Re: SQL Cursor Positioning with Web Application -- WEB400

See, I knew there had to be something like that.

But, in a stateless environment will it apply. I guess we shall see.

Bradley V. Stone
BVSTools, Inc.
[1]www.BVSTools.com
[2]www.eRPGSDK.com

Craig Pelkie wrote:

Look in the IBM i SQL Reference manual for the "DECLARE CURSOR" statement,
especially the SENSITIVE and INSENSITIVE options.

There is a lot of support built into SQL for this very scenario, letting you
decide whether or not you want to view newly added rows (newly added since
you ran the SELECT statement). Rather than spend any time trying to invent
another wheel, you can use the native SQL support.

Craig Pelkie

----- Original Message -----
From: "Bradley V. Stone" [3]<bvstone@xxxxxxxxxxxx>
To: [4]<WEB400@xxxxxxxxxxxx>
Sent: Thursday, July 30, 2009 8:30 AM
Subject: [WEB400] SQL Cursor Positioning with Web Application

For years I've written Web Applications using dynamic SQL to build
result
sets.

For example, if a user wants to search a transaction history, I give
them
a bunch of fields that they can use to select records, and also options
to
sort by any of the columns. Pretty simple when using dynamic SQL.

For paging I store the RRN of the result set so when they click
"previous"
or "next" I use relative positioning with my SQL. Works great.

Now in this particular case where we're querying a transaction file it
gets updated very often. Lets say a few records every minute. So lets
say they view page one, click next so they're on page 2. Then next so
they're on page 3. During this time, 10 new records were added. So
they
go back which should be page 2, but it's really (for lack of a better
term) page 2.5 since more records have been added. :) So it loses the
positioning.

So, without using persistance, temp files, etc.. anyone have any ideas
here? Or is this a case where "that's just how it will work".

Thanks!
--

Bradley V. Stone
BVSTools, Inc.
[1]www.BVSTools.com
[2]www.eRPGSDK.com

References

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