1、修改数据库字符集(可选但推荐
ALTER DATABASE your_database_name CHARACTER SET = utf8mb4 COLLATE = utf8mb4_unicode_ci;2、修改表字符集
ALTER TABLE your_table_name CONVERT TO CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci;3、确保特定字段也是 utf8mb4(通常上一步已覆盖,但可显式指定)
ALTER TABLE your_table_name MODIFY `from` VARCHAR(255) CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci;