大约有 15,462 项符合查询结果（耗时：0.0187秒） [XML]
Which timestamp type should I choose in a PostgreSQL database?
... NULL DEFAULT NOW(),
CHECK(EXTRACT(TIMEZONE FROM my_timestamp) = '0')
);
test=> SET timezone = 'America/Los_Angeles';
SET
test=> INSERT INTO my_tbl (my_timestamp) VALUES (NOW());
ERROR: new row for relation "my_tbl" violates check constraint "my_tbl_my_timestamp_check"
test=> SET timezon...
Package structure for a Java project?
... you have a choice. It's a well-thought out structure that has been battle-tested, and is familiar to many developers.
– Dov Wasserman
Oct 17 '08 at 4:46
15
...
Performance of foreach, array_map with lambda and array_map with static function
...osure was caused by the closure possibly being evaluated each time, I also tested like this:
function useMapClosure($numbers) {
$closure = function($number) {
return $number * 10;
};
return array_map($closure, $numbers);
}
But the results are identical, confirming that the closure is ...
Test a weekly cron job [closed]
...er the script will actually work when run from cron. Use the excellent crontest script in one of the other answers to this question.
– andynormancx
Apr 24 '16 at 14:38
...
How can I perform a culture-sensitive “starts-with” operation from the middle of a string?
...ex, ref length2, options))
return length2;
}
}
I tested with the particular case, and the comparision down to about 3.
share
|
improve this answer
|
...
How do I trim leading/trailing whitespace in a standard way?
...endp++ = *frontp++; }
*endp = '\0';
}
return str;
}
Test for correctness:
#include <stdio.h>
#include <string.h>
#include <ctype.h>
/* Paste function from above here. */
int main()
{
/* The test prints the following:
[nothing to trim] -> [nothin...
Flattening a shallow list in Python [duplicate]
...
An explicit loop that uses .extend method is the fastest solution according to this benchmark
– jfs
Apr 30 '14 at 2:02
...
Why is ArrayDeque better than LinkedList
...f you want to know, take a look at the below benchmark done by Brian.
The test setup considers:
Each test object is a 500 character String. Each String is a different object in memory.
The size of the test array will be varied during the tests.
For each array size/Queue-implementation...
Do Swift-based applications work on OS X 10.9/iOS 7 and lower?
...
I just tested it for you, Swift applications compile into standard binaries and can be run on OS X 10.9 and iOS 7.
Simple Swift application used for testing:
func application(application: UIApplication, didFinishLaunchingWithOpt...
Select distinct using linq [duplicate]
...
myList.GroupBy(test => test.id)
.Select(grp => grp.First());
Edit: as getting this IEnumerable<> into a List<> seems to be a mystery to many people, you can simply write:
var result = myList.GroupBy(test => tes...