Do you have RaiseError on? 

  while (my $idy = $result->fetchrow_hashref()) {
  $idy = $i->{id};

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What is $i? Why is $idy defined twice?

Is there a reason you are trying to reinvent this wheel instead of using DBIx::Tree or DBIx::Tree::NestedSet?

In reply to Re: Hierarchical Tree Traversal by jZed
in thread Hierarchical Tree Traversal by Anonymous Monk

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