In the following, weight is declared as a mutable field.
type person = {
name: string;
mutable weight: int
};;
Remark: As far as design is concerned here, one would consider the fact that a person's name isn't likely to change, but their weight is.
You can use BETWEEN clause to replace a combination of "greater than equal AND less than equal" conditions.
Data
+----+-----------+
| id | username |
+----+-----------+
| 1 | admin |
| 2 | root |
| 3 | toor |
| 4 | mysql |
| 5 | thanks |
| 6 | java ...
This example is used in specifying options that might not be included in a database of available housing and its attendant amenities.
It builds on the previous example, with some differences:
Two procedures are no longer necessary for a single combo box, done by combining the code into a single ...
A simple way to catch unhandled errors (exceptions) in a VFP application is to use the ON ERROR command near the beginning of your main program.
The following ON ERROR command calls a method in the current program called "errorHandler". The values returned by ERROR (the VFP Error Number),...
enum ReadResult{
case Successful
case Failed
case Pending
}
struct OutpuData {
var data = Data()
var result: ReadResult
var error: Error?
}
func readData(from url: String, completion: @escaping (OutpuData) -> Void) {
var _data = OutpuData(data: Data(), ...
This shows you how to use Microsoft.Extensions.DependencyInjection nuget package without the use of the WebHostBuilder from kestrel (e.g. when you want to build something else then a webApp):
internal class Program
{
public static void Main(string[] args)
{
var services = new Se...
First of all you'll need to have a key pair. If you don't have one yet, take a look at the 'Generate public and private key topic'.
Your key pair is composed by a private key (id_rsa) and a public key (id_rsa.pub). All you need to do is to copy the public key to the remote host and add its contents...
QSize MainMenuListView::Header::sizeHint() const
{
// fontmetrics() allows to get the default font size for the widget.
return QSize(menu->headerAreaWidth(), fontMetrics().height());
}
void MainMenuListView::Header::paintEvent(QPaintEvent* event)
{
// Catches the paint event ...
MainWindow::MainWindow(QWidget *parent) : QMainWindow(parent)
{
QWidget* w = new QWidget(this);
QHBoxLayout* hbox = new QHBoxLayout();
QVBoxLayout* vBox = new QVBoxLayout();
menuA = new MainMenuListView(w, "Images");
menuB = new MainMenuListView(w, "Video...
Here is a sample output:
As you can seen above, it can be useful for creating stacked menus.
Note that this sample is trivial. The two widgets have the same size constraints.
The QTimer::singleShot is used to call a slot/lambda asynchronously after n ms.
The basic syntax is :
QTimer::singleShot(myTime, myObject, SLOT(myMethodInMyObject()));
with myTime the time in ms, myObject the object which contain the method and myMethodInMyObject the slot to call
So for exampl...
The grid layout is a powerful layout with which you can do an horizontal and vertical layout a once.
example:
#include "mainwindow.h"
#include <QApplication>
#include <QMainWindow>
#include <QWidget>
#include <QVBoxLayout>
#include <QPushButton>
#inc...
To set up a simple hibernate project using XML for the configurations you need 3 files, hibernate.cfg.xml, a POJO for each entity, and a EntityName.hbm.xml for each entity. Here is an example of each using MySQL:
hibernate.cfg.xml
<?xml version="1.0" encoding="utf-8"?>
&...
