MongoDB 从 shell 中删除 GridFS 对象
我使用 GridFS 将文件存储在 MongoDB 中。我需要从 JavaScript shell 中按 ID 删除其中一些文件。我需要使用它的 ID 删除单个文件。我想我可以这样做：
db.fs.files.remove({_id: my_id});
这在某种程度上有效；它从 fs.files 集合中删除文件，但不会从 fs.chunks 集合中删除块本身。我之所以知道这一点是因为我在 RockMongo 中检查了前后两个集合的长度。
我可以遍历这些块并删除那些引用该文件的块，但是有没有更好的内置方法来做到这一点？
I have files stored in a MongoDB using GridFS. I need to remove some of those files by ID, from the JavaScript shell. I need to remove a single file using it's ID. I figured I could just do this:
db.fs.files.remove({_id: my_id});
This works to some extent; it removes the file from the fs.files collection but does not remove the chunks itself from the fs.chunks collection. The reason I know that is because I check the length of both collections before and after in RockMongo.
I could go through the chunks and remove those that are referring to that file, but is there a better, built-in way of doing that?
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您可以通过从 shell 中删除块和文件来删除 gridFS 文件。例如
那些命令就会做这样的事情。
You can delete gridFS file by deleting both chunks and files from shell. for example
Those commands will do such trick.
您想使用 db.fs.delete(_id); 来代替。
更新
抱歉，这显然无法在 shell 中运行，只能通过驱动程序运行。 GridFS 是由驱动程序实现的存储规范。看起来它没有太多来自 shell 的内置功能。
更新2 还有一个命令行工具，mongofiles (http://www.mongodb .org/display/DOCS/GridFS+Tools），它允许您按名称删除文件。
mongofiles 删除<文件名>。它附带一个警告，表示它将删除该名称的所有文件，因此它不像 id 那样精细。You want to use
db.fs.delete(_id);instead.Update
Sorry, that apparently doesn't work from the shell, only through the driver. GridFS is a specification for storage implemented by the drivers. Looks like it doesn't have much built-in functionality from the shell, as such.
Update 2 There is also a command line tool, mongofiles (http://www.mongodb.org/display/DOCS/GridFS+Tools), which allows you to delete files by name.
mongofiles delete <filename>. It comes with a warning that it will delete all of the files by that name, so it's not as granular as by id.参考这个页面：
http://docs.mongodb.org/manual/reference/program /mongofiles/#bin.mongofiles
refer to this page:
http://docs.mongodb.org/manual/reference/program/mongofiles/#bin.mongofiles