ABAP Select data from SAP table WTY_KONVC into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM WTY_KONVC
*  INTO TABLE @DATA(IT_WTY_KONVC2).
*--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_WTY_KONVC INDEX 1 INTO DATA(WA_WTY_KONVC2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<WTY_KONVC>-KNUMV = 1.
<WTY_KONVC>-KPOSN = 1.
<WTY_KONVC>-STUNR = 1.
<WTY_KONVC>-ZAEHK = 1.
<WTY_KONVC>-KSCHL = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_WTY_KONVC-KBETR, sy-vline,
  WA_WTY_KONVC-WAERS, sy-vline,
  WA_WTY_KONVC-KPEIN, sy-vline,
  WA_WTY_KONVC-KMEIN, sy-vline,
  WA_WTY_KONVC-PVGUID, sy-vline,
ENDLOOP.
   
*Add any further fields from structure WA_WTY_KONVC 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_WTY_KONVC 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_WTY_KONVC INTO WA_WTY_KONVC.


*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 CUNIT, internal->external for field KMEIN
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_WTY_KONVC-KMEIN
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_WTY_KONVC-KMEIN.
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_WTY_KONVC_STR, 
KNUMV TYPE STRING,
KPOSN TYPE STRING,
STUNR TYPE STRING,
ZAEHK TYPE STRING,
KSCHL TYPE STRING,
KBETR TYPE STRING,
WAERS TYPE STRING,
KPEIN TYPE STRING,
KMEIN TYPE STRING,
PVGUID TYPE STRING,END OF T_EKKO_STR.
DATA: WA_WTY_KONVC_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_WTY_KONVC_STR-KNUMV sy-vline 
WA_WTY_KONVC_STR-KPOSN sy-vline 
WA_WTY_KONVC_STR-STUNR sy-vline 
WA_WTY_KONVC_STR-ZAEHK sy-vline 
WA_WTY_KONVC_STR-KSCHL sy-vline 
WA_WTY_KONVC_STR-KBETR sy-vline 
WA_WTY_KONVC_STR-WAERS sy-vline 
WA_WTY_KONVC_STR-KPEIN sy-vline 
WA_WTY_KONVC_STR-KMEIN sy-vline 
WA_WTY_KONVC_STR-PVGUID sy-vline      INTO ld_text SEPARATED BY SPACE.

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