I'm not sure how to do this via meta ... but isn't this kinda what the BUILD method should be used for?

package GSM::Cell;
use Moose;
use MooseX::AttributeHelpers;
use Data::Dumper;

has 'BCCH' => (is => 'rw');
has 'LAC'  => (is => 'ro', required => 1);
has 'CI'   => (is => 'ro', required => 1);
has 'NAME' => (is => 'rw', lazy => 1, default => &set_name);
has 'ID'   => (is => 'ro', lazy => 1, default => \&set_id);

with qw(SQLConnection);

...

sub BUILD {
  my $self = shift;
  my $sth  = $self->dbh->prepare('select BCCHFrequency from Cell where
+ CI = ? and LAC = ?);
     $sth->execute($self->CI,$self->LAC);
  $self->BCCH( $sth->fetchrow_array );
}
...
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