无详细内容 MySQL ALTER DATABASE my_database DEFAULT CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci;ALTER TABLE my_table CONVERT TO CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci;
MySQLALTER DATABASE my_database DEFAULT CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci; ALTER TABLE my_table CONVERT TO CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci;