ABAP Select data from SAP table WLF_TXW_KONV into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM WLF_TXW_KONV
*  INTO TABLE @DATA(IT_WLF_TXW_KONV2).
*--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_WLF_TXW_KONV INDEX 1 INTO DATA(WA_WLF_TXW_KONV2).


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

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

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_WLF_TXW_KONV-KAPPL, sy-vline,
  WA_WLF_TXW_KONV-KSCHL, sy-vline,
  WA_WLF_TXW_KONV-KDATU, sy-vline,
  WA_WLF_TXW_KONV-KRECH, sy-vline,
  WA_WLF_TXW_KONV-KAWRT, sy-vline,
  WA_WLF_TXW_KONV-KBETR, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_WLF_TXW_KONV 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_WLF_TXW_KONV 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_WLF_TXW_KONV INTO WA_WLF_TXW_KONV.


*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_WLF_TXW_KONV-KMEIN
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_WLF_TXW_KONV-KMEIN.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field SAKN1
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_WLF_TXW_KONV-SAKN1
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_WLF_TXW_KONV-SAKN1.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field SAKN2
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_WLF_TXW_KONV-SAKN2
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_WLF_TXW_KONV-SAKN2.
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_WLF_TXW_KONV_STR, 
MANDT TYPE STRING,
KNUMV TYPE STRING,
KPOSN TYPE STRING,
STUNR TYPE STRING,
ZAEHK TYPE STRING,
KAPPL TYPE STRING,
KSCHL TYPE STRING,
KDATU TYPE STRING,
KRECH TYPE STRING,
KAWRT TYPE STRING,
KBETR TYPE STRING,
WAERS TYPE STRING,
KKURS TYPE STRING,
KPEIN TYPE STRING,
KMEIN TYPE STRING,
KNTYP TYPE STRING,
KSTAT TYPE STRING,
KNUMH TYPE STRING,
KOPOS TYPE STRING,
SAKN1 TYPE STRING,
MWSK1 TYPE STRING,
SAKN2 TYPE STRING,
MWSK2 TYPE STRING,
KWERT TYPE STRING,
KINAK TYPE STRING,
KOAID TYPE STRING,END OF T_EKKO_STR.
DATA: WA_WLF_TXW_KONV_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_WLF_TXW_KONV_STR-MANDT sy-vline 
WA_WLF_TXW_KONV_STR-KNUMV sy-vline 
WA_WLF_TXW_KONV_STR-KPOSN sy-vline 
WA_WLF_TXW_KONV_STR-STUNR sy-vline 
WA_WLF_TXW_KONV_STR-ZAEHK sy-vline 
WA_WLF_TXW_KONV_STR-KAPPL sy-vline 
WA_WLF_TXW_KONV_STR-KSCHL sy-vline 
WA_WLF_TXW_KONV_STR-KDATU sy-vline 
WA_WLF_TXW_KONV_STR-KRECH sy-vline 
WA_WLF_TXW_KONV_STR-KAWRT sy-vline 
WA_WLF_TXW_KONV_STR-KBETR sy-vline 
WA_WLF_TXW_KONV_STR-WAERS sy-vline 
WA_WLF_TXW_KONV_STR-KKURS sy-vline 
WA_WLF_TXW_KONV_STR-KPEIN sy-vline 
WA_WLF_TXW_KONV_STR-KMEIN sy-vline 
WA_WLF_TXW_KONV_STR-KNTYP sy-vline 
WA_WLF_TXW_KONV_STR-KSTAT sy-vline 
WA_WLF_TXW_KONV_STR-KNUMH sy-vline 
WA_WLF_TXW_KONV_STR-KOPOS sy-vline 
WA_WLF_TXW_KONV_STR-SAKN1 sy-vline 
WA_WLF_TXW_KONV_STR-MWSK1 sy-vline 
WA_WLF_TXW_KONV_STR-SAKN2 sy-vline 
WA_WLF_TXW_KONV_STR-MWSK2 sy-vline 
WA_WLF_TXW_KONV_STR-KWERT sy-vline 
WA_WLF_TXW_KONV_STR-KINAK sy-vline 
WA_WLF_TXW_KONV_STR-KOAID sy-vline      INTO ld_text SEPARATED BY SPACE.

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