timer

问题 I need a MySQL query for the following. I have a table of time duration as such below: `hsncs_tbl` +----+-----------------+ | Id | time_duration | +----+-----------------+ | 1 | 0:12 | ---- ----------------- | 2 | 0:18 | ---- ----------------- Using a MySQL query, I need to be able to calculate these time duration. So from the table above I would get the answer of 0:30. I tried this code many times, but still not working SELECT SEC_TO_TIME(SUM(TIME_TO_SEC(time_duration))) FROM hsncs_tbl Here

问题 My employer just asked me to run a timed batch process in a Java EE WebSphere application they have running. It's supposed to run a certain class at 11:30 pm everyday. I'm not very familiar with Java EE nor WebSphere server (or tomcat, in the development environment), and I've been digging around but all I've found is about the java timer class but not how to set it or invoke it. It seems that editing the web.xml file is required as well. Any help will be appreciated! 回答1: You should look at

问题 I'd like to stop my Countdown but it does not stops and still running I have this : import { Subscription } from 'rxjs/Subscription'; sub: Subscription; countDown; count; this.count = 100; this.countDown = Observable.timer(0, 1000) .take(this.count) .map(() => this.count = this.count-10); this.sub = Observable.interval(1000) .subscribe((val) => { if(this.count===0){ this.sub.unsubscribe(); } }); and when the timer equals to 0 it goes to -10, etc... Is there another way to stop that timer? 回答1

问题 I have read hundreds of pages and employed so many samples by now that I am completely confused. Most examples seems to target the following: Have a timer spawn a new thread that will do some work, with infinite threads Spawn a specific number of threads, each with a timer that does something On a regular basis do some work What I am trying to accomplish is: Have a timer running to regularly spawn a thread This thread may or may not take longer than the timer-tick Have a limit to how many

问题 I have read hundreds of pages and employed so many samples by now that I am completely confused. Most examples seems to target the following: Have a timer spawn a new thread that will do some work, with infinite threads Spawn a specific number of threads, each with a timer that does something On a regular basis do some work What I am trying to accomplish is: Have a timer running to regularly spawn a thread This thread may or may not take longer than the timer-tick Have a limit to how many

问题 I appear to have a memory leak in this piece of code. It is a console app, which creates a couple of classes (WorkerThread), each of which writes to the console at specified intervals. The Threading.Timer is used to do this, hence writing to the console is performed in a separate thread (the TimerCallback is called in a seperate thread taken from the ThreadPool). To complicate matters, the MainThread class hooks on to the Changed event of the FileSystemWatcher; when the test.xml file changes,

问题 In my Android application, I am using timer to show corresponding ImageViews using TIMER. I got an error 02-27 06:39:33.999: E/AndroidRuntime(1325): FATAL EXCEPTION: Timer-0 02-27 06:39:33.999: E/AndroidRuntime(1325): android.view.ViewRootImpl$CalledFromWrongThreadException: Only the original thread that created a view hierarchy can touch its views. 02-27 06:39:33.999: E/AndroidRuntime(1325): at android.view.ViewRootImpl.checkThread(ViewRootImpl.java:4746) 02-27 06:39:33.999: E/AndroidRuntime

问题 I am using countdown timer to show the left time in text view.It is working fine. Below is the code:-\ public class MyCount extends CountDownTimer { Context mContext; public MyCount(long millisInFuture, long countDownInterval) { super(millisInFuture, countDownInterval); } public void onTick (long millisUntilFinished) { MainActivity.timeDisplay.setText(formatTime(millisUntilFinished)); } public void onFinish() { AutomaticCallRecorderStaticMethod.startRecording(); } } public String formatTime

问题 I have an issue with a simple TTimer that's initiated and have its OnTimer event executed in the main app thread , the code looks like this: procedure TForm1.DoSomeStuff(); begin OmniLock.Acquire; try Parallel.Pipeline.NumTasks(MaxThreads).Stage(StageProc).Run; if (MyTimer = nil) then begin MyTimer := TTimer.Create(nil); MyTimer.Interval := 60 * 1000; // timer fired every 60 seconds MyTimer.OnTimer := MyTimerEvent; MyTimer.Enabled := True; end; finally OmniLock.Release; end; // try/finally

问题 I'm a MATLAB beginner and I would like to know how I can acquire and save 20 images at 5 second intervals from my camera. Thank you very much. 回答1: To acquire the image, does the camera comes with some documented way to control it from a computer? MATLAB supports linking to outside libraries. Or you can buy the appropriate MATLAB toolbox as suggested by MatlabDoug. To save the image, IMWRITE is probably the easiest option. To repeat the action, a simple FOR loop with a PAUSE will give you