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在 python 3.x 中，我有一个具有此定义的类

     def sproc(self, sql, *args):
          self.__open()
          self.__session.callproc(sql, args)
          number_rows = self.__session.rowcount
          number_columns = len(self.__session.description)

          if number_rows >= 1 and number_columns > 1:
               result = [item for item in self.__session.fetchall()]
          else:
               result = [item[0] for item in self.__session.fetchall()]
          self.__close
          return result

在我的 workhorse.py 脚本中，我定义了 call sproc。

def tradepl(user_id, play_entry_id, play_exit_id):
    try:
        db_cnx = db(dbconfig.database_configuration['host']
        , dbconfig.database_configuration['user']
        , dbconfig.database_configuration['password']
        , dbconfig.database_configuration['database'])

        args = (user_id, play_entry_id, play_exit_id)
        result = db_cnx.sproc('lastpl', args)
        return result

    except Exception as err:
        print(err)

lastpl 是一个存储过程，具有以下内容：

DELIMITER //

CREATE PROCEDURE lastPl (user_id int, play_entry_id int, play_exit_id int, OUT profit_dollar decimal(10,2), OUT profit_percent decimal(10,2), OUT days_in_trade int)
BEGIN

/**** get profit and loss data from the closing trade ****/

    select
    case p1.entry_transaction_type when 'sto' then (p1.entry_cost - p2.exit_cost)
                else (p2.exit_cost - p1.entry_cost)
                END profit_dollar
    , case p1.entry_transaction_type when 'sto' then (((p1.entry_cost - p2.exit_cost)/p1.entry_cost) * 100)
                else (((p2.exit_cost - p1.entry_cost)/p1.entry_cost) * 100)
                END profit_percent
    , datediff(p1.entry_date, p2.exit_date) days_in_trade
    from play_entry p1
    join play_exit p2
        on p1.play_entry_id = p2.play_entry_id
    where p1.user_id = user_id
    and p1.play_entry_id = play_entry_id
    and p2.play_exit_id = play_exit_id;

END //

DELIMITER ;

当我调用 tradepl 定义时，我得到了错误：

output = tradepl(user_id[0], play_entry_id[0], play_exit_id)
for row in output:
    profit_dollar = row[0]
    profit_percent = row[1]
    day_in_trade = row[2]

(1241, 'Operand should contain 1 column(s)') 'NoneType' object is not iterable

我在整个过程中花了大约 5 个小时，几乎筋疲力尽。google/duckduck 上出现的搜索结果与我想要完成的不匹配。

任何帮助将不胜感激。谢谢

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