ABAP Select data from SAP table GKOMV into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM GKOMV
*  INTO TABLE @DATA(IT_GKOMV2).
*--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_GKOMV INDEX 1 INTO DATA(WA_GKOMV2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<GKOMV>-KEY = 1.
<GKOMV>-MANDT = 1.
<GKOMV>-KSCHL = 1.
<GKOMV>-VAKEY = 1.
<GKOMV>-KNUMH = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_GKOMV-KOPOS, sy-vline,
  WA_GKOMV-ZAEKO, sy-vline,
  WA_GKOMV-KRECH, sy-vline,
  WA_GKOMV-MDFLG, sy-vline,
  WA_GKOMV-WAERS, sy-vline,
  WA_GKOMV-WAERK, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_GKOMV 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_GKOMV 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_GKOMV INTO WA_GKOMV.


*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 CUNIT, internal->external for field KONMS
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_GKOMV-KONMS
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_GKOMV-KONMS.
WRITE:/ 'New Value:', ld_input.

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

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

*Conversion exit CUNIT, internal->external for field KMEIN
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_GKOMV-KMEIN
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_GKOMV-KMEIN.
WRITE:/ 'New Value:', ld_input.

*Conversion exit CUNIT, internal->external for field VOLEH
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_GKOMV-VOLEH
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_GKOMV-VOLEH.
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_GKOMV_STR, 
KEY TYPE STRING,
MANDT TYPE STRING,
KSCHL TYPE STRING,
VAKEY TYPE STRING,
KNUMH TYPE STRING,
KOPOS TYPE STRING,
ZAEKO TYPE STRING,
KRECH TYPE STRING,
MDFLG TYPE STRING,
WAERS TYPE STRING,
WAERK TYPE STRING,
HWAER TYPE STRING,
KNTYP TYPE STRING,
MWSK1 TYPE STRING,
ZTERM TYPE STRING,
ZBD1P TYPE STRING,
KHERK TYPE STRING,
KSTEU TYPE STRING,
KOFRM TYPE STRING,
KOFRS TYPE STRING,
KZBZG TYPE STRING,
STFKZ TYPE STRING,
TXPRF TYPE STRING,
GANZZ TYPE STRING,
KONMS TYPE STRING,
KONWS TYPE STRING,
KYBTR TYPE STRING,
ZAEHK_KO TYPE STRING,
CCS_USAGE TYPE STRING,
KAPPL TYPE STRING,
IX_KOMV TYPE STRING,
IX_AKTPOS TYPE STRING,
SHKZG TYPE STRING,
KKURS TYPE STRING,
KURSK TYPE STRING,
PRSDT TYPE STRING,
ALAND TYPE STRING,
KMAXW TYPE STRING,
KAWRT TYPE STRING,
KBETR TYPE STRING,
KMEIN TYPE STRING,
KPEIN TYPE STRING,
KUMZA TYPE STRING,
KUMNE TYPE STRING,
SUMPS TYPE STRING,
KWERT TYPE STRING,
KWERT_K TYPE STRING,
KWAEH TYPE STRING,
KSTBS TYPE STRING,
VOLUM TYPE STRING,
VOLEH TYPE STRING,
KDUPL TYPE STRING,
RDIFA TYPE STRING,
KINAK TYPE STRING,
IX_GKOMV TYPE STRING,
C_KSTBS TYPE STRING,
IX_CGKOMV TYPE STRING,
OLD_KSTBS TYPE STRING,
KDATU TYPE STRING,
KMAXW_ORIGIN TYPE STRING,
KMXWR TYPE STRING,END OF T_EKKO_STR.
DATA: WA_GKOMV_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_GKOMV_STR-KEY sy-vline 
WA_GKOMV_STR-MANDT sy-vline 
WA_GKOMV_STR-KSCHL sy-vline 
WA_GKOMV_STR-VAKEY sy-vline 
WA_GKOMV_STR-KNUMH sy-vline 
WA_GKOMV_STR-KOPOS sy-vline 
WA_GKOMV_STR-ZAEKO sy-vline 
WA_GKOMV_STR-KRECH sy-vline 
WA_GKOMV_STR-MDFLG sy-vline 
WA_GKOMV_STR-WAERS sy-vline 
WA_GKOMV_STR-WAERK sy-vline 
WA_GKOMV_STR-HWAER sy-vline 
WA_GKOMV_STR-KNTYP sy-vline 
WA_GKOMV_STR-MWSK1 sy-vline 
WA_GKOMV_STR-ZTERM sy-vline 
WA_GKOMV_STR-ZBD1P sy-vline 
WA_GKOMV_STR-KHERK sy-vline 
WA_GKOMV_STR-KSTEU sy-vline 
WA_GKOMV_STR-KOFRM sy-vline 
WA_GKOMV_STR-KOFRS sy-vline 
WA_GKOMV_STR-KZBZG sy-vline 
WA_GKOMV_STR-STFKZ sy-vline 
WA_GKOMV_STR-TXPRF sy-vline 
WA_GKOMV_STR-GANZZ sy-vline 
WA_GKOMV_STR-KONMS sy-vline 
WA_GKOMV_STR-KONWS sy-vline 
WA_GKOMV_STR-KYBTR sy-vline 
WA_GKOMV_STR-ZAEHK_KO sy-vline 
WA_GKOMV_STR-CCS_USAGE sy-vline 
WA_GKOMV_STR-KAPPL sy-vline 
WA_GKOMV_STR-IX_KOMV sy-vline 
WA_GKOMV_STR-IX_AKTPOS sy-vline 
WA_GKOMV_STR-SHKZG sy-vline 
WA_GKOMV_STR-KKURS sy-vline 
WA_GKOMV_STR-KURSK sy-vline 
WA_GKOMV_STR-PRSDT sy-vline 
WA_GKOMV_STR-ALAND sy-vline 
WA_GKOMV_STR-KMAXW sy-vline 
WA_GKOMV_STR-KAWRT sy-vline 
WA_GKOMV_STR-KBETR sy-vline 
WA_GKOMV_STR-KMEIN sy-vline 
WA_GKOMV_STR-KPEIN sy-vline 
WA_GKOMV_STR-KUMZA sy-vline 
WA_GKOMV_STR-KUMNE sy-vline 
WA_GKOMV_STR-SUMPS sy-vline 
WA_GKOMV_STR-KWERT sy-vline 
WA_GKOMV_STR-KWERT_K sy-vline 
WA_GKOMV_STR-KWAEH sy-vline 
WA_GKOMV_STR-KSTBS sy-vline 
WA_GKOMV_STR-VOLUM sy-vline 
WA_GKOMV_STR-VOLEH sy-vline 
WA_GKOMV_STR-KDUPL sy-vline 
WA_GKOMV_STR-RDIFA sy-vline 
WA_GKOMV_STR-KINAK sy-vline 
WA_GKOMV_STR-IX_GKOMV sy-vline 
WA_GKOMV_STR-C_KSTBS sy-vline 
WA_GKOMV_STR-IX_CGKOMV sy-vline 
WA_GKOMV_STR-OLD_KSTBS sy-vline 
WA_GKOMV_STR-KDATU sy-vline 
WA_GKOMV_STR-KMAXW_ORIGIN sy-vline 
WA_GKOMV_STR-KMXWR sy-vline      INTO ld_text SEPARATED BY SPACE.

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