MySQLで文字化けする時のメモ

他の接続は問題無いのに，なぜか

Illegal mix of collations (latin1_swedish_ci,IMPLICIT) and (utf8_general_ci,COERCIBLE) for operation '=':

などと言われるときは，character-set/collation を確認．

mysql> SHOW VARIABLES LIKE '%character%';
+--------------------------+----------------------------------------+
| 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/mysql/charsets/ | 
+--------------------------+----------------------------------------+
8 rows in set (0.00 sec)

mysql> SHOW VARIABLES LIKE '%collation%';
+----------------------+-----------------+
| Variable_name        | Value           |
+----------------------+-----------------+
| collation_connection | utf8_general_ci | 
| collation_database   | utf8_general_ci | 
| collation_server     | utf8_general_ci | 
+----------------------+-----------------+
3 rows in set (0.00 sec)

問題あるようなら下記を追加．

[mysqld]
default-character-set=utf8
character-set-server=utf8
collation-server=utf8_general_ci

[mysql]
default-character-set=utf8