abap describe的用法(程序示例)
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describe 用来输出变量(field structure table)的有关属性
主要有以下3种用法:
Field Properties
1. DESCRIBE FIELD ...
Properties of an Internal Table
2. DESCRIBE TABLE ...
Distance Between Two Fields
3. DESCRIBE DISTANCE ...
以下程序演示了相关用法:
REPORT demo_describe_field.
TYPES: surname(20) TYPE c,
street(30) TYPE c,
zip_code(10) TYPE n,
city(30) TYPE c,
phone(20) TYPE n,
date TYPE sy-datum.
TYPES: BEGIN OF address,
name TYPE surname,
code TYPE zip_code,
town TYPE city,
str TYPE street,
END OF address.
TYPES: BEGIN OF phone_list,
adr TYPE address,
tel TYPE phone,
END OF phone_list.
TABLES spfli.
DATA: BEGIN OF test,
col1(3) TYPE c,
col2(2) TYPE c,
col3 TYPE i,
END OF test,
dist TYPE i.
DATA: text(8) TYPE c VALUE 'abcdefgh', len TYPE i,
numtext(10) TYPE n VALUE '0123456789', typ(1) TYPE c,
pl TYPE phone_list,
n TYPE i,
float TYPE f, out TYPE i,
pack TYPE p DECIMALS 2, dec(1) TYPE c.
DESCRIBE FIELD text LENGTH len IN CHARACTER MODE.
WRITE: text, 'has length', len.
DESCRIBE FIELD numtext TYPE typ.
WRITE: / 'Numerical text has type', typ.
DESCRIBE FIELD spfli-fltime TYPE typ.
WRITE: 'and SPFLI-FLTIME has type', typ.
DESCRIBE FIELD float LENGTH len IN BYTE MODE OUTPUT-LENGTH out.
WRITE: / 'Floating point number has length', len,
'and output length', out.
DESCRIBE FIELD pack DECIMALS dec.
WRITE: / pack, 'has', dec, 'Decimals'.
DESCRIBE FIELD pl TYPE typ COMPONENTS n.
WRITE: / 'The complex field PL has type', typ, 'with', n, 'components'.
DESCRIBE DISTANCE BETWEEN test-col3 AND test-col1 INTO dist
IN BYTE MODE.
WRITE: / 'The distance between TEST-COL3 and TEST-COL1 is', dist.
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