[MySql] 保存 emoji

-- 修改数据库字符集
ALTER DATABASE my_db CHARACTER SET = utf8mb4 COLLATE = utf8mb4_unicode_ci;
ALTER DATABASE `dev_db` DEFAULT CHARACTER SET utf8mb4 DEFAULT COLLATE utf8mb4_unicode_ci;


-- 修改表的字符集
ALTER TABLE my_tab CONVERT TO CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci;
ALTER TABLE my_tab DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;


-- 修改字段的字符集 
ALTER TABLE my_tab MODIFY COLUMN content varchar(64) CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci;

SHOW VARIABLES WHERE Variable_name LIKE 'char%';

SHOW FULL COLUMNS FROM my_tab ;