ABAP Select data from SAP table KNVK into internal table

Get Example source ABAP code based on a different SAP table
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Below is a number of ABAP code snippets to demonstrate how to select data from SAP KNVK 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 KNVK. 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 KNVK 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_KNVK TYPE STANDARD TABLE OF KNVK,
      WA_KNVK TYPE KNVK,
      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: <KNVK> TYPE KNVK.

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM KNVK
*  INTO TABLE @DATA(IT_KNVK2).
*--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_KNVK INDEX 1 INTO DATA(WA_KNVK2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<KNVK>-MANDT = 1.
<KNVK>-PARNR = 1.
<KNVK>-KUNNR = 1.
<KNVK>-NAMEV = 1.
<KNVK>-NAME1 = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_KNVK-ORT01, sy-vline,
  WA_KNVK-ADRND, sy-vline,
  WA_KNVK-ADRNP, sy-vline,
  WA_KNVK-ABTPA, sy-vline,
  WA_KNVK-ABTNR, sy-vline,
  WA_KNVK-UEPAR, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_KNVK 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_KNVK 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_KNVK INTO WA_KNVK.


*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_KNVK-KUNNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_KNVK-KUNNR.
WRITE:/ 'New Value:', ld_input.

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

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

*Conversion exit ISOLA, internal->external for field PARLA
CALL FUNCTION 'CONVERSION_EXIT_ISOLA_OUTPUT'
  EXPORTING
    input =                      WA_KNVK-PARLA
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_KNVK-PARLA.
WRITE:/ 'New Value:', ld_input.

*Conversion exit PDATE, internal->external for field GBDAT
CALL FUNCTION 'CONVERSION_EXIT_PDATE_OUTPUT'
  EXPORTING
    input =                      WA_KNVK-GBDAT
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_KNVK-GBDAT.
WRITE:/ 'New Value:', ld_input.

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

*Conversion exit ALPHA, internal->external for field ADRNP_2
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_KNVK-ADRNP_2
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_KNVK-ADRNP_2.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field PRSNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_KNVK-PRSNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_KNVK-PRSNR.
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_KNVK_STR, 
MANDT TYPE STRING,
PARNR TYPE STRING,
KUNNR TYPE STRING,
NAMEV TYPE STRING,
NAME1 TYPE STRING,
ORT01 TYPE STRING,
ADRND TYPE STRING,
ADRNP TYPE STRING,
ABTPA TYPE STRING,
ABTNR TYPE STRING,
UEPAR TYPE STRING,
TELF1 TYPE STRING,
ANRED TYPE STRING,
PAFKT TYPE STRING,
PARVO TYPE STRING,
PAVIP TYPE STRING,
PARGE TYPE STRING,
PARLA TYPE STRING,
GBDAT TYPE STRING,
VRTNR TYPE STRING,
BRYTH TYPE STRING,
AKVER TYPE STRING,
NMAIL TYPE STRING,
PARAU TYPE STRING,
PARH1 TYPE STRING,
PARH2 TYPE STRING,
PARH3 TYPE STRING,
PARH4 TYPE STRING,
PARH5 TYPE STRING,
MOAB1 TYPE STRING,
MOBI1 TYPE STRING,
MOAB2 TYPE STRING,
MOBI2 TYPE STRING,
DIAB1 TYPE STRING,
DIBI1 TYPE STRING,
DIAB2 TYPE STRING,
DIBI2 TYPE STRING,
MIAB1 TYPE STRING,
MIBI1 TYPE STRING,
MIAB2 TYPE STRING,
MIBI2 TYPE STRING,
DOAB1 TYPE STRING,
DOBI1 TYPE STRING,
DOAB2 TYPE STRING,
DOBI2 TYPE STRING,
FRAB1 TYPE STRING,
FRBI1 TYPE STRING,
FRAB2 TYPE STRING,
FRBI2 TYPE STRING,
SAAB1 TYPE STRING,
SABI1 TYPE STRING,
SAAB2 TYPE STRING,
SABI2 TYPE STRING,
SOAB1 TYPE STRING,
SOBI1 TYPE STRING,
SOAB2 TYPE STRING,
SOBI2 TYPE STRING,
PAKN1 TYPE STRING,
PAKN2 TYPE STRING,
PAKN3 TYPE STRING,
PAKN4 TYPE STRING,
PAKN5 TYPE STRING,
SORTL TYPE STRING,
FAMST TYPE STRING,
SPNAM TYPE STRING,
TITEL_AP TYPE STRING,
ERDAT TYPE STRING,
ERNAM TYPE STRING,
DUEFL TYPE STRING,
LIFNR TYPE STRING,
LOEVM TYPE STRING,
KZHERK TYPE STRING,
ADRNP_2 TYPE STRING,
PRSNR TYPE STRING,
CVP_XBLCK_K TYPE STRING,END OF T_EKKO_STR.
DATA: WA_KNVK_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_KNVK_STR-MANDT sy-vline 
WA_KNVK_STR-PARNR sy-vline 
WA_KNVK_STR-KUNNR sy-vline 
WA_KNVK_STR-NAMEV sy-vline 
WA_KNVK_STR-NAME1 sy-vline 
WA_KNVK_STR-ORT01 sy-vline 
WA_KNVK_STR-ADRND sy-vline 
WA_KNVK_STR-ADRNP sy-vline 
WA_KNVK_STR-ABTPA sy-vline 
WA_KNVK_STR-ABTNR sy-vline 
WA_KNVK_STR-UEPAR sy-vline 
WA_KNVK_STR-TELF1 sy-vline 
WA_KNVK_STR-ANRED sy-vline 
WA_KNVK_STR-PAFKT sy-vline 
WA_KNVK_STR-PARVO sy-vline 
WA_KNVK_STR-PAVIP sy-vline 
WA_KNVK_STR-PARGE sy-vline 
WA_KNVK_STR-PARLA sy-vline 
WA_KNVK_STR-GBDAT sy-vline 
WA_KNVK_STR-VRTNR sy-vline 
WA_KNVK_STR-BRYTH sy-vline 
WA_KNVK_STR-AKVER sy-vline 
WA_KNVK_STR-NMAIL sy-vline 
WA_KNVK_STR-PARAU sy-vline 
WA_KNVK_STR-PARH1 sy-vline 
WA_KNVK_STR-PARH2 sy-vline 
WA_KNVK_STR-PARH3 sy-vline 
WA_KNVK_STR-PARH4 sy-vline 
WA_KNVK_STR-PARH5 sy-vline 
WA_KNVK_STR-MOAB1 sy-vline 
WA_KNVK_STR-MOBI1 sy-vline 
WA_KNVK_STR-MOAB2 sy-vline 
WA_KNVK_STR-MOBI2 sy-vline 
WA_KNVK_STR-DIAB1 sy-vline 
WA_KNVK_STR-DIBI1 sy-vline 
WA_KNVK_STR-DIAB2 sy-vline 
WA_KNVK_STR-DIBI2 sy-vline 
WA_KNVK_STR-MIAB1 sy-vline 
WA_KNVK_STR-MIBI1 sy-vline 
WA_KNVK_STR-MIAB2 sy-vline 
WA_KNVK_STR-MIBI2 sy-vline 
WA_KNVK_STR-DOAB1 sy-vline 
WA_KNVK_STR-DOBI1 sy-vline 
WA_KNVK_STR-DOAB2 sy-vline 
WA_KNVK_STR-DOBI2 sy-vline 
WA_KNVK_STR-FRAB1 sy-vline 
WA_KNVK_STR-FRBI1 sy-vline 
WA_KNVK_STR-FRAB2 sy-vline 
WA_KNVK_STR-FRBI2 sy-vline 
WA_KNVK_STR-SAAB1 sy-vline 
WA_KNVK_STR-SABI1 sy-vline 
WA_KNVK_STR-SAAB2 sy-vline 
WA_KNVK_STR-SABI2 sy-vline 
WA_KNVK_STR-SOAB1 sy-vline 
WA_KNVK_STR-SOBI1 sy-vline 
WA_KNVK_STR-SOAB2 sy-vline 
WA_KNVK_STR-SOBI2 sy-vline 
WA_KNVK_STR-PAKN1 sy-vline 
WA_KNVK_STR-PAKN2 sy-vline 
WA_KNVK_STR-PAKN3 sy-vline 
WA_KNVK_STR-PAKN4 sy-vline 
WA_KNVK_STR-PAKN5 sy-vline 
WA_KNVK_STR-SORTL sy-vline 
WA_KNVK_STR-FAMST sy-vline 
WA_KNVK_STR-SPNAM sy-vline 
WA_KNVK_STR-TITEL_AP sy-vline 
WA_KNVK_STR-ERDAT sy-vline 
WA_KNVK_STR-ERNAM sy-vline 
WA_KNVK_STR-DUEFL sy-vline 
WA_KNVK_STR-LIFNR sy-vline 
WA_KNVK_STR-LOEVM sy-vline 
WA_KNVK_STR-KZHERK sy-vline 
WA_KNVK_STR-ADRNP_2 sy-vline 
WA_KNVK_STR-PRSNR sy-vline 
WA_KNVK_STR-CVP_XBLCK_K sy-vline      INTO ld_text SEPARATED BY SPACE.

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