ABAP Select data from SAP table KOMK2 into internal table

Get Example source ABAP code based on a different SAP table
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Below is a number of ABAP code snippets to demonstrate how to select data from SAP KOMK2 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 KOMK2. 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 KOMK2 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_KOMK2 TYPE STANDARD TABLE OF KOMK2,
      WA_KOMK2 TYPE KOMK2,
      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: <KOMK2> TYPE KOMK2.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_KOMK2.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM KOMK2
  INTO TABLE IT_KOMK2.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM KOMK2
*  INTO TABLE @DATA(IT_KOMK22).
*--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_KOMK2 INDEX 1 INTO DATA(WA_KOMK22).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_KOMK2 ASSIGNING <KOMK2>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<KOMK2>-BUKRS = 1.
<KOMK2>-BELNR = 1.
<KOMK2>-BSCHL = 1.
<KOMK2>-GSBER = 1.
<KOMK2>-MWSKZ = 1.

ENDLOOP.

LOOP AT IT_KOMK2 INTO WA_KOMK2.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_KOMK2-DMBTR, sy-vline,
  WA_KOMK2-WRBTR, sy-vline,
  WA_KOMK2-DMBE_1, sy-vline,
  WA_KOMK2-DMBE_2, sy-vline,
  WA_KOMK2-DMBE_3, sy-vline,
  WA_KOMK2-KUNNR, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_KOMK2 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_KOMK2 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_KOMK2 INTO WA_KOMK2.


*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 BELNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_KOMK2-BELNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_KOMK2-BELNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field KUNNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_KOMK2-KUNNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_KOMK2-KUNNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field LIFNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_KOMK2-LIFNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_KOMK2-LIFNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field FILKD
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_KOMK2-FILKD
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_KOMK2-FILKD.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field VBELN
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_KOMK2-VBELN
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_KOMK2-VBELN.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field ADRNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_KOMK2-ADRNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_KOMK2-ADRNR.
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_KOMK2_STR, 
BUKRS TYPE STRING,
BELNR TYPE STRING,
BSCHL TYPE STRING,
GSBER TYPE STRING,
MWSKZ TYPE STRING,
DMBTR TYPE STRING,
WRBTR TYPE STRING,
DMBE_1 TYPE STRING,
DMBE_2 TYPE STRING,
DMBE_3 TYPE STRING,
KUNNR TYPE STRING,
LIFNR TYPE STRING,
FILKD TYPE STRING,
ZTERM TYPE STRING,
ZFBDT TYPE STRING,
SKFBT TYPE STRING,
MABER TYPE STRING,
MSCHL TYPE STRING,
MANSP TYPE STRING,
VBELN TYPE STRING,
ADRNR TYPE STRING,
STCEG TYPE STRING,
XEGDR TYPE STRING,
ZUONR TYPE STRING,
SGTXT TYPE STRING,
ZLSCH TYPE STRING,END OF T_EKKO_STR.
DATA: WA_KOMK2_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_KOMK2_STR-BUKRS sy-vline 
WA_KOMK2_STR-BELNR sy-vline 
WA_KOMK2_STR-BSCHL sy-vline 
WA_KOMK2_STR-GSBER sy-vline 
WA_KOMK2_STR-MWSKZ sy-vline 
WA_KOMK2_STR-DMBTR sy-vline 
WA_KOMK2_STR-WRBTR sy-vline 
WA_KOMK2_STR-DMBE_1 sy-vline 
WA_KOMK2_STR-DMBE_2 sy-vline 
WA_KOMK2_STR-DMBE_3 sy-vline 
WA_KOMK2_STR-KUNNR sy-vline 
WA_KOMK2_STR-LIFNR sy-vline 
WA_KOMK2_STR-FILKD sy-vline 
WA_KOMK2_STR-ZTERM sy-vline 
WA_KOMK2_STR-ZFBDT sy-vline 
WA_KOMK2_STR-SKFBT sy-vline 
WA_KOMK2_STR-MABER sy-vline 
WA_KOMK2_STR-MSCHL sy-vline 
WA_KOMK2_STR-MANSP sy-vline 
WA_KOMK2_STR-VBELN sy-vline 
WA_KOMK2_STR-ADRNR sy-vline 
WA_KOMK2_STR-STCEG sy-vline 
WA_KOMK2_STR-XEGDR sy-vline 
WA_KOMK2_STR-ZUONR sy-vline 
WA_KOMK2_STR-SGTXT sy-vline 
WA_KOMK2_STR-ZLSCH sy-vline      INTO ld_text SEPARATED BY SPACE.

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