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In Postgresql, force unique on combination of two columns
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CREATE TABLE someTable (
id serial primary key,
col1 int NOT NULL,
col2 int NOT NULL,
unique (col1, col2)
)
autoincrement is not postgresql. You want a serial.
If col1 and col2 make a unique and can't be null then they ma...
What is the difference between cout, cerr, clog of iostream header in c++? When to use which one?
...t answer. I still am not clear on when to use which. Can anyone explain to me, through simple programs and illustrate a perfect situation on when to use which one?
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Private and protected constructor in Scala
...private/protected by inserting the appropriate keyword between the class name and the parameter list, like this:
class Foo private () {
/* class body goes here... */
}
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Moving and vanishing lines of code; trouble with Eclipse's XML Editor
Sometimes my code moves on its own or just disappears in the Eclipse XML editor.
7 Answers
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Can anybody find the TFS “Unshelve” option in Visual Studio 2012?
... today, but now I can't seem to find a way to unshelve them! This has left me in quite a predicament!
5 Answers
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Ruby: How to turn a hash into HTTP parameters?
...removed from the gem.
Julien, your self-answer is a good one, and I've shameless borrowed from it, but it doesn't properly escape reserved characters, and there are a few other edge cases where it breaks down.
require "addressable/uri"
uri = Addressable::URI.new
uri.query_values = {:a => "a", :...
C# difference between == and Equals()
...ve a condition in a silverlight application that compares 2 strings, for some reason when I use == it returns false while .Equals() returns true .
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Example of UUID generation using Boost in C++
...n't manage to generate the UUID because I don't understand which class and method to use.
2 Answers
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Make header and footer files to be included in multiple html pages
...</html>
and put this code in header.html and footer.html, at the same location as index.html
<a href="http://www.google.com">click here for google</a>
Now, when you visit index.html, you should be able to click the link tags.
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Will iOS launch my app into the background if it was force-quit by the user?
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UPDATE2:
You can achieve this using the new PushKit framework, introduced in iOS 8. Though PushKit is used for VoIP. So your usage should be for VoIP related otherwise there is risk of app rejection. (See this answer).
UDPDATE1:
The documentation has been clarified for iOS8. ...