以下sql将清空网站所有数据内容，慎用。
truncate hm_attach;
truncate hm_attachment;
truncate hm_category;
truncate hm_cdkey;
truncate hm_price;
truncate hm_complain;
truncate hm_coupon;
truncate hm_coupon_log;
truncate hm_goods;
truncate hm_order;
truncate hm_sold;
truncate hm_user;
truncate hm_specification;