clear_all_cached_connections!

# File activerecord/lib/active_record/connection_adapters/abstract/connection_specification.rb, line 134
        def clear_all_cached_connections!
          if @@allow_concurrency
            @@active_connections.each_value do |connection_hash_for_thread|
              connection_hash_for_thread.each_value {|conn| conn.disconnect! }
              connection_hash_for_thread.clear
            end
          else
            @@active_connections.each_value {|conn| conn.disconnect! }
          end
          @@active_connections.clear          
        end