def delete_keys_with_prefix (prefix)

      # only ADB has the #misc method...

      if @db.respond_to?(:misc)
        @db.misc('outlist', @db.fwmkeys(prefix, -1))
      else
        @db.fwmkeys(prefix, -1).each { |k| self.delete(k) }
      end

      nil
    end
def delete_keys_with_prefix (prefix)

      # only ADB has the #misc method...

      if @db.respond_to?(:misc)
        @db.misc('outlist', @db.fwmkeys(prefix, -1))
      else
        @db.fwmkeys(prefix, -1).each { |k| self.delete(k) }
      end

      nil
    end
Deletes all the entries whose keys begin with the given prefix