# File lib/active_record/connection_adapters/jdbc_adapter.rb, line 472
      def adapter_spec(config)
        dialect = (config[:dialect] || config[:driver]).to_s
        ::JdbcSpec.constants.map { |name| ::JdbcSpec.const_get name }.each do |constant|
          if constant.respond_to? :adapter_matcher
            spec = constant.adapter_matcher(dialect, config)
            return spec if spec
          end
        end
        nil
      end