ABAP Select data from SAP table KOMLFKOCX into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM KOMLFKOCX
*  INTO TABLE @DATA(IT_KOMLFKOCX2).
*--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_KOMLFKOCX INDEX 1 INTO DATA(WA_KOMLFKOCX2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<KOMLFKOCX>-WBELN = 1.
<KOMLFKOCX>-POSNR = 1.
<KOMLFKOCX>-STUNR = 1.
<KOMLFKOCX>-ZAEHK = 1.
<KOMLFKOCX>-KSCHL = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_KOMLFKOCX-KBETR, sy-vline,
  WA_KOMLFKOCX-WAERS, sy-vline,
  WA_KOMLFKOCX-KMEIN, sy-vline,
  WA_KOMLFKOCX-KPEIN, sy-vline,
  WA_KOMLFKOCX-UPDKZ, sy-vline,
  WA_KOMLFKOCX-KWERT_INX, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_KOMLFKOCX 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_KOMLFKOCX 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_KOMLFKOCX INTO WA_KOMLFKOCX.


*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_KOMLFKOCX-WBELN
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_KOMLFKOCX-WBELN.
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_KOMLFKOCX_STR, 
WBELN TYPE STRING,
POSNR TYPE STRING,
STUNR TYPE STRING,
ZAEHK TYPE STRING,
KSCHL TYPE STRING,
KBETR TYPE STRING,
WAERS TYPE STRING,
KMEIN TYPE STRING,
KPEIN TYPE STRING,
UPDKZ TYPE STRING,
KWERT_INX TYPE STRING,
KSTEU_INX TYPE STRING,
KWERT TYPE STRING,
KSTEU TYPE STRING,END OF T_EKKO_STR.
DATA: WA_KOMLFKOCX_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_KOMLFKOCX_STR-WBELN sy-vline 
WA_KOMLFKOCX_STR-POSNR sy-vline 
WA_KOMLFKOCX_STR-STUNR sy-vline 
WA_KOMLFKOCX_STR-ZAEHK sy-vline 
WA_KOMLFKOCX_STR-KSCHL sy-vline 
WA_KOMLFKOCX_STR-KBETR sy-vline 
WA_KOMLFKOCX_STR-WAERS sy-vline 
WA_KOMLFKOCX_STR-KMEIN sy-vline 
WA_KOMLFKOCX_STR-KPEIN sy-vline 
WA_KOMLFKOCX_STR-UPDKZ sy-vline 
WA_KOMLFKOCX_STR-KWERT_INX sy-vline 
WA_KOMLFKOCX_STR-KSTEU_INX sy-vline 
WA_KOMLFKOCX_STR-KWERT sy-vline 
WA_KOMLFKOCX_STR-KSTEU sy-vline      INTO ld_text SEPARATED BY SPACE.

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