Migrating MySQL UTF8 to UTF8MB4 problems and questions

Question

Im trying to convert my UTF8 MySQL 5.5.30 database to UTF8MB4. I have looked at this article https://mathiasbynens.be/notes/mysql-utf8mb4 but have some questions.

I

Answer 1

DB="database_name"
USER="mysql_user"
PASS="mysql_password"
(
    echo 'ALTER DATABASE `'"$DB"'` CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci;'
    mysql -p$PASS -u $USER "$DB" -e "SHOW TABLES" --batch --skip-column-names \
    | xargs -I{} echo 'ALTER TABLE `'{}'` CONVERT TO CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci;'
) \
| mysql -p$PASS -u $USER "$DB"

• To get the script you work open your command line and use the following steps:

  1. nano convert_to_utf8mb4.sh
  2. paste the script & save
  3. sudo chmod 755 convert_to_utf8mb4.sh (in terminal)
  4. run the script by type ./convert_to_utf8mb4.sh

  Yes, collation has been changed!