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Python GUI Programming Cookbook, Second Edition

You're reading from   Python GUI Programming Cookbook, Second Edition Use recipes to develop responsive and powerful GUIs using Tkinter

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Product type Paperback
Published in May 2017
Publisher Packt
ISBN-13 9781787129450
Length 444 pages
Edition 2nd Edition
Languages
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Author (1):
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Burkhard Meier Burkhard Meier
Author Profile Icon Burkhard Meier
Burkhard Meier
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Toc

Table of Contents (12) Chapters Close

Preface 1. Creating the GUI Form and Adding Widgets FREE CHAPTER 2. Layout Management 3. Look and Feel Customization 4. Data and Classes 5. Matplotlib Charts 6. Threads and Networking 7. Storing Data in our MySQL Database via our GUI 8. Internationalization and Testing 9. Extending Our GUI with the wxPython Library 10. Creating Amazing 3D GUIs with PyOpenGL and PyGLet 11. Best Practices

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...

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