After spending some hours talking with the kind folks in #postgresql, I was unable to find someone who was able to point me in the right direction towards solving a data access problem between Postgresql, MS-Access 2000, and the PostgreSQL30 ODBC driver.

Here's my setup:
- Win2k Professional
- MS-Access 2000
- Postgresql-7.4.2 running on Gentoo Linux

After a considerable amount of netsleuthing, I finally able to find someone who had devised a way to implement Row Level Security with Postgres. (As seen on: http://www.varlena.com/varlena/GeneralBits/77.php * scroll down to the "Proof of Concept" section...)

The basic idea is to create an additional userid field in your source table, then create a view of the source table which excludes the userid and apply rules for select, update, view and insert.

Here's a describe of a test view (which can be linked without problem in MSAccess), and the view that I created for my table (just in the testing phases now)
http://rafb.net/paste/results/gmYOkn43.html

This all seems to work without any problem whatsoever when I change the user and perform the select from the psql utility. You can see how I have performed a test of this functionality here:
http://rafb.net/paste/results/rQHqmC51.html

Now, once I get to MS-Access, here is where stuff breaks:

1. In MS-Access 2000 * select File, Get External Data, Link Tables...
2. Select Files of Type ODBC Databases()
3. Select the postgresql datasource previously defined
4. Enter the database name, server name, port, username (in this case 01BLUESHIELD) & password
5. The database connects fine (which indicates to me that there are no problems with the connection and/or permissions on the user account) and it shows all of the system schemas and 3 public tables.

The FIRST table is public.tblparticipant *> this is the view that I have created which, when selected, should only return the records (about 250 records) which are associated with the login (01BLUESHIELD) as per the rules mentioned earlier. When selected, it returns an empty recordset, which makes NO sense, considering this code works fine from psql.

The SECOND table is the public.tblparticipants *> selecting from this table = access denied. This makes sense given the privileges I established on the account.

The THIRD table is public.test *> this table (as shown in the link above) is a view of * in tblparticipants. When I select this table, all 2406 records return normally, which indicates to me that the ODBC driver doesn't have any problem "handling" views as opposed to tables.

Does anyone have some insight as to what's going wrong or how to fix it?

I'd be greatly indebted.. maybe could even paypal someone a few bucks if they have some idea!


Kind regards,

../Peter T. Bense

Peter T. Bense (ptbense (AT) gwm (DOT) sc.edu) - 803-777-9476
Database Administrator/Webmaster
Prevention Research Center
University of South Carolina


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TIP 4: Don't 'kill -9' the postmaster

Hello Peter,

I don't know what your exact problem is, but here is a list of points I would test if I were you:

1) Test with another driver version.
The old installer installs version 7.03.02.00, and there is snapshot with version 7.03.02.08. Make sure to use the second version, or the driver snapshot that has just been released for PGSQL 8. This is version 8.00.00.02. It works fine for me, with a 7.5.4 database as well.

If you use the 7.xx driver, you have three drivers actually: use "Postgresql", and not the Unicode or Legacy drivers.

Here is the link: http://gborg.postgresql.org/project/....php?downloads

2) Test with another MS Office installation. Weird installation?
3) Test with the postgres/pgsql user. Permission problem?
4) Use a pass-through query instead of a linked view. Primary key problem?

Regards,

Philippe Lang

-----Message d'origine-----
De : pgsql-odbc-owner (AT) postgresql (DOT) org [mailtogsql-odbc-owner (AT) postgresql (DOT) org] De la part de Peter Bense
Envoyé : vendredi, 29. octobre 2004 01:09
À : pgsql-interfaces (AT) postgresql (DOT) org; pgsql-odbc (AT) postgresql (DOT) org
Objet : [ODBC] ODBC / MS-Access... linking a ms-access DB to a view...

After spending some hours talking with the kind folks in #postgresql, I was unable to find someone who was able to point me in the right direction towards solving a data access problem between Postgresql, MS-Access 2000, and the PostgreSQL30 ODBC driver.

Here's my setup:
- Win2k Professional
- MS-Access 2000
- Postgresql-7.4.2 running on Gentoo Linux

After a considerable amount of netsleuthing, I finally able to find someone who had devised a way to implement Row Level Security with Postgres. (As seen on: http://www.varlena.com/varlena/GeneralBits/77.php * scroll down to the "Proof of Concept" section...)

The basic idea is to create an additional userid field in your source table, then create a view of the source table which excludes the userid and apply rules for select, update, view and insert.

Here's a describe of a test view (which can be linked without problem in MSAccess), and the view that I created for my table (just in the testing phases now) http://rafb.net/paste/results/gmYOkn43.html

This all seems to work without any problem whatsoever when I change the user and perform the select from the psql utility. You can see how I have performed a test of this functionality here:
http://rafb.net/paste/results/rQHqmC51.html

Now, once I get to MS-Access, here is where stuff breaks:

1. In MS-Access 2000 * select File, Get External Data, Link Tables...
2. Select Files of Type ODBC Databases() 3. Select the postgresql datasource previously defined 4. Enter the database name, server name, port, username (in this case 01BLUESHIELD) & password 5. The database connects fine (which indicates to me that there are no problems with the connection and/or permissions on the user account) and it shows all of the system schemas and 3 public tables.

The FIRST table is public.tblparticipant *> this is the view that I have created which, when selected, should only return the records (about 250 records) which are associated with the login (01BLUESHIELD) as per the rules mentioned earlier. When selected, it returns an empty recordset, which makes NO sense, considering this code works fine from psql.

The SECOND table is the public.tblparticipants *> selecting from this table = access denied. This makes sense given the privileges I established on the account.

The THIRD table is public.test *> this table (as shown in the link above) is a view of * in tblparticipants. When I select this table, all 2406 records return normally, which indicates to me that the ODBC driver doesn't have any problem "handling" views as opposed to tables.

Does anyone have some insight as to what's going wrong or how to fix it?

I'd be greatly indebted.. maybe could even paypal someone a few bucks if they have some idea!


Kind regards,

../Peter T. Bense

Peter T. Bense (ptbense (AT) gwm (DOT) sc.edu) - 803-777-9476 Database Administrator/Webmaster Prevention Research Center University of South Carolina


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TIP 4: Don't 'kill -9' the postmaster



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TIP 8: explain analyze is your friend

HI all,

i'm trying to insert images in a PostgreSQL database
from a VB application using ODBC.

So, i found there is a way involving an oid datatype
column using lo_import/export functions. Can i use
this with ODBC, how?

Another way i found is with a bytea datatype column
but a i need an equivalent of the PQescapeBytea
function that comes with libpq. There is such a thing
in ODBC?

thanx in advance,
Jaime Casanova

__________________________________________________ _______
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Información de Estados Unidos y América Latina, en Yahoo! Noticias.
Visítanos en http://noticias.espanol.yahoo.com

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TIP 5: Have you checked our extensive FAQ?

http://www.postgresql.org/docs/faqs/FAQ.html

Hi all,

I want to know if there is someone working on the
odbc, and what are the plans to improve it if any.


regards,
Jaime Casanova



__________________________________________________ _______
Do You Yahoo!?
Información de Estados Unidos y América Latina, en Yahoo! Noticias.
Visítanos en http://noticias.espanol.yahoo.com

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TIP 7: don't forget to increase your free space map settings

Jaime Casanova wrote:
There is currently no one doing any active development on the ODBC
driver. A few people are helping out with minimal maintenance, but
there will be no major new developments unless someone else steps up.

--
Peter Eisentraut
http://developer.postgresql.org/~petere/


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TIP 4: Don't 'kill -9' the postmaster

Wow! I must not have been paying attention.
Who is managing the project?


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TIP 7: don't forget to increase your free space map settings

markw (AT) mohawksoft (DOT) com wrote:
Mostly Dave Page, although he will probably claim that he isn't.

--
Peter Eisentraut
http://developer.postgresql.org/~petere/


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TIP 5: Have you checked our extensive FAQ?

http://www.postgresql.org/docs/faqs/FAQ.html