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  1.  Home
  2. SYSTEM21
  3. June 2002

SYS21 - RE: SYS21 - System 21 access from Vb













Dan,
I want to set up an obdc to Access. I was wondering if you could advise how
this is done and how I go about this.

We need to report differently and hold other note data for individuals on
the network and I would appreciate any help you can offer.

regards
Wilf.






                    Dan Thomas
                    <dthomas@mdimail.ne        To:
"'jbausers-l@midrange.com'" <jbausers-l@midrange.com>
                    t>                         cc:
                    Sent by:                   Subject:     RE: SYS21 - System
21 access from Vb
                    jbausers-l-admin@mi
                    drange.com


                    06/19/2002 11:42 AM
                    Please respond to
                    jbausers-l






I've successfully used MS Access to write hundreds of queries and reports
against JBA data.  You link Access tables to data on the AS/400 using an
ODBC connection.  Data continues to reside on the AS/400, but can be used
like local Access tables.  Access has a facility for defining relationships
between files and storing those relationships, or you can do it
individually
for each query.  You simply drag arrows between corresponding fields to do
the "chain".  I'm not that familiar with VB, but I would expect it uses
similar technologies.

We've found that performance varies dramatically from query to query and
probably depends upon your datasets and how the AS/400 query optimizer is
working.   One very nice thing about Access is that a data source for a
query can be another query or a query combined with a table.  I've often
been able to dramatically improve the performance of a query by breaking it
into multiple sub queries chained together.  You can easily have the
queries
prompt for runtime data, such as starting/ending customer#, invoice date,
etc.  One nice thing about Access queries is they can easily be extracted
into Excel with no programming.

You have the option in Access of writing SQL statements that run on the
AS/400 instead of letting Access run the normal way.  There are many
pundits
of this approach, but I personally have found it unnecessary.  One
performance issue to consider is the ODBC AS/400 access runs under the
interactive subsystem.  You have to be careful with this.  I expect some
expert users have figured out a solution for this.

Overall, I would say Access is a very good tool for developing queries.
Personally, I prefer it to any other tool I've used including DB2 SQL Query
Manager, IQ Objects and Crystal Reports.  I don't particularly care for the
Access report design tool.  In our environment, almost everything we do is
a
query that is then extracted into Excel.  If I was primarily developing
formatted reports for printing, I would probably use Crystal Reports.

In our environment, we use DataMirror to replicate our JBA AS/400 data to
MS
SQLServer to create a "datamart".  We use the datamart for our client web
information portal since we get dramatically better performance accessing
data from SQLServer than we do the AS/400.  Acess queries against this
datamart are also much faster than directly hitting the AS/400.

I hope that much of what I've written about Access applies to your VB
question.

Dan Thomas
Director of Information Technology
MDI
4500 Progress Blvd
Louisville, KY  40218
(502) 318-1208


-----Original Message-----
From: Kincer, Alan [mailto:akincer@kiusa.com]
Sent: Wednesday, June 19, 2002 11:08 AM
To: 'jbausers-l@midrange.com'
Subject: RE: SYS21 - System 21 access from Vb


This message is in MIME format. Since your mail reader does not understand
this format, some or all of this message may not be legible.
--
[ Picked text/plain from multipart/alternative ]

I will know in the future now to say "No vendor SOLICITATIONS" :) Of course
replies are always appreciated.

My response would have been to do it in FoxPro. Blazingly fast access of
400
data compared to VB, especially now with version 7.

-----Original Message-----
From: Randy Rasp [mailto:rrasp@infoalt.com]
Sent: Wednesday, June 19, 2002 11:27 AM
To: jbausers-l@midrange.com
Subject: Re: SYS21 - System 21 access from Vb


[ Converted text/html to text/plain ]
Darn!  No vendor replies?  I was going to tell you how to do it.   : )

_________________________________________________
Randy Rasp, CCP
Dallas Branch Manager
Information Alternatives
PO Box 168386
Irving, TX  75016-8386
Phone:  972-753-1266
Fax:  513-936-3710
www.infoalt.com
-----jbausers-l-admin@midrange.com wrote: -----
To: <jbausers-l@midrange.com>
From: jbausers-l-admin@midrange.com
Date: 06/19/2002 09:22AM
Subject: SYS21 - System 21 access from Vb

We are looking to write an inquiry program in Vb which needs to get
somedata
from Inventory.  Basically the equivalent of doing a couple of"Chain's" in
RPG.  Has anyone done this before, did it work, and whatmethod of accessing
the data did you use?Thanks in advance,NeilPS  No vendor replies
please.
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