You can reduce 
my $sth = $self->dbh->prepare($sql);
    $sth->execute();
    my $rs = $sth->fetchall_arrayref(
        {
            user_id    => 1,
            username   => 1,
            first_name => 1,
            last_name  => 1
        }
    );
    return $rs;

[download]
To 
return $self->dbh->selectall_arrayref($sql, { Slice => {} });

[download]
Where the return is optional as well.

In reply to Re: Using a better database fetch by Neighbour
in thread Using a better database fetch by Anonymous Monk

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