code: def copy(self, conn, ins_rows, table_bound):
          
          bound_cols = dict((c, sqlalchemy.bindparam("_" + c.key)) for c in table_bound.columns)
          ins = table_bound.insert().values(bound_cols)
          conn.execute(ins, ins_rows)
docs: This method does the actual insertion of the rows of data given by ins_rows into the
          database. A task that needs row updates instead of insertions should overload this method.
          :param conn: The sqlalchemy connection object
          :param ins_rows: The dictionary of rows with the keys in the format _<column_name>. For example
          if you have a table with a column name "property", then the key in the dictionary
          would be "_property". This format is consistent with the bindparam usage in sqlalchemy.
          :param table_bound: The object referring to the table
          :return: