我在表中有一行定义为：
name character varying(255) NOT NULL
然而，使用symfony框架，当我尝试选择时，我得到以下错误，因为在一行中有一个“ü”字符。
[37;41m An exception occurred while executing 'SELECT t0.id AS id_1, t0.name AS name_2, t0.description AS description_3, t0.type AS type_4, t0.parent_id AS parent_id_5 FROM postgres.categori
es t0 ←[39;49m
←[37;41m WHERE t0.name = ? LIMIT 1' with params ["\x41\x6e\x7a\x81\x67\x65"]:
←[39;49m
←[37;41m SQLSTATE[22021]: Character not in repertoire: 7 FEHLER: ung├╝ltige Byte-Sequenz f├╝r Kodierung ┬╗UTF8┬½: 0x81
在教义中，dbal配置的字符集设置为UTF8。
我该如何纠正？即允许umlaut /ü字符