Sequel version 0.3.1 has just been released. This release includes an
experimental Oracle adapter, better Database#fetch functionality, and
other minor bug fixes and improvements.

Following is a discussion of the changes:

=== Preliminary Oracle adapter

Sequel now includes an Oracle adapter, based on the 'oci8' library. To
connect to an Oracle adapter you can supply a URL:

  require 'sequel/oracle'
  DB = Sequel('oracle://user:password@my_db')
  # or
  DB = Sequel('oracle://user:password@server1/my_db')

Or use the Sequel.oracle method:

  require 'sequel/oracle'
  DB = Sequel.oracle('my_db', :user => 'user', :password => '******')

Please note that this adapter was not tested (since I do not have
access to an Oracle database) and may require some patching before it
is actually usable. So if anyone is willing to do the testing that
would help tremendously.

=== A better Database#fetch

Sequel 0.3 introduced a new way to fetch records using arbitrary SQL,
using Database#fetch (and the shortcut using DB#[]). Instead of
returning an enumerator, this method now returns a dataset modified to
always execute the same SQL statement, letting you treat it just like
a normal Dataset instance:

  DB['SELECT * FROM items'].print
  DB['SELECT * FROM items'].all
  DB['SELECT * FROM items'].map(:id)
  DB['SELECT * FROM items'].to_hash(:id, :name)

=== Other improvements and bug fixes

* More documentation for Sequel models.

* Deprecated Model#pkey. Implemented better Model#pk method.

* foreign_key definitions now accept :key option for specifying the
remote key (#73).

* Sequel now requires ParseTree version 2.0.0 or later (#74).

* Fixed string literalization in mysql adapter for strings with
comment backslashes in them (#75).

* Changed postgres adapter to use the ruby-postgres library's type
conversion if available (#76).

* Fixed Model#method_missing to not raise error for columns not in the
table but for which a value exists (#77).

* Fixed YAML serialization (#78).

* Fixed miscellaneous typos.

=== More info

Sequel project page:
  <http://code.google.com/p/ruby-sequel>

Sequel documentation:
  <http://sequel.rubyforge.org>

Join the Sequel-talk group:
  <http://groups.google.com/group/sequel-talk>

Install the gem:
  sudo gem install sequel

Or check out the source and install manually:
  svn co http://ruby-sequel.googlecode.com/svn/trunk sequel
  cd sequel
  rake install