Ruby下解决oci8安装错误的问题
Prepare
1. Download 'OCI 1.x.x.rb' (it's VERY important - execution MUST be *.rb)
2. Download 'oci8lib.so'
Install
1. Copy 'OCI8.rb' to .../ruby/lib/ruby/site_ruby/1.8/DBD/OCI8
2. Copy 'oci8.rb' to .../ruby/lib/ruby/site_ruby/1.8
3. Copy 'oci8lib.so' to .../ruby/lib/ruby/site_ruby/1.8/i386-msvcrt
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开发环境:
OS:Windows XP
Ruby:Ruby1.9.1
Rails:Rails2.3.5
will_paginate:will_paginate2.3.11
(在命令行中运行 gem install mislav-will_paginate --source http://gems.github.com )
IDE:Rubymine2.0.1
DB:mysql5.0.9
本例在上一个例子(Ruby实践—简单数据库操作)的基础上实现分页,利用的是will_p ......
使用 will_paginate 进行分页和简单查询
在命令行下使用 gem install will_paginate 命令,出现下面结果安装成功
打开 books_controller.rb (你自己的控制器)
注释掉查找全部的方法,使用下面的方法,已经集成根据title进行查询
Ruby代码
#@books = Book.all
@books = Book.pagina ......
ruby常规访问access数据库的方法应该是使用DBI库
:
require 'dbi'
DBI.connect("DBI:ADO:Provider=Microsoft.Jet.OLEDB.4.0;Data Source=db.mdb;")
可是
简单尝试之后没能成功,提示找不到驱动器ADO,懒得再试,遂找其他方法。
一番搜索之后,发现可以用WIN32OLE来访问access,写一个简单的类包装之:
......
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 ......
http://www.robertsosinski.com/2008/12/21/understanding-ruby-blocks-procs-and-lambdas/
Understanding Ruby Blocks, Procs and Lambdas
Blocks, Procs and lambdas (referred to as closures
in Computer Science) are one of the most powerful aspects of Ruby, and
also one of the most misunderstood. This ......