ABAP Select data from SAP table WLF_IV_HELP_RK into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP WLF_IV_HELP_RK 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_IV_HELP_RK. 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_IV_HELP_RK 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_IV_HELP_RK TYPE STANDARD TABLE OF WLF_IV_HELP_RK,
      WA_WLF_IV_HELP_RK TYPE WLF_IV_HELP_RK,
      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_IV_HELP_RK> TYPE WLF_IV_HELP_RK.

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM WLF_IV_HELP_RK
*  INTO TABLE @DATA(IT_WLF_IV_HELP_RK2).
*--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_IV_HELP_RK INDEX 1 INTO DATA(WA_WLF_IV_HELP_RK2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<WLF_IV_HELP_RK>-STATUS_RK = 1.
<WLF_IV_HELP_RK>-LFART_RK = 1.
<WLF_IV_HELP_RK>-ZFBDT_RK = 1.
<WLF_IV_HELP_RK>-REBZG_RK = 1.
<WLF_IV_HELP_RK>-REBZJ_RK = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_WLF_IV_HELP_RK-REBZZ_RK, sy-vline,
  WA_WLF_IV_HELP_RK-BRTWR_RK, sy-vline,
  WA_WLF_IV_HELP_RK-MWSBK_RK, sy-vline,
  WA_WLF_IV_HELP_RK-BLART_RK, sy-vline,
  WA_WLF_IV_HELP_RK-BKTXT_RK, sy-vline,
  WA_WLF_IV_HELP_RK-WPYCUR_P1_RK, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_WLF_IV_HELP_RK 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_IV_HELP_RK 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_IV_HELP_RK INTO WA_WLF_IV_HELP_RK.


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

*Conversion exit GJAHR, internal->external for field REBZJ_RK
CALL FUNCTION 'CONVERSION_EXIT_GJAHR_OUTPUT'
  EXPORTING
    input =                      WA_WLF_IV_HELP_RK-REBZJ_RK
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_WLF_IV_HELP_RK-REBZJ_RK.
WRITE:/ 'New Value:', ld_input.

*Conversion exit EXCRT, internal->external for field WKURS_P1_RK
CALL FUNCTION 'CONVERSION_EXIT_EXCRT_OUTPUT'
  EXPORTING
    input =                      WA_WLF_IV_HELP_RK-WKURS_P1_RK
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_WLF_IV_HELP_RK-WKURS_P1_RK.
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_IV_HELP_RK_STR, 
STATUS_RK TYPE STRING,
LFART_RK TYPE STRING,
ZFBDT_RK TYPE STRING,
REBZG_RK TYPE STRING,
REBZJ_RK TYPE STRING,
REBZZ_RK TYPE STRING,
BRTWR_RK TYPE STRING,
MWSBK_RK TYPE STRING,
BLART_RK TYPE STRING,
BKTXT_RK TYPE STRING,
WPYCUR_P1_RK TYPE STRING,
WKURS_P1_RK TYPE STRING,
PYAMT_RK TYPE STRING,
ZLSPR_RK TYPE STRING,
BVTYP_RK TYPE STRING,
LFGRU_RK TYPE STRING,END OF T_EKKO_STR.
DATA: WA_WLF_IV_HELP_RK_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_IV_HELP_RK_STR-STATUS_RK sy-vline 
WA_WLF_IV_HELP_RK_STR-LFART_RK sy-vline 
WA_WLF_IV_HELP_RK_STR-ZFBDT_RK sy-vline 
WA_WLF_IV_HELP_RK_STR-REBZG_RK sy-vline 
WA_WLF_IV_HELP_RK_STR-REBZJ_RK sy-vline 
WA_WLF_IV_HELP_RK_STR-REBZZ_RK sy-vline 
WA_WLF_IV_HELP_RK_STR-BRTWR_RK sy-vline 
WA_WLF_IV_HELP_RK_STR-MWSBK_RK sy-vline 
WA_WLF_IV_HELP_RK_STR-BLART_RK sy-vline 
WA_WLF_IV_HELP_RK_STR-BKTXT_RK sy-vline 
WA_WLF_IV_HELP_RK_STR-WPYCUR_P1_RK sy-vline 
WA_WLF_IV_HELP_RK_STR-WKURS_P1_RK sy-vline 
WA_WLF_IV_HELP_RK_STR-PYAMT_RK sy-vline 
WA_WLF_IV_HELP_RK_STR-ZLSPR_RK sy-vline 
WA_WLF_IV_HELP_RK_STR-BVTYP_RK sy-vline 
WA_WLF_IV_HELP_RK_STR-LFGRU_RK sy-vline      INTO ld_text SEPARATED BY SPACE.

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