帝国增加字段提示Row size too large，怎么解决

增加字段提示以下信息，如何解决？
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
alter table ***_ecms_infoclass_info add zz_jdtype text not null,add z_jdtype varchar(255) not null,add qz_jdtype varchar(255) not null,add save_jdtype varchar(10) not null;

超过mysql允许的最大单表长度，解决办法是：减少字段，或字段少用text类型