Message-Id: <199809172337.TAA25897@bgalli.mug.org>
From: "Billy G. Allie" <Bill.Allie@mug.org>
Reply-To: "Billy G. Allie" <Bill.Allie@mug.org>
To: Byron Nikolaidis <byronn@insightdist.com>
Cc: pgsql-interfaces@postgreSQL.org, pgsql-hackers@postgreSQL.org
Subject: Re: [HACKERS] Re: [INTERFACES] Odbc parser error 
In-reply-to: Your message of "Thu, 17 Sep 1998 16:33:31 EDT."
	<3601721B.B2493AA3@insightdist.com>
Date: Thu, 17 Sep 1998 19:37:22 -0400
Sender: bga@mug.org

Byron Nikolaidis <byronn@insightdist.com> wrote:

> Sferacarta Software wrote:
> 
> > Hi all,
> >
> > Seems that ODBC driver have some problems while it translate Access
> > commands.
> > I created a form with a subform joined by two columns.
		[...]
> > NB: Note that parser translate ("progressivo" =  NULL) instead of
> > ("progressivo" IS NULL).
> >
> >
> 
> Yes, the NULL works for parameters of an update statement, where Access would
> specify a statement such as "update table set param = ? where x = 1".  But
> it doesn't work in a select statement.  I don't think I have much to work
> with here.  The statement comes in as something like "select * from table
> where x = ?".  I have to replace the ? with something.  On updates, 'NULL'
> works fine.
> 
> I'm not sure what to do about this.  On other dbms, parameter passing is
> handled through a separate protocol to the backend, usually after a prepare
> statement, so on these its no problem to send a null, or large amounts of
> ascii/binary data, without having to worry about direct substitution into
> the sql string or hitting the upper limit of the statement string.  I think
> until Postgres has such as protocol for parameter substitution/passing, it
> will be difficult to fix this problem.
> 
> Any suggestions?
> 
> Byron

How about subsitution any occurance of /=[ \t]*?/ with "IS NULL".  This should
work for both select and update statements.
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