Install Cassandra with Ruby 1.9.1 on Windows
To get it done is not easy. I spent a whole day to figure out the various compatibility issues along the way out.
Now there still might be potential issues, but it works by my rough test.
Step 1: Install Apache Cassandra
You may know that the Ruby gem cassandra will do it for you.
To me, I simply want to keep Cassandra independent from Ruby stuff, to ease the upgrade and administration.
Refer to my blog "Setup Cassandra on Windows"
(http://blog.csdn.net/goodxp/archive/2010/02/26/5327732.aspx) for details.
Step 2: Install Thrift (0.2.0)
If you do "gem install cassandra", it should install thrift automatically (being a dependency).
However, there is a compatibility issue on thrift with Ruby 1.9, so to fail Cassandra gem installation.
It will be better to install thrift first and fix it before installing cassandra gem.
Refer to my blog "fix thrift 0.2.0 installation with ruby 1.9.1"
(http://blog.csdn.net/goodxp/archive/2010/02/28/5333145.aspx) for details.
Step 3: Install gem Cassandra
This part is easy:
$ gem install cassandra
Do NOT do this: "$ cassandra_helper cassandra". It does not work.
I did not dig deeper since I already have a working up-to-date version of Cassandra 0.5.0 installed.
Switch to Cassandra bin folder and start cassandra server:
$ cassandra -f
Open another command console window:
$ irb
irb> require 'rubygems'
irb> require 'cassandra'
If you see a warning pop-up window asking for "msvcrt-ruby18.dll", do this:
irb> quit
$ gem uninstall json
Don't worry, Ruby 1.9 has a good json support.
Now run irb again as above, and then:
irb> include Cassandra::Constants
irb> db = Cassandra.new 'Keyspace1'
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class Tree
def initialize
puts "Make a normal tree"
end
def decorate
puts "Make sure the tree won\'t fall"
end
end
class RedBalls < Tree
def initialize(tree)
@parent = tree;
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@parent.decorate
puts "Put on some red balls"
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......
原文连接： http://hi.baidu.com/%B7%CF%B2%C5%CB%FB%B8%E7/blog/item/09c19411244152daf7039ec4.html
通过命令行查看ruby版本信息：
ruby -v
命令行运行程序：
方法1.
ruby -e 'print "hello ruby"'
-e 表示将后面的一行作为ruby程序
print 是ruby的一个内置函数
方法2.交互编译环境
irb （命令行输入后， ......
#一、模块定义及引用，模块就是一段代码，里面有一些方法放一起。
#定义模块用module...end 。模块与类非常相似，但是：
#A) 模块不可以有实例对象；
#B) 模块不可以有子类。
include Math
puts sqrt(91);
module Me
def sqrt(a)
puts a*a;
return a*a;
end
PI=3.1415926 ......
When I try the command "gem install thrift" with Ruby 1.9.1, I got a compilation error with something related to a C function "strlcpy()".
Then I searched the web. It seems I am not alone and the community know it.
However I do not want to wait for official update, I want to ......
