ABAP Select data from SAP table RDM_S_HIERARCHY into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM RDM_S_HIERARCHY
*  INTO TABLE @DATA(IT_RDM_S_HIERARCHY2).
*--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_RDM_S_HIERARCHY INDEX 1 INTO DATA(WA_RDM_S_HIERARCHY2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<RDM_S_HIERARCHY>-MATNR = 1.
<RDM_S_HIERARCHY>-SATNR = 1.
<RDM_S_HIERARCHY>-HIER_ID = 1.
<RDM_S_HIERARCHY>-NODE01 = 1.
<RDM_S_HIERARCHY>-NODE02 = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_RDM_S_HIERARCHY-NODE03, sy-vline,
  WA_RDM_S_HIERARCHY-NODE04, sy-vline,
  WA_RDM_S_HIERARCHY-NODE05, sy-vline,
  WA_RDM_S_HIERARCHY-NODE06, sy-vline,
  WA_RDM_S_HIERARCHY-NODE07, sy-vline,
  WA_RDM_S_HIERARCHY-NODE08, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_RDM_S_HIERARCHY 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_RDM_S_HIERARCHY 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_RDM_S_HIERARCHY INTO WA_RDM_S_HIERARCHY.


*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_RDM_S_HIERARCHY-MATNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RDM_S_HIERARCHY-MATNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit MATN1, internal->external for field SATNR
CALL FUNCTION 'CONVERSION_EXIT_MATN1_OUTPUT'
  EXPORTING
    input =                      WA_RDM_S_HIERARCHY-SATNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RDM_S_HIERARCHY-SATNR.
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_RDM_S_HIERARCHY_STR, 
MATNR TYPE STRING,
SATNR TYPE STRING,
HIER_ID TYPE STRING,
NODE01 TYPE STRING,
NODE02 TYPE STRING,
NODE03 TYPE STRING,
NODE04 TYPE STRING,
NODE05 TYPE STRING,
NODE06 TYPE STRING,
NODE07 TYPE STRING,
NODE08 TYPE STRING,
NODE09 TYPE STRING,
NODE10 TYPE STRING,
NODE01_T TYPE STRING,
NODE02_T TYPE STRING,
NODE03_T TYPE STRING,
NODE04_T TYPE STRING,
NODE05_T TYPE STRING,
NODE06_T TYPE STRING,
NODE07_T TYPE STRING,
NODE08_T TYPE STRING,
NODE09_T TYPE STRING,
NODE10_T TYPE STRING,END OF T_EKKO_STR.
DATA: WA_RDM_S_HIERARCHY_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_RDM_S_HIERARCHY_STR-MATNR sy-vline 
WA_RDM_S_HIERARCHY_STR-SATNR sy-vline 
WA_RDM_S_HIERARCHY_STR-HIER_ID sy-vline 
WA_RDM_S_HIERARCHY_STR-NODE01 sy-vline 
WA_RDM_S_HIERARCHY_STR-NODE02 sy-vline 
WA_RDM_S_HIERARCHY_STR-NODE03 sy-vline 
WA_RDM_S_HIERARCHY_STR-NODE04 sy-vline 
WA_RDM_S_HIERARCHY_STR-NODE05 sy-vline 
WA_RDM_S_HIERARCHY_STR-NODE06 sy-vline 
WA_RDM_S_HIERARCHY_STR-NODE07 sy-vline 
WA_RDM_S_HIERARCHY_STR-NODE08 sy-vline 
WA_RDM_S_HIERARCHY_STR-NODE09 sy-vline 
WA_RDM_S_HIERARCHY_STR-NODE10 sy-vline 
WA_RDM_S_HIERARCHY_STR-NODE01_T sy-vline 
WA_RDM_S_HIERARCHY_STR-NODE02_T sy-vline 
WA_RDM_S_HIERARCHY_STR-NODE03_T sy-vline 
WA_RDM_S_HIERARCHY_STR-NODE04_T sy-vline 
WA_RDM_S_HIERARCHY_STR-NODE05_T sy-vline 
WA_RDM_S_HIERARCHY_STR-NODE06_T sy-vline 
WA_RDM_S_HIERARCHY_STR-NODE07_T sy-vline 
WA_RDM_S_HIERARCHY_STR-NODE08_T sy-vline 
WA_RDM_S_HIERARCHY_STR-NODE09_T sy-vline 
WA_RDM_S_HIERARCHY_STR-NODE10_T sy-vline      INTO ld_text SEPARATED BY SPACE.

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