November 2021
Intermediate to advanced
410 pages
12h 1m
Chinese
Content preview from MongoDB权威指南（第3版）
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25
第 3 章
创建、更新和删除文档
本章介绍将数据移入和移出数据库的基本操作，具体包括以下几个方面：
•
向集合中添加新文档；
•
从集合中删除文档；
•
更新已有的文档。
3.1
插入文档
插入操作是向
MongoDB
中添加数据的基本方法。可以使用集合的
insertOne
方法插入单
个文档：
> db.movies.insertOne({"title" : "Stand by Me"})
insertOne
会为文档自动添加一个
"_id"
键（如果你没有提供的话），并将其保存到
MongoDB
中。
3.1.1
insertMany
如果要向一个集合中插入多个文档，那么可以使用
insertMany
。此方法可以将一个文档数
组传递到数据库。这是一种更加高效的方法，因为代码不会为插入的每个文档去请求数据
库，而是会批量插入它们。
可以在
shell
中尝试以下代码：
> db.movies.drop()
true
> db.movies.insertMany([{"title" : "Ghostbusters"},
... {"title" : "E.T."},
... {"title" : "Blade Runner"}]);
26
｜
第
3
章
{
"acknowledged" : true,
"insertedIds" ...
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