ABAP Select data from SAP table KOMPV into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM KOMPV
*  INTO TABLE @DATA(IT_KOMPV2).
*--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_KOMPV INDEX 1 INTO DATA(WA_KOMPV2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<KOMPV>-POBJKEY = 1.
<KOMPV>-POBJPOS = 1.
<KOMPV>-VELIN = 1.
<KOMPV>-MATNR = 1.
<KOMPV>-CHARG = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_KOMPV-WERKS, sy-vline,
  WA_KOMPV-LGORT, sy-vline,
  WA_KOMPV-BESTQ, sy-vline,
  WA_KOMPV-SOBKZ, sy-vline,
  WA_KOMPV-SONUM, sy-vline,
  WA_KOMPV-QPLOS, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_KOMPV 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_KOMPV 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_KOMPV INTO WA_KOMPV.


*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 MATN1, internal->external for field MATNR
CALL FUNCTION 'CONVERSION_EXIT_MATN1_OUTPUT'
  EXPORTING
    input =                      WA_KOMPV-MATNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_KOMPV-MATNR.
WRITE:/ 'New Value:', ld_input.

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

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

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

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

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

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

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

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

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

*Conversion exit MATN1, internal->external for field RMATP
CALL FUNCTION 'CONVERSION_EXIT_MATN1_OUTPUT'
  EXPORTING
    input =                      WA_KOMPV-RMATP
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_KOMPV-RMATP.
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_KOMPV_STR, 
POBJKEY TYPE STRING,
POBJPOS TYPE STRING,
VELIN TYPE STRING,
MATNR TYPE STRING,
CHARG TYPE STRING,
WERKS TYPE STRING,
LGORT TYPE STRING,
BESTQ TYPE STRING,
SOBKZ TYPE STRING,
SONUM TYPE STRING,
QPLOS TYPE STRING,
UMLGO TYPE STRING,
OPMNG TYPE STRING,
VRKME TYPE STRING,
BRGEW TYPE STRING,
GEWEI TYPE STRING,
VOLUM TYPE STRING,
VOLEH TYPE STRING,
UMVKZ TYPE STRING,
UMVKN TYPE STRING,
MEINS TYPE STRING,
VENUM TYPE STRING,
MAGRV TYPE STRING,
VBTYP TYPE STRING,
KUNNR TYPE STRING,
KUNAG TYPE STRING,
ERLKZ TYPE STRING,
LGNUM TYPE STRING,
LGTYP TYPE STRING,
VLTYP TYPE STRING,
NLTYP TYPE STRING,
KOBER TYPE STRING,
ABRVW TYPE STRING,
VSTEL TYPE STRING,
LSTEL TYPE STRING,
ABLAD TYPE STRING,
XCHAR TYPE STRING,
XCHPF TYPE STRING,
RMATP TYPE STRING,END OF T_EKKO_STR.
DATA: WA_KOMPV_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_KOMPV_STR-POBJKEY sy-vline 
WA_KOMPV_STR-POBJPOS sy-vline 
WA_KOMPV_STR-VELIN sy-vline 
WA_KOMPV_STR-MATNR sy-vline 
WA_KOMPV_STR-CHARG sy-vline 
WA_KOMPV_STR-WERKS sy-vline 
WA_KOMPV_STR-LGORT sy-vline 
WA_KOMPV_STR-BESTQ sy-vline 
WA_KOMPV_STR-SOBKZ sy-vline 
WA_KOMPV_STR-SONUM sy-vline 
WA_KOMPV_STR-QPLOS sy-vline 
WA_KOMPV_STR-UMLGO sy-vline 
WA_KOMPV_STR-OPMNG sy-vline 
WA_KOMPV_STR-VRKME sy-vline 
WA_KOMPV_STR-BRGEW sy-vline 
WA_KOMPV_STR-GEWEI sy-vline 
WA_KOMPV_STR-VOLUM sy-vline 
WA_KOMPV_STR-VOLEH sy-vline 
WA_KOMPV_STR-UMVKZ sy-vline 
WA_KOMPV_STR-UMVKN sy-vline 
WA_KOMPV_STR-MEINS sy-vline 
WA_KOMPV_STR-VENUM sy-vline 
WA_KOMPV_STR-MAGRV sy-vline 
WA_KOMPV_STR-VBTYP sy-vline 
WA_KOMPV_STR-KUNNR sy-vline 
WA_KOMPV_STR-KUNAG sy-vline 
WA_KOMPV_STR-ERLKZ sy-vline 
WA_KOMPV_STR-LGNUM sy-vline 
WA_KOMPV_STR-LGTYP sy-vline 
WA_KOMPV_STR-VLTYP sy-vline 
WA_KOMPV_STR-NLTYP sy-vline 
WA_KOMPV_STR-KOBER sy-vline 
WA_KOMPV_STR-ABRVW sy-vline 
WA_KOMPV_STR-VSTEL sy-vline 
WA_KOMPV_STR-LSTEL sy-vline 
WA_KOMPV_STR-ABLAD sy-vline 
WA_KOMPV_STR-XCHAR sy-vline 
WA_KOMPV_STR-XCHPF sy-vline 
WA_KOMPV_STR-RMATP sy-vline      INTO ld_text SEPARATED BY SPACE.

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