public TimeOnly(int hour, int minute) public TimeOnly(int hour, int minute, int second) public TimeOnly(int hour, int minute, int second, int millisecond) 例如,為了表示上午10:30分,我們可以創(chuàng)建以下TimeOnly的實例。 1 var startT
.net 6中新增了一個異步計時器PeroidTimer,相對普通Timer的回調, 它的模型更簡單。 1 2 3 4 5 6 7 var second = TimeSpan.FromSeconds(3); using var timer = new PeriodicTimer(second); while (await timer.WaitForNextTickAsync()) { Console.WriteLine($"Tick {DateTime.Now}"); ...
1 1055 - Expression #1 of SELECT list is not in GROUP BY clause and contains nonaggregated column 'students.student.stuName' which is not functionally dependent on columns in GROUP BY clause; this is incompatible with sql_mode=only_full_group_by 以上兩個例子中group by單獨使用時,只顯示出每一...