RE: [INTERFACES] Foreign Keys

I have created the following trigger on the parent/master table (orders):

CREATE TRIGGER Orderlines_fkey
BEFORE DELETE OR UPDATE ON Orders FOR EACH ROW
EXECUTE PROCEDURE check_foreign_key ();

check_foreign_key() actually deletes rows from the orderlines table when
every a row is deleted from orders. This triggers works great. Access,
however, is still not recognizing the foreign key relationship between
orders and orderlines. Any other suggestions?

Thanks, Michael

-----Original Message-----
From: Byron Nikolaidis [SMTP:byronn(at)insightdist(dot)com]
Sent: Thursday, February 25, 1999 8:38 AM
To: Michael Davis
Cc: 'pgsql-interfaces(at)postgreSQL(dot)org'; pgsql postgres;
pgsql-hackers(at)postgreSQL(dot)org
Subject: Re: [INTERFACES] Foreign Keys

Michael Davis wrote:

> What is the possibility of recording foreign keys (a partial
foreign key
> implementation) in the database such that the ODBC interface can
correctly
> report them to client applications? This would require an
enhancement to
> Postgres and to the ODBC driver for Postgres. I have a problem
with Access
> 97 not working properly with forms that contain sub forms
representing
> parent/child or master/detail tables. For example: orders and
orderlines.
> I think this is caused by the lack of foreign key support. I am
basing this
>

The driver does support SQLForeignKeys. It does say it supports
this function
in SQLFunctions.

However, the current implementation is based on the SPI/trigger
stuff from the
pg_trigger table. If you don't have any trigger info, then
SQLForeignKeys will
not report anything. This is most likely the problem.

Byron