使用Drush php脚本删除节点

Question

我正在尝试使用Drush删除基于其标题的Drupal节点。

我正在调用的delete_poi.php脚本如下所示：

<?php
// get the name of the POI that is entered with the Drush command
$poi_title = drush_get_option('poi');

// query the database for the node with type poi and title poi_title and delete it
$sql = db_query("SELECT nid FROM node WHERE title = '" . $poi_title . "';");
while ($node = db_fetch_object($sql)) {
   node_delete($node->nid);
   drush_print('deleted poi ' . $node->title);
}

我正在使用的Drush命令是：

drush scr delete_poi.php --poi='Historium'

运行脚本时，我得到以下输出（我也尝试过使用php脚本）：

Drush command terminated abnormally due to an unrecoverable error.                                                                                       
Error: Call to undefined function db_query() in /vagrant/site/delete_poi.php, line 6

我一直在关注脚本https://coderwall.com/p/stbxbw的本教程，并一直在Drupal论坛和Stackexchange中搜索答案，但一直无法找到解决方案。

我猜测引导Drupal存在问题，因为无法识别Drupal API（如db_query）的方法。当我尝试使用drush en module_name启用模块时，出现以下错误：

Command pm-enable needs a higher bootstrap level to run - you will need invoke drush from a more functional Drupal environment to run this command.
The drush command 'en delete_all' could not be executed.                                                             
A Drupal installation directory could not be found       

你有什么想法吗？如果您需要更多信息，请告诉我。