MongoDB Getting Started

Getting Started

• Mongo Shell
• Compass
• Python
• Node.js

下列文档使用mongo shell 来插入数据，展示查询操作.

提前准备

This tutorial requires you to be connected to one of the following:

• MongoDB Atlas Free Tier Cluster. MongoDB Atlas 是一个 快速, 简单, and 免费活动 MongoDB服务的途径. Follow the Create an Atlas Free Tier Cluster tutorial to get started with MongoDB Atlas.
• Local MongoDB installation. 本地安装MongoDB , see Install MongoDB.

插入多个文档

db.collection.insertMany() 可以一次插入多个文档到集合中 documents into a collection.

下列事例插入多个文档到 inventory 集合:

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db.inventory.insertMany([
   // MongoDB adds the _id field with an ObjectId if _id is not present
   { item: "journal", qty: 25, status: "A",
       size: { h: 14, w: 21, uom: "cm" }, tags: [ "blank", "red" ] },
   { item: "notebook", qty: 50, status: "A",
       size: { h: 8.5, w: 11, uom: "in" }, tags: [ "red", "blank" ] },
   { item: "paper", qty: 100, status: "D",
       size: { h: 8.5, w: 11, uom: "in" }, tags: [ "red", "blank", "plain" ] },
   { item: "planner", qty: 75, status: "D",
       size: { h: 22.85, w: 30, uom: "cm" }, tags: [ "blank", "red" ] },
   { item: "postcard", qty: 45, status: "A",
       size: { h: 10, w: 15.25, uom: "cm" }, tags: [ "blue" ] }
]);

insertMany()返回最新插入文档的 _id 值. 

使用db.collection.insertOne() 插入一个文档.

For more information and examples, see Insert Documents in the CRUD section.

查询文档

查询所有文档

使用db.collection.find() 方法，传递空文档作为查询过滤文档，返回所有文档:

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db.inventory.find( {} )

查询指定匹配条件需要传递 {<field>: <value>}给find() ，下列事例返回所有status 等于“D”的文档:

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db.inventory.find( { status: "D" } )

精确匹配内嵌文档

下列返回size等于{ h: 14, w: 21, uom: "cm" }的文档:

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db.inventory.find( { size: { h: 14, w: 21, uom: "cm" } } )

匹配内嵌文档中的一个属性

下列事例返回size内嵌属性uom等于 "in"的所有文档:

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db.inventory.find( { "size.uom": "in" } )

匹配数组中的一个元素

下列事例返回数组tags 包含元素 "red" 的所有文档:

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db.inventory.find( { tags: "red" } )

精确匹配整个数组

下列事例返回数组 tags 有且只有两个元素, "red" 和"blank", 而且是指定的顺序:

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db.inventory.find( { tags: ["red", "blank"] } )

更多信息查看 Query Documents in the CRUD section.

更新、删除查看 Update Documents 和Delete Documents.

Next Steps

Once you complete the Getting Started Guide, you may find the following course and topics useful:

To learn more about the MongoDB query language and other MongoDB fundamentals, sign up for M001: MongoDB Basics.

Introduction	Developers	Administrators	Reference
Introduction to MongoDB Installation Guides Databases and Collections Documents	CRUD Operations Aggregation SQL to MongoDB Indexes	Production Notes Replica Sets Sharded Clusters MongoDB Security	Shell Methods Query Operators Reference Glossary