mysql 我定义了一个字段为 varchar(255)我想把长度改的大一点,怎么弄(是用varchar不换成其他的类型)??看过好多文章说是 utf-8 的改为varchar(21845),但提出警告#1118 - Row size too large. The maximum row size for the used table type, not counting BLOBs, is 65535. You have to change some columns to TEXT or BLOBs