chapter 02_online programming example

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2005 IBM CorporationOnline Programming Example | 6.02 March-2005

Online Programming Example


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2005 IBM Corporation2 March-2005Online Programming Example | 6.02

Objectives

The participants will be able to:

Create an online program

Use the object navigator

Maintain the

Screen attributes

Screen layout

Field attributes

Flow logic

ABAP modules

Global data

Recognize screen to program data transport

Execute an online program


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Overview

In this chapter, we will create a simple online program. This program willcalculate a players scoring average.


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Creating an Online Program

Online program name

must begin with SAPM

and then either a Y or

Z.

Go back to Repository

Browser, not source

code.

With TOP INCL.

should be checked.

Title

Type MODULE

Application


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Object Navigator

Main Program

** SAPMY220_PLAYER_AVG **

INCLUDE MY220_PLAYER_AVGTOP.

Top Include

** MY220_PLAYER_AVGTOP - Include Program **

PROGRAM SAPMY220_PLAYER_AVG.


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Enter a screen number

and click on the

Create(F5)

pushbutton.

In the online programs hierarchy list in the Object Navigator, double-click on theprogram name and then single click on the icon other objects(shift+F5)

application toolbar to create program components.

Online Program Components


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Screen Attributes

Screen Attributes

Screen Painter

Short Description Screen Type Next Screen

Required Required Optional

For each screen you create, you must maintain the Screen Attributes in theScreen Painter. There are two required fields in the Screen Attributes section.


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Screen Layout

Fullscreen Editor

Player_Average

Total_Points ______

Total_Games ______Input/output

templates are

created with

underscores.

Use an

underscore to

link words into

one text field.

Screen Painter

Text fields are

created with

character

strings.


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Field Attributes

Element List

Field name,

not text FieldformatInput and output

turned on

Screen Painter


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Flow Logic

Screen Painter

PROCESSBEFORE OUTPUT.

MODULE INITIALIZE.

PROCESS AFTER INPUT.

MODULE CALCULATE.

Flow

Logic

Command

ABAP module to clear

all fields before

screen is displayed.

ABAP module to

calculate average

after user has entered

values and clicked

Enter.

Screen 9000

Flow Logic

The Flow Logic refers to the code behind the screens and it is maintained in theScreen Painter. Each screen has its own Flow Logic which is divided into two

main events PBO AND PAI.


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** SAPMYOP_PLAYER_AVG **

INCLUDE MYOP_PLAYER_AVGTOP.

INCLUDE MYOP_PLAYER_AVGO01.

INCLUDE MYOP_PLAYER_AVGI01.

ABAP Modules

Main Program PBO Module

** MYOP_PLAYER_AVGO01 - Include

Program **

MODULE INITIALIZE OUTPUT.

CLEAR: POINTS, GAMES, AVERAGE

ENDMODULE.

PAI Module

** MYOP_PLAYER_AVGI01 - Include Program **MODULE CALCULATE INPUT.

CHECK GAMES 0.

AVERAGE = POINTS / GAMES.

ENDMODULE.

The fields POINTS, GAMES,and AVERAGE need to be

defined as global data.


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Global Data

Top Include

** MYOP_PLAYER_AVGTOP - Include Program **

PROGRAM SAPMYOP_PLAYER_AVG.DATA: POINTS TYPE I,

GAMES TYPE I,

AVERAGE TYPE P

DECIMALS2.

Main Program

** SAPMYOP_PLAYER_AVG **

INCLUDE MYOP_PLAYER_AVGTOP.

INCLUDE MYOP_PLAYER_AVGO01.

INCLUDE MYOP_PLAYER_AVGI01.

It is important that these program

fields are named the same as the

screen fields so automatic data

transport will occur between the

screen work area and program

work area.


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Screen to Program Data Transport

When the PAI event is triggered, values are

transported from the screen work area to

the program fields with the same names

beforeany PAI modules are executed.


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Transaction Code

Transaction Text Program Name Initial Screen

Required Required Required

Executing an Online Program

To execute an online program, you must create a transaction code. You cannotuse the F8 key or Program > Execute menu path to execute an online program.

SAPMY220_PLAYER_AVG 9000


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Demonstration

Creation of an online program to display a players scoring average. Two screens are required to be created for this program .

The first screen takes the total points and the number of games as input.

The scoring average is output in the next screen.


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Practice

Creation of an online program to display a players scoring average. Two screens are required to be created for this program .

The first screen takes the total points and the number of games as input.

The scoring average is output in the next screen.


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Summary

When you create an online program, its name must begin with SAPM and theneither a Y or Z. The last characters in the program SAPMzaaa... can be

letters or numbers.

The program type is M for module pool. This type M will automatically be

defaulted for you if your program name begins with SAPM.

In the Object Navigator, you can double-click on the online program name to seethe programs hierarchy of sub-objects (components). From this hierarchy list, you

can create all the components of the online program by double-clicking on the

Program object types branch (see next slide).

For each screen you create, you must maintain the Screen Attributes in the

Screen Painter.

You maintain the physical layout of a screen in the Fullscreen Editor of the

Screen Painter.

Use the Element List tab for the screen to name the screen fields.


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Summary (Contd.)

The Flow Logic refers to the code behind the screens and it is maintained in theScreen Painter.

The PBO and PAI modules contain the main processing logic of the online

program and are called from within the Flow Logic of the screens with the

MODULE command.

The global data for an online program is declared in the Top Include program. When the PAI event is triggered, values are transported from the screen work

area to the program fields with the same names before any PAI modules are

executed.

To execute an online program, you must create a transaction code. You cannot

use the F8 key or Program -> Execute menu path to execute an online

program.


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Questions

PROCESS BEFORE OUTPUT.

MODULE CALCULATE.


Screen 9001

PROCESS BEFORE OUTPUT.

MODULE INITIALISE.


MODULE CALCULATE.

Screen 9000

We could have calculated the players average in the PBO of screen 9001.Why is it better to do the calculation in the PAI of screen 9000 instead of the

PBO of screen 9001?

chapter 02_online programming example

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