ON DUPLICATE KEY UPDATE的MySQL默认值错误

Question

为什么我收到此错误？MySQL版本有什么变化会导致这个(在某一点上工作)现在失败了吗？在INSERT INTO不指定user_ID的值会如果插入做是必需的,但由于ID 1已经存在,这应该成为一个UPDATE和有效.

mysql> select * from article;
+----+---------+---------------------+-----------+-----------+
| id | user_id | published_at        | title     | content   |
+----+---------+---------------------+-----------+-----------+
|  1 |       1 | 2011-12-10 12:10:00 | article 1 | content 1 |
|  2 |       2 | 2011-12-20 16:20:00 | article 2 | content 2 |
|  3 |       1 | 2012-01-04 22:00:00 | article 3 | content 3 |
+----+---------+---------------------+-----------+-----------+
3 rows in set (0.00 sec)

mysql> desc article;
+--------------+------------------+------+-----+-------------------+----------------+
| Field        | Type             | Null | Key | Default           | Extra          |
+--------------+------------------+------+-----+-------------------+----------------+
| id           | int(11) unsigned | NO   | PRI | NULL              | auto_increment |
| user_id      | int(11) unsigned | NO   | MUL | NULL              |                |
| published_at | datetime         | NO   |     | CURRENT_TIMESTAMP |                |
| title        | varchar(100)     | NO   |     | NULL              |                |
| content      | text             | NO   |     | NULL              |                |
+--------------+------------------+------+-----+-------------------+----------------+
5 rows in set (0.01 sec)

mysql> INSERT INTO article (id)
    -> VALUES (1)
    -> ON DUPLICATE KEY UPDATE title = 'article 1b', content = 'content 1b';
ERROR 1364 (HY000): Field 'user_id' doesn't have a default value

MySQL版本5.6.12.

Answer 1

你得到的错误是因为

1. 该user_id列定义为NOT NULL
2. 该user_id列没有指定默认值
3. 您也不在查询中指定其值

PS:问题与该ON DUPLICATE KEY UPDATE条款无关- 如果您不使用它也会出现同样的错误.

PPS:无论是否ON DUPLICATE KEY UPDATE触发 - 您insert应该满足所有约束