Saturday, March 17, 2012

SAP ABAP Introduction/ Introduction to ABAP



ABAP/4 stands for "Advanced Business Application Programming (4th Generation Language)". ABAP 4 is a programming language developed by SAP for the interactive development of application programming.The all modules in SAP are developed using the ABAP 4 language. ABAP 4 is a platform independent language. ABAP/4 is a fourth generation language. ABAP 4 is tightly integrated across all the modules viz like SD, MM, HR,FI,PP etc..


All application programs, along with parts of the R/3 Basis system, are written in the ABAP Workbench using ABAP, SAP’s programming language. The individual components of application programs are stored in a special section of the database called the R/3 Repository. The R/3 Repository serves as a central store for all of the development objects in the R/3 System. ABAP Programs are objects of R/3 Repository. You maintain them    using ABAP WorkBench Tool- in this case its ABAP Editor(Transaction SE38). 

SAP R/3 ARCHITECHTURE

SAP R/3 applications are written in the ABAP 4 programming language, and run within the application layer of the R/3 System.
ABAP programs communicate with the database management system of the central relational database (RDBMS), and with the graphical user interface (SAP GUI ) at presentation level.
Database Server: In this layer we have a single system which is responsible for only storing the data is called Database Server.

Application Server: In this we have 'N' no.of systems called as Application Servers, these Application Servers are responsible for executing the business applications.

Presentation Server: In this we have 'N' no.of systems called as Presentation Servers, these  Presentation  Servers are responsible for presenting the data/output data. Each user will be operating from presentation server.


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