MySQL 函数更新 URL 列值的域

Question

就说这张桌子吧

+--------------+---------------------------------+
| id           | path                            |
+--------------+---------------------------------+
| 1            | http://old.com/img/1.png        | 
| 2            | http://old.com/img/2.png        | 
| 3            | http://old.com/img/3.png        | 
| 4            | http://old.com/img/4.png        | 
| 5            | http://old.com/img/5.png        | 
| 6            | http://old.com/img/6.png        | 
+--------------+---------------------------------+

哪句话会更新为

+--------------+---------------------------------+
| id           | path                            |
+--------------+---------------------------------+
| 1            | http://new.com/img/1.png        | 
| 2            | http://new.com/img/2.png        | 
| 3            | http://new.com/img/3.png        | 
| 4            | http://new.com/img/4.png        | 
| 5            | http://new.com/img/5.png        | 
| 6            | http://new.com/img/6.png        | 
+--------------+---------------------------------+

我不知道如何替换 MySQL 中的字符串。

"UPDATE table SET path = REPLACE(path, 'old.com', 'new.com')"

??

我不能冒搞乱数据库的风险！

Answer 1

update mytable set path = replace(path, 'old.com', 'new.com');

如果您担心更新的影响（您应该担心），我首先这样做：

select path, replace(path, 'old.com', 'new.com') as new_path
from mytable;

我只是观察结果，看看它们是否“看起来不错”。如果他们这样做，请启动更新。

Answer 2

mySQL 本身没有正则表达式替换功能：正则表达式函数仅匹配。这是 mysql 文档