Cassandra in Action with Twitter's Ruby Client
有一个全新的项目，因为考虑到将来的数据扩展性能，所以考虑用Cassandra做数据存储，前端用Lighttpd + FastCGI + Rails。在使用Cassandra的时候，觉得有一些东西可能大家都需要，就写了一个简单的指南。因为内容比较长（16页），就弄了个PDF文件给大家下载。
Cassandra in Action with Twitter's Ruby Client.pdf
如果下载链接有问题，请给我邮件：spanzhang@gmail.com。需要说明一下的是，这个指南是用英语写的，不过都是些很简单的句子，相信有四级英语就可以毫不费力的看明白。下面把文章的引文放这里，供大家参考，你可以看看适不适合你的需要：
Okay, let me get something straight. I’m not going to persuade you to use Cassandra. I just assume you have already chosen Cassandra as your storage solution. Maybe you know the basic things, the underneath mechanisms, about Cassandra or maybe not. Anyway, I assume you don’t care what makes Cassandra outstanding and you just want to use it. If that’s the case, this tutorial is going to help you, in these 3 aspects:
1) to set up the environment correctly,
2) to understand how to model you data in a Cassandra way,
3) to understand and use Twitter’s Cassandra Ruby client.
After reading this tutorial, you should have a working environment and can start your project with a good understanding of doing your job in a very Cassandra way. Here we go!
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开发环境：
Ruby:1.9.1
Rails:2.3.5
Rake:0.8.7
Rack:1.0.1
Mysql:5.0.9
Ruby-mysql:mysql-2.8.1-x86-mswin
IDE:RubyMine2.0.1
数据库准备：
database:dbdevelopment
user:crystal
password:crystal
一、创建Ruby项目RorTest
二、修改database.yml
这里只启用development环境数据库，修改配置文件如下：
dev ......
RESTful的化身----resource
当然，光把RESTful和resource扯到一起似乎相当狭义，在Rails中，ActionController::Resources抽象了REST中的Resource，这里，我不谈REST的相关概念，网上资料一大坨。我们就来看看Rails中是如何通过Resource来轻松，简便的完成RESTful应用的吧。
resources.rb
源代码� ......
require 'open-uri'
$NAME_CHARS= (?a..?z).to_a+(?0..?9).to_a
def is_name_used(name)
str=open('http://passport.csdn.net/UserExist.aspx?UserName='+name)
str=str.read
#str=str.encode('GBK','utf-8')
return true if str[/Red/]
end
def enum_names(len=2)
return if len<2
f=File.open(' ......
Ruby 类的继承
关键字: Ruby 类的继承
一、普通方式的继承
Ruby只支持单继承
ruby 代码
class
Child < Father
......
end
Object是所有类的始祖，并且Object的实例方法 ......
Watir 语法（Web Application Testing in Ruby)
# watir的安装
watie的安装请查看 -> Ruby library的安装
# 使用Watir工具，需要在脚本中加上
require 'watir'
# 创建一个IE的实例
ie = Watir::IE.new
或者在创建的同时直接转到页面
ie = Watir::IE.start('http://www.text.com/')
Watir使用start方法 ......
