code: def write_info(self, w):
          
          w.write_b_varchar("")  # db_name, should be empty
          w.write_b_varchar(self._table_type.typ_schema)
          w.write_b_varchar(self._table_type.typ_name)
docs: Writes TVP_TYPENAME structure
  
          spec: https://msdn.microsoft.com/en-us/library/dd302994.aspx
          @param w: TdsWriter
          @return: