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Enterprise Programming
ABAP DICTIONARY BASICS
AND DATABASE INTERACTION
ABAP Dictionary
The ABAP Dictionary (SE11) allows Centralized type definition and management Creation of user-defined data elements, structures, and table types Definition of tables, indexes, and views Definition of services that support program development Table locking and lock releasing Defining input help (F4) Defining field help (F1)
Changes within the ABAP Dictionary are immediately in effect for those programs which use that dictionary elements.
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Data Definition
Data Types Three types can be defined:
Data Element Structure Table Types (internal tables)
The Type Group option provided by the Dictionary that is primarily there to support older development. (Type Groups were available before Data Types were supported.) Type Groups now are primarily used to define non-object-oriented constants.
Domain data is available to support the definition of data types, but domain data is not accessible in an ABAP Program. There are 24 data specifications in the domain that are used in Data Dictionary Data Types.
Data Element
Data Objects and the Data Dictionary
Domain
Database Table
Fields
Structure
Components
Internal Table
Line structure
ABAP Program
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SAP WAS Architecture
Presentation Layer
Database Layer
Application Layer ABAP Dispatcher
Work Process
Work Process
Work Buffer Process
DB Work Process Buffer
DB Disks
DB Disks
Open SQL
Open SQL statements in ABAP program converted to database- specific SQL by the database interface. It is possible to access database with Native SQL, but the code is then database specific and less transportable.
Many Open SQL statements mirror those of "traditional" SQL, but with subtle differences and refinements.
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