MongoDB 是一个跨平台的,面向文档的数据库,提供高性能,高可用性和可扩展性方便。 MongoDB 工作在收集和文件的概念。

数据库

数据库是一个物理容器集合。每个数据库都有自己的一套文件系统上的文件。一个单一的MongoDB服务器通常有多个数据库。

 

集合

集合是一组MongoDB的文档。它相当于一个RDBMS表。收集存在于一个单一的数据库。集合不执行模式。集合内的文档可以有不同的领域。通常情况下,一个集合中的所有文件是相同或相关的目的。 www.yiibai.com

文档

文档是一组键 - 值对。文件动态模式。动态模式是指,在相同集合中的文档不需要具有相同的字段或结构组的公共字段的集合的文档,可以容纳不同类型的数据。

 

下面给出的表显示RDBMS术语使用 MongoDB 的关系

RDBMSMongoDB
DatabaseDatabase
TableCollection
Tuple/RowDocument
columnField
Table JoinEmbedded Documents
Primary KeyPrimary Key (Default key _id provided by mongodb itself)
数据库服务器和客户端
Mysqld/Oraclemongod
mysql/sqlplusmongo

示例文档

下面给出的示例显示了一个博客网站,这简直是一个逗号分隔的键值对文档结构。

 

{
   _id: ObjectId(7df78ad8902c)
   title: 'MongoDB Overview', 
   description: 'MongoDB is no sql database',
   by: 'yiibai.com',
   url: 'http://www.yiibai.com',
   tags: ['mongodb', 'database', 'NoSQL'],
   likes: 100, 
   comments: [	
      {
         user:'user1',
         message: 'My first comment',
         dateCreated: new Date(2011,1,20,2,15),
         like: 0 
      },
      {
         user:'user2',
         message: 'My second comments',
         dateCreated: new Date(2011,1,25,7,45),
         like: 5
      }
   ]}

_id是一个12字节的十六进制数,保证每一份文件的唯一性。您可以提供_id同时插入文档。如果没有提供,那么MongoDB的每个文档提供了一个独特的ID。这12个字节,前4个字节为当前时间戳,未来3个字节的机器ID,接下来的2个字节的进程id MongoDB的服务器及剩余3个字节是简单的增量值。


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