    # File lib/active_record/connection_adapters/abstract/connection_specification.rb, line 276
        def self.remove_connection(klass=self)
          spec = @@defined_connections[klass.name]
          konn = active_connections[klass.name]
          @@defined_connections.delete_if { |key, value| value == spec }
          active_connections.delete_if { |key, value| value == konn }
          konn.disconnect! if konn
          spec.config if spec
        end