ABAP Select data from SAP table KNKK into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM KNKK
*  INTO TABLE @DATA(IT_KNKK2).
*--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_KNKK INDEX 1 INTO DATA(WA_KNKK2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<KNKK>-MANDT = 1.
<KNKK>-KUNNR = 1.
<KNKK>-KKBER = 1.
<KNKK>-KLIMK = 1.
<KNKK>-KNKLI = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_KNKK-SAUFT, sy-vline,
  WA_KNKK-SKFOR, sy-vline,
  WA_KNKK-SSOBL, sy-vline,
  WA_KNKK-UEDAT, sy-vline,
  WA_KNKK-XCHNG, sy-vline,
  WA_KNKK-ERNAM, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_KNKK 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_KNKK 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_KNKK INTO WA_KNKK.


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

*Conversion exit AU152, internal->external for field KLIMK
CALL FUNCTION 'CONVERSION_EXIT_AU152_OUTPUT'
  EXPORTING
    input =                      WA_KNKK-KLIMK
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_KNKK-KLIMK.
WRITE:/ 'New Value:', ld_input.

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

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

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

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

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

*Conversion exit AU152, internal->external for field DBEKR
CALL FUNCTION 'CONVERSION_EXIT_AU152_OUTPUT'
  EXPORTING
    input =                      WA_KNKK-DBEKR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_KNKK-DBEKR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit AC152, internal->external for field ABSBT
CALL FUNCTION 'CONVERSION_EXIT_AC152_OUTPUT'
  EXPORTING
    input =                      WA_KNKK-ABSBT
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_KNKK-ABSBT.
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_KNKK_STR, 
MANDT TYPE STRING,
KUNNR TYPE STRING,
KKBER TYPE STRING,
KLIMK TYPE STRING,
KNKLI TYPE STRING,
SAUFT TYPE STRING,
SKFOR TYPE STRING,
SSOBL TYPE STRING,
UEDAT TYPE STRING,
XCHNG TYPE STRING,
ERNAM TYPE STRING,
ERDAT TYPE STRING,
CTLPC TYPE STRING,
DTREV TYPE STRING,
CRBLB TYPE STRING,
SBGRP TYPE STRING,
NXTRV TYPE STRING,
KRAUS TYPE STRING,
PAYDB TYPE STRING,
DBRAT TYPE STRING,
REVDB TYPE STRING,
AEDAT TYPE STRING,
AETXT TYPE STRING,
GRUPP TYPE STRING,
AENAM TYPE STRING,
SBDAT TYPE STRING,
KDGRP TYPE STRING,
CASHD TYPE STRING,
CASHA TYPE STRING,
CASHC TYPE STRING,
DBPAY TYPE STRING,
DBRTG TYPE STRING,
DBEKR TYPE STRING,
DBWAE TYPE STRING,
DBMON TYPE STRING,
ABSBT TYPE STRING,END OF T_EKKO_STR.
DATA: WA_KNKK_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_KNKK_STR-MANDT sy-vline 
WA_KNKK_STR-KUNNR sy-vline 
WA_KNKK_STR-KKBER sy-vline 
WA_KNKK_STR-KLIMK sy-vline 
WA_KNKK_STR-KNKLI sy-vline 
WA_KNKK_STR-SAUFT sy-vline 
WA_KNKK_STR-SKFOR sy-vline 
WA_KNKK_STR-SSOBL sy-vline 
WA_KNKK_STR-UEDAT sy-vline 
WA_KNKK_STR-XCHNG sy-vline 
WA_KNKK_STR-ERNAM sy-vline 
WA_KNKK_STR-ERDAT sy-vline 
WA_KNKK_STR-CTLPC sy-vline 
WA_KNKK_STR-DTREV sy-vline 
WA_KNKK_STR-CRBLB sy-vline 
WA_KNKK_STR-SBGRP sy-vline 
WA_KNKK_STR-NXTRV sy-vline 
WA_KNKK_STR-KRAUS sy-vline 
WA_KNKK_STR-PAYDB sy-vline 
WA_KNKK_STR-DBRAT sy-vline 
WA_KNKK_STR-REVDB sy-vline 
WA_KNKK_STR-AEDAT sy-vline 
WA_KNKK_STR-AETXT sy-vline 
WA_KNKK_STR-GRUPP sy-vline 
WA_KNKK_STR-AENAM sy-vline 
WA_KNKK_STR-SBDAT sy-vline 
WA_KNKK_STR-KDGRP sy-vline 
WA_KNKK_STR-CASHD sy-vline 
WA_KNKK_STR-CASHA sy-vline 
WA_KNKK_STR-CASHC sy-vline 
WA_KNKK_STR-DBPAY sy-vline 
WA_KNKK_STR-DBRTG sy-vline 
WA_KNKK_STR-DBEKR sy-vline 
WA_KNKK_STR-DBWAE sy-vline 
WA_KNKK_STR-DBMON sy-vline 
WA_KNKK_STR-ABSBT sy-vline      INTO ld_text SEPARATED BY SPACE.

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