How can I use a query with placeholder inside quotes? (perl / postgresql)

Question

I\'m trying to execute the following script:

#!/usr/bin/perl -w

use strict;
use DBI;

my $db = \"Pg\";
my $db_database = \"whatever\";
my $user = \"whatever         


        

Answer 1

I just found a solution here: http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=321917

It works using ?::interval instead of 'interval ?':

my $query = $dbh->prepare (q{SELECT
                   arrival_date - ?::interval
                   FROM emails LIMIT 1});

$query->execute('60 MINUTE');