It would be a very sane idea to make sure you're using placeholders in all database commands that use parameters. For example, replace 
my $iface_result = $dbh->prepare("UPDATE device_iface_cache SET interf
+ace_status='$stat', lastcheck='$date', hostname='$host' WHERE hostnam
+e='$host' AND interface_name='$int_table{$key}';");
$iface_result->execute();

[download]
 with 
my $iface_result = $dbh->prepare("UPDATE device_iface_cache SET interf
+ace_status=?, lastcheck=? WHERE hostname=? AND interface_name=?");
$iface_result->execute($stat, $date, $host, $int_table{$key});

[download]
(no need to set hostname again where you select on it) or even easier, using DBIx::Simple with SQL::Abstract: 
$db->update('device_iface_cache',
    { interface_status => $stat, lastcheck => $date },
    { hostname => $host, interface_name => $int_table{$key} }
);

[download]
(DBIx::Simple uses a database handle that replaces DBI's $dbh, but is not exactly the same thing. Hence the different name $db. You get it by connecting through DBIx::Simple->connect instead of DBI->connect.)

In reply to Re: Interface flap detection in Perl by bart
in thread Interface flap detection in Perl by sunnyfedora99

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