$sth=$dbh->prepare($sql_string) or die_db(...)

sub die_db{
#
#	Send emails.
#
    my $message=shift;
    my $line_number=shift;
    print STDOUT $line_number, "\n", $message;
    my $from = hostname().'@i-mageonline.com';
    my $msg = "There has been an error at line $line_number. \nThe error message is '$message'. ";
    my $sender = send_email("DB Error at line $line_number", $msg, $from);
    my $result =  $sender->MailMsg({
	    msg => $sender->{msg},
    }) or die "$Mail::Sender::Error\n";
    die "DB Error" . DBI->errstr;
}