大约有 12,000 项符合查询结果（耗时：0.0222秒） [XML]
Storing time-series data, relational or non?
...able is instantaneous).
Your table has one serious impediment. Given your description, the actual PK is (Device, Metric, DateTime). (Please don't call it TimeStamp, that means something else, but that is a minor issue.) The uniqueness of the row is identified by:
(Device, Metric, DateTime)
...
How to get error information when HttpWebRequest.GetResponse() fails
... it's response. Occasionally, I get a 500 (or at least 5##) error, but no description. I have control over both endpoints and would like the receiving end to get a little bit more information. For example, I would like to pass the exception message from server to client. Is this possible using H...
System.Threading.Timer in C# it seems to be not working. It runs very fast every 3 second
...this is a strict requirement or not (not entirely clear from the problem's description).
– Marco Mp
Oct 9 '12 at 9:26
...
How to check if activity is in foreground or in visible background?
...credits go to Dan, CommonsWare and NeTeInStEiN)
Track visibility of your application by yourself using
Activity.onPause, Activity.onResume methods. Store "visibility" status
in some other class. Good choices are your own implementation of the
Application or a Service (there are also a few va...
Syntax behind sorted(key=lambda: …)
... does in the context of sorted() quite nicely, however I still feel like a description that leads to an intuitive understanding is lacking, so here is my two cents.
For the sake of completeness, I'll state the obvious up front: sorted() returns a list of sorted elements and if we want to sort in a...
What does the Visual Studio “Any CPU” target mean?
...64 platform, then you won't be able to load 32-bit DLL files, because your application wasn't started in WoW64, but those DLL files need to run there.
If you compile as x86, then the x64 system will run your application in WoW64, and you'll be able to load 32-bit DLL files.
So I think you should c...
What's the best way to do “application settings” in Android? [closed]
I'd like to store some application settings (like the URL of an API, and some settings for testing) for an Android application.
...
First-time database design: am I overengineering? [closed]
...) or inactive (no sessions remaining). By more clarity, do you mean a more descriptive name for the col? E.g. enrolment_status? Thanks for your input.
– bob esponja
Feb 23 '10 at 19:24
...
How to programmatically take a screenshot on Android?
...s", now);
try {
// image naming and path to include sd card appending name you choose for file
String mPath = Environment.getExternalStorageDirectory().toString() + "/" + now + ".jpg";
// create bitmap screen capture
View v1 = getWindow().getDecorView().getRoo...
S3 Static Website Hosting Route All Paths to Index.html
I am using S3 to host a javascript app that will use HTML5 pushStates. The problem is if the user bookmarks any of the URLs, it will not resolve to anything. What I need is the ability to take all url requests and serve up the root index.html in my S3 bucket, rather than just doing a full redirect. ...