ABAP Select data from SAP table KOMK4_FI into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP KOMK4_FI 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 KOMK4_FI. 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 KOMK4_FI 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_KOMK4_FI TYPE STANDARD TABLE OF KOMK4_FI,
      WA_KOMK4_FI TYPE KOMK4_FI,
      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: <KOMK4_FI> TYPE KOMK4_FI.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_KOMK4_FI.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM KOMK4_FI
  INTO TABLE IT_KOMK4_FI.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM KOMK4_FI
*  INTO TABLE @DATA(IT_KOMK4_FI2).
*--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_KOMK4_FI INDEX 1 INTO DATA(WA_KOMK4_FI2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_KOMK4_FI ASSIGNING <KOMK4_FI>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<KOMK4_FI>-BUKRS = 1.
<KOMK4_FI>-BELNR = 1.
<KOMK4_FI>-MWSKZ = 1.
<KOMK4_FI>-HKONT = 1.
<KOMK4_FI>-SHKZG = 1.

ENDLOOP.

LOOP AT IT_KOMK4_FI INTO WA_KOMK4_FI.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_KOMK4_FI-HWBAS, sy-vline,
  WA_KOMK4_FI-FWBAS, sy-vline,
  WA_KOMK4_FI-HWBA_1, sy-vline,
  WA_KOMK4_FI-HWBA_2, sy-vline,
  WA_KOMK4_FI-HWBA_3, sy-vline,
  WA_KOMK4_FI-HWSTE, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_KOMK4_FI 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_KOMK4_FI 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_KOMK4_FI INTO WA_KOMK4_FI.


*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_KOMK4_FI-BELNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_KOMK4_FI-BELNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field HKONT
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_KOMK4_FI-HKONT
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_KOMK4_FI-HKONT.
WRITE:/ 'New Value:', ld_input.

*Conversion exit AC152, internal->external for field H2BAS
CALL FUNCTION 'CONVERSION_EXIT_AC152_OUTPUT'
  EXPORTING
    input =                      WA_KOMK4_FI-H2BAS
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_KOMK4_FI-H2BAS.
WRITE:/ 'New Value:', ld_input.

*Conversion exit AC152, internal->external for field H3BAS
CALL FUNCTION 'CONVERSION_EXIT_AC152_OUTPUT'
  EXPORTING
    input =                      WA_KOMK4_FI-H3BAS
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_KOMK4_FI-H3BAS.
WRITE:/ 'New Value:', ld_input.

*Conversion exit AU132, internal->external for field H2STE
CALL FUNCTION 'CONVERSION_EXIT_AU132_OUTPUT'
  EXPORTING
    input =                      WA_KOMK4_FI-H2STE
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_KOMK4_FI-H2STE.
WRITE:/ 'New Value:', ld_input.

*Conversion exit AU132, internal->external for field H3STE
CALL FUNCTION 'CONVERSION_EXIT_AU132_OUTPUT'
  EXPORTING
    input =                      WA_KOMK4_FI-H3STE
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_KOMK4_FI-H3STE.
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_KOMK4_FI_STR, 
BUKRS TYPE STRING,
BELNR TYPE STRING,
MWSKZ TYPE STRING,
HKONT TYPE STRING,
SHKZG TYPE STRING,
HWBAS TYPE STRING,
FWBAS TYPE STRING,
HWBA_1 TYPE STRING,
HWBA_2 TYPE STRING,
HWBA_3 TYPE STRING,
HWSTE TYPE STRING,
FWSTE TYPE STRING,
HWST_1 TYPE STRING,
HWST_2 TYPE STRING,
HWST_3 TYPE STRING,
KTOSL TYPE STRING,
KNUMH TYPE STRING,
TXJCD TYPE STRING,
H2BAS TYPE STRING,
H3BAS TYPE STRING,
H2STE TYPE STRING,
H3STE TYPE STRING,END OF T_EKKO_STR.
DATA: WA_KOMK4_FI_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_KOMK4_FI_STR-BUKRS sy-vline 
WA_KOMK4_FI_STR-BELNR sy-vline 
WA_KOMK4_FI_STR-MWSKZ sy-vline 
WA_KOMK4_FI_STR-HKONT sy-vline 
WA_KOMK4_FI_STR-SHKZG sy-vline 
WA_KOMK4_FI_STR-HWBAS sy-vline 
WA_KOMK4_FI_STR-FWBAS sy-vline 
WA_KOMK4_FI_STR-HWBA_1 sy-vline 
WA_KOMK4_FI_STR-HWBA_2 sy-vline 
WA_KOMK4_FI_STR-HWBA_3 sy-vline 
WA_KOMK4_FI_STR-HWSTE sy-vline 
WA_KOMK4_FI_STR-FWSTE sy-vline 
WA_KOMK4_FI_STR-HWST_1 sy-vline 
WA_KOMK4_FI_STR-HWST_2 sy-vline 
WA_KOMK4_FI_STR-HWST_3 sy-vline 
WA_KOMK4_FI_STR-KTOSL sy-vline 
WA_KOMK4_FI_STR-KNUMH sy-vline 
WA_KOMK4_FI_STR-TXJCD sy-vline 
WA_KOMK4_FI_STR-H2BAS sy-vline 
WA_KOMK4_FI_STR-H3BAS sy-vline 
WA_KOMK4_FI_STR-H2STE sy-vline 
WA_KOMK4_FI_STR-H3STE sy-vline      INTO ld_text SEPARATED BY SPACE.

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