ABAP Select data from SAP table WRFV_HIERID into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM WRFV_HIERID
*  INTO TABLE @DATA(IT_WRFV_HIERID2).
*--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_WRFV_HIERID INDEX 1 INTO DATA(WA_WRFV_HIERID2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<WRFV_HIERID>-MANDT = 1.
<WRFV_HIERID>-HIER_ID = 1.
<WRFV_HIERID>-NODE = 1.
<WRFV_HIERID>-VKORG = 1.
<WRFV_HIERID>-VTWEG = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_WRFV_HIERID-STATUS, sy-vline,
  WA_WRFV_HIERID-PRODFLG, sy-vline,
  WA_WRFV_HIERID-BWFLG, sy-vline,
  WA_WRFV_HIERID-HIERFLG, sy-vline,
  WA_WRFV_HIERID-MLTPFLG, sy-vline,
  WA_WRFV_HIERID-DATEFLG, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_WRFV_HIERID 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_WRFV_HIERID 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_WRFV_HIERID INTO WA_WRFV_HIERID.


*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 ISOLA, internal->external for field SPRAS
CALL FUNCTION 'CONVERSION_EXIT_ISOLA_OUTPUT'
  EXPORTING
    input =                      WA_WRFV_HIERID-SPRAS
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_WRFV_HIERID-SPRAS.
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_WRFV_HIERID_STR, 
MANDT TYPE STRING,
HIER_ID TYPE STRING,
NODE TYPE STRING,
VKORG TYPE STRING,
VTWEG TYPE STRING,
STATUS TYPE STRING,
PRODFLG TYPE STRING,
BWFLG TYPE STRING,
HIERFLG TYPE STRING,
MLTPFLG TYPE STRING,
DATEFLG TYPE STRING,
LAEDA TYPE STRING,
LTEXT TYPE STRING,
SPRAS TYPE STRING,END OF T_EKKO_STR.
DATA: WA_WRFV_HIERID_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_WRFV_HIERID_STR-MANDT sy-vline 
WA_WRFV_HIERID_STR-HIER_ID sy-vline 
WA_WRFV_HIERID_STR-NODE sy-vline 
WA_WRFV_HIERID_STR-VKORG sy-vline 
WA_WRFV_HIERID_STR-VTWEG sy-vline 
WA_WRFV_HIERID_STR-STATUS sy-vline 
WA_WRFV_HIERID_STR-PRODFLG sy-vline 
WA_WRFV_HIERID_STR-BWFLG sy-vline 
WA_WRFV_HIERID_STR-HIERFLG sy-vline 
WA_WRFV_HIERID_STR-MLTPFLG sy-vline 
WA_WRFV_HIERID_STR-DATEFLG sy-vline 
WA_WRFV_HIERID_STR-LAEDA sy-vline 
WA_WRFV_HIERID_STR-LTEXT sy-vline 
WA_WRFV_HIERID_STR-SPRAS sy-vline      INTO ld_text SEPARATED BY SPACE.

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