数据表修改字段
数据库：wiki
表名：tb_company_wiki_info
sql:
ALTER TABLE `tb_company_wiki_info` CHANGE `intro` `intro` VARCHAR(5000) CHARACTER SET utf8 COLLATE utf8_general_ci NULL DEFAULT '' COMMENT '用户填的企业简介';
ALTER TABLE `tb_company_wiki_info` CHANGE `intro_tmp` `intro_tmp` VARCHAR(5000) CHARACTER SET utf8 COLLATE utf8_general_ci NULL DEFAULT NULL COMMENT '修改简介的临时存放数据';