CONSTANTS
Short Reference
ABAP Syntax CONSTANTS const [ options ].
What does it do? This statement declares a constant data object,
const
for short. The content of a constant cannot be changed at runtime of
an ABAP program. It can only be used as an operand in
reader positions of ABAP statements.
Constants declared in the declaration section of a class or an interface
belong to static attributes of that
class or interface.
The naming conventions apply to the
name const . The syntax of the additions options of the
statement CONSTANTS statement for declaring constants matches the
statement DATA for declaring variables. Only
the additions READ-ONLY ,
BOXED , and the declaration of
LOB handle structures are not
possible. As previously, the statement INCLUDE cannot be used
within the declaration of a structure.
Unlike the DATA statement, an
initial value with the addition VALUE
must be specified when using the CONSTANTS statement. The same
restrictions as for the DATA statement apply. This has the
following implications for the declaration of constants with
deep data types:
A start value val can be specified for the ABAP types
string and xstring only.
Constant internal tables, reference variables, and structures with not
purely character-like flat components can be assigned their
initial value by IS INITIAL
only, and are therefore always initial.
Latest notes: If the class component selector is used, the interface
name can also be used to access static attributes of interfaces declared
using CONSTANTS .
Constants are stored in the PXA and are
available to all programs.
Example ABAP Coding The statements below declare a numeric constant, a
constant structure, and a constant reference. The reference can be used
in comparisons, for example, or passed to
procedures .
CONSTANTS pi TYPE p LENGTH 8 DECIMALS 14
VALUE '3.14159265358979'.
CONSTANTS: BEGIN OF sap_ag,
zip_code TYPE n LENGTH 5 VALUE '69189',
city TYPE string VALUE `Walldorf`,
country TYPE string VALUE `Germany`,
END OF sap_ag.
CONSTANTS null_pointer TYPE REF TO object VALUE IS INITIAL.
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