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How to implement a Map with multiple keys? [duplicate]
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Two maps. One Map<K1, V> and one Map<K2, V>. If you must have a single interface, write a wrapper class that implements said methods.
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When to use virtual destructors?
I have a solid understanding of most OOP theory but the one thing that confuses me a lot is virtual destructors.
17 Answe...
Javascript Drag and drop for touch devices [closed]
...work on touch devises
or you can use this code which I am using, it also converts mouse events into touch and it works like magic.
function touchHandler(event) {
var touch = event.changedTouches[0];
var simulatedEvent = document.createEvent("MouseEvent");
simulatedEvent.initMous...
Safe characters for friendly url [closed]
...he question, you should only allow these characters:
Lower case letters (convert upper case to lower)
Numbers, 0 through 9
A dash - or underscore _
Tilde ~
Everything else has a potentially special meaning. For example, you may think you can use +, but it can be replaced with a space. & is ...
PHP code to remove everything but numbers
...9]/', '', '604-619-5135');
preg_replace uses PCREs which generally start and end with a /.
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Is there any difference between a GUID and a UUID?
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Note that if you want to convert from Microsoft's GUID binary representation to a standard UUID you'll have to flip endianness of the first three (of four) data fields as detailed in the "Binary encoding" section here: en.wikipedia.org/wiki/Globally_...
Set a DateTime database field to “Now”
...setting the SQLparameter to DateTime.Now will do this or If I should first convert the date to a string and then add it to the request ?
– Thibault Witzig
Dec 20 '10 at 9:41
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Split value from one field to two
I've got a table field membername which contains both the last name and the first name of users. Is it possible to split those into 2 fields memberfirst , memberlast ?
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How to add column if not exists on PostgreSQL?
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Here's a short-and-sweet version using the "DO" statement:
DO $$
BEGIN
BEGIN
ALTER TABLE <table_name> ADD COLUMN <column_name> <column_type>;
EXCEPTION
WHEN duplicate_column THE...
How to make MySQL handle UTF-8 properly
...set and character-set-server).
If you have existing data that you wish to convert to UTF-8, dump your database, and import it back as UTF-8 making sure:
use SET NAMES utf8 before you query/insert into the database
use DEFAULT CHARSET=utf8 when creating new tables
at this point your MySQL client a...