ABAP Select data from SAP table VZKNBK into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM VZKNBK
*  INTO TABLE @DATA(IT_VZKNBK2).
*--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_VZKNBK INDEX 1 INTO DATA(WA_VZKNBK2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<VZKNBK>-MANDT = 1.
<VZKNBK>-KUNNR = 1.
<VZKNBK>-BANKS = 1.
<VZKNBK>-BANKL = 1.
<VZKNBK>-BANKN = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_VZKNBK-XDELE, sy-vline,
  WA_VZKNBK-BKONT, sy-vline,
  WA_VZKNBK-BVTYP, sy-vline,
  WA_VZKNBK-XEZER, sy-vline,
  WA_VZKNBK-BANKA, sy-vline,
  WA_VZKNBK-PROVZ, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_VZKNBK 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_VZKNBK 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_VZKNBK INTO WA_VZKNBK.


*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_VZKNBK-KUNNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_VZKNBK-KUNNR.
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_VZKNBK_STR, 
MANDT TYPE STRING,
KUNNR TYPE STRING,
BANKS TYPE STRING,
BANKL TYPE STRING,
BANKN TYPE STRING,
XDELE TYPE STRING,
BKONT TYPE STRING,
BVTYP TYPE STRING,
XEZER TYPE STRING,
BANKA TYPE STRING,
PROVZ TYPE STRING,
STRAS TYPE STRING,
ORT01 TYPE STRING,
SWIFT TYPE STRING,
BGRUP TYPE STRING,
XPGRO TYPE STRING,
BNKLZ TYPE STRING,END OF T_EKKO_STR.
DATA: WA_VZKNBK_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_VZKNBK_STR-MANDT sy-vline 
WA_VZKNBK_STR-KUNNR sy-vline 
WA_VZKNBK_STR-BANKS sy-vline 
WA_VZKNBK_STR-BANKL sy-vline 
WA_VZKNBK_STR-BANKN sy-vline 
WA_VZKNBK_STR-XDELE sy-vline 
WA_VZKNBK_STR-BKONT sy-vline 
WA_VZKNBK_STR-BVTYP sy-vline 
WA_VZKNBK_STR-XEZER sy-vline 
WA_VZKNBK_STR-BANKA sy-vline 
WA_VZKNBK_STR-PROVZ sy-vline 
WA_VZKNBK_STR-STRAS sy-vline 
WA_VZKNBK_STR-ORT01 sy-vline 
WA_VZKNBK_STR-SWIFT sy-vline 
WA_VZKNBK_STR-BGRUP sy-vline 
WA_VZKNBK_STR-XPGRO sy-vline 
WA_VZKNBK_STR-BNKLZ sy-vline      INTO ld_text SEPARATED BY SPACE.

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