特定搜索的MongoDB统计信息 [英] MongoDB Stats for a particular search

问题描述

我想在MongoDB外壳中找到一个函数，该函数可以让我查看特定查询中有多少个项目.

I'd like to find a function within the MongoDB shell that will let me see how many items are in a particular query.

例如，我想做些类似的事情:

For instance, I want to do something akin to:

 db.collection.find({category: "Cupcakes"}).stats()

看看数量，文件大小之类的东西.

and see count, file size, that sort of thing.

在MongoJS和MongoDb的其他前端实现中，查询返回一个对象，您可以在该对象上执行.length方法，例如:

In MongoJS and other front-end implementations of MongoDb a query returns an object that you can perform a .length method on, like:

 db.collection.find({category: "Cupcakes"}, function(err, records){
       console.log(records.length); // Shows how many records are in the search field
 });

有什么办法可以在Shell本身中做类似的事情?会非常有用，但我找不到任何文档或任何提及此的地方.

Any way to do something similar in the shell itself? Would be insanely useful but I can't find any docs or mention anywhere of this.

推荐答案

此函数为.

This function is count(). All you need is to do: db.collection.find({category: "Cupcakes"}).count().

或者如Stennie所指出的，您也可以使用db.collection.count({category: "Cupcakes"})

Or as pointed by Stennie you can also use db.collection.count({category: "Cupcakes"})

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