ABAP Select data from SAP table WKALK into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM WKALK
*  INTO TABLE @DATA(IT_WKALK2).
*--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_WKALK INDEX 1 INTO DATA(WA_WKALK2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<WKALK>-VKORG = 1.
<WKALK>-VTWEG = 1.
<WKALK>-WERKS = 1.
<WKALK>-BGINT = 1.
<WKALK>-PLTYP = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_WKALK-EKORG, sy-vline,
  WA_WKALK-MATKL, sy-vline,
  WA_WKALK-MATNR, sy-vline,
  WA_WKALK-VRKPE, sy-vline,
  WA_WKALK-VRKME, sy-vline,
  WA_WKALK-VKKAB, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_WKALK 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_WKALK 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_WKALK INTO WA_WKALK.


*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 MATN1, internal->external for field MATNR
CALL FUNCTION 'CONVERSION_EXIT_MATN1_OUTPUT'
  EXPORTING
    input =                      WA_WKALK-MATNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_WKALK-MATNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit CUNIT, internal->external for field VRKME
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_WKALK-VRKME
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_WKALK-VRKME.
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_WKALK_STR, 
VKORG TYPE STRING,
VTWEG TYPE STRING,
WERKS TYPE STRING,
BGINT TYPE STRING,
PLTYP TYPE STRING,
EKORG TYPE STRING,
MATKL TYPE STRING,
MATNR TYPE STRING,
VRKPE TYPE STRING,
VRKME TYPE STRING,
VKKAB TYPE STRING,
VKKBI TYPE STRING,
VKKAM TYPE STRING,
HWAER TYPE STRING,
HIANZ TYPE STRING,
NOHIP TYPE STRING,END OF T_EKKO_STR.
DATA: WA_WKALK_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_WKALK_STR-VKORG sy-vline 
WA_WKALK_STR-VTWEG sy-vline 
WA_WKALK_STR-WERKS sy-vline 
WA_WKALK_STR-BGINT sy-vline 
WA_WKALK_STR-PLTYP sy-vline 
WA_WKALK_STR-EKORG sy-vline 
WA_WKALK_STR-MATKL sy-vline 
WA_WKALK_STR-MATNR sy-vline 
WA_WKALK_STR-VRKPE sy-vline 
WA_WKALK_STR-VRKME sy-vline 
WA_WKALK_STR-VKKAB sy-vline 
WA_WKALK_STR-VKKBI sy-vline 
WA_WKALK_STR-VKKAM sy-vline 
WA_WKALK_STR-HWAER sy-vline 
WA_WKALK_STR-HIANZ sy-vline 
WA_WKALK_STR-NOHIP sy-vline      INTO ld_text SEPARATED BY SPACE.

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