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简介

MongoDB的mongo来源于单词humongous（其大无比的），它是一个开源免费的跨平台的面向文档的数据库。作为NoSQL数据库的一个代表，MongoDB区别于传统的以表结构为中心的关系性数据库，MongoDB更青睐于类似JSON写法的可动态变化schema的文档结构（MongoDB中称这种结构为BSON），JSON文件本身无需类似DB的schema即可被理解，这种方式使得不少类型的应用开发使用mongodb后更加简单和快捷。

License

MongoDB现由MongoDB Inc.公司开发，基于GPL和Apache License的组合。

发展轨迹

• 2007年 一家叫做10gen的公司开始开发MongoDB作为其PAAS的组成部分。
• 2009年，10gen迁移到开源开发，同时提供商业支持和其他服务。
• 2013年，10gen正式更名为MongoDB Inc.

MongoDB的特点

区别于传统的关系型数据库，mongodb比较突出的特点比如：

概念Mapping

MongoDB的安装和使用

初试mongodb

连接到mongodb

[root@host31 ~]# docker pull mongoUsing default tag: latestlatest: Pulling from library/mongo5c68a10e9f3f: Pull complete0110f95fa9c8: Pull complete0cba4a42bc41: Pull completea6eafd7fba3f: Pull complete703d9d7e0e21: Pull complete6c18d5bc22c9: Pull completefd3fcba178e3: Pull completec8b9b5488049: Pull complete41f37d58ab4c: Pull completeDigest: sha256:beff97308c36f7af664a1d04eb6ed09be1d14c17427065b2ec4b0de90967bb3fStatus: Downloaded newer image for mongo:latest[root@host31 ~]#[root@host31 ~]# docker run -d --name=mongo mongob2426160fd48b9614636c3466b8d6804f00a0c1d26373e1b7a37991e648f3e3b[root@host31 ~]# docker exec -it mongo /bin/bashroot@b2426160fd48:/#

连接mongo

root@b2426160fd48:/# mongoMongoDB shell version: 3.2.9connecting to: testWelcome 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-userServer has startup warnings:2016-08-27T23:58:55.597+0000 I CONTROL  [initandlisten]2016-08-27T23:58:55.597+0000 I CONTROL  [initandlisten] ** WARNING: /sys/kernel/mm/transparent_hugepage/enabled is 'always'.2016-08-27T23:58:55.597+0000 I CONTROL  [initandlisten] **        We suggest setting it to 'never'2016-08-27T23:58:55.597+0000 I CONTROL  [initandlisten]2016-08-27T23:58:55.597+0000 I CONTROL  [initandlisten] ** WARNING: /sys/kernel/mm/transparent_hugepage/defrag is 'always'.2016-08-27T23:58:55.597+0000 I CONTROL  [initandlisten] **        We suggest setting it to 'never'2016-08-27T23:58:55.597+0000 I CONTROL  [initandlisten]>

help命令

> help        db.help()                    help on db methods        db.mycoll.help()             help on collection methods        sh.help()                    sharding helpers        rs.help()                    replica set helpers        help admin                   administrative help        help connect                 connecting to a db help        help keys                    key shortcuts        help misc                    misc things to know        help mr                      mapreduce        show dbs                     show database names        show collections             show collections in current database        show users                   show users in current database        show profile                 show most recent system.profile entries with time >= 1ms        show logs                    show the accessible logger names        show log [name]              prints out the last segment of log in memory, 'global' is default        use 
   
                    set current database        db.foo.find()                list objects in collection foo        db.foo.find( { a : 1 } )     list objects in foo where a == 1        it                           result of the last line evaluated; use to further iterate        DBQuery.shellBatchSize = x   set default number of items to display on shell        exit                         quit the mongo shell>
   

显示db列表

> show dbslocal  0.000GB>

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