ABAP Select data from SAP table KOMLFKC into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM KOMLFKC
*  INTO TABLE @DATA(IT_KOMLFKC2).
*--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_KOMLFKC INDEX 1 INTO DATA(WA_KOMLFKC2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<KOMLFKC>-WFDAT = 1.
<KOMLFKC>-BLDAT = 1.
<KOMLFKC>-ZTERM = 1.
<KOMLFKC>-ZBD1T = 1.
<KOMLFKC>-ZBD1P = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_KOMLFKC-ZBD2T, sy-vline,
  WA_KOMLFKC-ZBD2P, sy-vline,
  WA_KOMLFKC-ZBD3T, sy-vline,
  WA_KOMLFKC-ZLSCH, sy-vline,
  WA_KOMLFKC-ZTERMD, sy-vline,
  WA_KOMLFKC-ZBD1TD, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_KOMLFKC 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_KOMLFKC 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_KOMLFKC INTO WA_KOMLFKC.


*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 EXCRT, internal->external for field WKURS_P1
CALL FUNCTION 'CONVERSION_EXIT_EXCRT_OUTPUT'
  EXPORTING
    input =                      WA_KOMLFKC-WKURS_P1
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_KOMLFKC-WKURS_P1.
WRITE:/ 'New Value:', ld_input.

*Conversion exit EXCRT, internal->external for field WKURS_P2
CALL FUNCTION 'CONVERSION_EXIT_EXCRT_OUTPUT'
  EXPORTING
    input =                      WA_KOMLFKC-WKURS_P2
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_KOMLFKC-WKURS_P2.
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_KOMLFKC_STR, 
WFDAT TYPE STRING,
BLDAT TYPE STRING,
ZTERM TYPE STRING,
ZBD1T TYPE STRING,
ZBD1P TYPE STRING,
ZBD2T TYPE STRING,
ZBD2P TYPE STRING,
ZBD3T TYPE STRING,
ZLSCH TYPE STRING,
ZTERMD TYPE STRING,
ZBD1TD TYPE STRING,
ZBD1PD TYPE STRING,
ZBD2TD TYPE STRING,
ZBD2PD TYPE STRING,
ZBD3TD TYPE STRING,
ZLSCHD TYPE STRING,
VALTG TYPE STRING,
VALDT TYPE STRING,
VALTGD TYPE STRING,
VALDTD TYPE STRING,
WFDAT_RL TYPE STRING,
KIDNO TYPE STRING,
XBLNR TYPE STRING,
ZUONR TYPE STRING,
WKURS_P1 TYPE STRING,
WKURS_P2 TYPE STRING,
WPYCUR_P1 TYPE STRING,
WPYCUR_P2 TYPE STRING,
MONAT TYPE STRING,
BANK_DATA TYPE STRING,END OF T_EKKO_STR.
DATA: WA_KOMLFKC_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_KOMLFKC_STR-WFDAT sy-vline 
WA_KOMLFKC_STR-BLDAT sy-vline 
WA_KOMLFKC_STR-ZTERM sy-vline 
WA_KOMLFKC_STR-ZBD1T sy-vline 
WA_KOMLFKC_STR-ZBD1P sy-vline 
WA_KOMLFKC_STR-ZBD2T sy-vline 
WA_KOMLFKC_STR-ZBD2P sy-vline 
WA_KOMLFKC_STR-ZBD3T sy-vline 
WA_KOMLFKC_STR-ZLSCH sy-vline 
WA_KOMLFKC_STR-ZTERMD sy-vline 
WA_KOMLFKC_STR-ZBD1TD sy-vline 
WA_KOMLFKC_STR-ZBD1PD sy-vline 
WA_KOMLFKC_STR-ZBD2TD sy-vline 
WA_KOMLFKC_STR-ZBD2PD sy-vline 
WA_KOMLFKC_STR-ZBD3TD sy-vline 
WA_KOMLFKC_STR-ZLSCHD sy-vline 
WA_KOMLFKC_STR-VALTG sy-vline 
WA_KOMLFKC_STR-VALDT sy-vline 
WA_KOMLFKC_STR-VALTGD sy-vline 
WA_KOMLFKC_STR-VALDTD sy-vline 
WA_KOMLFKC_STR-WFDAT_RL sy-vline 
WA_KOMLFKC_STR-KIDNO sy-vline 
WA_KOMLFKC_STR-XBLNR sy-vline 
WA_KOMLFKC_STR-ZUONR sy-vline 
WA_KOMLFKC_STR-WKURS_P1 sy-vline 
WA_KOMLFKC_STR-WKURS_P2 sy-vline 
WA_KOMLFKC_STR-WPYCUR_P1 sy-vline 
WA_KOMLFKC_STR-WPYCUR_P2 sy-vline 
WA_KOMLFKC_STR-MONAT sy-vline 
WA_KOMLFKC_STR-BANK_DATA sy-vline      INTO ld_text SEPARATED BY SPACE.

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