大约有 45,000 项符合查询结果（耗时：0.0702秒） [XML]
Why is 1/1/1970 the “epoch time”?
...
425
Early versions of unix measured system time in 1/60 s intervals. This meant that a 32-bit unsig...
Rails where condition using NOT NIL
... |
edited Nov 7 '18 at 23:38
answered Nov 23 '10 at 3:51
...
Rails :include vs. :joins
...
It appears that the :include functionality was changed with Rails 2.1. Rails used to do the join in all cases, but for performance reasons it was changed to use multiple queries in some circumstances. This blog post by Fabio Akita has some good information on the change (see the section e...
Upload files with HTTPWebrequest (multipart/form-data)
...
21 Answers
21
Active
...
Is the practice of returning a C++ reference variable evil?
...
420
In general, returning a reference is perfectly normal and happens all the time.
If you mean:
...
jQuery UI “ $(”#datepicker“).datepicker is not a function”
...
211
I struggled with a similar problem for hours. It then turned out that jQuery was included twic...
Re-entrant locks in C#
... webpage describing thread synchronisation in .NET: http://dotnetdebug.net/2005/07/20/monitor-class-avoiding-deadlocks/
Also, lock on as few objects at a time as possible. Consider applying coarse-grained locks where possible. The idea being that if you can write your code such that there is an obj...
How to set the maximum memory usage for JVM?
...
|
edited Feb 27 '14 at 15:23
Erik Kaplun
31.6k1111 gold badges8888 silver badges9696 bronze badges
...
Preview layout with merge root tag in Intellij IDEA/Android Studio
...
There is a new parentTag tools attribute (added in Android Studio 2.2) that you can use to specify the layout type for a merge tag, which will make the layout render correctly in the layout editor preview.
So using your example:
<merge xmlns:android="http://schemas.android.com/apk/res...
Calculate the execution time of a method
... |
edited Dec 9 '17 at 12:27
Matthias Braun
22k1616 gold badges104104 silver badges138138 bronze badges
...