[mysql]修改collation为utf8_bin

mysql默认字段值区分大小写：
character-set-server=utf8
collation-server=utf8_bin
init-connect="SET NAMES utf8;"

SELECT DEFAULT_CHARACTER_SET_NAME "charset", DEFAULT_COLLATION_NAME "collation" 
FROM information_schema.SCHEMATA WHERE SCHEMA_NAME = "billing01";

SELECT DEFAULT_CHARACTER_SET_NAME "charset", DEFAULT_COLLATION_NAME "collation" ,SCHEMA_NAME
FROM information_schema.SCHEMATA;


mysql> SHOW CHARACTER SET LIKE "utf8";
+---------+---------------+-------------------+--------+
| Charset | Description   | Default collation | Maxlen |
+---------+---------------+-------------------+--------+
| utf8    | UTF-8 Unicode | utf8_general_ci   |      3 |
+---------+---------------+-------------------+--------+
1 row in set (0.00 sec)
https://blog.csdn.net/ghosind/article/details/83692869


mysql启动报错：
2019-10-29T08:52:41.945012+08:00 0 [ERROR] [MY-010936] [Server] COLLATION "utf8_bin" is not valid for CHARACTER SET "utf8mb4"
2019-10-29T08:52:41.946520+08:00 0 [ERROR] [MY-010119] [Server] Aborting
必须加character-set-server=utf8

my.cnf加
init_connect="SET collation_connection = utf8_bin"
也不行。


SHOW CHARACTER SET LIKE "utf8";
mysqld —-character-set-server=utf8mb4 —-collation-server=utf8mb4_bin
ALTER DATABASE database-name CHARACTER SET charset-name COLLATE collation-name;
ALTER DATABASE billing01 CHARACTER SET utf8 COLLATE utf8_bin;
ALTER DATABASE billing02 CHARACTER SET utf8 COLLATE utf8_bin;
ALTER DATABASE billing03 CHARACTER SET utf8 COLLATE utf8_bin;
ALTER DATABASE billing04 CHARACTER SET utf8 COLLATE utf8_bin;
https://www.cnblogs.com/benpao/p/11519029.html