ABAP Select data from SAP table KNKKF1 into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP KNKKF1 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 KNKKF1. 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 KNKKF1 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_KNKKF1 TYPE STANDARD TABLE OF KNKKF1,
      WA_KNKKF1 TYPE KNKKF1,
      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: <KNKKF1> TYPE KNKKF1.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_KNKKF1.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM KNKKF1
  INTO TABLE IT_KNKKF1.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM KNKKF1
*  INTO TABLE @DATA(IT_KNKKF12).
*--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_KNKKF1 INDEX 1 INTO DATA(WA_KNKKF12).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_KNKKF1 ASSIGNING <KNKKF1>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<KNKKF1>-MANDT = 1.
<KNKKF1>-LOGSYS = 1.
<KNKKF1>-KUNNR = 1.
<KNKKF1>-KKBER = 1.
<KNKKF1>-REGUL = 1.

ENDLOOP.

LOOP AT IT_KNKKF1 INTO WA_KNKKF1.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_KNKKF1-TMSTMP, sy-vline,
  WA_KNKKF1-SFAEL, sy-vline,
  WA_KNKKF1-WAERS, sy-vline,
  WA_KNKKF1-BUKRSM, sy-vline,
  WA_KNKKF1-KUNNRM, sy-vline,
  WA_KNKKF1-MABER, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_KNKKF1 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_KNKKF1 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_KNKKF1 INTO WA_KNKKF1.


*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 LOGSYS
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_KNKKF1-LOGSYS
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_KNKKF1-LOGSYS.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field KUNNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_KNKKF1-KUNNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_KNKKF1-KUNNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit AC152, internal->external for field SFAEL
CALL FUNCTION 'CONVERSION_EXIT_AC152_OUTPUT'
  EXPORTING
    input =                      WA_KNKKF1-SFAEL
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_KNKKF1-SFAEL.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field KUNNRM
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_KNKKF1-KUNNRM
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_KNKKF1-KUNNRM.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field BELNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_KNKKF1-BELNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_KNKKF1-BELNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit GJAHR, internal->external for field GJAHR
CALL FUNCTION 'CONVERSION_EXIT_GJAHR_OUTPUT'
  EXPORTING
    input =                      WA_KNKKF1-GJAHR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_KNKKF1-GJAHR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field KUNNROOI
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_KNKKF1-KUNNROOI
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_KNKKF1-KUNNROOI.
WRITE:/ 'New Value:', ld_input.

*Conversion exit AU132, internal->external for field WRBTR
CALL FUNCTION 'CONVERSION_EXIT_AU132_OUTPUT'
  EXPORTING
    input =                      WA_KNKKF1-WRBTR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_KNKKF1-WRBTR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit AU152, internal->external for field KLIMK
CALL FUNCTION 'CONVERSION_EXIT_AU152_OUTPUT'
  EXPORTING
    input =                      WA_KNKKF1-KLIMK
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_KNKKF1-KLIMK.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field KNKLI
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_KNKKF1-KNKLI
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_KNKKF1-KNKLI.
WRITE:/ 'New Value:', ld_input.

*Conversion exit AC152, internal->external for field SKFOR
CALL FUNCTION 'CONVERSION_EXIT_AC152_OUTPUT'
  EXPORTING
    input =                      WA_KNKKF1-SKFOR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_KNKKF1-SKFOR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit AC152, internal->external for field SSOBL
CALL FUNCTION 'CONVERSION_EXIT_AC152_OUTPUT'
  EXPORTING
    input =                      WA_KNKKF1-SSOBL
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_KNKKF1-SSOBL.
WRITE:/ 'New Value:', ld_input.

*Conversion exit AC152, internal->external for field ABSBT
CALL FUNCTION 'CONVERSION_EXIT_AC152_OUTPUT'
  EXPORTING
    input =                      WA_KNKKF1-ABSBT
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_KNKKF1-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_KNKKF1_STR, 
MANDT TYPE STRING,
LOGSYS TYPE STRING,
KUNNR TYPE STRING,
KKBER TYPE STRING,
REGUL TYPE STRING,
TMSTMP TYPE STRING,
SFAEL TYPE STRING,
WAERS TYPE STRING,
BUKRSM TYPE STRING,
KUNNRM TYPE STRING,
MABER TYPE STRING,
MAHNS TYPE STRING,
BELNR TYPE STRING,
BUKRSOOI TYPE STRING,
FAEDT TYPE STRING,
GJAHR TYPE STRING,
INFAE TYPE STRING,
KUNNROOI TYPE STRING,
VERZN TYPE STRING,
WAERSOOI TYPE STRING,
WRBTR TYPE STRING,
KLIMK TYPE STRING,
KNKLI TYPE STRING,
SKFOR TYPE STRING,
SSOBL TYPE STRING,
WAERS_KNKK TYPE STRING,
CTLPC TYPE STRING,
CRBLB TYPE STRING,
NXTRV TYPE STRING,
ABSBT TYPE STRING,END OF T_EKKO_STR.
DATA: WA_KNKKF1_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_KNKKF1_STR-MANDT sy-vline 
WA_KNKKF1_STR-LOGSYS sy-vline 
WA_KNKKF1_STR-KUNNR sy-vline 
WA_KNKKF1_STR-KKBER sy-vline 
WA_KNKKF1_STR-REGUL sy-vline 
WA_KNKKF1_STR-TMSTMP sy-vline 
WA_KNKKF1_STR-SFAEL sy-vline 
WA_KNKKF1_STR-WAERS sy-vline 
WA_KNKKF1_STR-BUKRSM sy-vline 
WA_KNKKF1_STR-KUNNRM sy-vline 
WA_KNKKF1_STR-MABER sy-vline 
WA_KNKKF1_STR-MAHNS sy-vline 
WA_KNKKF1_STR-BELNR sy-vline 
WA_KNKKF1_STR-BUKRSOOI sy-vline 
WA_KNKKF1_STR-FAEDT sy-vline 
WA_KNKKF1_STR-GJAHR sy-vline 
WA_KNKKF1_STR-INFAE sy-vline 
WA_KNKKF1_STR-KUNNROOI sy-vline 
WA_KNKKF1_STR-VERZN sy-vline 
WA_KNKKF1_STR-WAERSOOI sy-vline 
WA_KNKKF1_STR-WRBTR sy-vline 
WA_KNKKF1_STR-KLIMK sy-vline 
WA_KNKKF1_STR-KNKLI sy-vline 
WA_KNKKF1_STR-SKFOR sy-vline 
WA_KNKKF1_STR-SSOBL sy-vline 
WA_KNKKF1_STR-WAERS_KNKK sy-vline 
WA_KNKKF1_STR-CTLPC sy-vline 
WA_KNKKF1_STR-CRBLB sy-vline 
WA_KNKKF1_STR-NXTRV sy-vline 
WA_KNKKF1_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.