Question

我有一个MySQL表，我想从中选择某些列来创建RSS Feed。如何使用Ruby或Rails或Gems做到这一点？

Answer 1

根据我的目的，我可能会选择一个简单的Ruby脚本。我会使用ActiveRecord所以我不必编写任何SQL。然后我会使用Builder或RubyRSS来生成Feed。

直接将ActiveRecord连接到MySQL服务器就像：

require 'active_record'

ActiveRecord::Base.establish_connection(
:adapter => "mysql",
:host => "localhost",
:username => "myusername",
:password => "mypassword",
:database  => "mydb"
)

然后您可以像在常规Rails应用程序中一样定义ActiveRecord模型。

RubyRSS website上有RSS生成器示例，Railscasts website上有一个Builder生成器。

Answer 2

Hernan是对的......这是从数据库中获取数据所需的全部步骤（我将代码移到了步骤下方以便于格式化：

安装ActiveRecord： sudo gem install activerecord
根据hernan43的建议建立连接（最好在单独的文件中，我们称之为“connection.rb”
通过继承ActiveRecord
从表中检索记录，并使用它/它们来填充RSS生成器

您不必将所有内容分成文件...您可以将下面的所有内容放在一个文件中，并删除文件2和3中的“要求”，但这是一个将您的问题分开的常规。方式类似于我所做的。

＃1：file connection.rb

require 'rubygems'
require 'active_record'

ActiveRecord::Base.establish_connection(
  :adapter => "mysql",
  :host => "localhost",
  :database => "appdb",
  :username => "appuser",
  :password => "secret"
)

＃2 filename：singural_rss_table_name.rb 需要'连接'

class SingularRSSTableName < ActiveRecord::Base
  set_table_name 'real_database_table_name' #if the table name is the lowercase, underscore plural of the class name, then you don't need this line.
end

＃3 filename：rss_creator_file.rb

require 'singular_rss_table_name'

# Here you retrieve the rows from your database table, 
# based on the condition that the column 'title' is exactly the text 'article_title'
# there are a lot more options for 
# conditions in ActiveRecord, and you'll probably want to look them up.
records_for_rss_entries = SingularRssTableName.find(:all, :conditions => {:title => 'article_title'})


rss_object = RSS::Maker.new(version) do |feed|
  feed.channel.title = "Example Ruby RSS feed"

  records_for_rss_entries.each do |entry_record|  # here we're iterating through
                                                  # each of the rows we found.
    entry = feed.items.new_item
    entry.title = entry_record.title # at this point, each 'entry_record' is a row in your db table
                                     # use the dot (.) operator to access columns in the table.

    ...
  end  

end

这个答案的内容部分答案来自：

http://rubyrss.com/

和

http://www.agileadvisor.com/2008/01/using-activerecord-outside-rails.html

使用Ruby或Rails或Gems从MySQL表中提供RSS

2 个答案: