SAP ABAP Syntax for Describe part one

DESCRIBE - determine distance between two fields

Basic form

DESCRIBE DISTANCE BETWEEN f1 AND f2 INTO f3.

Effect

Determines the distance between the fields f1 and f2 and places the result (in bytes) in f3 .

Example

Determine the distance between two components of the demo table SBOOK in the flight reservation system:

 TABLES SBOOK.

DATA DIST TYPE I.

DESCRIBE DISTANCE BETWEEN SBOOK-CARRID

                  AND     SBOOK-BOOKID

                  INTO    DIST.

Result: DIST contains the value 15 because exactly two fields, SFLIGHT-CONNID (4 bytes) and SBOOK-FLDATE (8 bytes), lie between the SBOOK components CARRID and BOOKID ; also, SBOOK-CARRID is itself 3 bytes long. The sum of these values gives the distance between the two components in bytes.

DESCRIBE - Supply attributes of a field

Basic form

DESCRIBE FIELD f.

Effect

Supplies the attributes of the field f . You must specify at least one of the additions:

Additions

1. ... LENGTH len
2. ... TYPE typ
3. ... TYPE typ COMPONENTS n
4. ... OUTPUT-LENGTH len
5. ... DECIMALS n
6. ... EDIT MASK mask

Addition 1

... LENGTH len

Effect

Returns the length of the field f in the field
len .

Example

DATA: FLD(8),

      LEN TYPE P.

DESCRIBE FIELD FLD LENGTH LEN.

 Result: LEN contains the value 8.

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