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How to select rows with no matching entry in another table?
I'm doing some maintenance work on a database application and I've discovered that, joy of joys, even though values from one table are being used in the style of foreign keys, there's no foreign key constraints on the tables.
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How do I update pip itself from inside my virtual environment?
...ng to pip --version , I currently have pip 1.1 installed in my virtualenv and I want to update to the latest version.
16 ...
What is Double Brace initialization in Java?
...es an anonymous class derived from the specified class (the outer braces), and provides an initialiser block within that class (the inner braces). e.g.
new ArrayList<Integer>() {{
add(1);
add(2);
}};
Note that an effect of using this double brace initialisation is that you're creating...
Remove URL parameters without refreshing page
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TL;DR
1- To modify current URL and add / inject it (the new modified URL) as a new URL entry to history list, use pushState:
window.history.pushState({}, document.title, "/" + "my-new-url.html");
2- To replace current URL without adding it to history en...
PHP script - detect whether running under linux or Windows?
... placed on a windows system or a linux system. I need to run different commands in either case.
14 Answers
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Return array in a function
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Is kind of just syntactic sugar. You could really replace it with this and it would still work:
int fillarr(int* arr)
So in the same sense, what you want to return from your function is actually a pointer to the first element in the array:
int* fillarr(int arr[])
And you'll still be able t...
Changing one character in a string
...code capable applications in C. But you have to care about it all the time and need to test it explicitly to avoid trouble. Everything is machine-oriented. I worked with PHP before learning Python, and that language is a total mess. Regarding your note on fast CPUs I'm totally with you. But a part o...
What is the best way to prevent session hijacking?
... when a user visits one of your "sensitive" areas, redirect them to HTTPS, and check for the presence of that secure cookie. A real user will have it, a session hijacker will not.
EDIT: This answer was originally written in 2008. It's 2016 now, and there's no reason not to have SSL across your enti...
jquery: $(window).scrollTop() but no $(window).scrollBottom()
... <div> that has to be a certain distance from the bottom of the page and the page has expandable/collapsible items, it's going to change the body height and therefore the distance from the bottom.
– crash springfield
Apr 28 '17 at 19:10
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Why does Windows64 use a different calling convention from all other OSes on x86-64?
...?BX, ?SP, ?BP, ?SI, ?DI.
Hence choosing A/C/D (regs 0..2) for return value and the first two arguments (which is the "classical" 32bit __fastcall convention) is a logical choice. As far as going to 64bit is concerned, the "higher" regs are ordered, and both Microsoft and UN*X/Linux went for R8 / R9 ...