Firebird → Updating table data based on a selection from another table using EXECUTE BLOCK

execute block, FireBird

Good day!
More work notes.
There was a need to update the data on the IP addresses of the database servers on the objects.
Those. Based on the result of the SELECT, perform an UPDATE on another table.

We will …

PyQt5 → PyQt5 - Tutorial 009. Using QThread with MoveToThread

moveToThread, QObject, QThread, PyQt5, Qt

Based on one of the questions on the forum, I wrote an example on using QThread in PyQt5, as well as using the moveToThread method to move the class object of the inherited QObject to another thread.

In this example, …

QML → QML - Tutorial 038. Using the clip property to crop child objects inside Item or Rectangle

clip, ListView, OpacityMask, QML

Quite often, the same question arises on the forum regarding the problem of displaying content embedded in any QML objects.

The most common manifestation of this problem is when ListView content scrolls beyond its scope. In any case, this is …

GameDev → Valve To Release Source 2 Tools With Half-Life: Alyx Next March

Valve, Half-Life, VR, Tools

The last entry in the Half-Life series was a very long time ago, so there are more developer tools based on Valve's current Source 2 internal engine.

Along with today's official reveal of their exclusive VR game Half-Life: Alyx, Valve …

Django → Django - Tutorial 050. Creating Dynamic Site Settings Using SingletonModel

SingletonModel, Model, Django, singleton

Let's say you create a site with CMS based on Django, which must have some kind of dynamic site settings that will be available to the user. For example, the name of the site, some specialized information, while you take …

Qt → Efficient QString Concatenation with Folding C ++ 17 Template Parameters

qt, QString, expression

It's common in C++ to have operator+to perform string concatenation, whether you're using the standard library (or STL) or Qt. This allows you to write things like the following snippet:

QString statement{"I'm not"};
QString number{"a number"};
QString space{" "};
QString …

MySQL → Building the QMYSQL driver (MariaDB) Windows 10 x64 QT 5.13.0 Mingw73_64

QIBASE, mysql, драйвер, MariaDB

Good day!

Installed:
Windows 10 x64
Qt 5.13.0 installed in c:\Qt\
The database server runs on Linux OS.
mysql Ver 15.1 Distrib 10.3.18-MariaDB, for Linux (x86_64) using readline 5.1

Download the 64 bit version of MariaDB because Mingw is 64 …

PyQt5 → PyQt5 - Tutorial 008. Working with QTableWidget (Update tutorial 006)

PyQt5, QTableWidget

This will be a small update to the lesson on using QTableWidget in PyQt5

In the previous lesson it was shown how to display some kind of information in QTableWidget. And this lesson will also show how to make some …

QML → QML - Tutorial 037. Customizing Buttons in QML (Update Lesson 002)

Custom Button QML, Custom, QML

At the request of one of the users, I am updating one of the first lessons in accordance with the current status of Qt. Namely, a new lesson will be written using Qt Quick Controls 2.

Namely, we customize the …

Qt → A fast and thread-safe pool allocator for Qt - Part 2

Qt, allocator, thread, performance

The first part of this article series looked at a pool allocator optimized for small allocations. The developers have said that they do a lot in Qt by allocating QEvent or QObject instances, and a specialized allocator can be useful …