[AccessD] SQL_Svr BE Access FE

Haslett, Andrew andrew.haslett at ilc.gov.au
Tue Aug 26 22:06:23 CDT 2003


Agree with Access Repl. being flaky, but once set up properly it can be
useful.

Point taken about security within corporate environment, but still don't
understand why an ASP script is preferred over other methods that can do
anything that ASP can do and more ->  VB, DTS, VBScript etc.  Why restrict
your feature set to ASP when there is no web interface required and there is
no advantage over using HTTP?

(Don't get me wrong, I'm a big fan of ASP and use it heaps - but don't see
the point when other methods are easier to design, schedule, implement)

Cheers,
Andrew

-----Original Message-----
From: Eric Barro [mailto:ebarro at afsweb.com]
Sent: Wednesday, 27 August 2003 11:46 AM
To: Access Developers discussion and problem solving
Subject: RE: [AccessD] SQL_Svr BE Access FE


Replication with SQL server yes...replicaton with MS Access? Hmmm...well you
might want to rethink that.

Why run an ASP script? Because the ASP page will run the HTTP post. I don't
see why HTTP access to the SQL server back end is a security risk if the web
server and the SQL server are on the same LAN segment where only the web
server can talk to the SQL server via the listening ports on SQL.

---
Eric Barro
Senior Systems Analyst
Advanced Field Services
(208) 772-7060
http://www.afsweb.com 

-----Original Message-----
From: accessd-bounces at databaseadvisors.com
[mailto:accessd-bounces at databaseadvisors.com]On Behalf Of Haslett,
Andrew
Sent: Tuesday, August 26, 2003 6:19 PM
To: 'Access Developers discussion and problem solving'
Subject: RE: [AccessD] SQL_Svr BE Access FE


Agree with 1 and 3, but why run an ASP script when no web interface is
required.

Anything you can initiate with ASP can be done through straight VB code,
unless access the the SQL Server BE is limited to HTTP access (bad idea
security wise).  That said if you are synching databases then the built-in
replication systems of both SS and Access should generally be used instead
of manual methods.

Cheers,
Andrew

-----Original Message-----
From: Eric Barro [mailto:ebarro at afsweb.com]
Sent: Wednesday, 27 August 2003 10:15 AM
To: Access Developers discussion and problem solving
Subject: RE: [AccessD] SQL_Svr BE Access FE


I would do the following:

1. Access FE on the LAN with Access BE on the same LAN - one for each
location
2. VB code that calls an ASP page that talks to a back-end SQL server or
even Access MDB in a data center location. ASP page is used to post data to
Access MDB at data center location.
3. At night data can be pushed back to the Access MDB at the local site
using an FTP download and import process into the local Access MDB

This should synch up your DBs.

---
Eric Barro
Senior Systems Analyst
Advanced Field Services
(208) 772-7060
http://www.afsweb.com 

-----Original Message-----
From: accessd-bounces at databaseadvisors.com
[mailto:accessd-bounces at databaseadvisors.com]On Behalf Of Haslett,
Andrew
Sent: Tuesday, August 26, 2003 5:03 PM
To: 'Access Developers discussion and problem solving'
Subject: RE: [AccessD] SQL_Svr BE Access FE


Replication.

Unless you have a *very* high speed WAN connection then your performance
will suffer with only a single BE, even with an ADP.  One option is to
replicate the back-end to each office, however this will obviously have SQL
Server license implications, and therefore $$.  This is one advantage that
Access has, you can replicate the back-ends without cost!  (Access
replication is a little more flaky than SS though..)

If you do have access to a VPN, then I would encourage users to Terminal
Serve/Remote Desktop to the location where the back-end is located.  This
means the only traffic between offices is the screen 'display'.  No actual
data would be transferred across offices.  

It also saves you having to distribute front-ends to different offices - you
can just maintain a couple of front ends in the one office - ie. one
front-end for Terminal Server users, and another for each of the users in
that particular office.  No replication, no distribution of front-ends. It
*will* mean you probably need a dedicated 'Terminal Server' or at least a
couple of free machines in that office for users from the other offices to
Remote Desktop into.

Cheers,
Andrew

-----Original Message-----
From: Stephen R. Zayko [mailto:szayko at secor.com]
Sent: Tuesday, 26 August 2003 10:05 PM
To: 'Access Developers discussion and problem solving'
Subject: RE: [AccessD] SQL_Svr BE Access FE


Thanks Andrew

I am starting from scratch right now.  That was the reason for the first
post:  so that I could start down a path that would have good
performance.  I also wanted to choose the option that would be the most
flexible for me in programming and for the app in future development,
add-ons, and changes.  

As for a web based front end... that is out of the question.  Some of
the users have had bad experiences with a WB_FE and will not entertain
the idea.  They like Access, which is good for me!

The clients are employees of a medium sized engineering company.  They
will be accessing the App from each of the ~30 offices throughout the US
and Canada.  Each office will have one FE for an Engineer or Project
Manager to examine status of a job as detailed by input from other
Engineers/Geologists throughout the country.

Is there a fourth way to connect to a BE data source?

-Stephen

-----Original Message-----
From: accessd-bounces at databaseadvisors.com
[mailto:accessd-bounces at databaseadvisors.com] On Behalf Of Haslett,
Andrew
Sent: Monday, August 25, 2003 09:36 PM
To: 'Access Developers discussion and problem solving'
Subject: RE: [AccessD] SQL_Svr BE Access FE

If you're starting from scratch then an ADP will offer the best
performance.
You will need to use ADO to interact with the BE which may be a drawback
if
you are used to DAO.

If you already have a front-end then ODBC links may be the best option
as it
will require very little alteration of existing code / queries etc.

You're third option is *basically* what an ADP does, in that it makes
ADO
calls to SQL Server when required.

When you say 'live on the internet' are you talking about your SS BE?
If
so, then perhaps a web-based front end will offer the best solution. Who
are
your clients? Where will they be accessing it from?  Are you
distributing
the FE to numerous locations? etc.

Cheers,
Andrew


-----Original Message-----
From: Stephen R. Zayko [mailto:szayko at secor.com]
Sent: Tuesday, 26 August 2003 10:26 AM
To: 'Access Developers discussion and problem solving'
Subject: [AccessD] SQL_Svr BE Access FE


Dear group:

I was wondering if I could get some input for the following scenario:

I am writing an AccessXP FE for a MS_SQL Server database that will live
on the internet.  I was wondering how would be the best way to connect
to the data (only I can TRULY answer this question)?  But in asking
myself that, I was wondering what the pros and cons of each of these are
and if anyone has strong feelings one way or another on these:

1)  Linked tables via ODBC (using system DSN)
2)  Write the FE as an .adp with tables directly connected to server
tables
3)  Call all connections on the fly to the server where the BE is
located
4)  Some other way that I do not know about.

Most users will have an DSL or T1 connection to the internet.

Thanks in advance for your inputs.

-Stephen Zayko

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