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Simulate CREATE DATABASE IF NOT EXISTS for PostgreSQL?
... not exist through JDBC. Unlike MySQL, PostgreSQL does not support create if not exists syntax. What is the best way to accomplish this?
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How to get the anchor from the URL using jQuery?
...ar hash = url.substring(url.indexOf("#")+1);
You can give it a try here, if it may not have a # in it, do an if(url.indexOf("#") != -1) check like this:
var url = "www.aaa.com/task1/1.3.html#a_1", idx = url.indexOf("#");
var hash = idx != -1 ? url.substring(idx+1) : "";
If this is the current...
Thread Safety in Python's dictionary
.../docs.python.org/glossary.html#term-global-interpreter-lock
This simplifies the CPython implementation by making the object model (including critical built-in types such as dict) implicitly safe against concurrent access.
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How to go back (ctrl+z) in vi/vim
...
I know that most of my answer is duplicated with those already present, but the value added of my answer is redo as Ctrl + r (lower case r) based on the documentation. Nobody before put it here. In addition, I tried to make the ...
iOS 7 parallax effect in my view controller
...dd both effects to your view
[myBackgroundView addMotionEffect:group];
Swift (Thanks to @Lucas):
// Set vertical effect
let verticalMotionEffect = UIInterpolatingMotionEffect(keyPath: "center.y",
type: .TiltAlongVerticalAxis)
verticalMotionEffect.minimumRelativeValue = -10
verticalMotionEffect.ma...
I ran into a merge conflict. How can I abort the merge?
...irst, and then examine the upstream changes (git log ..@{upstream} or git diff ..@{upstream}). After that, like you, I'll rebase my work.
– Pat Notz
May 14 '10 at 23:26
171
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Why does calling a function in the Node.js REPL with )( work?
...changed for 0.11.x, which will just wrap { ... } rather than all input:
if (/^\s*\{/.test(evalCmd) && /\}\s*$/.test(evalCmd)) {
// It's confusing for `{ a : 1 }` to be interpreted as a block
// statement rather than an object literal. So, we first try
// to wrap it in parenth...
How does Chrome's “Request Desktop Site” option work?
...work even if you originally typed in the URL for the mobile site. I don't know how its implemented because the name of mobile versions is by no means standardized, but there is something smarter going on than a simple UA change.
– Andrew G
Feb 3 '15 at 19:23
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Django, creating a custom 500/404 error page
...rial found here exactly, I cannot create a custom 500 or 404 error page. If I do type in a bad url, the page gives me the default error page. Is there anything I should be checking for that would prevent a custom page from showing up?
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What APIs are used to draw over other apps (like Facebook's Chat Heads)?
... that events outside of your display area go to the underlying UIs. You'll now find it works, but that other bad things still happen, like the back/menu buttons don't get directed to apps, plus no keyboard. To solve that you need FLAG_NOT_FOCUSABLE.
You get a side effect from the non-focusable bit ...