ABAP Select data from SAP table VFKNVB into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM VFKNVB
*  INTO TABLE @DATA(IT_VFKNVB2).
*--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_VFKNVB INDEX 1 INTO DATA(WA_VFKNVB2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<VFKNVB>-MANDT = 1.
<VFKNVB>-FKNUM = 1.
<VFKNVB>-FKPOS = 1.
<VFKNVB>-LFNKN = 1.
<VFKNVB>-AEDAT = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_VFKNVB-NOACT, sy-vline,
  WA_VFKNVB-KFLAG, sy-vline,
  WA_VFKNVB-NETWR, sy-vline,
  WA_VFKNVB-RETYP, sy-vline,
  WA_VFKNVB-REBEL, sy-vline,
  WA_VFKNVB-REPOS, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_VFKNVB 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_VFKNVB 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_VFKNVB INTO WA_VFKNVB.


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

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

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

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

*Conversion exit ABPSP, internal->external for field PROJNR
CALL FUNCTION 'CONVERSION_EXIT_ABPSP_OUTPUT'
  EXPORTING
    input =                      WA_VFKNVB-PROJNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_VFKNVB-PROJNR.
WRITE:/ 'New Value:', ld_input.

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

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

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

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

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

*Conversion exit ABPSP, internal->external for field PS_PSP_PNR
CALL FUNCTION 'CONVERSION_EXIT_ABPSP_OUTPUT'
  EXPORTING
    input =                      WA_VFKNVB-PS_PSP_PNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_VFKNVB-PS_PSP_PNR.
WRITE:/ 'New Value:', ld_input.

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

*Conversion exit NUMCV, internal->external for field VORNR
CALL FUNCTION 'CONVERSION_EXIT_NUMCV_OUTPUT'
  EXPORTING
    input =                      WA_VFKNVB-VORNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_VFKNVB-VORNR.
WRITE:/ 'New Value:', ld_input.

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

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

*Conversion exit FMCIS, internal->external for field FIPOS
CALL FUNCTION 'CONVERSION_EXIT_FMCIS_OUTPUT'
  EXPORTING
    input =                      WA_VFKNVB-FIPOS
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_VFKNVB-FIPOS.
WRITE:/ 'New Value:', ld_input.

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

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

*Conversion exit ALPHA, internal->external for field PRZNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_VFKNVB-PRZNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_VFKNVB-PRZNR.
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_VFKNVB_STR, 
MANDT TYPE STRING,
FKNUM TYPE STRING,
FKPOS TYPE STRING,
LFNKN TYPE STRING,
AEDAT TYPE STRING,
NOACT TYPE STRING,
KFLAG TYPE STRING,
NETWR TYPE STRING,
RETYP TYPE STRING,
REBEL TYPE STRING,
REPOS TYPE STRING,
SAKTO TYPE STRING,
GSBER TYPE STRING,
KOSTL TYPE STRING,
PROJNR TYPE STRING,
VBELN TYPE STRING,
VBELP TYPE STRING,
ANLN1 TYPE STRING,
ANLN2 TYPE STRING,
AUFNR TYPE STRING,
KOKRS TYPE STRING,
KSTRG TYPE STRING,
PAOBJNR TYPE STRING,
PRCTR TYPE STRING,
PS_PSP_PNR TYPE STRING,
NPLNR TYPE STRING,
VORNR TYPE STRING,
AUFPL TYPE STRING,
IMKEY TYPE STRING,
APLZL TYPE STRING,
VPTNR TYPE STRING,
FIPOS TYPE STRING,
RECID TYPE STRING,
FISTL TYPE STRING,
GEBER TYPE STRING,
FKBER TYPE STRING,
WERKS TYPE STRING,
GRANT_NBR TYPE STRING,
DABRZ TYPE STRING,
LSTAR TYPE STRING,
PRZNR TYPE STRING,
BUDGET_PD TYPE STRING,
UPDKZ TYPE STRING,
VIM_MARKED TYPE STRING,
ACCT_CHECK TYPE STRING,END OF T_EKKO_STR.
DATA: WA_VFKNVB_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_VFKNVB_STR-MANDT sy-vline 
WA_VFKNVB_STR-FKNUM sy-vline 
WA_VFKNVB_STR-FKPOS sy-vline 
WA_VFKNVB_STR-LFNKN sy-vline 
WA_VFKNVB_STR-AEDAT sy-vline 
WA_VFKNVB_STR-NOACT sy-vline 
WA_VFKNVB_STR-KFLAG sy-vline 
WA_VFKNVB_STR-NETWR sy-vline 
WA_VFKNVB_STR-RETYP sy-vline 
WA_VFKNVB_STR-REBEL sy-vline 
WA_VFKNVB_STR-REPOS sy-vline 
WA_VFKNVB_STR-SAKTO sy-vline 
WA_VFKNVB_STR-GSBER sy-vline 
WA_VFKNVB_STR-KOSTL sy-vline 
WA_VFKNVB_STR-PROJNR sy-vline 
WA_VFKNVB_STR-VBELN sy-vline 
WA_VFKNVB_STR-VBELP sy-vline 
WA_VFKNVB_STR-ANLN1 sy-vline 
WA_VFKNVB_STR-ANLN2 sy-vline 
WA_VFKNVB_STR-AUFNR sy-vline 
WA_VFKNVB_STR-KOKRS sy-vline 
WA_VFKNVB_STR-KSTRG sy-vline 
WA_VFKNVB_STR-PAOBJNR sy-vline 
WA_VFKNVB_STR-PRCTR sy-vline 
WA_VFKNVB_STR-PS_PSP_PNR sy-vline 
WA_VFKNVB_STR-NPLNR sy-vline 
WA_VFKNVB_STR-VORNR sy-vline 
WA_VFKNVB_STR-AUFPL sy-vline 
WA_VFKNVB_STR-IMKEY sy-vline 
WA_VFKNVB_STR-APLZL sy-vline 
WA_VFKNVB_STR-VPTNR sy-vline 
WA_VFKNVB_STR-FIPOS sy-vline 
WA_VFKNVB_STR-RECID sy-vline 
WA_VFKNVB_STR-FISTL sy-vline 
WA_VFKNVB_STR-GEBER sy-vline 
WA_VFKNVB_STR-FKBER sy-vline 
WA_VFKNVB_STR-WERKS sy-vline 
WA_VFKNVB_STR-GRANT_NBR sy-vline 
WA_VFKNVB_STR-DABRZ sy-vline 
WA_VFKNVB_STR-LSTAR sy-vline 
WA_VFKNVB_STR-PRZNR sy-vline 
WA_VFKNVB_STR-BUDGET_PD sy-vline 
WA_VFKNVB_STR-UPDKZ sy-vline 
WA_VFKNVB_STR-VIM_MARKED sy-vline 
WA_VFKNVB_STR-ACCT_CHECK sy-vline      INTO ld_text SEPARATED BY SPACE.

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