ABAP Select data from SAP table KOMLFK_WF into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP KOMLFK_WF 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 KOMLFK_WF. 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 KOMLFK_WF 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_KOMLFK_WF TYPE STANDARD TABLE OF KOMLFK_WF,
      WA_KOMLFK_WF TYPE KOMLFK_WF,
      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: <KOMLFK_WF> TYPE KOMLFK_WF.

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM KOMLFK_WF
*  INTO TABLE @DATA(IT_KOMLFK_WF2).
*--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_KOMLFK_WF INDEX 1 INTO DATA(WA_KOMLFK_WF2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<KOMLFK_WF>-WFDAT = 1.
<KOMLFK_WF>-RFBSK = 1.
<KOMLFK_WF>-LIFRE = 1.
<KOMLFK_WF>-LNRZB = 1.
<KOMLFK_WF>-KUNRE = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_KOMLFK_WF-KUNRG, sy-vline,
  WA_KOMLFK_WF-EKORG, sy-vline,
  WA_KOMLFK_WF-VKORG, sy-vline,
  WA_KOMLFK_WF-VTWEG, sy-vline,
  WA_KOMLFK_WF-SPART, sy-vline,
  WA_KOMLFK_WF-BUKRS, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_KOMLFK_WF 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_KOMLFK_WF 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_KOMLFK_WF INTO WA_KOMLFK_WF.


*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 LIFRE
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_KOMLFK_WF-LIFRE
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_KOMLFK_WF-LIFRE.
WRITE:/ 'New Value:', ld_input.

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

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

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

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

*Conversion exit ALPHA, internal->external for field CONTRACT
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_KOMLFK_WF-CONTRACT
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_KOMLFK_WF-CONTRACT.
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_KOMLFK_WF_STR, 
WFDAT TYPE STRING,
RFBSK TYPE STRING,
LIFRE TYPE STRING,
LNRZB TYPE STRING,
KUNRE TYPE STRING,
KUNRG TYPE STRING,
EKORG TYPE STRING,
VKORG TYPE STRING,
VTWEG TYPE STRING,
SPART TYPE STRING,
BUKRS TYPE STRING,
FKSTO TYPE STRING,
LFAKS TYPE STRING,
ABART TYPE STRING,
LFTYP TYPE STRING,
BLDAT TYPE STRING,
SETTLE_CATEGORY TYPE STRING,
UPDKZ TYPE STRING,
CONTRACT TYPE STRING,
CONTRACT_TYPE TYPE STRING,
USE_CASE TYPE STRING,
TEW_TYPE TYPE STRING,END OF T_EKKO_STR.
DATA: WA_KOMLFK_WF_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_KOMLFK_WF_STR-WFDAT sy-vline 
WA_KOMLFK_WF_STR-RFBSK sy-vline 
WA_KOMLFK_WF_STR-LIFRE sy-vline 
WA_KOMLFK_WF_STR-LNRZB sy-vline 
WA_KOMLFK_WF_STR-KUNRE sy-vline 
WA_KOMLFK_WF_STR-KUNRG sy-vline 
WA_KOMLFK_WF_STR-EKORG sy-vline 
WA_KOMLFK_WF_STR-VKORG sy-vline 
WA_KOMLFK_WF_STR-VTWEG sy-vline 
WA_KOMLFK_WF_STR-SPART sy-vline 
WA_KOMLFK_WF_STR-BUKRS sy-vline 
WA_KOMLFK_WF_STR-FKSTO sy-vline 
WA_KOMLFK_WF_STR-LFAKS sy-vline 
WA_KOMLFK_WF_STR-ABART sy-vline 
WA_KOMLFK_WF_STR-LFTYP sy-vline 
WA_KOMLFK_WF_STR-BLDAT sy-vline 
WA_KOMLFK_WF_STR-SETTLE_CATEGORY sy-vline 
WA_KOMLFK_WF_STR-UPDKZ sy-vline 
WA_KOMLFK_WF_STR-CONTRACT sy-vline 
WA_KOMLFK_WF_STR-CONTRACT_TYPE sy-vline 
WA_KOMLFK_WF_STR-USE_CASE sy-vline 
WA_KOMLFK_WF_STR-TEW_TYPE sy-vline      INTO ld_text SEPARATED BY SPACE.

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