ABAP Select data from SAP table KOMKCV into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM KOMKCV
*  INTO TABLE @DATA(IT_KOMKCV2).
*--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_KOMKCV INDEX 1 INTO DATA(WA_KOMKCV2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<KOMKCV>-KTOPL = 1.
<KOMKCV>-VKORG = 1.
<KOMKCV>-VTWEG = 1.
<KOMKCV>-KTGRD = 1.
<KOMKCV>-KAPPL = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_KOMKCV-KALSMC, sy-vline,
  WA_KOMKCV-RKPREL, sy-vline,
  WA_KOMKCV-LIFNR, sy-vline,
  WA_KOMKCV-LLAND, sy-vline,
  WA_KOMKCV-AUGRU, sy-vline,
  WA_KOMKCV-BUKRS, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_KOMKCV 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_KOMKCV 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_KOMKCV INTO WA_KOMKCV.


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

*Conversion exit ALPHA, internal->external for field VBUND
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_KOMKCV-VBUND
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_KOMKCV-VBUND.
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_KOMKCV_STR, 
KTOPL TYPE STRING,
VKORG TYPE STRING,
VTWEG TYPE STRING,
KTGRD TYPE STRING,
KAPPL TYPE STRING,
KALSMC TYPE STRING,
RKPREL TYPE STRING,
LIFNR TYPE STRING,
LLAND TYPE STRING,
AUGRU TYPE STRING,
BUKRS TYPE STRING,
VBUND TYPE STRING,
SETTLMT_COMPN_RSN TYPE STRING,
EKORG TYPE STRING,
KDUMMY TYPE STRING,
J_3GKBAUL TYPE STRING,
DUMMY_ACDTC_H_INCL_EEW_PS TYPE STRING,
IX_KOMT1_V TYPE STRING,
IX_KOMT1_B TYPE STRING,
CLMTY TYPE STRING,
RELTY TYPE STRING,
KATEG TYPE STRING,END OF T_EKKO_STR.
DATA: WA_KOMKCV_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_KOMKCV_STR-KTOPL sy-vline 
WA_KOMKCV_STR-VKORG sy-vline 
WA_KOMKCV_STR-VTWEG sy-vline 
WA_KOMKCV_STR-KTGRD sy-vline 
WA_KOMKCV_STR-KAPPL sy-vline 
WA_KOMKCV_STR-KALSMC sy-vline 
WA_KOMKCV_STR-RKPREL sy-vline 
WA_KOMKCV_STR-LIFNR sy-vline 
WA_KOMKCV_STR-LLAND sy-vline 
WA_KOMKCV_STR-AUGRU sy-vline 
WA_KOMKCV_STR-BUKRS sy-vline 
WA_KOMKCV_STR-VBUND sy-vline 
WA_KOMKCV_STR-SETTLMT_COMPN_RSN sy-vline 
WA_KOMKCV_STR-EKORG sy-vline 
WA_KOMKCV_STR-KDUMMY sy-vline 
WA_KOMKCV_STR-J_3GKBAUL sy-vline 
WA_KOMKCV_STR-DUMMY_ACDTC_H_INCL_EEW_PS sy-vline 
WA_KOMKCV_STR-IX_KOMT1_V sy-vline 
WA_KOMKCV_STR-IX_KOMT1_B sy-vline 
WA_KOMKCV_STR-CLMTY sy-vline 
WA_KOMKCV_STR-RELTY sy-vline 
WA_KOMKCV_STR-KATEG sy-vline      INTO ld_text SEPARATED BY SPACE.

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