mongodb key的意思|示意

Note in Listing 6 that MongoDB created an id for each document, as signified by the _id key.

请注意在清单6中MongoDB为每一个文档都创建了一个id，如_ id键所示。

MongoDB is a lot more than just a basic key/value store. Let's take a brief look at some of its other features

MongoDB 不仅仅是一个基本的键/值对存储数据库，让我们简单地看一下它的其他特性

For example, type connect and hit the return key, and you will see the source code used to connect to a MongoDB database.

例如，输入connect后按回车键，您将看到用于连接MongoDB数据库的源代码。