What you also have to keep in mind is that one clause is not necessarily
keeping you from getting zero rows.
For example.
You have st_name and city.
Say you hve 5 entries for a street named "main" and 5 entries for a city
named "plainfield". But you have NO entries for a street named "main" in
the city of "plainfield". The fact you are looking for both is what returns
zero rows. Individually they exist.
What you are trying to do is nto easy at all. You can't just do if
statements to see which column has zero rows. You have to also check to see
what combo of clauses return ero.
Adam Lang
Systems Engineer
Rutgers Casualty Insurance Company
http://www.rutgersinsurance.com
----- Original Message -----
From: "Heather Johnson" <hjohnson@nypost.com>
To: <Timothy_Maguire@hartehanks.com>
Cc: <pgsql-php@postgresql.org>; <pgsql-php-owner@postgresql.org>
Sent: Thursday, July 26, 2001 2:30 PM
Subject: Re: [PHP] Re: how to determine where a select statement fails
> Thanks for the suggestion! I don't really want to do that though b/c the
> table that I'm searching is pretty large. I was hoping to do only one
query
> on the table and then put some indexes on the fields to improve
performance.
> But I can't think of a way to structure my code so that I can do just one
> query AND get info about which user-entered values don't find a match.
> (Brent Matzelle suggested that this isn't really a "failure" of the query,
> and I guess he's right, so hopefully this describes what I'm talking about
a
> little better).
>
> Heather
> > "Heather Johnson"
> > <hjohnson@nypost.com To:
> <pgsql-php@postgresql.org>
> > > cc:
> > Sent by: Subject: how to
> determine where a select statement
> > pgsql-php-owner@post fails
> > gresql.org
> >
> >
> > 07/26/01 11:15 AM
> >
> >
> >
> >
> >
> >
> > I am using php to do a select query which returns rows on the condition
> > that
> > a conjunction is true in the WHERE clause. This is the SELECT statement:
> >
> > SELECT low_range, high_range, st_name, city, zip FROM router
> > WHERE st_name = '$st_name' AND city = '$city' AND zip = '$zip';
> >
> > In the event that the query fails to return any rows, I'd like to be
able
> > to
> > determine which conjunct caused it to fail. So, for example, if the
> > user-entered $st_name isn't in the router table, I'd like to know that
> > st_name = '$st_name' is what made the conjunction false and caused the
> > query
> > to fail. $pg_errormsg isn't this specific about query failures though.
> Does
> > anyone know how I might be able to get this information?
> >
> > Thanks!
> > Heather Johnson
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