Re: subfile page up & down using embedded SQL

In addition to the RELATIVE mentioned here, you might consider
having the system maintain the subfile page-up i.e. sflsize = sflpage + 1.
But then your 'Position to. . .' will always start at the top.

joeM



----- Original Message -----
From: "Dan Bale" <dbale@xxxxxxxxxxxxx>
To: <RPG400-L@xxxxxxxxxxxx>
Sent: Wednesday, October 13, 2004 10:09 AM
Subject: subfile page up & down using embedded SQL


> Esteemed listers:
>
> I thought I had seen references to this before, but I am coming up empty
> searching the archives both from the search page and from google.
>
> I have a subfile inquiry app that currently loads the subfile a page at a
> time via SETLL and a READ loop.  Paging works as expected; Page Down gets
> the next set of records following the one appearing at the bottom of the
> current page, and Page Up gets the set of records prior to the one
appearing
> at the top of the current page.  There is also a "Position To:" entry at
the
> top that invokes the SETLL.
>
> I am attempting to introduce new features that require SQL FETCH to
replace
> the SETLL, READ, and READP operations.  (Note, FWIW, this is _not_ READE
or
> READPE.)  Well, not really sure how to replace the SETLL part.  I think I
> understand that I would use FETCH NEXT to emulate READ and FETCH PREVIOUS
to
> emulate READP.
>
> I think I would know how to handle the Page Down routine --- just do
another
> iteration of FETCH NEXT for a new page.  But the Page Up routine, this
one's
> a bugger.  Since I load a subfile page from top to bottom, the SQL cursor
is
> positioned at the record that appears at the bottom of the subfile.  In
> normal RPG I/O, when a Page Up is requested, I would just SETLL using the
> first subfile record, and READP from there.  I'm just not getting how I
> would accomplish this using embedded SQL.
>
> And if someone has a template that shows how to code a inquiry-only
subfile
> using SQL and is willing to share it, all the better.
>
> FWIW, References I've found thus far:
> iSeriesNetwork: Paul Conte's "SQL Crib Sheet for RPG Programmers", March
> 2000, article #3326
> David Morris: http://archive.midrange.com/midrange-l/199911/msg01499.html
>
> tia,
> db
>
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