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How do I add indices to MySQL tables?
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ALTER TABLE `table` ADD INDEX `product_id_index` (`product_id`)
Never compare integer to strings in MySQL. If id is int, remove the quotes.
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Return index of greatest value in an array
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If you are utilizing underscore, you can use this nice short one-liner:
_.indexOf(arr, _.max(arr))
It will first find the value of the largest item in the array, in this case 22. Then it will return the index of where 22 is within the array, in this case 2.
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Is it possible to set the equivalent of a src attribute of an img tag in CSS?
...er-image: url("http://upload.wikimedia.org/wikipedia/commons/9/95/Christmas_bell_icon_1.png")
0 100% 100% 0;
}
<img width="300" height="120"
src="http://fc03.deviantart.net/fs71/f/2012/253/b/0/merry_christmas_card_by_designworldwide-d5e9746.jpg"
class="myClass"...
adding multiple entries to a HashMap at once in one statement
... 2016) as follow:
Map<String, Integer> cities = Map.of("Brussels", 1_139000, "Cardiff", 341_000);
The var-args case for Map is a little bit harder, you need to have both keys and values, but in Java, methods can’t have two var-args parameters. So the general case is handled by taking a va...
Is there some way to PUSH data from web server to browser?
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Yes, what you're looking for is COMET http://en.wikipedia.org/wiki/Comet_(programming). Other good Google terms to search for are AJAX-push and reverse-ajax.
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UICollectionView reloadData not functioning properly in iOS 7
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Force this on the main thread:
dispatch_async(dispatch_get_main_queue(), ^ {
[self.collectionView reloadData];
});
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Dealing with “java.lang.OutOfMemoryError: PermGen space” error
.../usr/share/tomcat6/bin/setenv.sh and added the following line to that: JAVA_OPTS="-Xms256m -Xmx512m -XX:+CMSClassUnloadingEnabled -XX:+CMSPermGenSweepingEnabled" - Restarted tomcat using: sudo /etc/init.d/tomcat6 start
– sami
Dec 10 '10 at 14:44
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Create a .csv file with values from a Python list
...th open(..., 'wb') as myfile:
wr = csv.writer(myfile, quoting=csv.QUOTE_ALL)
wr.writerow(mylist)
Edit: this only works with python 2.x.
To make it work with python 3.x replace wb with w (see this SO answer)
with open(..., 'w', newline='') as myfile:
wr = csv.writer(myfile, quoting=c...
Redis: Show database size/size for keys
...--------+---------------------------------------------------
notification_3109439 | 88.14% | 0.0% | 2 minutes
user_profile_3897016 | 11.86% | 99.98% | 20 seconds
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How to find the sum of an array of numbers
...MAScript 6), it can be this pretty:
const sum = [1, 2, 3].reduce((partial_sum, a) => partial_sum + a,0);
console.log(sum); // 6
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