ABAP Select data from SAP table VZKNB1 into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP VZKNB1 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 VZKNB1. 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 VZKNB1 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_VZKNB1 TYPE STANDARD TABLE OF VZKNB1,
      WA_VZKNB1 TYPE VZKNB1,
      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: <VZKNB1> TYPE VZKNB1.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_VZKNB1.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM VZKNB1
  INTO TABLE IT_VZKNB1.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM VZKNB1
*  INTO TABLE @DATA(IT_VZKNB12).
*--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_VZKNB1 INDEX 1 INTO DATA(WA_VZKNB12).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_VZKNB1 ASSIGNING <VZKNB1>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<VZKNB1>-MANDT = 1.
<VZKNB1>-KUNNR = 1.
<VZKNB1>-BUKRS = 1.
<VZKNB1>-ZUAWA = 1.
<VZKNB1>-BUSAB = 1.

ENDLOOP.

LOOP AT IT_VZKNB1 INTO WA_VZKNB1.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_VZKNB1-AKONT, sy-vline,
  WA_VZKNB1-BEGRU, sy-vline,
  WA_VZKNB1-KNRZE, sy-vline,
  WA_VZKNB1-KNRZB, sy-vline,
  WA_VZKNB1-ZAMIM, sy-vline,
  WA_VZKNB1-ZAMIV, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_VZKNB1 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_VZKNB1 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_VZKNB1 INTO WA_VZKNB1.


*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_VZKNB1-KUNNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_VZKNB1-KUNNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field AKONT
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_VZKNB1-AKONT
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_VZKNB1-AKONT.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field KNRZE
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_VZKNB1-KNRZE
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_VZKNB1-KNRZE.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field KNRZB
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_VZKNB1-KNRZB
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_VZKNB1-KNRZB.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field FDGRV
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_VZKNB1-FDGRV
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_VZKNB1-FDGRV.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field REMIT
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_VZKNB1-REMIT
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_VZKNB1-REMIT.
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_VZKNB1_STR, 
MANDT TYPE STRING,
KUNNR TYPE STRING,
BUKRS TYPE STRING,
ZUAWA TYPE STRING,
BUSAB TYPE STRING,
AKONT TYPE STRING,
BEGRU TYPE STRING,
KNRZE TYPE STRING,
KNRZB TYPE STRING,
ZAMIM TYPE STRING,
ZAMIV TYPE STRING,
ZAMIR TYPE STRING,
ZAMIB TYPE STRING,
ZAMIO TYPE STRING,
ZWELS TYPE STRING,
XVERR TYPE STRING,
ZAHLS TYPE STRING,
ZTERM TYPE STRING,
WAKON TYPE STRING,
VZSKZ TYPE STRING,
ZINDT TYPE STRING,
ZINRT TYPE STRING,
EIKTO TYPE STRING,
ZSABE TYPE STRING,
KVERM TYPE STRING,
FDGRV TYPE STRING,
PERKZ TYPE STRING,
XDEZV TYPE STRING,
XAUSZ TYPE STRING,
WEBTR TYPE STRING,
REMIT TYPE STRING,
DATLZ TYPE STRING,
XZVER TYPE STRING,
TOGRU TYPE STRING,
KULTG TYPE STRING,
HBKID TYPE STRING,
XPORE TYPE STRING,
BLNKZ TYPE STRING,
ALTKN TYPE STRING,
ZGRUP TYPE STRING,
LOEVM TYPE STRING,
SPERR TYPE STRING,
MGRUP TYPE STRING,
URLID TYPE STRING,END OF T_EKKO_STR.
DATA: WA_VZKNB1_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_VZKNB1_STR-MANDT sy-vline 
WA_VZKNB1_STR-KUNNR sy-vline 
WA_VZKNB1_STR-BUKRS sy-vline 
WA_VZKNB1_STR-ZUAWA sy-vline 
WA_VZKNB1_STR-BUSAB sy-vline 
WA_VZKNB1_STR-AKONT sy-vline 
WA_VZKNB1_STR-BEGRU sy-vline 
WA_VZKNB1_STR-KNRZE sy-vline 
WA_VZKNB1_STR-KNRZB sy-vline 
WA_VZKNB1_STR-ZAMIM sy-vline 
WA_VZKNB1_STR-ZAMIV sy-vline 
WA_VZKNB1_STR-ZAMIR sy-vline 
WA_VZKNB1_STR-ZAMIB sy-vline 
WA_VZKNB1_STR-ZAMIO sy-vline 
WA_VZKNB1_STR-ZWELS sy-vline 
WA_VZKNB1_STR-XVERR sy-vline 
WA_VZKNB1_STR-ZAHLS sy-vline 
WA_VZKNB1_STR-ZTERM sy-vline 
WA_VZKNB1_STR-WAKON sy-vline 
WA_VZKNB1_STR-VZSKZ sy-vline 
WA_VZKNB1_STR-ZINDT sy-vline 
WA_VZKNB1_STR-ZINRT sy-vline 
WA_VZKNB1_STR-EIKTO sy-vline 
WA_VZKNB1_STR-ZSABE sy-vline 
WA_VZKNB1_STR-KVERM sy-vline 
WA_VZKNB1_STR-FDGRV sy-vline 
WA_VZKNB1_STR-PERKZ sy-vline 
WA_VZKNB1_STR-XDEZV sy-vline 
WA_VZKNB1_STR-XAUSZ sy-vline 
WA_VZKNB1_STR-WEBTR sy-vline 
WA_VZKNB1_STR-REMIT sy-vline 
WA_VZKNB1_STR-DATLZ sy-vline 
WA_VZKNB1_STR-XZVER sy-vline 
WA_VZKNB1_STR-TOGRU sy-vline 
WA_VZKNB1_STR-KULTG sy-vline 
WA_VZKNB1_STR-HBKID sy-vline 
WA_VZKNB1_STR-XPORE sy-vline 
WA_VZKNB1_STR-BLNKZ sy-vline 
WA_VZKNB1_STR-ALTKN sy-vline 
WA_VZKNB1_STR-ZGRUP sy-vline 
WA_VZKNB1_STR-LOEVM sy-vline 
WA_VZKNB1_STR-SPERR sy-vline 
WA_VZKNB1_STR-MGRUP sy-vline 
WA_VZKNB1_STR-URLID sy-vline      INTO ld_text SEPARATED BY SPACE.

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