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ABAP

Programming Models

Classical ABAP

Runtime Event-oriented Programming

Dialog Programming

Reporting1. Object Oriented Programming

R/3 Basis System

Logical components of R/3 Basis System are

Presentation Laer

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Application Laer

Database Laer

Processing Blocks

Event Blocks li!e LOAD-O"-PRO#RA$%&'&(&AL&)A(&O'% *(AR(-O"-*ELEC(&O'% #E(% E'D-O"-

*ELEC(&O'% A( *ELEC(&O' *CREE'% (OP-O"-PA#E% E'D-O"-PA#E% A( L&'E-*ELEC(&O'% A( +*ER CO$$A'D%

PROCE** BE"ORE O+(P+(% PROCE** A"(ER &'P+(

Dialog Modules , deined it/ $OD+LE - E'D$OD+LECalled during PBO and PA& events rom screen lo logic o

t/e ABAP program0s screen

lasses , deined it/ CLA** - E'DCLA**

Procedures , t/ere are t/ree tpes o procedures.

Su!routines , deined it/ "OR$ - E'D"OR$.Called it/ PER"OR$

"unctions , deined it/ "+'C(&O' -E'D"+'C(&O'

Called it/ CALL "+'C(&O'

Met#ods , deined it/ $E(OD - E'D$E(ODCalled it/ CALL $E(OD

Program $ypes

(/ere are to tpes

1. E%ecuta!les 2(pe 13+sed or reporting purpose.

Program is deined as REP&R$ 'name(

4. Module Pools 2(pe $3+sed or Dialog Programming.

Program is deined as PR&)RAM(ransaction Code is assigned or eac/ program.

Program Modulari*ation

(/ree tpes o modulari5ation

+, -nternal& ou ant to reuse se6uences o code and to encapsulate

unctions and data it/in our ABAP program% ou canmodulari5e our program eit/er it/ local subroutines or

methods of local classes.

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., E%ternal& ou ant to create procedures t/at are accessible not just

inside one program% but or all ABAP programs o t/e R78sstem% ou can create function modules (Type F) or

methods in global classes (Type K).

3, Source ode

(/ere is anot/er !ind o modulari5ation t/at ou s/ould neverconuse it/ real program $odulari5ation. (/is is source code

modulari5ation it/ Include programs (Type I). &nclude

programs are not separatel compiled units. (/eir source codeis inserted into t/e programs in /ic/ a corresponding &'CL+DE

statement occurs. &nclude programs allo ou to managecomple9 programs in an orderl a.

$o all ABAP ProgramE9ecutables -: SBM-$

$odule Pools -: ALL $RA0SA$-&0

ABAP $1PE 0-2ERSE

(/ere are mainl to tpes in ABAP (pe +niverse

1. Data $ypes deined it/ $1PE !eord.(/ere are t/ree categories o Data (pes

+,+, Elementary

Elementar (pe is

1.1.1. "i9ed Lengt/&n "i9ed Lengt/ olloing are sub tpe0umeric

"loating 2"3

&nteger 2&3Pac!ed 2P3

#aracter

C/aracter 2C3

'umeric (e9t 2'3

Date 2D3(ime 2(3e9adecimal 2;3

1.1.4. <ariable Lengt/

(/ere are to tpes in t/is categorC/aracter 2*(R&'#3

Bte *tring 2;*(R&'#3+,., omple%

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Comple9 (pe is1.4.1. *tructure

1.4.4. (able+,3, Reference

Reerence (pe is

1.8.1. Data1.8.4. Object

4. &!4ect $ypes deined it/ DA$A !eord.(o categories under t/is are

.,+, lasses 5 &!4ects

.,., -nterface

Screens

*creen is programmed it/ t/e Screen Painter (ool o ABAP

6ork!enc#.

(/ere are to tpes

+, )eneral Screens

&t consist o to tpes

"irst Layout t/at deines t/e ront-end appearance o t/e

indo t/at is presented to t/e user.

*econd "lo7 Logic t/at is e9ecuted on t/e bac!end b t/eapplication server.

(/e screen lo logic is a program laer beteen t/e ront-endand t/e actual ABAP application program at t/e bac!end.

., Special Screens

(o tpes4.1. *election *creens

Selection screens are special screens used to enter values

in ABAP programs. =ou can deine selection screens in t/eglobal declaration part o an ABAP

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program t/at can contain screens using t/e olloingspecial declaration statements, *ELEC(&O'*CREE' deines

and ormats selection screens% andPARA$E(ER* and *ELEC(-OP(&O'* deine input ields or

single values or intervals.

4.4. Lists

Lists are output-oriented screens t/at displa ormatted%structured data. Data in list ormat can be sent to t/e R78

spool sstem or printing. =ou deine

lists using a special set o statements 2>R&(E% *?&P%+L&'E% and so on3. >it/ t/ese statements% a list is created

and buered on t/e application server.

(o call screen call using $ransaction ode or b using t/e ALL

SREE0.

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