ABAP Select data from SAP table KNVV_ACT into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP KNVV_ACT 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_ACT. 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_ACT 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_ACT TYPE STANDARD TABLE OF KNVV_ACT,
      WA_KNVV_ACT TYPE KNVV_ACT,
      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_ACT> TYPE KNVV_ACT.

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM KNVV_ACT
*  INTO TABLE @DATA(IT_KNVV_ACT2).
*--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_ACT INDEX 1 INTO DATA(WA_KNVV_ACT2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<KNVV_ACT>-MANDT = 1.
<KNVV_ACT>-PARTNER = 1.
<KNVV_ACT>-VKORG = 1.
<KNVV_ACT>-VTWEG = 1.
<KNVV_ACT>-SPART = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_KNVV_ACT-ASSIGNMENT_ID, sy-vline,
  WA_KNVV_ACT-ERNAM, sy-vline,
  WA_KNVV_ACT-ERDAT, sy-vline,
  WA_KNVV_ACT-BEGRU, sy-vline,
  WA_KNVV_ACT-LOEVM, sy-vline,
  WA_KNVV_ACT-VERSG, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_KNVV_ACT 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_ACT 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_ACT INTO WA_KNVV_ACT.


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

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

*Conversion exit TSTRG, internal->external for field PODTG
CALL FUNCTION 'CONVERSION_EXIT_TSTRG_OUTPUT'
  EXPORTING
    input =                      WA_KNVV_ACT-PODTG
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_KNVV_ACT-PODTG.
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_ACT_STR, 
MANDT TYPE STRING,
PARTNER TYPE STRING,
VKORG TYPE STRING,
VTWEG TYPE STRING,
SPART TYPE STRING,
ASSIGNMENT_ID TYPE STRING,
ERNAM TYPE STRING,
ERDAT TYPE STRING,
BEGRU TYPE STRING,
LOEVM TYPE STRING,
VERSG TYPE STRING,
AUFSD TYPE STRING,
KALKS TYPE STRING,
KDGRP TYPE STRING,
BZIRK TYPE STRING,
KONDA TYPE STRING,
PLTYP TYPE STRING,
AWAHR TYPE STRING,
INCO1 TYPE STRING,
INCO2 TYPE STRING,
LIFSD 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 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,
VKGRP TYPE STRING,
VKBUR 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,
KABSS TYPE STRING,
KKBER TYPE STRING,
CASSD TYPE STRING,
RDOFF TYPE STRING,
AGREL TYPE STRING,
MEGRU TYPE STRING,
UEBTO TYPE STRING,
UNTTO TYPE STRING,
UEBTK TYPE STRING,
PVKSM TYPE STRING,
PODKZ TYPE STRING,
PODTG TYPE STRING,
BLIND TYPE STRING,
CARRIER_NOTIF TYPE STRING,
CVP_XBLCK_V TYPE STRING,
RECENCY TYPE STRING,
SOURCE_RECENCY TYPE STRING,
TARGET_ASSIGNMENT_ID TYPE STRING,END OF T_EKKO_STR.
DATA: WA_KNVV_ACT_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_ACT_STR-MANDT sy-vline 
WA_KNVV_ACT_STR-PARTNER sy-vline 
WA_KNVV_ACT_STR-VKORG sy-vline 
WA_KNVV_ACT_STR-VTWEG sy-vline 
WA_KNVV_ACT_STR-SPART sy-vline 
WA_KNVV_ACT_STR-ASSIGNMENT_ID sy-vline 
WA_KNVV_ACT_STR-ERNAM sy-vline 
WA_KNVV_ACT_STR-ERDAT sy-vline 
WA_KNVV_ACT_STR-BEGRU sy-vline 
WA_KNVV_ACT_STR-LOEVM sy-vline 
WA_KNVV_ACT_STR-VERSG sy-vline 
WA_KNVV_ACT_STR-AUFSD sy-vline 
WA_KNVV_ACT_STR-KALKS sy-vline 
WA_KNVV_ACT_STR-KDGRP sy-vline 
WA_KNVV_ACT_STR-BZIRK sy-vline 
WA_KNVV_ACT_STR-KONDA sy-vline 
WA_KNVV_ACT_STR-PLTYP sy-vline 
WA_KNVV_ACT_STR-AWAHR sy-vline 
WA_KNVV_ACT_STR-INCO1 sy-vline 
WA_KNVV_ACT_STR-INCO2 sy-vline 
WA_KNVV_ACT_STR-LIFSD sy-vline 
WA_KNVV_ACT_STR-AUTLF sy-vline 
WA_KNVV_ACT_STR-ANTLF sy-vline 
WA_KNVV_ACT_STR-KZTLF sy-vline 
WA_KNVV_ACT_STR-KZAZU sy-vline 
WA_KNVV_ACT_STR-CHSPL sy-vline 
WA_KNVV_ACT_STR-LPRIO sy-vline 
WA_KNVV_ACT_STR-EIKTO sy-vline 
WA_KNVV_ACT_STR-VSBED sy-vline 
WA_KNVV_ACT_STR-FAKSD sy-vline 
WA_KNVV_ACT_STR-MRNKZ sy-vline 
WA_KNVV_ACT_STR-PERFK sy-vline 
WA_KNVV_ACT_STR-PERRL sy-vline 
WA_KNVV_ACT_STR-KVAKZ sy-vline 
WA_KNVV_ACT_STR-KVAWT sy-vline 
WA_KNVV_ACT_STR-WAERS sy-vline 
WA_KNVV_ACT_STR-KLABC sy-vline 
WA_KNVV_ACT_STR-KTGRD sy-vline 
WA_KNVV_ACT_STR-ZTERM sy-vline 
WA_KNVV_ACT_STR-VWERK sy-vline 
WA_KNVV_ACT_STR-VKGRP sy-vline 
WA_KNVV_ACT_STR-VKBUR sy-vline 
WA_KNVV_ACT_STR-VSORT sy-vline 
WA_KNVV_ACT_STR-KVGR1 sy-vline 
WA_KNVV_ACT_STR-KVGR2 sy-vline 
WA_KNVV_ACT_STR-KVGR3 sy-vline 
WA_KNVV_ACT_STR-KVGR4 sy-vline 
WA_KNVV_ACT_STR-KVGR5 sy-vline 
WA_KNVV_ACT_STR-BOKRE sy-vline 
WA_KNVV_ACT_STR-BOIDT sy-vline 
WA_KNVV_ACT_STR-KURST sy-vline 
WA_KNVV_ACT_STR-PRFRE sy-vline 
WA_KNVV_ACT_STR-PRAT1 sy-vline 
WA_KNVV_ACT_STR-PRAT2 sy-vline 
WA_KNVV_ACT_STR-PRAT3 sy-vline 
WA_KNVV_ACT_STR-PRAT4 sy-vline 
WA_KNVV_ACT_STR-PRAT5 sy-vline 
WA_KNVV_ACT_STR-PRAT6 sy-vline 
WA_KNVV_ACT_STR-PRAT7 sy-vline 
WA_KNVV_ACT_STR-PRAT8 sy-vline 
WA_KNVV_ACT_STR-PRAT9 sy-vline 
WA_KNVV_ACT_STR-PRATA sy-vline 
WA_KNVV_ACT_STR-KABSS sy-vline 
WA_KNVV_ACT_STR-KKBER sy-vline 
WA_KNVV_ACT_STR-CASSD sy-vline 
WA_KNVV_ACT_STR-RDOFF sy-vline 
WA_KNVV_ACT_STR-AGREL sy-vline 
WA_KNVV_ACT_STR-MEGRU sy-vline 
WA_KNVV_ACT_STR-UEBTO sy-vline 
WA_KNVV_ACT_STR-UNTTO sy-vline 
WA_KNVV_ACT_STR-UEBTK sy-vline 
WA_KNVV_ACT_STR-PVKSM sy-vline 
WA_KNVV_ACT_STR-PODKZ sy-vline 
WA_KNVV_ACT_STR-PODTG sy-vline 
WA_KNVV_ACT_STR-BLIND sy-vline 
WA_KNVV_ACT_STR-CARRIER_NOTIF sy-vline 
WA_KNVV_ACT_STR-CVP_XBLCK_V sy-vline 
WA_KNVV_ACT_STR-RECENCY sy-vline 
WA_KNVV_ACT_STR-SOURCE_RECENCY sy-vline 
WA_KNVV_ACT_STR-TARGET_ASSIGNMENT_ID sy-vline      INTO ld_text SEPARATED BY SPACE.

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