ABAP Select data from SAP table KNTBL into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM KNTBL
*  INTO TABLE @DATA(IT_KNTBL2).
*--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_KNTBL INDEX 1 INTO DATA(WA_KNTBL2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<KNTBL>-BUKRS = 1.
<KNTBL>-GJAHR = 1.
<KNTBL>-MONAT = 1.
<KNTBL>-BUDAT = 1.
<KNTBL>-BLDAT = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_KNTBL-BZDAT, sy-vline,
  WA_KNTBL-BUZEI, sy-vline,
  WA_KNTBL-KOKRS, sy-vline,
  WA_KNTBL-WERKS, sy-vline,
  WA_KNTBL-GSBER, sy-vline,
  WA_KNTBL-PARGB, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_KNTBL 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_KNTBL 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_KNTBL INTO WA_KNTBL.


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

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

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

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

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

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

*Conversion exit ALPHA, internal->external for field ANLN1
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_KNTBL-ANLN1
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_KNTBL-ANLN1.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field ANLN2
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_KNTBL-ANLN2
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_KNTBL-ANLN2.
WRITE:/ 'New Value:', ld_input.

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

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

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

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

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

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

*Conversion exit ALPHA, internal->external for field EGRUP
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_KNTBL-EGRUP
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_KNTBL-EGRUP.
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_KNTBL_STR, 
BUKRS TYPE STRING,
GJAHR TYPE STRING,
MONAT TYPE STRING,
BUDAT TYPE STRING,
BLDAT TYPE STRING,
BZDAT TYPE STRING,
BUZEI TYPE STRING,
KOKRS TYPE STRING,
WERKS TYPE STRING,
GSBER TYPE STRING,
PARGB TYPE STRING,
VBUND TYPE STRING,
KOART TYPE STRING,
SAKNR TYPE STRING,
HKONT TYPE STRING,
HRKFT TYPE STRING,
KOSTL TYPE STRING,
AUFNR TYPE STRING,
PROJN TYPE STRING,
ANLN1 TYPE STRING,
ANLN2 TYPE STRING,
PERNR TYPE STRING,
MATNR TYPE STRING,
PRCTR TYPE STRING,
AWTYP TYPE STRING,
MENGE TYPE STRING,
MEINS TYPE STRING,
WWERT TYPE STRING,
WAERS TYPE STRING,
VORGN TYPE STRING,
ANBWA TYPE STRING,
DMBTR TYPE STRING,
XSKST TYPE STRING,
XSAUF TYPE STRING,
XSPRO TYPE STRING,
XSERG TYPE STRING,
VNAME TYPE STRING,
RECID TYPE STRING,
EGRUP TYPE STRING,
TXJCD TYPE STRING,END OF T_EKKO_STR.
DATA: WA_KNTBL_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_KNTBL_STR-BUKRS sy-vline 
WA_KNTBL_STR-GJAHR sy-vline 
WA_KNTBL_STR-MONAT sy-vline 
WA_KNTBL_STR-BUDAT sy-vline 
WA_KNTBL_STR-BLDAT sy-vline 
WA_KNTBL_STR-BZDAT sy-vline 
WA_KNTBL_STR-BUZEI sy-vline 
WA_KNTBL_STR-KOKRS sy-vline 
WA_KNTBL_STR-WERKS sy-vline 
WA_KNTBL_STR-GSBER sy-vline 
WA_KNTBL_STR-PARGB sy-vline 
WA_KNTBL_STR-VBUND sy-vline 
WA_KNTBL_STR-KOART sy-vline 
WA_KNTBL_STR-SAKNR sy-vline 
WA_KNTBL_STR-HKONT sy-vline 
WA_KNTBL_STR-HRKFT sy-vline 
WA_KNTBL_STR-KOSTL sy-vline 
WA_KNTBL_STR-AUFNR sy-vline 
WA_KNTBL_STR-PROJN sy-vline 
WA_KNTBL_STR-ANLN1 sy-vline 
WA_KNTBL_STR-ANLN2 sy-vline 
WA_KNTBL_STR-PERNR sy-vline 
WA_KNTBL_STR-MATNR sy-vline 
WA_KNTBL_STR-PRCTR sy-vline 
WA_KNTBL_STR-AWTYP sy-vline 
WA_KNTBL_STR-MENGE sy-vline 
WA_KNTBL_STR-MEINS sy-vline 
WA_KNTBL_STR-WWERT sy-vline 
WA_KNTBL_STR-WAERS sy-vline 
WA_KNTBL_STR-VORGN sy-vline 
WA_KNTBL_STR-ANBWA sy-vline 
WA_KNTBL_STR-DMBTR sy-vline 
WA_KNTBL_STR-XSKST sy-vline 
WA_KNTBL_STR-XSAUF sy-vline 
WA_KNTBL_STR-XSPRO sy-vline 
WA_KNTBL_STR-XSERG sy-vline 
WA_KNTBL_STR-VNAME sy-vline 
WA_KNTBL_STR-RECID sy-vline 
WA_KNTBL_STR-EGRUP sy-vline 
WA_KNTBL_STR-TXJCD sy-vline      INTO ld_text SEPARATED BY SPACE.

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