sess := eg.Where("uid=0 and num>0 and is_use=1").OrderBy("sort desc,id desc").Limit(limit, start)
sess := eg.Where("store_type=0 and num>0 and state=1 and ((valid_time_end>? and valid_time_type=1) or valid_time_type=2)", time.Now().Format("2006-01-02 15:04:05")).OrderBy("sort desc,id desc").Limit(limit, start)