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Qt: How do I handle the event of the user pressing the 'X' (close) button?
...>
void MainWindow::closeEvent (QCloseEvent *event)
{
QMessageBox::StandardButton resBtn = QMessageBox::question( this, APP_NAME,
tr("Are you sure?\n"),
QMessageBox::...
Best way to select random rows PostgreSQL
I want a random selection of rows in PostgreSQL, I tried this:
12 Answers
12
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PHP array delete by value (not key)
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Using array_search() and unset, try the following:
if (($key = array_search($del_val, $messages)) !== false) {
unset($messages[$key]);
}
array_search() returns the key of the element it finds, which can be used to remove that element from ...
How can I change the copyright template in Xcode 4?
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Xcode 4 (and above) stores this on a per-project basis.
If you select the project in the Project Navigator (Cmd-1) and open the File Inspector (Cmd-Opt-1), you'll see a field for "Organization" under "Project Document".
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Is it unnecessary to put super() in constructor?
... or protected or, if both classes are in the same package, package access; and
Default constructor: the public no-args constructor added by the compiler when there is no explicit constructor in the class.
So all classes have at least one constructor.
Subclasses constructors may specify as the fir...
Can you use an alias in the WHERE clause in mysql?
...e performance implications since HAVING executes after the data is fetched and WHERE executes before.
– StockB
Feb 15 '17 at 19:16
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Can I add a UNIQUE constraint to a PostgreSQL table, after it's already created?
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I needed an answer to this very question and started googling for the docs. Instead of the Postgres documentation, I ran into this topic at StackOverflow. So although it's a good think to reference the official docs, it's also very good to give the answer for future...
AngularJS - convert dates in controller
...rkup/input.date.html
NOTE: use of pattern="" with type="date" looks non-standard, but it appears to work in the expected way in Chrome 31.
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How to find out what type of a Mat object is with Mat::type() in OpenCV
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Here is a handy function you can use to help with identifying your opencv matrices at runtime. I find it useful for debugging, at least.
string type2str(int type) {
string r;
uchar depth = type & CV_MAT_DEPTH_MASK;
uchar cha...
When to use Vanilla JavaScript vs. jQuery?
...ing javascript, instead of jQuery, that actually enable you to write less and do ... well the same amount. And may also yield performance benefits.
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