"\xE4\xC5\xCC\xC9\xD3\xD8"是无效的。使用Python进行测试：

>>> "\xE4\xC5\xCC\xC9\xD3\xD8".decode("utf-8")
...
UnicodeDecodeError: 'utf8' codec can't decode bytes in position 0-2: invalid data

应该在连接之后这样做：

SET NAMES 'utf8';
SET CHARACTER SET utf8;

接下来，验证存储数据的表是否具有UTF 8字符集：

SELECT
  `tables`.`TABLE_NAME`,
  `collations`.`character_set_name`
FROM
  `information_schema`.`TABLES` AS `tables`,
  `information_schema`.`COLLATION_CHARACTER_SET_APPLICABILITY` AS `collations`
WHERE
  `tables`.`table_schema` = DATABASE()
  AND `collations`.`collation_name` = `tables`.`table_collation`
;

最后，检查数据库设置：

mysql> show variables like '%colla%';
mysql> show variables like '%charac%';