无法执行查询：BIGINT UNSIGNED值超出范围

Question

每10分钟开始计算一次cron作业后出现以下错误：

Output from command /usr/bin/php -q /var/www/html/mydomain/_cron/cron.php ..

PHP Notice:  Can't execute query: BIGINT UNSIGNED value is out of range in '(`karsi_jiggo`.`user`.`hide_time` - 10)'
UPDATE user SET hide_time=(hide_time-10), last_visit=last_visit WHERE hide_time>0 in /var/www/html/MyDomain/_include/lib/db.php on line 100

Notice: Can't execute query: BIGINT UNSIGNED value is out of range in '(`karsi_jiggo`.`user`.`hide_time` - 10)'
UPDATE user SET hide_time=(hide_time-10), last_visit=last_visit WHERE hide_time>0 in /var/www/html/MyDomain/_include/lib/db.php on line 100

Answer 1

根据您的输出，您的数据库中看起来有一些数据，其中hide_time> 0但是<10，这样当您尝试从hide_time中减去10时，它会变为负数且超出范围unsigned int。

要排除故障

SELECT * from user
WHERE hide_time > 0
AND hide_time < 10

Answer 2

您的查询;

UPDATE user SET hide_time=(hide_time-10), last_visit=last_visit WHERE hide_time>0

...如果在查询开头是-5，则会很高兴尝试将hide_time设置为5（hide_time＆gt; 0选择旧值，而不是更新值）

BIGINT UNSIGNED无法保留负值，因此错误。