一些我工作中經常使用的ABAP新語法和函式，關鍵字，可以提高工作效率

(1) 直接批次生成資料到ABAP內表裡：

* 2017-05-14 7:17PM in Xun's house, Wiesloch

INSERT demo_join1 FROM TABLE @( VALUE #(

( a = 'a1' b = 'b1' c = 'c1' d = 'uu' )

( a = 'a2' b = 'b2' c = 'c2' d = 'uu' )

( a = 'a3' b = 'b3' c = 'c3' d = 'vv' )

( a = 'a4' b = 'b4' c = 'c4' d = 'ww' ) ) ).

(2) 採用內聯方式遍歷ABAP內表：

DATA address_annos TYPE STANDARD TABLE OF field_anno-annoname

WITH EMPTY KEY.

address_annos = VALUE #(

( 'SEMANTICS.NAME.FULLNAME' )

( 'SEMANTICS.ADDRESS.STREET' )

( 'SEMANTICS.ADDRESS.CITY' )

( 'SEMANTICS.ADDRESS.ZIPCODE' )

( 'SEMANTICS.ADDRESS.COUNTRY' ) ).

DATA address_components TYPE STANDARD TABLE OF field_anno-fieldname

WITH EMPTY KEY.

address_components = VALUE #(

FOR address_anno IN address_annos

( VALUE #( fieldannos[ annoname = address_anno ]-fieldname

DEFAULT '---' ) ) ).

(3) 兩個內表間資料的複製，兩個內表的列結構可以不同，開發人員需要額外傳入一個對映表，告訴corresponding關鍵字，源內表的哪一列應該賦到目標內表的哪一列。

* This is exactly what I want!!

REPORT demo_corresponding_vs_for.

CLASS demo DEFINITION.

PUBLIC SECTION.

CLASS-METHODS:

main,

class_constructor.

PRIVATE SECTION.

TYPES:

BEGIN OF struct,

carrier TYPE spfli-carrid,

connection TYPE spfli-connid,

departure TYPE spfli-cityfrom,

destination TYPE spfli-cityto,

END OF struct.

CLASS-DATA:

itab TYPE HASHED TABLE OF spfli

WITH UNIQUE KEY carrid connid,

result1 TYPE HASHED TABLE OF struct

WITH UNIQUE KEY carrier connection,

result2 TYPE HASHED TABLE OF struct

WITH UNIQUE KEY carrier connection,

result3 TYPE HASHED TABLE OF struct

WITH UNIQUE KEY carrier connection,

in TYPE REF TO if_demo_input,

out TYPE REF TO if_demo_output.

ENDCLASS.

CLASS demo IMPLEMENTATION.

METHOD main.

DATA(iterations) = 10.

in->request( CHANGING field = iterations ).

DO iterations TIMES.

DATA t1 TYPE i.

GET RUN TIME FIELD DATA(t11).

result1 = CORRESPONDING #(

itab MAPPING carrier = carrid

connection = connid

departure = cityfrom

destination = cityto ).

GET RUN TIME FIELD DATA(t12).

t1 = t1 + t12 - t11.

DATA t2 TYPE i.

GET RUN TIME FIELD DATA(t21).

result2 = VALUE #( FOR wa IN itab ( carrier = wa-carrid

connection = wa-connid

departure = wa-cityfrom

destination = wa-cityto ) ).

GET RUN TIME FIELD DATA(t22).

t2 = t2 + t22 - t21.

DATA t3 TYPE i.

GET RUN TIME FIELD DATA(t31).

result3 = VALUE #( FOR wa IN itab (

CORRESPONDING #(

wa MAPPING carrier = carrid

connection = connid

departure = cityfrom

destination = cityto ) ) ).

GET RUN TIME FIELD DATA(t32).

t3 = t3 + t32 - t31.

ENDDO.

IF result1 = result2 AND result1 = result3.

out->write(

|CORRESPONDING: {

CONV decfloat16( t1 / iterations )

WIDTH = 10 ALIGN = RIGHT } Microseconds\n| &&

|FOR: {

CONV decfloat16( t2 / iterations )

WIDTH = 10 ALIGN = RIGHT } Microseconds\n| &&

|FOR CORRESPONDING: {

CONV decfloat16( t3 / iterations )

WIDTH = 10 ALIGN = RIGHT } Microseconds\n|

)->line(

)->display( result1 ).

ELSE.

out->display( `What?` ).

ENDIF.

ENDMETHOD.

METHOD class_constructor.

in = cl_demo_input=>new( ).

out = cl_demo_output=>new( ).

SELECT *

FROM spfli

INTO TABLE @itab.

ENDMETHOD.

ENDCLASS.

START-OF-SELECTION.

demo=>main( ).

(4) DISCARDING DUPLICATES的用法

REPORT demo_corresponding_duplicates.

CLASS demo DEFINITION.

PUBLIC SECTION.

CLASS-METHODS main.

ENDCLASS.

CLASS demo IMPLEMENTATION.

METHOD main.

TYPES:

BEGIN OF line,

a1 TYPE i,

a2 TYPE i,

END OF line,

ntab1 TYPE STANDARD TABLE OF line WITH EMPTY KEY,

ntab2 TYPE SORTED TABLE OF line WITH UNIQUE KEY a1,

BEGIN OF line1,

x1 TYPE i,

x2 TYPE ntab1,

END OF line1,

BEGIN OF line2,

y1 TYPE i,

y2 TYPE ntab2,

END OF line2,

itab1 TYPE STANDARD TABLE OF line1 WITH EMPTY KEY,

itab2 TYPE SORTED TABLE OF line2 WITH UNIQUE KEY y1.

DATA(itab1) =

VALUE itab1( ( x1 = 1 x2 = VALUE #( ( a1 = 1 a2 = 2 )

( a1 = 3 a2 = 4 ) ) )

( x1 = 2 x2 = VALUE #( ( a1 = 1 a2 = 2 )

( a1 = 1 a2 = 4 ) ) )

( x1 = 1 x2 = VALUE #( ( a1 = 1 a2 = 2 )

( a1 = 3 a2 = 4 ) ) ) ).

DATA(itab2) =

CORRESPONDING itab2( itab1 DISCARDING DUPLICATES

MAPPING y1 = x1

y2 = x2 DISCARDING DUPLICATES ).

DATA(out) = cl_demo_output=>new( ).

LOOP AT itab2 INTO DATA(wa).

out->write( wa-y1

)->write( wa-y2

)->line( ).

ENDLOOP.

out->display( ).

ENDMETHOD.

ENDCLASS.

START-OF-SELECTION.

demo=>main( ).

(5) DESCRIBE DISTANCE BETWEEN

REPORT demo_describe_distance.

CLASS demo DEFINITION.

PUBLIC SECTION.

CLASS-METHODS main.

ENDCLASS.

CLASS demo IMPLEMENTATION.

METHOD main.

DATA: BEGIN OF struc,

comp1 TYPE i,

comp2 TYPE x LENGTH 1,

comp3 TYPE c LENGTH 4 VALUE 'Hey',

comp4 TYPE c LENGTH 4 VALUE 'you!',

comp5 TYPE x,

END OF struc.

FIELD-SYMBOLS: <hex> TYPE x,

<result> TYPE c.

DESCRIBE DISTANCE BETWEEN:

struc AND struc-comp3 INTO DATA(off) IN BYTE MODE,

struc-comp3 AND struc-comp5 INTO DATA(len) IN BYTE MODE.

ASSIGN: struc TO <hex> CASTING,

<hex>+off(len) TO <result> CASTING.

cl_demo_output=>display(

|Offset off is { off }.\n| &&

|Length len is { len }.\n| &&

|<result> points to "{ <result> }".| ).

ENDMETHOD.

ENDCLASS.

START-OF-SELECTION.

demo=>main( ).

(6) 全動態方式呼叫RFC

REPORT demo_rfc_dynamic_dest.

CLASS demo DEFINITION.

PUBLIC SECTION.

CLASS-METHODS:

main.

ENDCLASS.

CLASS demo IMPLEMENTATION.

METHOD main.

DATA:

val_in TYPE string VALUE `val_in`,

val_in_out TYPE string VALUE `val_in_out`,

val_out TYPE string,

msg TYPE c LENGTH 80.

IF sy-uname IS INITIAL.

cl_demo_output=>display(

|Example not possible for anonymous user| ).

RETURN.

ENDIF.

DATA(in) = cl_demo_input=>new( ).

DATA(client) = sy-mandt.

in->add_field( CHANGING field = client ).

DATA(uname) = sy-uname.

in->add_field( CHANGING field = uname ).

DATA(langu) = sy-langu.

in->add_field( CHANGING field = langu ).

DATA(sysid) = sy-sysid.

in->add_field( CHANGING field = sysid ).

DATA(host) = CONV rfchost( sy-host ).

in->add_field( CHANGING field = host ).

DATA(group) = CONV rfcload( 'PUBLIC' ).

in->add_field( CHANGING field = group ).

in->request( ).

DATA(dest) = cl_dynamic_destination=>create_rfc_destination(

logon_client = client

logon_user = uname

logon_language = langu

sid = sysid

server = host

group = group ).

CALL FUNCTION 'DEMO_RFM_PARAMETERS'

DESTINATION dest

EXPORTING

p_in = val_in

IMPORTING

p_out = val_out

CHANGING

p_in_out = val_in_out

EXCEPTIONS

system_failure = 2 MESSAGE msg

communication_failure = 4 MESSAGE msg.

IF sy-subrc <> 0.

cl_demo_output=>display( |Error when calling sRFC.\n{ msg }| ).

RETURN.

ENDIF.

cl_demo_output=>display( |{ val_out }\n{ val_in_out }| ).

ENDMETHOD.

ENDCLASS.

START-OF-SELECTION.

demo=>main( ).

(7) 行內函數line_index

REPORT.

CLASS demo DEFINITION.

PUBLIC SECTION.

CLASS-METHODS: class_constructor,

main.

PRIVATE SECTION.

CLASS-DATA

flight_tab

TYPE STANDARD TABLE OF spfli

WITH EMPTY KEY

WITH UNIQUE HASHED KEY id COMPONENTS carrid connid

WITH NON-UNIQUE SORTED KEY cities COMPONENTS cityfrom cityto.

ENDCLASS.

CLASS demo IMPLEMENTATION.

METHOD main.

DATA idx TYPE TABLE OF i.

idx = VALUE #(

( line_index( flight_tab[ carrid = 'UA'

connid = '0941'

##primkey[id] ] ) )

( line_index( flight_tab[ KEY id

carrid = 'UA'

connid = '0941' ] ) )

( line_index( flight_tab[ KEY id

carrid = 'xx'

connid = 'yyyy' ] ) )

( line_index( flight_tab[ cityfrom = 'FRANKFURT'

cityto = 'NEW YORK'

##primkey[cities] ] ) )

( line_index( flight_tab[ KEY cities

cityfrom = 'FRANKFURT'

cityto = 'NEW YORK' ] ) )

( line_index( flight_tab[ KEY cities

cityfrom = 'xxxxxxxx'

cityto = 'yyyyyyyy' ] ) ) ).

cl_demo_output=>display( idx ).

ENDMETHOD.

METHOD class_constructor.

SELECT *

FROM spfli

ORDER BY carrid, connid

INTO TABLE @flight_tab.

ENDMETHOD.

ENDCLASS.

START-OF-SELECTION.

demo=>main( ).