Mongodb字段不为null删除

Question

如何删除字段值不为空的集合中的所有文档？基本上MySql查询版本是这样的:

// MySql query
DELETE FROM companies WHERE createdBy != NULL

// What I tried but did not work.
$this->mongo->companies->remove(array('createdBy' => true));

我甚至不知道是否有可能,如果有人能帮助我,我会很感激;)

谢谢 :)

Answer 1

您可以通过不相等的运算符轻松完成:

db.companies.find( { createdBy : { $ne : null } } );