With SAP R/3 system, SAP moved towards 3-tier architecture. A three-tier architecture is a client/server architecture, wherein we have three service layers Presentation layer, Application layer and Database layer. Each of these layers are developed and maintained as individual modules. SAP Installation consists of a database server, typically on a UNIX based machine/system; one or […]
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In ABAP Dictionary we can define following basic types. Data Element Structure Table Type We can use these data types to define data objects in ABAP programs. Data Elements use domains or predefined DDIC types to define their technical attributes. A structure consists of components that can be elementary fields or a structure or a
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ABAP Program is made up of various statements. Every ABAP statement starts with keyword. The ABAP statement could be categorized as Declarative Statements- begins with declarative keyword to declare user-defined type or data objects. TYPES, DATA, CONSTANTS, PARAMETERS, SELECT-OPTIONS, TABLES. Modularization statements defines processing block. Some keywords to define module are FORM.. ENDFORM, FUCNTION.. ENDFUNCTION,
An ABAP program follows the following structure. Header Global Declarations Processing Block Subroutine definitions Header Area It follows a standard template and includes information about the development and important comments. Global Declaration In the Global declaration section, we define types, and data objects which are global and can be accessed from anywhere in the program.
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Apart from declaring Data Objects using ABAP predefined elementary data types, we can also declare data objects using Local and Global data type. TYPES Keyword Using standard data types, we can define local data types in ABAP programs using TYPES statement. Scope of local types declared in ABAP programs is only limited to that program.
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In this chapter we will learn Elementary data types but before that let us understand Types and Objects. TYPES and OBJECTS Types are descriptions and are used to declare variables ( data objects ) in ABAP programs. Types do no occupy memory whereas data objects occupy their own memory space. ABAP standard Data types These
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