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"BC400 SAP ABAP 开发标准入门教程"

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The SAP ABAP Development BC400 course is a standard introductory tutorial designed to provide a comprehensive overview of the ABAP Workbench within the SAP NetWeaver platform. This course is intended for individuals looking to gain a foundational understanding of ABAP development and is conducted over a duration of 5 days. The material is copyrighted by SAP AG, and strict permission is required for any reproduction or transmission of the content. The course covers essential topics such as ABAP programming language, ABAP Dictionary, and ABAP Objects, providing participants with the knowledge and skills required to effectively utilize ABAP for development purposes. The training is facilitated by experienced instructors at SAP's Training Center, and participants can also access the education website for additional resources and reference materials. By the end of the course, participants will have a solid understanding of ABAP development and will be equipped to apply this knowledge in a practical work environment.

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Unit 1: Flow of an ABAP Program BC400

Figure 8: Input Values Are Inserted into Data Objects

As soon as the user has finished entering data on the selection screen, he or she

can trigger further processing of the program by choosing Execute.

The entered data is automatically placed in its corresponding data objects in the

program and the ABAP runtime system resumes control of processing.

In our simple program example there is only one ABAP processing block. The

ABAP runtime system triggers sequential processing of this ABAP processing

block.

If the entries made by the user do not have the correct type, an error message is

automatically triggered. The u ser must correct his/her entries.

BC400 Lesson: System Architecture and ABAP Program s

Figure 9: Reuse Unit Loading

A reusable unit is called in the processing block that enc apsulates the database

access. The reuse unit is a special processing block in an individual program. The

actual example shows a method in a global class. When the reuse unit is called,

the program in which it is contained is also read from the Repository and loaded to

the application server.

Figure 10: Reuse Unit Is C alled

Unit 1: Flow of an ABAP Program BC400

In the call, the required data is transferred to the called program, after which the

reuse unit is executed. The execution is synchronous, which means that the calling

program waits until the reuse unit has been processed completely.

Figure 11: Program Requests Data Record from the Database

In the example program, read access to the database is programmed in the reuse

unit. Correspondingly, information about the database table to be accessed and the

rowinthetabletobereadispassedontothedatabase.

BC400 Lesson: System Architecture and ABAP Program s

Figure 12: Database Supplies the Data Record

The dat abase returns the requested data record to the program and the runtime

system ensures that this data is placed in the appropriate data objects.

If a single record is accessed, this data object is usually a structure that contains

relevant components for all the required database fields.

Figure 13: Reuse Unit Returns the Data

Unit 1: Flow of an ABAP Program BC400

This concludes the processing of the reuse unit and control is returned to the calling

program, which resumes immediately after the call. When the system exits the

reuse unit, the data t hat was read from the database i s written to a corresponding

data object for the calling program, from where it can be processed further.

Figure 14: Runtime System Sends the List

After the reuse unit has been called, the ABAP processing block receives

statements for structuring the list with which the result is to be displayed. After

the processing block finishes, the runtime system sends the list as a screen to

the presentation server.

Topic Overview

The above-described example program already demonstrates numerous concepts

that make up the content of this course. The following table of contents, which

shows all topics dealt with and their corresponding units, serves as an orientation

aid for the remaining sections of this course.

Unit 1

Flow of an ABAP Program

Unit 2

Introduction to ABAP Workbench

Unit 3

Basic ABAP Language Elements

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