== SqlSessionStore

See http://railsexpress.de/blog/articles/2005/12/19/roll-your-own-sql-session-store

Only Mysql, Postgres and Oracle are currently supported (others work,
but you won't see much performance improvement).

== Step 1

If you have generated your sessions table using rake db:sessions:create, go to Step 2

If you're using an old version of sql_session_store, run
    script/generate sql_session_store DB
where DB is mysql, postgresql or oracle

Then run
    rake migrate
or
    rake db:migrate
for edge rails.

== Step 2

Add the code below after the initializer config section:

    ActionController::CgiRequest::DEFAULT_SESSION_OPTIONS.
      update(:database_manager => SqlSessionStore)

Finally, depending on your database type, add

    SqlSessionStore.session_class = MysqlSession
or

    SqlSessionStore.session_class = PostgresqlSession
or
    SqlSessionStore.session_class = OracleSession

after the initializer section in environment.rb

== Step 3 (optional)

If you want to use a database separate from your default one to store
your sessions, specify a configuration in your database.yml file (say
sessions), and establish the connection on SqlSession in
environment.rb:

   SqlSession.establish_connection :sessions


== IMPORTANT NOTES

1. The class name SQLSessionStore has changed to SqlSessionStore to
   let Rails work its autoload magic.

2. You will need the binary drivers for Mysql or Postgresql.
   These have been verified to work:

   * ruby-postgres (0.7.1.2005.12.21) with postgreql 8.1
   * ruby-mysql 2.7.1 with Mysql 4.1
   * ruby-mysql 2.7.2 with Mysql 5.0