mysqlchar类型主键做查询、更新条件时遇见怪事了，求大神解答
来源：懂视网
责编：小采
时间：2020-11-09 16:43:20
mysqlchar类型主键做查询、更新条件时遇见怪事了，求大神解答
mysqlchar类型主键做查询、更新条件时遇见怪事了，求大神解答:mysql mysql> desc card_info;+-------------+-----------+------+-----+-------------------+-------+| Field | Type | Null | Key | Default | Extra |+-------------+-----------+------+-----+-------------------+-------+| card_number | char(20) |
导读mysqlchar类型主键做查询、更新条件时遇见怪事了，求大神解答:mysql mysql> desc card_info;+-------------+-----------+------+-----+-------------------+-------+| Field | Type | Null | Key | Default | Extra |+-------------+-----------+------+-----+-------------------+-------+| card_number | char(20) |
mysql
mysql> desc card_info;
+-------------+-----------+------+-----+-------------------+-------+
| Field | Type | Null | Key | Default | Extra |
+-------------+-----------+------+-----+-------------------+-------+
| card_number | char(20) | NO | PRI | | |
| hit_time | int(11) | NO | | 0 | |
| modify_time | timestamp | NO | | CURRENT_TIMESTAMP | |
+-------------+-----------+------+-----+-------------------+-------+
card_number做insert条件时，值需要加单引号；
做update条件时，一个长度为15的值不加单引号才能实现，一个长度为19的值无论加不加单引号都无法实现更新
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mysqlchar类型主键做查询、更新条件时遇见怪事了，求大神解答
mysqlchar类型主键做查询、更新条件时遇见怪事了，求大神解答:mysql mysql> desc card_info;+-------------+-----------+------+-----+-------------------+-------+| Field | Type | Null | Key | Default | Extra |+-------------+-----------+------+-----+-------------------+-------+| card_number | char(20) |
