1

如果我运行以下查询：

ALTER TABLE `price_s` ADD COLUMN `ts` TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP  AFTER `price_s_id` ;

新列将填充0000-00-00 00:00:00. 在我修改该列之前，该列中的值不会更新为当前时间戳，即ON UPDATE CURRENT_TIMESTAMP似乎工作正常。

如果我运行：

SELECT version( ) , @@time_zone , @@system_time_zone , NOW( ) , UTC_TIMESTAMP( )

我有：

'5.5.15', '+10:00', 'EST', '2012-08-23 14:56:59', '2012-08-23 04:56:59'

我想将 UTC 时间存储在列ts中，我该怎么做？

不确定这是否相关，我试图生成mysql.time_zone*表格：

Miranda-Macbook: ./mysql_tzinfo_to_sql /usr/share/zoneinfo | ./mysql -p -u root mysql
Enter password: Warning: Unable to load '/usr/share/zoneinfo/+VERSION' as time zone. Skipping it.

Warning: Unable to load '/usr/share/zoneinfo/Asia/Riyadh87' as time zone. Skipping it.
Warning: Unable to load '/usr/share/zoneinfo/Asia/Riyadh88' as time zone. Skipping it.
Warning: Unable to load '/usr/share/zoneinfo/Asia/Riyadh89' as time zone. Skipping it.
Warning: Unable to load '/usr/share/zoneinfo/Mideast/Riyadh87' as time zone. Skipping it.
Warning: Unable to load '/usr/share/zoneinfo/Mideast/Riyadh88' as time zone. Skipping it.
Warning: Unable to load '/usr/share/zoneinfo/Mideast/Riyadh89' as time zone. Skipping it.
Warning: Unable to load '/usr/share/zoneinfo/iso3166.tab' as time zone. Skipping it.
Warning: Unable to load '/usr/share/zoneinfo/zone.tab' as time zone. Skipping it.

感谢@Sameer 和@Marc B。现在我更了解时间戳了。（在本文的帮助下）它已经存储在UTC 中，所以我实际上需要的是：

SET time_zone = 'SYSTEM';
UPDATE tablename SET ts=now()
4

1 回答 1

2 
INSERT INTO yourtable (ts) VALUES (now())
UPDATE yourtable SET ts=now()

As long as whatever you're stuffing into the ts field is a valid mysql timestamp string (yyyy-mm-dd hh:mm:ss) it doesn't matter WHAT the timezone is. That only becomes relevant upon conversion or retrieval - mysql datefields themselves have no concept of timezones, they're just repositories of some date/time data.

于 2012-08-23T05:08:43.423 回答