mysql - 行匹配 : 1 Changed: 0 Warnings: 0 Mysql update not happening

Question

我正在从 mysql 命令行更新表..更新没有发生..

表格说明如下:

mysql> describe userdailycalorie;
+-------------------+----------+------+-----+---------+-------+
| Field             | Type     | Null | Key | Default | Extra |
+-------------------+----------+------+-----+---------+-------+
| id                | int(11)  | NO   | PRI | NULL    |       |
| balanced_diet     | bit(1)   | YES  |     | NULL    |       |
| calories_consumed | double   | YES  |     | NULL    |       |
| date              | datetime | YES  |     | NULL    |       |
| user_id           | int(11)  | YES  | MUL | NULL    |       |
+-------------------+----------+------+-----+---------+-------+
5 rows in set (0.13 sec)

对应的表格内容如下:

mysql> select * from userdailycalorie;
+----+---------------+-------------------+---------------------+---------+
| id | balanced_diet | calories_consumed | date                | user_id |
+----+---------------+-------------------+---------------------+---------+
| 16 |               |                 0 | 2018-02-02 00:00:00 |       3 |
+----+---------------+-------------------+---------------------+---------+
1 row in set (0.00 sec)

对应的Update语句如下:

mysql> update userdailycalorie  set calories_consumed= 205.4  and balanced_diet =true WHERE user_id = 3;
Query OK, 0 rows affected (0.00 sec)
Rows matched: 1  Changed: 0  Warnings: 0

Rows matched is 1 这表明它选择了行..更新没有发生变化:0..我不确定为什么，...任何人都可以帮我调试这个问题吗？

Answer 1

如果你想更新两个字段不能使用AND，用逗号分隔每个要更新的字段,

update userdailycalorie  
set calories_consumed = 205.4  
  , balanced_diet = true 
WHERE user_id = 3;