如何从mysql中的数据行中删除换行符？

Question

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)

Answer 1

UPDATE test SET log = REPLACE(REPLACE(log, '\r', ''), '\n', '');

worked for me.

while its similar, it'll also get rid of \\r\\n

http://lists.mysql.com/mysql/182689

Answer 2

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)

Answer 3

1) Replace all new line and tab characters with spaces.

2) Remove all leading and trailing spaces.

 UPDATE mytable SET `title` = TRIM(REPLACE(REPLACE(REPLACE(`title`, '\n', ' '), '\r', ' '), '\t', ' '));

Answer 4

update mytable set title=trim(replace(REPLACE(title,CHAR(13),''),CHAR(10),''));

以上工作正常。

Answer 5

Removes trailing returns when importing from Excel. When you execute this, you may receive an error that there is no WHERE; ignore and execute.

UPDATE table_name SET col_name = TRIM(TRAILING '\r' FROM col_name)

Answer 6

UPDATE mytable SET title=TRIM(REPLACE(REPLACE(title, "\n", ""), "\t", ""));

Answer 7

玩上面的答案，这个对我有用

REPLACE(REPLACE(column_name , '\n', ''), '\r', '')

Answer 8

My 2 cents.

To get rid of my \\n's I needed to do a \\\\n. Hope that helps someone.

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

Answer 9

For new line characters

UPDATE table_name SET field_name = TRIM(TRAILING '\n' FROM field_name);
UPDATE table_name SET field_name = TRIM(TRAILING '\r' FROM field_name);
UPDATE table_name SET field_name = TRIM(TRAILING '\r\n' FROM field_name);

For all white space characters

UPDATE table_name SET field_name = TRIM(field_name);
UPDATE table_name SET field_name = TRIM(TRAILING '\n' FROM field_name);
UPDATE table_name SET field_name = TRIM(TRAILING '\r' FROM field_name);
UPDATE table_name SET field_name = TRIM(TRAILING '\r\n' FROM field_name);
UPDATE table_name SET field_name = TRIM(TRAILING '\t' FROM field_name);

Read more: MySQL TRIM Function