# File lib/new_relic/agent/database.rb, line 201
        def adapter
          return unless @config

          @adapter ||= if @config[:adapter]
            symbolized_adapter(@config[:adapter].to_s.downcase)
          elsif @config[:uri] && @config[:uri].to_s =~ /^jdbc:([^:]+):/
            # This case is for Sequel with the jdbc-mysql, jdbc-postgres, or jdbc-sqlite3 gems.
            symbolized_adapter($1)
          else
            nil
          end
        end