ABAP Select data from SAP table VZXKNA1 into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP VZXKNA1 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 VZXKNA1. 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 VZXKNA1 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_VZXKNA1 TYPE STANDARD TABLE OF VZXKNA1,
      WA_VZXKNA1 TYPE VZXKNA1,
      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: <VZXKNA1> TYPE VZXKNA1.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_VZXKNA1.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM VZXKNA1
  INTO TABLE IT_VZXKNA1.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM VZXKNA1
*  INTO TABLE @DATA(IT_VZXKNA12).
*--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_VZXKNA1 INDEX 1 INTO DATA(WA_VZXKNA12).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_VZXKNA1 ASSIGNING <VZXKNA1>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<VZXKNA1>-FISKN = 1.
<VZXKNA1>-KNRZA = 1.
<VZXKNA1>-LIFNR = 1.
<VZXKNA1>-BBBNR = 1.
<VZXKNA1>-BBSNR = 1.

ENDLOOP.

LOOP AT IT_VZXKNA1 INTO WA_VZXKNA1.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_VZXKNA1-BUBKZ, sy-vline,
  WA_VZXKNA1-BEGRU, sy-vline,
  WA_VZXKNA1-BRSCH, sy-vline,
  WA_VZXKNA1-KONZS, sy-vline,
  WA_VZXKNA1-COUNC, sy-vline,
  WA_VZXKNA1-CITYC, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_VZXKNA1 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_VZXKNA1 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_VZXKNA1 INTO WA_VZXKNA1.


*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 FISKN
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_VZXKNA1-FISKN
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_VZXKNA1-FISKN.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field KNRZA
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_VZXKNA1-KNRZA
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_VZXKNA1-KNRZA.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field LIFNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_VZXKNA1-LIFNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_VZXKNA1-LIFNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field VBUND
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_VZXKNA1-VBUND
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_VZXKNA1-VBUND.
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_VZXKNA1_STR, 
FISKN TYPE STRING,
KNRZA TYPE STRING,
LIFNR TYPE STRING,
BBBNR TYPE STRING,
BBSNR TYPE STRING,
BUBKZ TYPE STRING,
BEGRU TYPE STRING,
BRSCH TYPE STRING,
KONZS TYPE STRING,
COUNC TYPE STRING,
CITYC TYPE STRING,
STCD1 TYPE STRING,
STCD2 TYPE STRING,
STKZA TYPE STRING,
STKZU TYPE STRING,
XZEMP TYPE STRING,
VBUND TYPE STRING,
STCEG TYPE STRING,END OF T_EKKO_STR.
DATA: WA_VZXKNA1_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_VZXKNA1_STR-FISKN sy-vline 
WA_VZXKNA1_STR-KNRZA sy-vline 
WA_VZXKNA1_STR-LIFNR sy-vline 
WA_VZXKNA1_STR-BBBNR sy-vline 
WA_VZXKNA1_STR-BBSNR sy-vline 
WA_VZXKNA1_STR-BUBKZ sy-vline 
WA_VZXKNA1_STR-BEGRU sy-vline 
WA_VZXKNA1_STR-BRSCH sy-vline 
WA_VZXKNA1_STR-KONZS sy-vline 
WA_VZXKNA1_STR-COUNC sy-vline 
WA_VZXKNA1_STR-CITYC sy-vline 
WA_VZXKNA1_STR-STCD1 sy-vline 
WA_VZXKNA1_STR-STCD2 sy-vline 
WA_VZXKNA1_STR-STKZA sy-vline 
WA_VZXKNA1_STR-STKZU sy-vline 
WA_VZXKNA1_STR-XZEMP sy-vline 
WA_VZXKNA1_STR-VBUND sy-vline 
WA_VZXKNA1_STR-STCEG sy-vline      INTO ld_text SEPARATED BY SPACE.

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