在Ruby把MySQL做NoSQL用 Friendly简介

[url=http://github.com/jamesgolick/friendly]Friendly[/url]是一个github上的一个插件，起源是因为FriendFeed把MySQL做NoSQL的用，具体参见这篇：
[url]http://bret.appspot.com/entry/how-friendfeed-uses-mysql[/url]


Friendly就是这样的作用，把MySQL变成一个文件数据库来用。NoSQL日趋狂热，schemaless是其中一个原因。客户端的改变可以将MySQL达到同样目的。下面是简单的介绍：


[size=large]安装friendly[/size]

	sudo gem install friendly

[size=large]在Rails里[/size]

	#environment.rb:
    config.gem "friendly"

#and create a config/friendly.yml:

	development:
	  :adapter:  "mysql"
	  :host:     "localhost"
	  :user:     "root"
	  :password: "swordfish"
	  :database: "friendly_development"

没有使用Rails:

	Friendly.configure :adapter  => "mysql",
	                   :host     => "localhost",
	                   :user     => "root",
	                   :password => "swordfish",
	                   :database => "playing_with_friendly"

[size=large]创建Model[/size]

	class BlogPost
	  include Friendly::Document

	  attribute :author, String
	  attribute :title,  String
	  attribute :body,   String
	end

[size=large]创建Table[/size]

#script/console:

	Friendly.create_tables!

[size=large]索引[/size]

	class BlogPost
	  include Friendly::Document

	  attribute :author, String
	  attribute :title,  String
	  attribute :body,   String

	  indexes :author
	  indexes :created_at
	end     

#Run create_tables again and the index tables will be created for you.
	Friendly.create_tables!

[size=large]创建Objects[/size]

#With familiar ActiveRecord syntax:
	BlogPost.create :author => "James Golick",
	                :title  => "Friendly has familiar syntax.",
	                :body   => "So, there's very little learning curve."

[size=large]查询[/size]

	BlogPost.all(:author => "James Golick")

#Most recent posts:

	BlogPost.all(:order! => :created_at.desc)

[size=large]
缓存[/size]

#Install the memcached gem:

	sudo gem install memcached

#配置 Friendly:

	Friendly.cache = Friendly::Memcached.new(Memcached.new)

#Configure your model to cache:

	class BlogPost
	  include Friendly::Document

	  attribute :author, String
	  attribute :title,  String
	  attribute :body,   String

	  indexes :author
	  indexes :created_at

	  caches_by :id
	end