大约有 48,000 项符合查询结果（耗时：0.0733秒） [XML]
Checking if an Android application is running in the background
... completely reliable:
The right solution (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 o...
What regex will match every character except comma ',' or semi-colon ';'?
...tion you are using. Most of them have a Split method that takes delimiters and split by them. You might want to use that one with a "normal" (without ^) character class:
[,;]+
share
|
improve this...
HEAD and ORIG_HEAD in Git
What do these symbols refer to and what do they mean?
4 Answers
4
...
Replace a newline in TSQL
...
Actually a new line in a SQL command or script string can be any of CR, LF or CR+LF. To get them all, you need something like this:
SELECT REPLACE(REPLACE(@str, CHAR(13), ''), CHAR(10), '')
...
How do I parse an ISO 8601-formatted date?
...atetime strings like the one in the question, but also other ISO 8601 date and time strings that don't comply with RFC 3339 (such as ones with no UTC offset, or ones that represent only a date).
>>> import dateutil.parser
>>> dateutil.parser.isoparse('2008-09-03T20:56:35.450686Z'...
What exactly is a reentrant function?
...rant?
No.
For example, let's have a C++ function that takes both a lock, and a callback as a parameter:
#include <mutex>
typedef void (*callback)();
std::mutex m;
void foo(callback f)
{
m.lock();
// use the resource protected by the mutex
if (f) {
f();
}
// u...
What is a web service endpoint?
... say my web service is located at http://localhost:8080/foo/mywebservice and my WSDL is at http://localhost:8080/foo/mywebservice?wsdl .
...
Does MySQL ignore null values on unique constraints?
...sult:
x
NULL
NULL
1
This is not true for all databases. SQL Server 2005 and older, for example, only allows a single NULL value in a column that has a unique constraint.
share
|
improve this answ...
What is the difference between
... edited Aug 11 at 9:09
Alexandr Nil
14111 gold badge55 silver badges1010 bronze badges
answered Nov 3 '11 at 14:44
...
Declaring variables inside loops, good practice or bad practice?
...
The compiler knows that the variable scope is limited to inside the loop, and therefore will issue a proper error message if the variable is by mistake referenced elsewhere.
Last but not least, some dedicated optimization can be performed more efficiently by the compiler (most importantly register ...