查询字符编码
SHOW VARIABLES WHERE Variable_name LIKE 'character_set_%' OR Variable_name LIKE 'collation%';
修改数据库字符编码
ALTER DATABASE soc CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci;
修改表字符编码
ALTER TABLE sys_project_info CONVERT TO CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci;
