How to support full Unicode in MySQL databases

https://mathiasbynens.be/notes/mysql-utf8mb4#character-sets
https://stackoverflow.com/questions/3513773/change-mysql-default-character-set-to-utf-8-in-my-cnf

Trên Ub 16 file config MySQL tách ra 2 Dir:
!includedir /etc/mysql/conf.d/
!includedir /etc/mysql/mysql.conf.d/

=> Config/backup 2 file trong 2 mục trên.

Client/mysql:

[client]

default-character-set = utf8mb4

[mysql]

default-character-set = utf8mb4

Server/mysqld:

[mysqld]

character-set-client-handshake = FALSE

character-set-server = utf8mb4

collation-server = utf8mb4_unicode_ci

Bên CentOS chắc vẫn để 1 file my.cnf. MariaDB cũng dùng file cnf này thì fai.

Restart Server, quit client mysql rồi login lại.

Chạy:

mysql> SHOW VARIABLES WHERE Variable_name LIKE 'character\_set\_%' OR Variable_name LIKE 'collation%';

Như này là tươi:

+--------------------------+--------------------+

| Variable_name            | Value              |

+--------------------------+--------------------+

| character_set_client     | utf8mb4            |

| character_set_connection | utf8mb4            |

| character_set_database   | utf8mb4            |

| character_set_filesystem | binary             |

| character_set_results    | utf8mb4            |

| character_set_server     | utf8mb4            |

| character_set_system     | utf8               |

| collation_connection     | utf8mb4_unicode_ci |

| collation_database       | utf8mb4_unicode_ci |

| collation_server         | utf8mb4_unicode_ci |

+--------------------------+--------------------+

10 rows in set (0.00 sec)

thử insert/update 1 vài bản ghi utf8mb4 (emoji):

 152 |      51 | a hi hi    

 153 |       1 | 😜😀😊😃☢☠☡💀⚡☣ 

mysql> update instant_message set content = "😜😀😊😃☢☠☡💀⚡☣" where id = 140;

Query OK, 1 row affected (0.02 sec)

Rows matched: 1  Changed: 1  Warnings: 0

OK.

Với server (docker), account ko phải admin, bạn ko edit đc config MySQL từ file config lẫn command.

So what ?

Sẽ tìm cách xem xem và update sau.