ABAP Select data from SAP table MPE_S_MRS_HIERARCHY into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP MPE_S_MRS_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 MPE_S_MRS_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 MPE_S_MRS_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_MPE_S_MRS_HIERARCHY TYPE STANDARD TABLE OF MPE_S_MRS_HIERARCHY,
      WA_MPE_S_MRS_HIERARCHY TYPE MPE_S_MRS_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: <MPE_S_MRS_HIERARCHY> TYPE MPE_S_MRS_HIERARCHY.

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM MPE_S_MRS_HIERARCHY
*  INTO TABLE @DATA(IT_MPE_S_MRS_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_MPE_S_MRS_HIERARCHY INDEX 1 INTO DATA(WA_MPE_S_MRS_HIERARCHY2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<MPE_S_MRS_HIERARCHY>-MFGREFSTRUCTUREUSAGE = 1.
<MPE_S_MRS_HIERARCHY>-MFGREFSTRUCHEADEROBJECT = 1.
<MPE_S_MRS_HIERARCHY>-MFGREFSTRUCITEMOBJECT = 1.
<MPE_S_MRS_HIERARCHY>-MFGREFSTRUCITMREFDESIGNATOR = 1.
<MPE_S_MRS_HIERARCHY>-MFGREFOBJECTGROUP = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_MPE_S_MRS_HIERARCHY-MFGREFSTRUCITEMSORTPOSITIONVAL, sy-vline,
  WA_MPE_S_MRS_HIERARCHY-ISOBSOLETE, sy-vline,
  WA_MPE_S_MRS_HIERARCHY-MFGREFSTRUCITMREFDSGNTRNAME, sy-vline,
  WA_MPE_S_MRS_HIERARCHY-MFGREFSTRUCTUREITEMEXTERNALID, sy-vline,
  WA_MPE_S_MRS_HIERARCHY-MFGREFOBJECTGROUPDESC, sy-vline,
  WA_MPE_S_MRS_HIERARCHY-MFGREFSTRUCTUREUSAGEDESC, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_MPE_S_MRS_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_MPE_S_MRS_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_MPE_S_MRS_HIERARCHY INTO WA_MPE_S_MRS_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.
ENDFORM. 

*&---------------------------------------------------------------------*
*& Form process_as_string_field_values
*&---------------------------------------------------------------------*
FORM process_as_string_field_values CHANGING p_EKKO LIKE wa_EKKO.

TYPES: BEGIN OF T_MPE_S_MRS_HIERARCHY_STR, 
MFGREFSTRUCTUREUSAGE TYPE STRING,
MFGREFSTRUCHEADEROBJECT TYPE STRING,
MFGREFSTRUCITEMOBJECT TYPE STRING,
MFGREFSTRUCITMREFDESIGNATOR TYPE STRING,
MFGREFOBJECTGROUP TYPE STRING,
MFGREFSTRUCITEMSORTPOSITIONVAL TYPE STRING,
ISOBSOLETE TYPE STRING,
MFGREFSTRUCITMREFDSGNTRNAME TYPE STRING,
MFGREFSTRUCTUREITEMEXTERNALID TYPE STRING,
MFGREFOBJECTGROUPDESC TYPE STRING,
MFGREFSTRUCTUREUSAGEDESC TYPE STRING,
MFGREFSTRUCITMREFDSGNTRDESC TYPE STRING,
MFGREFOBJECTDESC TYPE STRING,
MFGREFOBJECTISROOT TYPE STRING,
MFGREFPATHUUID TYPE STRING,
MFGREFHIERARCHYROOTOBJECT TYPE STRING,
DUMMY_STRITM_INCL_EEW_PS TYPE STRING,
HIERARCHYNODE TYPE STRING,
HIERARCHYPARENTNODE TYPE STRING,
HIERARCHYNODEORDINALNUMBER TYPE STRING,
HIERARCHYPARENTNODEORDINALNMBR TYPE STRING,
HIERARCHYLEVEL TYPE STRING,
HIERARCHYNODESUBTREESIZE TYPE STRING,
HIERARCHYNODEISORPHAN TYPE STRING,
HIERARCHYNODEISCYCLEENDPOINT TYPE STRING,
HIERARCHY_DISTANCE TYPE STRING,
HIERARCHY_ROOT TYPE STRING,
HIERARCHYDESCENDANTCOUNT TYPE STRING,
HIERARCHYDRILLSTATE TYPE STRING,
HIERARCHYDISTANCEFROMROOT TYPE STRING,END OF T_EKKO_STR.
DATA: WA_MPE_S_MRS_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_MPE_S_MRS_HIERARCHY_STR-MFGREFSTRUCTUREUSAGE sy-vline 
WA_MPE_S_MRS_HIERARCHY_STR-MFGREFSTRUCHEADEROBJECT sy-vline 
WA_MPE_S_MRS_HIERARCHY_STR-MFGREFSTRUCITEMOBJECT sy-vline 
WA_MPE_S_MRS_HIERARCHY_STR-MFGREFSTRUCITMREFDESIGNATOR sy-vline 
WA_MPE_S_MRS_HIERARCHY_STR-MFGREFOBJECTGROUP sy-vline 
WA_MPE_S_MRS_HIERARCHY_STR-MFGREFSTRUCITEMSORTPOSITIONVAL sy-vline 
WA_MPE_S_MRS_HIERARCHY_STR-ISOBSOLETE sy-vline 
WA_MPE_S_MRS_HIERARCHY_STR-MFGREFSTRUCITMREFDSGNTRNAME sy-vline 
WA_MPE_S_MRS_HIERARCHY_STR-MFGREFSTRUCTUREITEMEXTERNALID sy-vline 
WA_MPE_S_MRS_HIERARCHY_STR-MFGREFOBJECTGROUPDESC sy-vline 
WA_MPE_S_MRS_HIERARCHY_STR-MFGREFSTRUCTUREUSAGEDESC sy-vline 
WA_MPE_S_MRS_HIERARCHY_STR-MFGREFSTRUCITMREFDSGNTRDESC sy-vline 
WA_MPE_S_MRS_HIERARCHY_STR-MFGREFOBJECTDESC sy-vline 
WA_MPE_S_MRS_HIERARCHY_STR-MFGREFOBJECTISROOT sy-vline 
WA_MPE_S_MRS_HIERARCHY_STR-MFGREFPATHUUID sy-vline 
WA_MPE_S_MRS_HIERARCHY_STR-MFGREFHIERARCHYROOTOBJECT sy-vline 
WA_MPE_S_MRS_HIERARCHY_STR-DUMMY_STRITM_INCL_EEW_PS sy-vline 
WA_MPE_S_MRS_HIERARCHY_STR-HIERARCHYNODE sy-vline 
WA_MPE_S_MRS_HIERARCHY_STR-HIERARCHYPARENTNODE sy-vline 
WA_MPE_S_MRS_HIERARCHY_STR-HIERARCHYNODEORDINALNUMBER sy-vline 
WA_MPE_S_MRS_HIERARCHY_STR-HIERARCHYPARENTNODEORDINALNMBR sy-vline 
WA_MPE_S_MRS_HIERARCHY_STR-HIERARCHYLEVEL sy-vline 
WA_MPE_S_MRS_HIERARCHY_STR-HIERARCHYNODESUBTREESIZE sy-vline 
WA_MPE_S_MRS_HIERARCHY_STR-HIERARCHYNODEISORPHAN sy-vline 
WA_MPE_S_MRS_HIERARCHY_STR-HIERARCHYNODEISCYCLEENDPOINT sy-vline 
WA_MPE_S_MRS_HIERARCHY_STR-HIERARCHY_DISTANCE sy-vline 
WA_MPE_S_MRS_HIERARCHY_STR-HIERARCHY_ROOT sy-vline 
WA_MPE_S_MRS_HIERARCHY_STR-HIERARCHYDESCENDANTCOUNT sy-vline 
WA_MPE_S_MRS_HIERARCHY_STR-HIERARCHYDRILLSTATE sy-vline 
WA_MPE_S_MRS_HIERARCHY_STR-HIERARCHYDISTANCEFROMROOT sy-vline      INTO ld_text SEPARATED BY SPACE.

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