mongodb findOne 与解释 [英] mongodb findOne with explain

问题描述

在mongodb中可以用explain来做findOne吗?

Is it possible to do findOne with explain in mongodb?

目前我已经尝试过:

db.coll.findOne({query}).explain()
db.collection.findOne({query})._addSpecial( "$explain", 1 )

两者都没有成功.

我知道我可以做限制 1，但是没有它可以做到吗?

I do understand that I can do limit 1, but is it possible to do this without it?

推荐答案

说明完全是游标方法 - https://docs.mongodb.com/manual/reference/method/cursor.explain/#cursor.explain

Explain is completely cursor method - https://docs.mongodb.com/manual/reference/method/cursor.explain/#cursor.explain

根据文档，您不能将游标方法应用于 findOne - https://docs.mongodb.com/manual/reference/method/db.collection.findOne/#the-findone-result-document

According to the documentation, you cannot apply cursor methods to findOne - https://docs.mongodb.com/manual/reference/method/db.collection.findOne/#the-findone-result-document

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