如何使用教义在单个查询中获取整个树?

How can I fetch the entire tree in a single query with doctrine?(如何使用教义在单个查询中获取整个树?)

问题描述

此片段来自 官方网站按预期工作:

This snippet from official website works as expected:

$treeObject = Doctrine::getTable('Category')->getTree();
$rootColumnName = $treeObject->getAttribute('rootColumnName');

foreach ($treeObject->fetchRoots() as $root) {
  $options = array(
      'root_id' => $root->$rootColumnName
  );
  foreach($treeObject->fetchTree($options) as $node) {
    echo str_repeat(' ', $node['level']) . $node['name'] . "
";
  }
}

但我看到有几十个查询发送到数据库.

But I see there are dozens of queries sent to database.

一口怎么办?

推荐答案

试试这个:

Doctrine_Core::getTable('YourTableWithTree')->createQuery('tree')
    ->addOrderBy('tree.root_id ASC')
    ->addOrderBy('tree.lft ASC');

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