如何从mysql中的数据行中删除换行符?

How to remove new line characters from data rows in mysql?(如何从mysql中的数据行中删除换行符?)

问题描述

我可以遍历 php 脚本中的所有行并执行

UPDATE mytable SET title = "'.trim($row['title']).'" where id = "'.$row['id'].'";

和trim可以去掉\n

但我只是想知道是否可以在一个查询中完成相同的事情?

 update mytable SET title = TRIM(title, '\n') where 1=1

能用吗?然后我就可以执行这个查询而不需要循环！

谢谢

(PS:我可以测试一下，但表很大，不想弄乱数据，所以想想你之前是否测试过这样的东西)

你的语法错误:

update mytable SET title = TRIM(TRAILING '\n' FROM title)

添加:

如果换行符在字段的开头:

update mytable SET title = TRIM(LEADING '\n' FROM title)

I can loop through all of the rows in a php script and do

UPDATE mytable SET title = "'.trim($row['title']).'" where id = "'.$row['id'].'";

and trim can remove \n

But I was just wondering if something same could be done in one query?

 update mytable SET title = TRIM(title, '\n') where 1=1

will it work? I can then just execute this query without requiring to loop through!

thanks

(PS: I could test it but table is quite large and dont want to mess with data, so just thought if you have tested something like this before)

your syntax is wrong:

update mytable SET title = TRIM(TRAILING '\n' FROM title)

Addition:

If the newline character is at the start of the field:

update mytable SET title = TRIM(LEADING '\n' FROM title)

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