Book Image

Oracle Application Express 3.2 - The Essentials and More

By : Arie Geller, Matthew Lyon
Book Image

Oracle Application Express 3.2 - The Essentials and More

By: Arie Geller, Matthew Lyon

Overview of this book

Developing data-centric web applications can be a real challenge as it is a multi-disciplinary process. There are many technologies involved in the client side (HTML, CSS, JavaScript, and so on); the interaction with the database, on the server side; the typeless nature of the web environment; and above all, the need to put it all together. This needs to be done in a manner that will allow the end users to do their job in the simplest and most efficient way, while enriching their user experience. How often have you wished that developing such applications could be uncomplicated and straightforward? This book will show you that it's possible, and teaches you how to do it, using Oracle Application Express (APEX).With this practical guide to APEX, you'll learn how to easily develop data-centric web applications for the Oracle environment. The book covers the development cycle of an APEX application, reviewing the major APEX principles and building blocks chapter by chapter. It starts with the basic skills you need to get going when developing with APEX. Later, you will learn advanced issues, such as how to build tailor-made forms and reports, using APEX APIs, AJAX, and so on. It not only deals with the "How" but also with the "Why", and before long you will be able to understand APEX concepts, and use them to expand and enhance the built-in features, wizards, and tools.The book starts with the design phase, including building the necessary database objects infrastructure; continues with ways to implement the application logic (on the server side) and the User Interface (on the client side), whilst showing you how to enhance your applications' features and functionality according to your specific needs; and it ends with application deployment.The book emphasizes and clearly documents areas such as Globalization, Localization, and developing multi-lingual applications, and includes a special discussion about Right-To-Left (RTL) support for APEX applications, documented here for the first time.Throughout the book, there are many screenshots and snippets of code, taken from working APEX applications. The book is accompanied by demo APEX applications that you can download and install in your APEX environment, thoroughly analyze, and learn from as you read the book.
Table of Contents (30 chapters)
Oracle Application Express 3.2
Credits
About the Authors
About the Reviewers
Preface

Don't hardcode, use Substitution Strings


You should use Substitution Strings to store system parameters and other constants. It will give you higher degree of flexibility, portability, and more maintainable applications.

Using hardcoded parameters and constants is considered to be a bad development practice (even outside APEX), and it can cause problems, should they ever need to change. Finding all instances of the parameter in an application can be difficult and there is a risk that some instances may be overlooked. To avoid hardcoding and to make our applications more maintainable and portable, APEX provides us with some built-in Substitution Strings (some of them we reviewed in Chapter 3) and enables us to define our own twenty Substitution Strings. If twenty is not enough for you, I remind you that you can always use the Substitution String notation with application level items. As those are not limited in numbers, you should not have any problems implementing the policy of not using...