ABAP Select data from SAP table KOMLFKO into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP KOMLFKO table and store it within an internal table, including using the newer @DATA inline declaration methods. It also shows you various ways to process this data using ABAP work area, inline declaration or field symbols including executing all the relevant CONVERSION_EXIT routines specific to KOMLFKO. See here for more generic Select statement tips.

Sometimes data within SAP is stored within the database table in a different format to what it is displayed to the user. These input/output conversation FM routines are what translates the data between the two formats.

There is also a full declaration of the KOMLFKO table where each field has a char/string type for you to simply copy and paste. This allows you to use processing that is only available to these field types such as the CONCATENATE statement.

DATA: IT_KOMLFKO TYPE STANDARD TABLE OF KOMLFKO,
      WA_KOMLFKO TYPE KOMLFKO,
      GD_STR TYPE STRING.

DATA: lo_typedescr type REF TO cl_abap_typedescr.
DATA: lv_fieldname type fieldname.

FIELD-SYMBOLS: <FIELD> TYPE any.
FIELD-SYMBOLS: <KOMLFKO> TYPE KOMLFKO.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_KOMLFKO.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM KOMLFKO
  INTO TABLE IT_KOMLFKO.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM KOMLFKO
*  INTO TABLE @DATA(IT_KOMLFKO2).
*--Further methods of using ABAP code to  select data from SAP database tables

*You can also declare the header/work area using the in-line DATA declaration method
READ TABLE IT_KOMLFKO INDEX 1 INTO DATA(WA_KOMLFKO2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_KOMLFKO ASSIGNING <KOMLFKO>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<KOMLFKO>-OLDNR = 1.
<KOMLFKO>-OLDPO = 1.
<KOMLFKO>-WBELN = 1.
<KOMLFKO>-KPOSN = 1.
<KOMLFKO>-KSCHL = 1.

ENDLOOP.

LOOP AT IT_KOMLFKO INTO WA_KOMLFKO.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_KOMLFKO-KBETR, sy-vline,
  WA_KOMLFKO-KAWRT, sy-vline,
  WA_KOMLFKO-KWERT, sy-vline,
  WA_KOMLFKO-KSTBS, sy-vline,
  WA_KOMLFKO-KWAEH, sy-vline,
  WA_KOMLFKO-KPEIN, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_KOMLFKO you want to display...

  WRITE:/ sy-uline.
* Aternatively use generic code to Write field values (and NAME) to screen report
  DO.
    ASSIGN COMPONENT sy-index OF STRUCTURE wa_KOMLFKO TO <field>.
    IF sy-subrc <> 0. EXIT. ENDIF.
    WRITE:/ 'Field Value', <field>, sy-vline.
    gd_str = <field> .
    lo_typedescr ?= CL_ABAP_DATADESCR=>DESCRIBE_BY_DATA( <field> ).
    lv_fieldname = lo_typedescr->GET_RELATIVE_NAME( ).
    WRITE:/ 'Field Name', lv_fieldname.
  ENDDO.

  
*Redo loop but convert all fields from internal to out value  
LOOP AT IT_KOMLFKO INTO WA_KOMLFKO.


*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Convert all fields to display/output versions using conversion routines
  PERFORM convert_all_field_values CHANGING wa_EKKO.
	 
ENDLOOP.

  
*&---------------------------------------------------------------------*
*& Form convert_all_field_values
*&---------------------------------------------------------------------*
FORM convert_all_field_values CHANGING p_EKKO LIKE wa_EKKO.
DATA: ld_input(1000) TYPE c, ld_output(1000) TYPE C.

*Conversion exit ALPHA, internal->external for field WBELN
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_KOMLFKO-WBELN
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_KOMLFKO-WBELN.
WRITE:/ 'New Value:', ld_input.

*Conversion exit CUNIT, internal->external for field KMEIN
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_KOMLFKO-KMEIN
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_KOMLFKO-KMEIN.
WRITE:/ 'New Value:', ld_input.

*Conversion exit CUNIT, internal->external for field KONMS
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_KOMLFKO-KONMS
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_KOMLFKO-KONMS.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field SAKN1
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_KOMLFKO-SAKN1
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_KOMLFKO-SAKN1.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field SAKN2
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_KOMLFKO-SAKN2
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_KOMLFKO-SAKN2.
WRITE:/ 'New Value:', ld_input.

*Conversion exit EXCRT, internal->external for field KKURS
CALL FUNCTION 'CONVERSION_EXIT_EXCRT_OUTPUT'
  EXPORTING
    input =                      WA_KOMLFKO-KKURS
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_KOMLFKO-KKURS.
WRITE:/ 'New Value:', ld_input.
ENDFORM. 

*&---------------------------------------------------------------------*
*& Form process_as_string_field_values
*&---------------------------------------------------------------------*
FORM process_as_string_field_values CHANGING p_EKKO LIKE wa_EKKO.

TYPES: BEGIN OF T_KOMLFKO_STR, 
OLDNR TYPE STRING,
OLDPO TYPE STRING,
WBELN TYPE STRING,
KPOSN TYPE STRING,
KSCHL TYPE STRING,
KBETR TYPE STRING,
KAWRT TYPE STRING,
KWERT TYPE STRING,
KSTBS TYPE STRING,
KWAEH TYPE STRING,
KPEIN TYPE STRING,
KMEIN TYPE STRING,
KNUMH TYPE STRING,
KRECH TYPE STRING,
KRUEK TYPE STRING,
KINAK TYPE STRING,
KNTYP TYPE STRING,
KDATU TYPE STRING,
KRELI TYPE STRING,
KOLNR TYPE STRING,
KSTEU TYPE STRING,
KHERK TYPE STRING,
KSTAT TYPE STRING,
KAPPL TYPE STRING,
KONWS TYPE STRING,
KONMS TYPE STRING,
WAERS TYPE STRING,
KOPOS TYPE STRING,
KVSL1 TYPE STRING,
KVSL2 TYPE STRING,
KZBZG TYPE STRING,
STUNR TYPE STRING,
ZAEHK TYPE STRING,
KOAID TYPE STRING,
SAKN1 TYPE STRING,
SAKN2 TYPE STRING,
KUMZA TYPE STRING,
KUMNE TYPE STRING,
KKURS TYPE STRING,
MWSK1 TYPE STRING,
MWSK2 TYPE STRING,
UPDKZ TYPE STRING,
KBFLAG TYPE STRING,END OF T_EKKO_STR.
DATA: WA_KOMLFKO_STR type T_EKKO_STR.

DATA: ld_text TYPE string.

LOOP AT IT_EKKO INTO WA_EKKO.
  MOVE-CORRESPONDING wa_EKKO TO WA_EKKO_STR.
  CONCATENATE: sy-vline
WA_KOMLFKO_STR-OLDNR sy-vline 
WA_KOMLFKO_STR-OLDPO sy-vline 
WA_KOMLFKO_STR-WBELN sy-vline 
WA_KOMLFKO_STR-KPOSN sy-vline 
WA_KOMLFKO_STR-KSCHL sy-vline 
WA_KOMLFKO_STR-KBETR sy-vline 
WA_KOMLFKO_STR-KAWRT sy-vline 
WA_KOMLFKO_STR-KWERT sy-vline 
WA_KOMLFKO_STR-KSTBS sy-vline 
WA_KOMLFKO_STR-KWAEH sy-vline 
WA_KOMLFKO_STR-KPEIN sy-vline 
WA_KOMLFKO_STR-KMEIN sy-vline 
WA_KOMLFKO_STR-KNUMH sy-vline 
WA_KOMLFKO_STR-KRECH sy-vline 
WA_KOMLFKO_STR-KRUEK sy-vline 
WA_KOMLFKO_STR-KINAK sy-vline 
WA_KOMLFKO_STR-KNTYP sy-vline 
WA_KOMLFKO_STR-KDATU sy-vline 
WA_KOMLFKO_STR-KRELI sy-vline 
WA_KOMLFKO_STR-KOLNR sy-vline 
WA_KOMLFKO_STR-KSTEU sy-vline 
WA_KOMLFKO_STR-KHERK sy-vline 
WA_KOMLFKO_STR-KSTAT sy-vline 
WA_KOMLFKO_STR-KAPPL sy-vline 
WA_KOMLFKO_STR-KONWS sy-vline 
WA_KOMLFKO_STR-KONMS sy-vline 
WA_KOMLFKO_STR-WAERS sy-vline 
WA_KOMLFKO_STR-KOPOS sy-vline 
WA_KOMLFKO_STR-KVSL1 sy-vline 
WA_KOMLFKO_STR-KVSL2 sy-vline 
WA_KOMLFKO_STR-KZBZG sy-vline 
WA_KOMLFKO_STR-STUNR sy-vline 
WA_KOMLFKO_STR-ZAEHK sy-vline 
WA_KOMLFKO_STR-KOAID sy-vline 
WA_KOMLFKO_STR-SAKN1 sy-vline 
WA_KOMLFKO_STR-SAKN2 sy-vline 
WA_KOMLFKO_STR-KUMZA sy-vline 
WA_KOMLFKO_STR-KUMNE sy-vline 
WA_KOMLFKO_STR-KKURS sy-vline 
WA_KOMLFKO_STR-MWSK1 sy-vline 
WA_KOMLFKO_STR-MWSK2 sy-vline 
WA_KOMLFKO_STR-UPDKZ sy-vline 
WA_KOMLFKO_STR-KBFLAG sy-vline      INTO ld_text SEPARATED BY SPACE.

*Add any further fields from structure WA_EKKO_STR you want to CONCATENATE...
ENDLOOP.
ENDFORM.