June 2021
Intermediate to advanced
290 pages
9h 21m
Chinese
Content preview from Node与Express开发（第2版）
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持久化
｜
129
blobService.createBlockBlobFromFile('uploads', filename, __dirname +
'/tmp/' + filename)
更多细节请查看微软的
Azure
的文档。
我们已经了解了文件存储的几项技术，现在考虑结构化数据的存储：使用数据库。
13.3
数据库持久化
除了最简单的网站和
Web
应用，其他的网站和
Web
应用都需要一个数据库。即使你的数
据是二进制的，并且已经在使用共享文件系统或者云存储，很可能你也希望有一个数据库
来帮助归类这些二进制数据。
传统上，
数据库
这个词是
关系型数据库管理系统
（
RDBMS
）
的简称。关系型数据库，比
如
Oracl
e
、
Mysql
、
PostgreSQL
或
SQL Server
，都是以几十年的研究和形式化的数据库理
论为基础的，目前数据库这项技术已经非常成熟，这些数据库的威力也是无可置疑的。然
而，现在我们可以扩展对数据库组成的概念。近年来
NoSQL
数据库成了新风尚
，它们正
在改变互联网数据存储的方式。
声称
NoSQL
数据库要优于关系型数据库是愚蠢的
，但是
NoSQL
数据库也有其优势（关系
型数据库也有）。尽管在
Node
应用中整合关系型数据库已经相当容易
，但
NoSQL
数据库
简直就是为
Node
而生的。
两种最流行的
NoSQL
数据库类型是
文档数据库
和
键值数据库
。文档数据库擅长对象的存
储，这使得它们天然适合于
Node
和
JavaScript
。键值数据库
，正如其名，非常简单，对于
那些数据模式很容易映射成键值对的应用来说是非常好的选择。 ...
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.