Book Image

Python GUI Programming Cookbook, Second Edition - Second Edition

By : Burkhard Meier
Book Image

Python GUI Programming Cookbook, Second Edition - Second Edition

By: Burkhard Meier

Overview of this book

Python is a multi-domain, interpreted programming language. It is a widely used general-purpose, high-level programming language. It is often used as a scripting language because of its forgiving syntax and compatibility with a wide variety of different eco-systems. Python GUI Programming Cookbook follows a task-based approach to help you create beautiful and very effective GUIs with the least amount of code necessary. This book will guide you through the very basics of creating a fully functional GUI in Python with only a few lines of code. Each and every recipe adds more widgets to the GUIs we are creating. While the cookbook recipes all stand on their own, there is a common theme running through all of them. As our GUIs keep expanding, using more and more widgets, we start to talk to networks, databases, and graphical libraries that greatly enhance our GUI’s functionality. This book is what you need to expand your knowledge on the subject of GUIs, and make sure you’re not missing out in the long run.
Table of Contents (18 chapters)
Title Page
About the Author
About the Reviewer
Customer Feedback

Using the SQL DELETE command

In this recipe, we will use the SQL DELETE command to delete the data we created in the previous recipe, Using the SQL UPDATE command.

While deleting data might at first sight sound trivial, once we get a rather large database design in production, things might not be that easy any more.

Because we have designed our GUI database by relating two tables via a primary to foreign key relation, when we delete certain data, we do not end up with orphan records because this database design takes care of cascading deletes.

Getting ready

This recipe uses the MySQL database, tables, as well as the data inserted into those tables from the previous recipe, Using the SQL UPDATE command. In order to demonstrate how to create orphan records, we will have to change the design of one of our database tables.

How to do it…

We kept our database design simple by using only two database tables.

While this works when we delete data, there is always a chance of ending up with orphan records...