ABAP Select data from SAP table WLF_KOMLFK_TM into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM WLF_KOMLFK_TM
*  INTO TABLE @DATA(IT_WLF_KOMLFK_TM2).
*--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_WLF_KOMLFK_TM INDEX 1 INTO DATA(WA_WLF_KOMLFK_TM2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<WLF_KOMLFK_TM>-WBELN = 1.
<WLF_KOMLFK_TM>-USE_CASE = 1.
<WLF_KOMLFK_TM>-CORR_DOCUMENT = 1.
<WLF_KOMLFK_TM>-LFART = 1.
<WLF_KOMLFK_TM>-LFART_TXT = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_WLF_KOMLFK_TM-WRART, sy-vline,
  WA_WLF_KOMLFK_TM-WRART_TXT, sy-vline,
  WA_WLF_KOMLFK_TM-WFDAT, sy-vline,
  WA_WLF_KOMLFK_TM-BLDAT, sy-vline,
  WA_WLF_KOMLFK_TM-EKORG, sy-vline,
  WA_WLF_KOMLFK_TM-EKGRP, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_WLF_KOMLFK_TM 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_WLF_KOMLFK_TM 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_WLF_KOMLFK_TM INTO WA_WLF_KOMLFK_TM.


*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_WLF_KOMLFK_TM-WBELN
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_WLF_KOMLFK_TM-WBELN.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field LFAKS
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_WLF_KOMLFK_TM-LFAKS
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_WLF_KOMLFK_TM-LFAKS.
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_WLF_KOMLFK_TM_STR, 
WBELN TYPE STRING,
USE_CASE TYPE STRING,
CORR_DOCUMENT TYPE STRING,
LFART TYPE STRING,
LFART_TXT TYPE STRING,
WRART TYPE STRING,
WRART_TXT TYPE STRING,
WFDAT TYPE STRING,
BLDAT TYPE STRING,
EKORG TYPE STRING,
EKGRP TYPE STRING,
VKORG TYPE STRING,
VTWEG TYPE STRING,
SPART TYPE STRING,
BUKRS TYPE STRING,
NETWR TYPE STRING,
WAERL TYPE STRING,
RFBSK TYPE STRING,
LFTYP TYPE STRING,
XBLNR TYPE STRING,
ZUONR TYPE STRING,
KIDNO TYPE STRING,
FKSTO TYPE STRING,
LFAKS TYPE STRING,
ERDAT TYPE STRING,
ERZET TYPE STRING,
ERNAM TYPE STRING,
ARCHIV TYPE STRING,
SELKZ TYPE STRING,
WDTYP TYPE STRING,END OF T_EKKO_STR.
DATA: WA_WLF_KOMLFK_TM_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_WLF_KOMLFK_TM_STR-WBELN sy-vline 
WA_WLF_KOMLFK_TM_STR-USE_CASE sy-vline 
WA_WLF_KOMLFK_TM_STR-CORR_DOCUMENT sy-vline 
WA_WLF_KOMLFK_TM_STR-LFART sy-vline 
WA_WLF_KOMLFK_TM_STR-LFART_TXT sy-vline 
WA_WLF_KOMLFK_TM_STR-WRART sy-vline 
WA_WLF_KOMLFK_TM_STR-WRART_TXT sy-vline 
WA_WLF_KOMLFK_TM_STR-WFDAT sy-vline 
WA_WLF_KOMLFK_TM_STR-BLDAT sy-vline 
WA_WLF_KOMLFK_TM_STR-EKORG sy-vline 
WA_WLF_KOMLFK_TM_STR-EKGRP sy-vline 
WA_WLF_KOMLFK_TM_STR-VKORG sy-vline 
WA_WLF_KOMLFK_TM_STR-VTWEG sy-vline 
WA_WLF_KOMLFK_TM_STR-SPART sy-vline 
WA_WLF_KOMLFK_TM_STR-BUKRS sy-vline 
WA_WLF_KOMLFK_TM_STR-NETWR sy-vline 
WA_WLF_KOMLFK_TM_STR-WAERL sy-vline 
WA_WLF_KOMLFK_TM_STR-RFBSK sy-vline 
WA_WLF_KOMLFK_TM_STR-LFTYP sy-vline 
WA_WLF_KOMLFK_TM_STR-XBLNR sy-vline 
WA_WLF_KOMLFK_TM_STR-ZUONR sy-vline 
WA_WLF_KOMLFK_TM_STR-KIDNO sy-vline 
WA_WLF_KOMLFK_TM_STR-FKSTO sy-vline 
WA_WLF_KOMLFK_TM_STR-LFAKS sy-vline 
WA_WLF_KOMLFK_TM_STR-ERDAT sy-vline 
WA_WLF_KOMLFK_TM_STR-ERZET sy-vline 
WA_WLF_KOMLFK_TM_STR-ERNAM sy-vline 
WA_WLF_KOMLFK_TM_STR-ARCHIV sy-vline 
WA_WLF_KOMLFK_TM_STR-SELKZ sy-vline 
WA_WLF_KOMLFK_TM_STR-WDTYP sy-vline      INTO ld_text SEPARATED BY SPACE.

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