Re: 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

----- Original Message -----
From: <Timothy_Maguire(at)hartehanks(dot)com>
To: "Heather Johnson" <hjohnson(at)nypost(dot)com>
Cc: <pgsql-php(at)postgresql(dot)org>; <pgsql-php-owner(at)postgresql(dot)org>
Sent: Thursday, July 26, 2001 11:35 AM
Subject: [PHP] Re: how to determine where a select statement fails

>
> other than putting an if statement and doing 3 more queries, I can't think
> of anything
>
> something like:
> if(pg_numrows == 0)
> {
> select * from table where streetname = streetname
> if(pg_numrows == 0)
> {
> you found your error
> }
> else
> {
> do another query.........
> }
> }
>
> Tim.
>
> Timothy P. Maguire
> Web Developer II
> Harte-Hanks
> 978 436 3325
>
>
>
>
> "Heather Johnson"
> <hjohnson(at)nypost(dot)com To:
<pgsql-php(at)postgresql(dot)org>
> > cc:
> Sent by: Subject: how to
determine where a select statement
> pgsql-php-owner(at)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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