You don't need a cursor. If your specific character can't be displayed, it can be represented by char(x).
Sometimes you don't need to borrow books from the library. If you modify something in the database, you need to use the following statement.
The sql statement is: update `table _ name`set`field _ name` = replace (`field _ name`, `from _ str', to _ str').
Code description: table _ name- table name, field _ name- field name, from _ str- string to be replaced, to _ str- string to be replaced.