Book Image

Hands-On Embedded Programming with Qt

By : John Werner
Book Image

Hands-On Embedded Programming with Qt

By: John Werner

Overview of this book

Qt is an open source toolkit suitable for cross-platform and embedded application development. This book uses inductive teaching to help you learn how to create applications for embedded and Internet of Things (IoT) devices with Qt 5. You’ll start by learning to develop your very first application with Qt. Next, you’ll build on the first application by understanding new concepts through hands-on projects and written text. Each project will introduce new features that will help you transform your basic first project into a connected IoT application running on embedded hardware. In addition to gaining practical experience in developing an embedded Qt project, you will also gain valuable insights into best practices for Qt development and explore advanced techniques for testing, debugging, and monitoring the performance of Qt applications. The examples and projects covered throughout the book can be run both locally and on an embedded platform. By the end of this book, you will have the skills you need to use Qt 5 to confidently develop modern embedded applications.
Table of Contents (22 chapters)
Free Chapter
1
Section 1: Getting Started with Embedded Qt
5
Section 2: Working with Embedded Qt
10
Section 3: Deep Dive into Embedded Qt
14
Section 4: Advanced Techniques and Best Practices
Appendix A: BigProject Requirements

Keeping records

In this section, we will look at how we can store and retrieve data in Qt. In particular, we will work out a solution for yet another requirement.

Management has taken a look at what we have done so far with our BigProject, and they like it. Mostly. They did find something to ask about—Where is the old data? When you start the program, there is no history. Why don't we keep the old data so that we can see it? From that, and the conversations that followed, comes a new requirement:

Req. 7: The system shall maintain a history of readings across power cycles.

There are a lot of ways we could store data, but we are here to learn about how to use a database and Qt's database access methods. QSqlDatabase provides a generic interface to several database backends, including MySQL (and MariaDB), SQLite, IBM DB2, PostgreSQL, and generic ODBC (for example...