ABAP Select data from SAP table /MRSS/V_RM_DEMDT into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP /MRSS/V_RM_DEMDT 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 /MRSS/V_RM_DEMDT. 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 /MRSS/V_RM_DEMDT 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_/MRSS/V_RM_DEMDT TYPE STANDARD TABLE OF /MRSS/V_RM_DEMDT,
      WA_/MRSS/V_RM_DEMDT TYPE /MRSS/V_RM_DEMDT,
      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: </MRSS/V_RM_DEMDT> TYPE /MRSS/V_RM_DEMDT.

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

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM /MRSS/V_RM_DEMDT
  INTO TABLE IT_/MRSS/V_RM_DEMDT.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM /MRSS/V_RM_DEMDT
*  INTO TABLE @DATA(IT_/MRSS/V_RM_DEMDT2).
*--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_/MRSS/V_RM_DEMDT INDEX 1 INTO DATA(WA_/MRSS/V_RM_DEMDT2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_/MRSS/V_RM_DEMDT ASSIGNING </MRSS/V_RM_DEMDT>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
</MRSS/V_RM_DEMDT>-H_GUID = 1.
</MRSS/V_RM_DEMDT>-REQ_ID = 1.
</MRSS/V_RM_DEMDT>-DEM_GUID = 1.
</MRSS/V_RM_DEMDT>-ROLE_NUM = 1.
</MRSS/V_RM_DEMDT>-ROLE_DESC = 1.

ENDLOOP.

LOOP AT IT_/MRSS/V_RM_DEMDT INTO WA_/MRSS/V_RM_DEMDT.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_/MRSS/V_RM_DEMDT-ROLE_CHANGEDAT, sy-vline,
  WA_/MRSS/V_RM_DEMDT-ROLE_PL_NODE, sy-vline,
  WA_/MRSS/V_RM_DEMDT-PARTNER_GUID, sy-vline,
  WA_/MRSS/V_RM_DEMDT-ROLE_TYPE, sy-vline,
  WA_/MRSS/V_RM_DEMDT-PARTNER_ROLE, sy-vline,
  WA_/MRSS/V_RM_DEMDT-PARTNER_ID, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_/MRSS/V_RM_DEMDT 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_/MRSS/V_RM_DEMDT 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_/MRSS/V_RM_DEMDT INTO WA_/MRSS/V_RM_DEMDT.


*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_/MRSS/V_RM_DEMDT_STR, 
H_GUID TYPE STRING,
REQ_ID TYPE STRING,
DEM_GUID TYPE STRING,
ROLE_NUM TYPE STRING,
ROLE_DESC TYPE STRING,
ROLE_CHANGEDAT TYPE STRING,
ROLE_PL_NODE TYPE STRING,
PARTNER_GUID TYPE STRING,
ROLE_TYPE TYPE STRING,
PARTNER_ROLE TYPE STRING,
PARTNER_ID TYPE STRING,
PL_NODE TYPE STRING,
FOUND_RESOURCES TYPE STRING,END OF T_EKKO_STR.
DATA: WA_/MRSS/V_RM_DEMDT_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_/MRSS/V_RM_DEMDT_STR-H_GUID sy-vline 
WA_/MRSS/V_RM_DEMDT_STR-REQ_ID sy-vline 
WA_/MRSS/V_RM_DEMDT_STR-DEM_GUID sy-vline 
WA_/MRSS/V_RM_DEMDT_STR-ROLE_NUM sy-vline 
WA_/MRSS/V_RM_DEMDT_STR-ROLE_DESC sy-vline 
WA_/MRSS/V_RM_DEMDT_STR-ROLE_CHANGEDAT sy-vline 
WA_/MRSS/V_RM_DEMDT_STR-ROLE_PL_NODE sy-vline 
WA_/MRSS/V_RM_DEMDT_STR-PARTNER_GUID sy-vline 
WA_/MRSS/V_RM_DEMDT_STR-ROLE_TYPE sy-vline 
WA_/MRSS/V_RM_DEMDT_STR-PARTNER_ROLE sy-vline 
WA_/MRSS/V_RM_DEMDT_STR-PARTNER_ID sy-vline 
WA_/MRSS/V_RM_DEMDT_STR-PL_NODE sy-vline 
WA_/MRSS/V_RM_DEMDT_STR-FOUND_RESOURCES sy-vline      INTO ld_text SEPARATED BY SPACE.

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