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#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
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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
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