack of a better term), where

sqlFile is

the data structure based on the externally defined file I

am reading

from.

C/exec sql
C+  fetch next from csr into :sqlFile
C/end-exec
Dow while sqlcod = *zero
   *
   *<subfile logic>
   *
C/exec sql
C+  fetch next from csr into :sqlFile
C/end-exec
enddo

Johnny Johnson
Hub Group, Inc.




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     Subject
             08/03/2006 09:21          Re: Even more

embedded SQL....

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Johnny - thanks for your reply, but I am betting that you do a load
all sub-file, and NOT a page at a time sub-file, which is

what I need

for 15,000 or more records.

I'm pretty sure that what I need to load page at a time is

FIND NEXT

FIND CURRENT FIND RELATIVE for things as Page up, Page Down etc.
but I'm not too sure how to do a position to within the

sub-file using

SQL


Alan Shore

NBTY, Inc
(631) 244-2000 ext. 5019
AShore@xxxxxxxx




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     Subject
             08/03/2006 10:08          Re: Even more

embedded SQL....

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I've always just built my sql statement based on what
column(s) the user selects to sort and then just filled the subfile
sorted the way the sql returns the data.
I'm not sure if this is what you are thinking, but it seems to work
really well.

Johnny Johnson
Hub Group, Inc.




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                                       Even more embedded SQL....

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  Hi All,

  I have been given a project that requires the need to display,
within a subfile, the data from 2
  separate files with the ability to sort that data from

any number of

different columns. So I
  thought to myself, this smacks of embedded SQL and

Dynamic Sorting

Subfiles. The unfortunate
  thing is that the data I have to display is over 15,000

records long

(and
growing) so if anyone
  can help me, I am looking for an example of embedded SQL

and Dynamic

Sorting Subfiles - Page at
  a time (with the ability to position to a particular

piece of data)"


  Some title for an article huh? If anyone has an example

of what is

required, or could point me
  in some direction, I would be very grateful.










Alan Shore

NBTY, Inc
(631) 244-2000 ext. 5019
AShore@xxxxxxxx
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