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(in /home/george/projects/emporium) == CreatePublishers: migrating ================================================ -- create_table(:publishers) -> 0.2030s == CreatePublishers: migrated (0.2030s) ======================================= The new table has two columns: id and name. Note that the id column is automatically added by ActiveRecord migrations, so we need to add only the name column to the migration script. We limit the name column s length to a maximum length of 255 characters. We also specify that we don t accept null values in the name field and that the name must be unique. Following good practices, we undo all changes in the down method by telling ActiveRecord to delete the publishers table.

If the account has sufficient balances, then we debit one account and credit the other account and commit the transaction.

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.

if (bal.getOrElse(from, 0) > amount) { who ! (xid, Update(from, v => (v getOrElse 0) - amount)) who ! (xid, Update(to, v => (v getOrElse 0) + amount)) who ! (xid, CommitXAction) } else {

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With the database table in place, you can use the scaffolding script to create an almost complete CRUD implementation for the publisher administration, unlike in 2 where all code was created by hand. Execute the scaffolding script as follows: $ script/generate scaffold Publisher 'admin/publisher' exists exists create exists dependency exists exists exists create create create create create create create create create create create create identical app/controllers/admin app/helpers/admin app/views/admin/publisher test/functional/admin model app/models/ test/unit/ test/fixtures/ app/models/publisher.rb test/unit/publisher_test.rb test/fixtures/publishers.yml app/views/admin/publisher/_form.rhtml app/views/admin/publisher/list.rhtml app/views/admin/publisher/show.rhtml app/views/admin/publisher/new.rhtml app/views/admin/publisher/edit.rhtml app/controllers/admin/publisher_controller.rb test/functional/admin/publisher_controller_test.rb app/helpers/admin/publisher_helper.rb app/views/layouts/publisher.rhtml public/stylesheets/scaffold.css

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 a 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 MS 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 MS SQL Server from Ruby:

If we don t get the balance within 500 milliseconds or there s not sufficient funds, roll back the transaction.

http://wiki.rubyonrails.org/rails/pages/ HowtoConnectToMicrosoftSQLServer http://wiki.rubyonrails.org/rails/pages/ HowtoConnectToMicrosoftSQLServerFromRailsOnOSX http://wiki.rubyonrails.org/rails/pages/ HowtoConnectToMicrosoftSQLServerFromRailsOnLinux

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

who ! (xid, RollbackXAction) } case _ => who ! (xid, RollbackXAction) } }

The scaffolding script creates the model, controller, and views required for doing CRUD operations on the publishers table. Furthermore, the scaffolding creates an empty unit test for the model, along with a fixture file and a functional test. Next, we demonstrate the wonders of scaffolding to George. He says: Damned consultants! I m gonna go blind if I have to look at that page for more than ten seconds! Is this all you can do We understand his point, and show him the new site design we have quietly been working on, to which he responds, It s not going to win any design awards. But, it will do until I can find the money to hire a professional web designer.