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我有一个通过导入长CSV电子表格而定期更新的情节表。通常，大多数记录保持不变，但是它们都包含在CSV中。为了检测哪些行实际更新，我在更新CURRENT_TIMESTAMP列“mtime”时添加了TIMESTAMP默认的CURRENT_TIMESTAMP。即使没有值更改，mysql current_timestamp列也会更新
不幸的是，每次对每个导入的行重新设置每一行的时间戳值，即使它的值没有实际改变。
实际表中的列数多于CSV文件中包含的列数，因此在UPDATE查询中有多个列。以下是表格布局和通过导入CSV文件触发的示例UPDATE查询。任何人都可以确定什么可能触发TIMESTAMP列重置，即使没有任何值是不同的？非常感谢！
+---------------+-----------------------+------+-----+---------------------+-----------------------------+
| Field | Type | Null | Key | Default | Extra |
+---------------+-----------------------+------+-----+---------------------+-----------------------------+
| id | mediumint(7) unsigned | NO | PRI | NULL | auto_increment |
| ctime | timestamp | NO | | 0000-00-00 00:00:00 | |
| mtime | timestamp | NO | | CURRENT_TIMESTAMP | on update CURRENT_TIMESTAMP |
| network_id | mediumint(7) unsigned | NO | MUL | 0 | |
| series_id | mediumint(6) unsigned | NO | MUL | NULL | |
| season_id | mediumint(7) unsigned | NO | MUL | NULL | |
| num | mediumint(7) unsigned | NO | | NULL | |
| title | varchar(150) | NO | | NULL | |
| isactive | tinyint(1) | NO | MUL | 1 | |
| istve | tinyint(1) | NO | | 0 | |
| isest | tinyint(1) | NO | | 0 | |
| ismob | tinyint(1) | NO | | 0 | |
| isvod | tinyint(1) | NO | | 0 | |
| tve_start | date | NO | | 0000-00-00 | |
| est_start | date | NO | | 0000-00-00 | |
| mob_start | date | NO | | 0000-00-00 | |
| vod_start | date | NO | | 0000-00-00 | |
| tve_end | date | NO | | 0000-00-00 | |
| est_end | date | NO | | 0000-00-00 | |
| mob_end | date | NO | | 0000-00-00 | |
| vod_end | date | NO | | 0000-00-00 | |
| fposter | varchar(150) | NO | | | |
| iswebisode | tinyint(1) | NO | | 0 | |
| date_air | date | NO | | 0000-00-00 | |
| roll_start | date | NO | | 0000-00-00 | |
| roll_end | date | NO | | 0000-00-00 | |
| season_start | date | NO | | 0000-00-00 | |
| season_end | date | NO | | 0000-00-00 | |
| premier_start | date | NO | | 0000-00-00 | |
| premier_end | date | NO | | 0000-00-00 | |
| iscore | tinyint(1) | NO | | 1 | |
| note | varchar(150) | NO | | | |
| tvn_filename | varchar(150) | NO | | | |
| tve_filename | varchar(150) | NO | | | |
| repeat_start | date | NO | | 0000-00-00 | |
| repeat_end | date | NO | | 0000-00-00 | |
| hasedited | tinyint(1) | NO | | 1 | |
| import_key | char(32) | NO | | | |
+---------------+-----------------------+------+-----+---------------------+-----------------------------+
UPDATE `episode` SET `network_id`='25', `series_id`='321', `season_id`='6887', `num`='10', `title`='EPISODE 810', `isvod`='1', `vod_start`='2011-09-05', `vod_end`='2011-10-31', `ismob`='1', `mob_start`='2011-09-05', `isest`='1', `est_start`='2011-09-05', `note`='', `date_air`='2011-09-04', `roll_start`='0000-00-00', `roll_end`='0000-00-00', `premier_start`='2011-09-04', `premier_end`='2011-10-09', `tvn_filename`='', `tve_filename`='' WHERE `id`='2821'
CREATE TABLE IF NOT EXISTS `episode` (
`id` mediumint(7) unsigned NOT NULL AUTO_INCREMENT,
`ctime` timestamp NOT NULL DEFAULT '0000-00-00 00:00:00',
`mtime` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
`network_id` mediumint(7) unsigned NOT NULL DEFAULT '0',
`series_id` mediumint(6) unsigned NOT NULL,
`season_id` mediumint(7) unsigned NOT NULL,
`num` mediumint(7) unsigned NOT NULL,
`title` varchar(150) COLLATE latin1_general_ci NOT NULL,
`isactive` tinyint(1) NOT NULL DEFAULT '1',
`istve` tinyint(1) NOT NULL DEFAULT '0',
`isest` tinyint(1) NOT NULL DEFAULT '0',
`ismob` tinyint(1) NOT NULL DEFAULT '0',
`isvod` tinyint(1) NOT NULL DEFAULT '0',
`tve_start` date NOT NULL DEFAULT '0000-00-00',
`est_start` date NOT NULL DEFAULT '0000-00-00',
`mob_start` date NOT NULL DEFAULT '0000-00-00',
`vod_start` date NOT NULL DEFAULT '0000-00-00',
`tve_end` date NOT NULL DEFAULT '0000-00-00',
`est_end` date NOT NULL DEFAULT '0000-00-00',
`mob_end` date NOT NULL DEFAULT '0000-00-00',
`vod_end` date NOT NULL DEFAULT '0000-00-00',
`fposter` varchar(150) COLLATE latin1_general_ci NOT NULL DEFAULT '',
`iswebisode` tinyint(1) NOT NULL DEFAULT '0',
`date_air` date NOT NULL DEFAULT '0000-00-00',
`roll_start` date NOT NULL DEFAULT '0000-00-00',
`roll_end` date NOT NULL DEFAULT '0000-00-00',
`season_start` date NOT NULL DEFAULT '0000-00-00',
`season_end` date NOT NULL DEFAULT '0000-00-00',
`premier_start` date NOT NULL DEFAULT '0000-00-00',
`premier_end` date NOT NULL DEFAULT '0000-00-00',
`iscore` tinyint(1) NOT NULL DEFAULT '1',
`note` varchar(150) COLLATE latin1_general_ci NOT NULL DEFAULT '',
`tvn_filename` varchar(150) COLLATE latin1_general_ci NOT NULL DEFAULT '',
`tve_filename` varchar(150) COLLATE latin1_general_ci NOT NULL DEFAULT '',
`repeat_start` date NOT NULL DEFAULT '0000-00-00',
`repeat_end` date NOT NULL DEFAULT '0000-00-00',
`hasedited` tinyint(1) NOT NULL DEFAULT '1',
`import_key` char(32) COLLATE latin1_general_ci NOT NULL DEFAULT '',
PRIMARY KEY (`id`),
KEY `season_id` (`season_id`),
KEY `idx_series` (`isactive`,`season_id`),
KEY `idx_master_cron` (`isactive`,`hasedited`),
KEY `network_id` (`network_id`),
KEY `series_id` (`series_id`),
KEY `season_id_2` (`season_id`)
) ENGINE=MyISAM DEFAULT CHARSET=latin1 COLLATE=latin1_general_ci ;
请提供表格创建查询 – 2013-02-26 19:52:08
可能行正在更新，您没有注意到它，因为少数行NewValue是相同的OldValue – 2013-02-26 19:52:48
@ Fathah Rehman P - 我为您添加了CREATE TABLE查询！谢谢。 – snucky 2013-02-26 20:01:40