alter table js_sys_office default character set utf8mb4 collate=utf8mb4_0900_ai_ci;
ALTER TABLE js_sys_office convert to CHARACTER SET utf8mb4 COLLATE utf8mb4_0900_ai_ci;
utf8mb4_general_ci //无用编码格式
alter table js_sys_office default character set utf8mb4 collate=utf8mb4_0900_ai_ci;
ALTER TABLE js_sys_office convert to CHARACTER SET utf8mb4 COLLATE utf8mb4_0900_ai_ci;
utf8mb4_general_ci //无用编码格式