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In the Project.pro file we add : CONFIG += sql in MainWindow.h we write : #include <QMainWindow> #include <QSql> #include <QDebug> namespace Ui { class MainWindow; } class MainWindow : public QMainWindow { Q_OBJECT public: explicit MainWindow(QWidget...

Layout Unity basic editor will look like below. Basic functionalities of some default windows/tabs are described in the image. Linux Layout There is a little difference in menu layout of linux version, like the screenshot below, Basic Usage Create an empty GameObject by right clicking in th...

Using the default constructor T variable = Activator.CreateInstance(typeof(T)); Using parameterized constructor T variable = Activator.CreateInstance(typeof(T), arg1, arg2);

Occasionally you'd want to catch an exception and throw it from a different thread or method while preserving the original exception stack. This can be done with ExceptionDispatchInfo: using System.Runtime.ExceptionServices; void Main() { ExceptionDispatchInfo capturedException = null; ...

Whenever a Python script is invoked from the command line, the user may supply additional command line arguments which will be passed on to the script. These arguments will be available to the programmer from the system variable sys.argv ("argv" is a traditional name used in most programmi...

You can count the number of rows: SELECT count(*) TotalRows FROM employees; TotalRows4 Or count the employees per department: SELECT DepartmentId, count(*) NumEmployees FROM employees GROUP BY DepartmentId; DepartmentIdNumEmployees1321 You can count over a column/expression with the eff...

To install Eclipse RCP follow the steps : Download Eclipse RCP/RAP version from Eclipse.org Eclipse RCP/RAP project downloading URL

Good unit tests are independent, but code often has dependencies. We use various kinds of test doubles to remove the dependencies for testing. One of the simplest test doubles is a stub. This is a function with a hard-coded return value called in place of the real-world dependency. // Test that ...

If you are able to download an update of Android Studio, but after it restarts nothing happens, check out the following example: After the patch was downloaded and Android Studio closed, open the terminal Go to your android studio folder, e.g. cd ~/android-studio Go to bin subfolder: cd bin ...

val emailRegex: Regex = "(.+)@(.+)\\.(.+)".r "[email protected]" match { case emailRegex(userName, domain, topDomain) => println(s"Hi $userName from $domain") case _ => println(s"This is not a valid email.") } In this example, the regex attem...

Messages printed from NSLog are displayed on Console.app even in the release build of your app, which doesn't make sense for printouts that are only useful for debugging. To fix this, you can use this macro for debug logging instead of NSLog. #ifdef DEBUG #define DLog(...) NSLog(__VA_ARGS__) #els...

To use Leaflet, load its stylesheet and JavaScript file to your page: <link rel="stylesheet" href="/css/leaflet.css" /> <script src="/js/leaflet.js"></script> These resources can be downloaded from a variety of locations such as Leaflet's homepage...

First, import the libraries that work with files: from os import listdir from os.path import isfile, join, exists A helper function to read only files from a directory: def get_files(path): for file in listdir(path): full_path = join(path, file) if isfile(full_path): ...

Syntax: add_months(p_date, integer) return date; Add_months function adds amt months to p_date date. SELECT add_months(date'2015-01-12', 2) m FROM dual; M2015-03-12 You can also substract months using a negative amt SELECT add_months(date'2015-01-12', -2) m FROM dual; M2014-11-12 When the...

public static class ThreadLocalExample { private static final ThreadLocal<SimpleDateFormat> format = ThreadLocal.withInitial(() -> new SimpleDateFormat("yyyyMMdd_HHmm")); public String formatDate(Date date) { return format.get().format(date); ...

where clause By adding a where clause you can restrict the iterations to ones that satisfy the given condition. for i in 0..<5 where i % 2 == 0 { print(i) } // 0 // 2 // 4 let names = ["James", "Emily", "Miles"] for name in names where name.c...

PHP has great official documentation already at http://php.net/manual/. The PHP Manual documents pretty much all language features, the core libraries and most available extensions. There are plenty of examples to learn from. The PHP Manual is available in multiple languages and formats. Best of al...

If you need to call an Objective-C method from C code, you have two ways: using objc_msgSend, or obtaining the IMP (method implementation function pointer) and calling that. #import <objc/objc.h> @implementation Example - (double)negate:(double)value { return -value; } - (doubl...

NSArray *array = @[ @{ @"id": @"7CDF6D22-8D36-49C2-84FE-E31EECCECB71", @"title": @"Jackie Chan Strike Movie", @"url": @"http://abc.com/playback.m3u8&...

// *** Find movies except given ids *** NSPredicate *filterByNotInIds = [NSPredicate predicateWithFormat:@"NOT (self.id IN %@)",@[@"7CDF6D22-8D36-49C2-84FE-E31EECCECB79", @"7CDF6D22-8D36-49C2-84FE-E31EECCECB76"]]; NSLog(@"Filter movies except given Ids : %@"...