MongoDB权威指南<2> 1-1 MongoDB 介绍

Char01 MongoDB简介

1.1 易于使用

　　是面向文档document-oriented的数据库

1.2 易于扩展

　　MongoDB的设计采用横向扩展，如果一个集群需要更大的容量，只需要向集群添加新的服务器，MongoDB 就会自动将现有的数据像服务器传送

1.3 丰富的功能

　　索引 indexing 

　　聚合 aggregation

　　特殊的集合类型

　　文档存储

1.4 卓越的性能

Char02 MongoDB基础知识

 2.1 文档 -- 行

　　文档被表示为对象

      键可以使用任意UTF-8字符

      MongoDB不但区分类型，而且区分大小写

      MongoDB文档不能有重复的键

　　{"greeting":"hello ... "}

2.2 集合 -- 表 【一组文档】

2.2.1 动态模式：

　　集合是动态模式

2.2.2 命名

2.3 数据库

　　数据库名应该全部小写，

　　数据库最终会变成文件系统里的文件，而数据库名就是相应的文件名

2.4 启动 MongoDB

　　默认端口好28017

2.5 MongoDB Shell 简介

2.5.1 MongoDB自带JavaScript shell

2.5.2 MongoDB 客户端

2.5.3 Shell 操作

 CRUD : create , read , update, delete 

# mongo
MongoDB shell version: 3.0.14
connecting to: test
2017-01-19T15:55:15.814+0800 W NETWORK  Failed to connect to 127.0.0.1:27017, reason: errno:111 Connection refused
2017-01-19T15:55:15.814+0800 E QUERY    Error: couldn't connect to server 127.0.0.1:27017 (127.0.0.1), connection attempt failed
    at connect (src/mongo/shell/mongo.js:179:14)
    at (connect):1:6 at src/mongo/shell/mongo.js:179
exception: connect failed
root@Ly-banya:~# 
root@Ly-banya:~# mongo
MongoDB shell version: 3.0.14
connecting to: test
2017-01-19T15:55:28.999+0800 W NETWORK  Failed to connect to 127.0.0.1:27017, reason: errno:111 Connection refused
2017-01-19T15:55:29.000+0800 E QUERY    Error: couldn't connect to server 127.0.0.1:27017 (127.0.0.1), connection attempt failed
    at connect (src/mongo/shell/mongo.js:179:14)
    at (connect):1:6 at src/mongo/shell/mongo.js:179
exception: connect failed
root@Ly-banya:~# ls
ls           lsattr       lsblk        lsb_release  lscpu        lsdiff       lshw         lsinitramfs  lsmod        lsof         lspci        lspcmcia     lspgpot      lss16toppm   lsusb
root@Ly-banya:~# lsof -i:27017
COMMAND   PID    USER   FD   TYPE   DEVICE SIZE/OFF NODE NAME
mongod  25779 mongodb    6u  IPv4 28934926      0t0  TCP localhost:27017 (LISTEN)
root@Ly-banya:~# ^Cof -i:27017
root@Ly-banya:~# kill -9 ^C
root@Ly-banya:~# exit
ly@Ly-banya:~$ mongo
MongoDB shell version: 3.0.14
connecting to: test
Welcome to the MongoDB shell.
For interactive help, type "help".
For more comprehensive documentation, see
	http://docs.mongodb.org/
Questions? Try the support group
	http://groups.google.com/group/mongodb-user
Server has startup warnings: 
2017-01-19T15:55:44.532+0800 I CONTROL  [initandlisten] 
2017-01-19T15:55:44.532+0800 I CONTROL  [initandlisten] ** WARNING: /sys/kernel/mm/transparent_hugepage/enabled is 'always'.
2017-01-19T15:55:44.532+0800 I CONTROL  [initandlisten] **        We suggest setting it to 'never'
2017-01-19T15:55:44.532+0800 I CONTROL  [initandlisten] 
2017-01-19T15:55:44.532+0800 I CONTROL  [initandlisten] ** WARNING: /sys/kernel/mm/transparent_hugepage/defrag is 'always'.
2017-01-19T15:55:44.532+0800 I CONTROL  [initandlisten] **        We suggest setting it to 'never'
2017-01-19T15:55:44.532+0800 I CONTROL  [initandlisten] 
> 
> db
test
> use foobar
switched to db foobar
> db
foobar
> post={"title":"Blog Post",
...     "content":"This is Content",
...      "date":new Date()}
{
	"title" : "Blog Post",
	"content" : "This is Content",
	"date" : ISODate("2017-01-19T07:57:57.398Z")
}
> db.blog.find()
> db.blog.insert(post)
WriteResult({ "nInserted" : 1 })
> db.blog.find()
{ "_id" : ObjectId("5880719675f14a9225e239f8"), "title" : "Blog Post", "content" : "This is Content", "date" : ISODate("2017-01-19T07:57:57.398Z") }
> post.comments = []
[ ]
> db.blog.update({"title":"Blog Post"} , post)
WriteResult({ "nMatched" : 1, "nUpserted" : 0, "nModified" : 1 })
> db.blog.find()
{ "_id" : ObjectId("5880719675f14a9225e239f8"), "title" : "Blog Post", "content" : "This is Content", "date" : ISODate("2017-01-19T07:57:57.398Z"), "comments" : [ ] }
> 
> db.log.remove({"title":"Blog Post"})
WriteResult({ "nRemoved" : 0 })
> db.blog.find()
{ "_id" : ObjectId("5880719675f14a9225e239f8"), "title" : "Blog Post", "content" : "This is Content", "date" : ISODate("2017-01-19T07:57:57.398Z"), "comments" : [ ] }
> db.blog.remove({"title":"Blog Post"})



> db.blog.remove({"title":"Blog Post"})
WriteResult({ "nRemoved" : 1 })
> db.blog.find()

　　

2.6 数据类型

2.6.1 基本数据类型

2.6.2 日期

2.6.4 内嵌文档

2.6.5 _id && ObjectId

2.7 使用 MongoDB shell