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POMove node in a nested set
 

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    <p>I'm trying to use the answer here : <a href="https://stackoverflow.com/questions/889527/mysql-move-node-in-nested-set">Move node in nested set</a></p> <p>To move a node in a mysql nested set db it appears to work ok except the moving node is set to a negative value and is never changed to the new lft &amp; rgt values. It appears as if Step 4 is not doing anything at all. I've changed the script to match my structure and removed the update parentID in step 4 because I don't store the parentID in my structure.</p> <p>Can someone tell me why this is not working? here is my code :</p> <pre><code>// id of moving node $iItemId = 13; // left position of moving node $iItemPosLeft = 19; // right position of moving node $iItemPosRight = 20; // id of new parent node (where moving node should be moved) $iParentId = 8; // right position of new parent node (where moving node should be moved) $iParentPosRight = 15; // 'size' of moving node (including all its sub-nodes) $iSize = $iItemPosRight - $iItemPosLeft + 1; $sql = array( // step 1: temporarily "remove" moving node 'UPDATE `RJF_storeNestedCategory` SET `lft` = 0-(`lft`), `rgt` = 0-(`rgt`) WHERE `lft` &gt;= "'.$iItemPosLeft.'" AND `rgt` &lt;= "'.$iItemPosRight.'"', // step 2: decrease left and/or right position values of currently 'lower' items (and parents) 'UPDATE `RJF_storeNestedCategory` SET `lft` = `lft` - '.$iSize.' WHERE `lft` &gt; "'.$iItemPosRight.'"', 'UPDATE `RJF_storeNestedCategory` SET `rgt` = `rgt` - '.$iSize.' WHERE `rgt` &gt; "'.$iItemPosRight.'"', // step 3: increase left and/or right position values of future 'lower' items (and parents) 'UPDATE `RJF_storeNestedCategory` SET `lft` = `lft` + '.$iSize.' WHERE `lft` &gt;= "'.($iParentPosRight &gt; $iItemPosRight ? $iParentPosRight - $iSize : $iParentPosRight).'"', 'UPDATE `RJF_storeNestedCategory` SET `rgt` = `rgt` + '.$iSize.' WHERE `rgt` &gt;= "'.($iParentPosRight &gt; $iItemPosRight ? $iParentPosRight - $iSize : $iParentPosRight).'"', // step 4: move node (ant it's subnodes) and update it's parent item id 'UPDATE `RJF_storeNestedCategory` SET `lft` = 0-(`lft`)+'.($iParentPosRight &gt; $iItemPosRight ? $iParentPosRight - $iItemPosRight - 1 : $iParentPosRight - $iItemPosRight - 1 + $iSize).', `rgt` = 0-(`rgt`)+'.($iParentPosRight &gt; $iItemPosRight ? $iParentPosRight - $iItemPosRight - 1 : $iParentPosRight - $iItemPosRight - 1 + $iSize).' WHERE `lft` &lt;= "'.(0-$iItemPosLeft).'" AND i.`rgt` &gt;= "'.(0-$iItemPosRight).'"'); foreach($sql as $sqlQuery){ mysql_query($sqlQuery); } </code></pre> <p>I'm also interested if anyone knows how to use this to move a node left or right within its existing parent.</p>
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    1. COFound the problem with this there was a rogue i. in the last query should have read: WHERE `lft` <= "'.(0-$iItemPosLeft).'" AND `rgt` >= "'.(0-$iItemPosRight).'"');
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    2. COStill want to know if anyone can help me use this to move a node left or right inside the current parent though. Thanks!
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    3. COTo use the same query to move a node left or right just substitute the left value of the node you want the moving node to appear before as the $iParentPosRight value.
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