Book Image

Mastering Qt 5 - Second Edition

By : Guillaume Lazar, Robin Penea
Book Image

Mastering Qt 5 - Second Edition

By: Guillaume Lazar, Robin Penea

Overview of this book

Qt 5.11 is an app development framework that provides a great user experience and develops full capability applications with Qt Widgets, QML, and even Qt 3D. Whether you're building GUI prototypes or fully-fledged cross-platform GUI applications with a native look and feel, Mastering Qt 5 is your fastest, easiest, and most powerful solution. This book addresses various challenges and teaches you to successfully develop cross-platform applications using the Qt framework, with the help of well-organized projects. Working through this book, you will gain a better understanding of the Qt framework, as well as the tools required to resolve serious issues, such as linking, debugging, and multithreading. You'll start off your journey by discovering the new Qt 5.11 features, soon followed by exploring different platforms and learning to tame them. In addition to this, you'll interact with a gamepad using Qt Gamepad. Each chapter is a logical step for you to complete in order to master Qt. By the end of this book, you'll have created an application that has been tested and is ready to be shipped.
Table of Contents (16 chapters)

Storing your data in a database

Now that the data classes are ready, we can implement the database layer. Qt provides a ready-to-use sql module. Various databases are supported in Qt using SQL database drivers. In gallery-desktop, we will use the SQLITE driver, which is included in the sql module and perfectly fits the use case:

  • A very simple database schema: No need for complex queries
  • Very few or no concurrent transactions: No need for a complex transaction model
  • A single-purpose database: No need to spawn a system service, the database is stored in a single file and does not need to be accessed by multiple applications

The database will be accessed from multiple locations; we need to have a single entry point for it. Create a new C++ class named DatabaseManager and modify DatabaseManager.h to look like this:

#include <QString> 
class QSqlDatabase; 
const QString...