ALTER TABLE b_need_info ADD COLUMN wechat_no VARCHAR(100) DEFAULT NULL COMMENT '微信号'; 
ALTER TABLE b_need_info ADD COLUMN email VARCHAR(100) DEFAULT NULL COMMENT '邮箱'; 

ALTER TABLE b_order_delivery ADD COLUMN wechat_no VARCHAR(100) DEFAULT NULL COMMENT '微信号'; 
ALTER TABLE b_order_delivery ADD COLUMN email VARCHAR(100) DEFAULT NULL COMMENT '邮箱'; 