Book Image

Mastering SAP ABAP

By : Paweł Grześkowiak, Philipp Deth, Wojciech Ciesielski, Wojciech Ćwik
Book Image

Mastering SAP ABAP

By: Paweł Grześkowiak, Philipp Deth, Wojciech Ciesielski, Wojciech Ćwik

Overview of this book

Advanced Business Application Programming (ABAP) is an established and complex programming language in the IT industry. This book is designed to help you use the latest ABAP techniques and apply legacy constructions using practical examples. You'll start with a quick refresher on language and database concepts, followed by agile techniques for adding custom code to a modern ABAP system. After this, you will get up to speed with the complete ABAP toolset for importing data to and from different environments. Next, you'll learn how to print forms and work with the different ABAP tools for Extensible Markup Language (XML) manipulation. While covering further chapters, you'll gain insights into building stunning UI5 interfaces, in addition to learning how to develop simple apps using the Business Object Processing Framework (BOPF). You will also pick up the technique of handling exceptions and performing testing in ABAP. In the concluding chapters, you can look forward to grasping various techniques for optimizing the performance of programs using a variety of performance analysis tools. By the end of this book, you will have the expertise you need to confidently build maintainable programs in Systems, Applications, and Products (SAP).
Table of Contents (19 chapters)

Class-based exceptions


As the object-oriented programming philosophy was incorporated into ABAP programming, the exceptions concept had to evolve as well. As programs grew and used more classes and objects, the exceptions were eventually migrated to class-based programming. There was also a more practical reason for this move-defining exception, since an object allows for passing more detailed information on what happened to the caller, thereby letting the developer define better-tailored reactions.

The newly created exception objects—either standard or custom ones—are children of the same master abstract class, CX_ROOT, and therefore all have common attributes: TEXTID, PREVIOUS, and IS_RESUMABLE, and the common methods, GET_TEXT, GET_LONGTEXT, and GET_SOURCE_POSITION.

The CX_ROOT class is the most general exception class and, as such, contains very little information about the specific causes of the exception. Thus, there is a whole hierarchy of subclasses grouped into three elements that...