Change MySQL default character set to UTF-8 in my.cnf?

注：  mysql 5.5.40-0ubuntu0.14.04.1 (Ubuntu) 可以按此修改编码。

For the recent version of MySQL,

default-character-set = utf8

causes a problem. It's deprecated I think.

As Justin Ball  says in "Upgrade to MySQL 5.5.12 and now MySQL won’t start , you should:

1. Remove that directive and you should be good.

2. Then your configuration file ('/etc/my.cnf' for example) should look like that:

   [mysqld]collation-server = utf8_unicode_ciinit-connect='SET NAMES utf8'character-set-server = utf8

3. Restart MySQL.

4. For making sure, your MySQL is UTF-8, run the following queries in your MySQL prompt:

   • First query:

      mysql> show variables like 'char%';

     The output should look like:

      +--------------------------+---------------------------------+ | Variable_name            | Value                           | +--------------------------+---------------------------------+ | character_set_client     | utf8                            | | character_set_connection | utf8                            | | character_set_database   | utf8                            | | character_set_filesystem | binary                          | | character_set_results    | utf8                            | | character_set_server     | utf8                            | | character_set_system     | utf8                            | | character_sets_dir       | /usr/local/mysql/share/charsets/| +--------------------------+---------------------------------+

   • Second query:

      mysql> show variables like 'collation%';

     And the query output is:

      +----------------------+-----------------+ | Variable_name        | Value           | +----------------------+-----------------+ | collation_connection | utf8_general_ci | | collation_database   | utf8_unicode_ci | | collation_server     | utf8_unicode_ci | +----------------------+-----------------+