Book Image

Qt5 C++ GUI Programming Cookbook. - Second Edition

By : Lee Zhi Eng
Book Image

Qt5 C++ GUI Programming Cookbook. - Second Edition

By: Lee Zhi Eng

Overview of this book

With the growing need to develop GUIs for multiple targets and multiple screens, improving the visual quality of your application becomes important so that it stands out from your competitors. With its cross-platform ability and the latest UI paradigms, Qt makes it possible to build intuitive, interactive, and user-friendly user interfaces for your applications. Qt5 C++ GUI Programming Cookbook, Second Edition teaches you how to develop functional and appealing user interfaces using the latest version of QT5 and C++. This book will help you learn a variety of topics such as GUI customization and animation, graphics rendering, implementing Google Maps, and more. You will also be taken through advanced concepts like asynchronous programming, event handling using signals and slots, network programming, various aspects of optimizing your application. By the end of the book, you will be confident to design and customize GUI applications that meet your clients' expectations and have an understanding of best practice solutions for common problems.
Table of Contents (15 chapters)

Writing basic SQL queries

In the previous example, we wrote our very first SQL query, which involves the SELECT statement. This time, we will learn how to use some other SQL statements, such as INSERT, UPDATE, and DELETE.

How to do it...

Let's create a simple program that demonstrates basic SQL query commands by following these steps:

  1. We can use our previous project files, but there are a couple of things we need to change. Open mainwindow.ui and replace the labels for Name and Age with line-edit widgets. Then, add three buttons to the canvas and call them UPDATE, INSERT, and DELETE:
  1. Open mainwindow.h and add the following variables under the private inheritance:
private:
Ui::MainWindow *ui;
QSqlDatabase db...