Book Image

Pyside GUI Application Development- Second Edition - Second Edition

By : Venkateshwaran Loganathan, Gopinath Jaganmohan
Book Image

Pyside GUI Application Development- Second Edition - Second Edition

By: Venkateshwaran Loganathan, Gopinath Jaganmohan

Overview of this book

Elegantly-built GUI applications are always a massive hit among users. PySide is an open source software project that provides Python bindings for the Qt cross-platform UI framework. Combining the power of Qt and Python, PySide provides easy access to the Qt framework for Python developers and also acts as an excellent rapid application development platform. This book will take you through everything you need to know to develop UI applications. You will learn about installing and building PySide in various major operating systems as well as the basics of GUI programming. The book will then move on to discuss event management, signals and slots, and the widgets and dialogs available with PySide. Database interaction and manipulation is also covered. By the end of this book, you will be able to program GUI applications efficiently and master how to develop your own applications and how to run them across platforms.
Table of Contents (13 chapters)

Executing SQL queries

After successful connection to the database, we can execute SQL queries to perform some actions on it. If we don't specify a connection name, the default connection is taken. The PySide.QtSql.QSqlQuery class provides a means of executing and manipulating SQL databases.

Executing a query

The SQL query can be executed by creating a QSqlQuery object and calling an exec_() function on this. As an example, we create a table named employee and define its columns, as follows:

myQuery = QSqlQuery()

myQuery.exec_("""CREATE TABLE employee (id INTEGER PRIMARY KEY  AUTOINCREMENT UNIQUE NOT NULL, first_name CHAR(20) NOT NULL, last_name CHAR(20), age INT, sex CHAR(1), income FLOAT)""")

This will create a table with six columns, namely id, first_name, last_name, age, sex, and income. The QSqlQuery constructor accepts an optional parameter, a QSqlDatabase object that specifies which database connection to use. As we don't specify any connection name in the preceding code, the default...