如何从数据库中选择特定的记录(没有“id”或“where”语句)

问题描述 投票:0回答:0

我需要在 python 函数中更改表中的最后一条记录,我需要它在循环中。

这是我的数据库表:

"starttime"          "endtime"               "price"   "foreign_key"
2023-02-23 00:00:00 | 2023-02-23 01:00:00   | 0.12812   | 1
2023-02-23 01:00:00 | 2023-02-23 02:00:00   | 0.1068    | 1
2023-02-23 02:00:00 | 2023-02-23 03:00:00   | 0.06      | 1
2023-02-23 03:00:00 | 2023-02-23 04:00:00   | 0.06005   | 1
2023-02-23 04:00:00 | 2023-02-23 05:00:00   | 0.10686   | 1
2023-02-23 05:00:00 | 2023-02-23 06:00:00   | 0.11522   | 1
2023-02-23 06:00:00 | 2023-02-23 07:00:00   | 0.13563   | 1
2023-02-23 07:00:00 | 2023-02-23 08:00:00   | 0.15773   | 1
2023-02-23 08:00:00 | 2023-02-23 09:00:00   | 0.17381   | 1
2023-02-23 09:00:00 | 2023-02-23 10:00:00   | 0.16396   | 1
2023-02-23 10:00:00 | 2023-02-23 11:00:00   | 0.1399    | 1
2023-02-23 11:00:00 | 2023-02-23 12:00:00   | 0.11974   | 1
2023-02-23 12:00:00 | 2023-02-23 13:00:00   | 0.11521   | 1
2023-02-23 13:00:00 | 2023-02-23 14:00:00   | 0.12723   | 1
2023-02-23 14:00:00 | 2023-02-23 15:00:00   | 0.1356    | 1
2023-02-23 15:00:00 | 2023-02-23 16:00:00   | 0.11524   | 1
2023-02-23 16:00:00 | 2023-02-23 17:00:00   | 0.11521   | 1
2023-02-23 17:00:00 | 2023-02-23 18:00:00   | 0.12061   | 1
2023-02-23 18:00:00 | 2023-02-23 19:00:00   | 0.12334   | 1
2023-02-23 19:00:00 | 2023-02-23 20:00:00   | 0.11179   | 1
2023-02-23 20:00:00 | 2023-02-23 21:00:00   | 0.1042    | 1
2023-02-23 21:00:00 | 2023-02-23 22:00:00   | 0.10362   | 1
2023-02-23 22:00:00 | 2023-02-23 23:00:00   | 0.09      | 1
2023-02-23 23:00:00 | 2023-02-23 00:00:00   | 0.07331   | 1

我曾尝试制作 where 语句、使用 id、制作 mysql 触发器,但它们无法循环工作。该应用程序必须 24/7 全天候运行,因此该功能必须处于循环状态。

python
© www.soinside.com 2019 - 2024. All rights reserved.