gem_for_database

# File railties/lib/rails/generators/database.rb, line 14
      def gem_for_database(database = options[:database])
        case database
        when "mysql"          then ["mysql2", ["~> 0.5"]]
        when "trilogy"        then ["trilogy", ["~> 2.4"]]
        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