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a closer look at the code that is generated with scaffolding, even if you don t plan on using scaffolding.

Once the mysql gem is installed, connecting to and using a MySQL server from Ruby is almost as simple as using a SQLite database:

Initial balances: dpp: Info(Map(Savings -> 1000, Checking -> 100)) archer: Info(Map(Savings -> 2000, Checking -> 50))

require 'rubygems' require 'mysql' # Connect to a MySQL database 'test' on the local machine # using username of 'root' with no password. db = Mysql.connect('localhost', 'root', '', 'test') # Perform an arbitrary SQL query db.query("INSERT INTO people (name, age) VALUES('Chris', 25)") # Perform a query that returns data begin query = db.query('SELECT * FROM people') puts "There were #{query.num_rows} rows returned" query.each_hash do |h| puts h.inspect end rescue puts db.errno puts db.error end # Close the connection cleanly db.close

Let s define a variable that keeps track of our transaction IDs:

This code demonstrates a basic, arbitrary SQL query, as well as a query that results in data being returned (in a row-by-row hash format). It also features basic error reporting by catching exceptions with a rescue block and using the error-retrieval methods provided by the MySQL library.

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We will start by implementing the administrator interface for maintaining the list of publishers. We need a table for storing publishers, so the first thing we need to do is to update the database schema by adding the publishers table to the database schema.

Note You can also access MySQL databases using the database-agnostic DBI library, covered later in this

Next, let s define a method that will transactionally transfer money between accounts for a single Actor as long as there are sufficient funds:

Like MySQL, PostgreSQL (pronounced post-gres-Q-L) is a free relational database server that s available under an open source license, allowing you to download and use it for free. Although PostgreSQL offers many of the same features as MySQL, it s quite different. PostgreSQL users claim it s faster and more stable and offers more features. It is also often claimed that PostgreSQL follows SQL standards more correctly, whereas MySQL is more pragmatic (in the sense that it s more willing to break away from established standards) and extends the SQL language for its own benefits. As with MySQL, PostgreSQL access is achieved in Ruby with a library, also available as a RubyGem. To install, use this code:

On some setups it might be necessary to specify where PostgreSQL is installed, like so:

who ! BeginXAction(xid)

As in the previous chapter, we will use ActiveRecord migrations to make the necessary modifications to the database schema. We could also use plain SQL, but migrations have the added benefit of being database-agnostic and allowing you to roll back changes. First, create the create_publishers migration file, which you will use for adding the publishers table to the database schema: $ script/generate migration create_publishers exists db/migrate create db/migrate/002_create_publishers.rb Open db/migrate/002_create_publishers.rb in your editor and change it as follows: class CreatePublishers < ActiveRecord::Migration def self.up create_table :publishers do |table| table.column :name, :string, :limit => 255, :null => false, :unique => true end end def self.down drop_table :publishers end end The migration will create a table named publishers when run, as the following sample output shows: $ rake db:migrate

The interface for the Postgres library is totally different from that for MySQL or SQLite, and it s documented in full at http://ruby.scripting.ca/postgres/rdoc/. (You can also access PostgreSQL databases using the database-agnostic DBI library, covered in the later section DBI: A Generic Database Connectivity Library. )

We begin the transaction and get the current balances:

Oracle Corp. is a company that provides database tools, services, and software, and is primarily known for the development of the Oracle RDBMS, a relational database management system. The Oracle database system is not open source and is not, in its full version, available for free to use commercially. However, it s reasonably popular in enterprise situations, so you might need to know how to connect to it.

Note Oracle does offer versions of its database systems for free, but they are only to be used for