How to remove hex characters from DB?

i have a MySQL DB where the rows have c开发者_如何学JAVAharacters like %20, %2C, etc... how can i remove them from the DB without editing the file on notepad? The .sql file is about 300mb in size... thanks

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What database?

Do you want to replace codes with their proper characters; like %20 with ' ' (space)?

You may need to look at exactly how your text is escaped, but you can naively do something using builtin string functions:

http://dev.mysql.com/doc/refman/5.1/en/string-functions.html#function_replace

http://dev.mysql.com/doc/refman/5.1/en/string-functions.html#function_unhex

UPDATE tbl
SET col = REPLACE(col, '%20', UNHEX('20'))
WHERE col LIKE '%\%20%';

Also, I would take measures to ensure that this kind of data does not get into the database in whatever insert/import mechanism was used.