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note Oracle does offer versions of its database systems for free, but they are only to be used for development purposes.

class CreateRegistrations < ActiveRecord::Migration def self.up create_table :registrations do |t| t.column :user_id, :integer t.column :event_id, :integer t.column :note, :string, :length => 400 t.column :created_at, :datetime end end def self.down drop_table :registrations end end

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As with the other database systems, access to Oracle databases is provided through a library, in this case called OCI8. Oracle has provided a great tutorial on its web site that s specific to getting Ruby connected to Oracle databases, and that should be suitable for anyone familiar with Oracle databases. For more information, see http://www.oracle.com/technology/pub/articles/ haefel-oracle-ruby.html. You can use the OCI8 library through the database-agnostic DBI system, as covered in a following section.

You may wonder what happens if you try to save a new article without giving it any information. Try doing that: Rails doesn t care. Actually, it s the Article model that doesn t care. This is because in Rails, the rules for data integrity (such as required fields) are the responsibility of the model.

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Microsoft SQL Server (sometimes known as MS SQL Server) is Microsoft s relational database management system software, and is the primary database server used on Microsoft platforms (although most of the other systems covered in the past few sections work on Windows, too). The way you connect to Microsoft SQL Server can vary depending on what operating system your script is running under. For example, at the time of writing, on Windows, you can use ActiveX Data Objects (ADO) with WIN32OLE to connect directly to the server. On OS X, you can use iODBC. On Linux and other Unix-related platforms, you can use unixODBC. However, connecting to SQL Server from Ruby is an uncommon task, and the drivers are changing on a regular basis, so the best references are tutorials and blog posts found online. Use your favorite search engine to search for ruby ms sql or ruby microsoft sql server, and you ll find several useful resources. At the time of writing, these pages provide the best instructions for approaching SQL Server from Ruby: http://snippets.dzone.com/posts/show/2236 http://www.sapphiresteel.com/Using-SQL-Server-With-A-Rails http://wiki.rubyonrails.org/database-support/ms-sql

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To keep things simple, we re just going to allow people to add a note whenever they want to attend an event. For instance, someone might want to say Can t wait to be there! I m so excited! or Is packagethief coming Let s update our models with what we need. Add the code snippets shown in Listings 5-14, 5-15, and 5-16 to the relevant models.

If you decide to take the DBI route, read the following section for information on how to use Ruby s DBI library.

To add basic validation for required fields, open the Article model in app/models/article.rb, and add the validation method shown in Listing 3-5 inside the class body. Listing 3-5. Validation Added to the app/models/article.rb File: http://gist.github.com/312871 class Article < ActiveRecord::Base validates :title, :presence => true validates :body, :presence => true end Save the file, and try creating an empty article again. Instead of saving the record, Rails displays a formatted error message, as shown in Figure 3-5.

note There is constant development and changing of conventions in the area of niche database libraries,

Listing 5-15. belongs_to, has_many, and has_and_belongs_to_many Declarations in app/models/event.rb

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