ABAP Select data from SAP table KNVV_LISTE into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM KNVV_LISTE
*  INTO TABLE @DATA(IT_KNVV_LISTE2).
*--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_KNVV_LISTE INDEX 1 INTO DATA(WA_KNVV_LISTE2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<KNVV_LISTE>-AUFSD_KNVV = 1.
<KNVV_LISTE>-KDGRP = 1.
<KNVV_LISTE>-BZIRK = 1.
<KNVV_LISTE>-PLTYP = 1.
<KNVV_LISTE>-AWAHR = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_KNVV_LISTE-INCO1, sy-vline,
  WA_KNVV_LISTE-INCO2, sy-vline,
  WA_KNVV_LISTE-LIFSD_KNVV, sy-vline,
  WA_KNVV_LISTE-AUTLF, sy-vline,
  WA_KNVV_LISTE-ANTLF, sy-vline,
  WA_KNVV_LISTE-KZTLF, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_KNVV_LISTE 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_KNVV_LISTE 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_KNVV_LISTE INTO WA_KNVV_LISTE.


*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 VSORT
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_KNVV_LISTE-VSORT
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_KNVV_LISTE-VSORT.
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_KNVV_LISTE_STR, 
AUFSD_KNVV TYPE STRING,
KDGRP TYPE STRING,
BZIRK TYPE STRING,
PLTYP TYPE STRING,
AWAHR TYPE STRING,
INCO1 TYPE STRING,
INCO2 TYPE STRING,
LIFSD_KNVV TYPE STRING,
AUTLF TYPE STRING,
ANTLF TYPE STRING,
KZTLF TYPE STRING,
KZAZU TYPE STRING,
CHSPL TYPE STRING,
LPRIO TYPE STRING,
EIKTO TYPE STRING,
VSBED TYPE STRING,
FAKSD_KNVV TYPE STRING,
MRNKZ TYPE STRING,
PERFK TYPE STRING,
PERRL TYPE STRING,
KVAKZ TYPE STRING,
KVAWT TYPE STRING,
WAERS TYPE STRING,
KLABC TYPE STRING,
KTGRD TYPE STRING,
ZTERM TYPE STRING,
VWERK TYPE STRING,
VSORT TYPE STRING,
KVGR1 TYPE STRING,
KVGR2 TYPE STRING,
KVGR3 TYPE STRING,
KVGR4 TYPE STRING,
KVGR5 TYPE STRING,
BOKRE TYPE STRING,
BOIDT TYPE STRING,
KURST TYPE STRING,
PRFRE TYPE STRING,
PRAT1 TYPE STRING,
PRAT2 TYPE STRING,
PRAT3 TYPE STRING,
PRAT4 TYPE STRING,
PRAT5 TYPE STRING,
PRAT6 TYPE STRING,
PRAT7 TYPE STRING,
PRAT8 TYPE STRING,
PRAT9 TYPE STRING,
PRATA TYPE STRING,END OF T_EKKO_STR.
DATA: WA_KNVV_LISTE_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_KNVV_LISTE_STR-AUFSD_KNVV sy-vline 
WA_KNVV_LISTE_STR-KDGRP sy-vline 
WA_KNVV_LISTE_STR-BZIRK sy-vline 
WA_KNVV_LISTE_STR-PLTYP sy-vline 
WA_KNVV_LISTE_STR-AWAHR sy-vline 
WA_KNVV_LISTE_STR-INCO1 sy-vline 
WA_KNVV_LISTE_STR-INCO2 sy-vline 
WA_KNVV_LISTE_STR-LIFSD_KNVV sy-vline 
WA_KNVV_LISTE_STR-AUTLF sy-vline 
WA_KNVV_LISTE_STR-ANTLF sy-vline 
WA_KNVV_LISTE_STR-KZTLF sy-vline 
WA_KNVV_LISTE_STR-KZAZU sy-vline 
WA_KNVV_LISTE_STR-CHSPL sy-vline 
WA_KNVV_LISTE_STR-LPRIO sy-vline 
WA_KNVV_LISTE_STR-EIKTO sy-vline 
WA_KNVV_LISTE_STR-VSBED sy-vline 
WA_KNVV_LISTE_STR-FAKSD_KNVV sy-vline 
WA_KNVV_LISTE_STR-MRNKZ sy-vline 
WA_KNVV_LISTE_STR-PERFK sy-vline 
WA_KNVV_LISTE_STR-PERRL sy-vline 
WA_KNVV_LISTE_STR-KVAKZ sy-vline 
WA_KNVV_LISTE_STR-KVAWT sy-vline 
WA_KNVV_LISTE_STR-WAERS sy-vline 
WA_KNVV_LISTE_STR-KLABC sy-vline 
WA_KNVV_LISTE_STR-KTGRD sy-vline 
WA_KNVV_LISTE_STR-ZTERM sy-vline 
WA_KNVV_LISTE_STR-VWERK sy-vline 
WA_KNVV_LISTE_STR-VSORT sy-vline 
WA_KNVV_LISTE_STR-KVGR1 sy-vline 
WA_KNVV_LISTE_STR-KVGR2 sy-vline 
WA_KNVV_LISTE_STR-KVGR3 sy-vline 
WA_KNVV_LISTE_STR-KVGR4 sy-vline 
WA_KNVV_LISTE_STR-KVGR5 sy-vline 
WA_KNVV_LISTE_STR-BOKRE sy-vline 
WA_KNVV_LISTE_STR-BOIDT sy-vline 
WA_KNVV_LISTE_STR-KURST sy-vline 
WA_KNVV_LISTE_STR-PRFRE sy-vline 
WA_KNVV_LISTE_STR-PRAT1 sy-vline 
WA_KNVV_LISTE_STR-PRAT2 sy-vline 
WA_KNVV_LISTE_STR-PRAT3 sy-vline 
WA_KNVV_LISTE_STR-PRAT4 sy-vline 
WA_KNVV_LISTE_STR-PRAT5 sy-vline 
WA_KNVV_LISTE_STR-PRAT6 sy-vline 
WA_KNVV_LISTE_STR-PRAT7 sy-vline 
WA_KNVV_LISTE_STR-PRAT8 sy-vline 
WA_KNVV_LISTE_STR-PRAT9 sy-vline 
WA_KNVV_LISTE_STR-PRATA sy-vline      INTO ld_text SEPARATED BY SPACE.

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