Book Image

Hands-On High Performance Programming with Qt 5

By : Marek Krajewski
5 (1)
Book Image

Hands-On High Performance Programming with Qt 5

5 (1)
By: Marek Krajewski

Overview of this book

Achieving efficient code through performance tuning is one of the key challenges faced by many programmers. This book looks at Qt programming from a performance perspective. You'll explore the performance problems encountered when using the Qt framework and means and ways to resolve them and optimize performance. The book highlights performance improvements and new features released in Qt 5.9, Qt 5.11, and 5.12 (LTE). You'll master general computer performance best practices and tools, which can help you identify the reasons behind low performance, and the most common performance pitfalls experienced when using the Qt framework. In the following chapters, you’ll explore multithreading and asynchronous programming with C++ and Qt and learn the importance and efficient use of data structures. You'll also get the opportunity to work through techniques such as memory management and design guidelines, which are essential to improve application performance. Comprehensive sections that cover all these concepts will prepare you for gaining hands-on experience of some of Qt's most exciting application fields - the mobile and embedded development domains. By the end of this book, you'll be ready to build Qt applications that are more efficient, concurrent, and performance-oriented in nature
Table of Contents (14 chapters)

Connecting databases

Sometimes, data files aren't just stored on disk to be freely used, but are managed by a database runtime system. Fortunately, Qt provides us with the possibility to talk to SQL databases by using its QtSql module. We will take a cursory look at this, but general database performance is a big and deep field and lies outside of the scope of this book.

Basic example using SQLite

For this example, we will use the SQLite lightweight, in-memory database, because it is exceptionally simple to use.

To work with SQLite databases, you first have to install the SQLite tools, as the SQLite driver that's needed by Qt is already included in its installation. Go to https://www.sqlite.org/download.html, download...