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POCopy tree structure recursive - Adjacency List Model
 

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  1. POCopy tree structure recursive - Adjacency List Model
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    <p>I try to copy a tree structure from one database table to another. The structure is an Adjacency List Model. It looks like:</p> <pre><code>id|parent_id|position 1|0|1 2|1|1 3|1|2 4|0|2 5|4|1 </code></pre> <p>It is <strong>necessary</strong> that the id's are regenerated (autoinc) in the other table! I have the following functions:</p> <pre><code>/** * Copy a single node and return the new id */ public function copyNode($sn_data){ $this-&gt;db2-&gt;insert('items_configurations', $sn_data); return $this-&gt;db2-&gt;insert_id(); } /** * Return a list of child nodes as an assoziative array * from a given parent */ public function childList($parent_id){ $tmp = 'SELECT parent_id,item_id,template_id,position FROM items_templates WHERE parent_id='.$parent_id; $tmp .= ' ORDER BY position'; $query=$this-&gt;db2-&gt;query($tmp); return $query-&gt;result_array(); } /** * Copy the whole tree structure through an recursive function */ public function copyTree($node_data,$given_parent){ $new_parent = $this-&gt;copyNode($node_data); $new_data = $this-&gt;childList($node_data['id']); if(is_array($new_data)){ foreach($new_data as $new_node_data) : $new_node_data['parent_id'] = $given_parent; $new_node_data['configuration_id'] = $node_data['configuration_id']; $this-&gt;copyTree($new_node_data,$new_parent); endforeach; } } /** * First call of the function for example: */ $this-&gt;copyTree(array('parent_id' =&gt; 0,'item_id' =&gt; 40,'template_id' =&gt; 6,'position' =&gt; 1),0); </code></pre> <p>I want to do it recursive, but it only copies the first two lines. Where is the mistake?</p>
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