module Rails::Generators::Database

def gem_for_database(database = options[:database])
  case database
  when "mysql"          then ["mysql2", ["~> 0.5"]]
  when "postgresql"     then ["pg", ["~> 1.1"]]
  when "sqlite3"        then ["sqlite3", ["~> 1.4"]]
  when "oracle"         then ["activerecord-oracle_enhanced-adapter", nil]
  when "sqlserver"      then ["activerecord-sqlserver-adapter", nil]
  when "jdbcmysql"      then ["activerecord-jdbcmysql-adapter", nil]
  when "jdbcsqlite3"    then ["activerecord-jdbcsqlite3-adapter", nil]
  when "jdbcpostgresql" then ["activerecord-jdbcpostgresql-adapter", nil]
  when "jdbc"           then ["activerecord-jdbc-adapter", nil]
  else [database, nil]
  end
end