That is what you call doing it once and only once? 
my $namespace = \%GMPN::Database::Table::;
my %inject = (
    pre_insert => sub { ... },
    pre_update => sub { ... },
);

for my $subpkg (qw[org user group foo bar]) {
    my ($method, $code);
    $namespace->{"$subpkg::"}->{$method} = $code
        while ($method, $code) = each %inject;
}

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Makeshifts last the longest.

In reply to Re^2: Not strict (once and only once) by Aristotle
in thread A Perl aptitude test by Jonathan

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