大约有 13,700 项符合查询结果（耗时：0.0208秒） [XML]
Fastest check if row exists in PostgreSQL
...ex on contact, it can usually reduce time cost to 1 ms.
CREATE INDEX index_contact on contact(id);
share
|
improve this answer
|
follow
|
...
View a list of recent documents in Vim
...bro ol" is an abbreviation of ":browse oldfiles"
– Mr_Chimp
Sep 22 '11 at 16:04
28
To open one of...
Running V8 Javascript Engine Standalone
...
and if your on x86_64 do a: 'scons arch=x64' until its fixed in trunk code.google.com/p/v8/issues/detail?id=429#c1
– EdH
Sep 19 '11 at 3:15
...
How can I load storyboard programmatically from class?
...cond = "SecondViewController"
}
extension UIStoryBoard{
class func load(_ storyboard: StoryBoardName) -> UIViewController{
return UIStoryboard(name: storyboard.rawValue, bundle: nil).instantiateViewController(withIdentifier: storyboard.rawValue)
}
}
and then you can load your Storyb...
Execute JavaScript code stored as a string
...s called "Cross Site Scripting". See here: en.wikipedia.org/wiki/Cross-site_scripting.
– Brendon Shaw
Nov 18 '18 at 21:10
add a comment
|
...
Converting milliseconds to a date (jQuery/JavaScript)
...net
//*** It is covered under the license viewable at http://phrogz.net/JS/_ReuseLicense.txt
Date.prototype.customFormat = function(formatString){
var YYYY,YY,MMMM,MMM,MM,M,DDDD,DDD,DD,D,hhhh,hhh,hh,h,mm,m,ss,s,ampm,AMPM,dMod,th;
YY = ((YYYY=this.getFullYear())+"").slice(-2);
MM = (M=this.getM...
GitHub: Permission denied (publickey). fatal: The remote end hung up unexpectedly
... this solution seems very close to what has already been posted by learner_19
– Erik
Sep 17 '14 at 7:49
add a comment
|
...
Age from birthdate in python
...t(True) is 1 and int(False) is 0:
from datetime import date
def calculate_age(born):
today = date.today()
return today.year - born.year - ((today.month, today.day) < (born.month, born.day))
share
|
...
mysql Foreign key constraint is incorrectly formed error
...ISAM engine. It's a silly mistake, which I fixed with:
ALTER TABLE parent_table ENGINE=InnoDB;
share
|
improve this answer
|
follow
|
...
How does tuple comparison work in Python?
...
@CMCDragonkai -- yes. try: x = tuple([0 for _ in range(n)]) and do the same for y. Setting n=100, 1000, 10,000, and 100,000 and running %timeit x==y gave timing values of .5, 4.6, 43.9, and 443 microseconds respectively, which is about as close to O(n) as you can pra...