摘要: #region 毫秒延时 界面不会卡死 public static void Delay(int mm) { DateTime current = DateTime.Now; while (current.AddMilliseconds(mm) > DateTime.Now) { Applicati 阅读全文
posted @ 2021-06-30 19:38 BloggerSb 阅读(974) 评论(1) 推荐(0)
摘要: 总结: mysql中: 1.isnull(exper) 判断exper是否为空,是则返回1,否则返回0 2.ifnull(exper1,exper2)判断exper1是否为空,是则用exper2代替 3.nullif(exper1,exper2)如果expr1= expr2 成立,那么返回值为NUL 阅读全文
posted @ 2021-06-30 19:33 BloggerSb 阅读(252) 评论(0) 推荐(0)