/**
* Deletes all descendants for the given node
* Instance pooling is wiped out by this command,
* so existing Causadiferido instances are probably invalid (except for the current one)
*
* @param PropelPDO $con Connection to use.
*
* @return int number of deleted nodes
*/
public function deleteDescendants(PropelPDO $con = null)
{
if ($this->isLeaf()) {
// save one query
return;
}
if ($con === null) {
$con = Propel::getConnection(CausadiferidoPeer::DATABASE_NAME, Propel::CONNECTION_READ);
}
$left = $this->getLeftValue();
$right = $this->getRightValue();
$scope = $this->getScopeValue();
$con->beginTransaction();
try {
// delete descendant nodes (will empty the instance pool)
$ret = CausadiferidoQuery::create()->descendantsOf($this)->delete($con);
// fill up the room that was used by descendants
CausadiferidoPeer::shiftRLValues($left - $right + 1, $right, null, $scope, $con);
// fix the right value for the current node, which is now a leaf
$this->setRightValue($left + 1);
$con->commit();
} catch (Exception $e) {
$con->rollback();
throw $e;
}
return $ret;
}
/**
* Update the tree to allow insertion of a leaf at the specified position
*
* @param int $left left column value
* @param integer $scope scope column value
* @param mixed $prune Object to prune from the shift
* @param PropelPDO $con Connection to use.
*/
public static function makeRoomForLeaf($left, $scope, $prune = null, PropelPDO $con = null)
{
// Update database nodes
CausadiferidoPeer::shiftRLValues(2, $left, null, $scope, $con);
// Update all loaded nodes
CausadiferidoPeer::updateLoadedNodes($prune, $con);
}
