oracle ORA-01704: string literal too long问题分析

今天使用sql在oracle直接insert update一个表时，出现ORA-01704: string literal too long的错误，我们的sql是

update mall_config set category_info='安全防护:3003,' where id=1;update mall_config set category_info=category_info||'|标准件:1040140,1035382,' where id=1;