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

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM /MRSS/D_RM_MDATA
*  INTO TABLE @DATA(IT_/MRSS/D_RM_MDATA2).
*--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/D_RM_MDATA INDEX 1 INTO DATA(WA_/MRSS/D_RM_MDATA2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
</MRSS/D_RM_MDATA>-CLIENT = 1.
</MRSS/D_RM_MDATA>-SEQNR = 1.
</MRSS/D_RM_MDATA>-CUSTOMER_DUMMY = 1.
</MRSS/D_RM_MDATA>-USE_BTN_AUTH_TBL = 1.
</MRSS/D_RM_MDATA>-HELP_URL = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_/MRSS/D_RM_MDATA-MAX_COUNT, sy-vline,
  WA_/MRSS/D_RM_MDATA-SP_CAND_VISIBLE, sy-vline,
  WA_/MRSS/D_RM_MDATA-DNS_STR, sy-vline,
  WA_/MRSS/D_RM_MDATA-VENDOR_DUMMY, sy-vline,
  WA_/MRSS/D_RM_MDATA-TIMESPEC_ONEROW, sy-vline,
  WA_/MRSS/D_RM_MDATA-SEARCH_MAX_HITS, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_/MRSS/D_RM_MDATA 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/D_RM_MDATA 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/D_RM_MDATA INTO WA_/MRSS/D_RM_MDATA.


*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 CUSTOMER_DUMMY
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_/MRSS/D_RM_MDATA-CUSTOMER_DUMMY
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_/MRSS/D_RM_MDATA-CUSTOMER_DUMMY.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field VENDOR_DUMMY
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_/MRSS/D_RM_MDATA-VENDOR_DUMMY
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_/MRSS/D_RM_MDATA-VENDOR_DUMMY.
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_/MRSS/D_RM_MDATA_STR, 
CLIENT TYPE STRING,
SEQNR TYPE STRING,
CUSTOMER_DUMMY TYPE STRING,
USE_BTN_AUTH_TBL TYPE STRING,
HELP_URL TYPE STRING,
MAX_COUNT TYPE STRING,
SP_CAND_VISIBLE TYPE STRING,
DNS_STR TYPE STRING,
VENDOR_DUMMY TYPE STRING,
TIMESPEC_ONEROW TYPE STRING,
SEARCH_MAX_HITS TYPE STRING,
EMP_PROFILE TYPE STRING,
PACE_FIELD_CH TYPE STRING,
PERF_USTR_MATCH TYPE STRING,
DELETE_ASSIGN TYPE STRING,
USE_PB1_INTEROP TYPE STRING,
PLB_PROFILE TYPE STRING,
REPT_HELP_URL TYPE STRING,
EMP_ADTR_COMP TYPE STRING,
UNAME_FOR_INO TYPE STRING,
OTYPE_SERV_SALES TYPE STRING,
OTYPE_DELV_ORG TYPE STRING,
USER_PARAM_URL TYPE STRING,
R3_SAME_LOGSYS TYPE STRING,
SRM_CREATE_COMP TYPE STRING,
SRM_DIS_COMP TYPE STRING,
PORTAL_RFCDEST TYPE STRING,
MYVIEW_REQROLE TYPE STRING,
EN_CUSTOM TYPE STRING,
WD_CUSTOM_COMP TYPE STRING,
CPY_CAND_ASG_DET TYPE STRING,
PLB_FOR_ASGMTS TYPE STRING,
SHOW_HOURS TYPE STRING,
USE_TIME_FRAMES TYPE STRING,
DURATION_UNIT TYPE STRING,END OF T_EKKO_STR.
DATA: WA_/MRSS/D_RM_MDATA_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/D_RM_MDATA_STR-CLIENT sy-vline 
WA_/MRSS/D_RM_MDATA_STR-SEQNR sy-vline 
WA_/MRSS/D_RM_MDATA_STR-CUSTOMER_DUMMY sy-vline 
WA_/MRSS/D_RM_MDATA_STR-USE_BTN_AUTH_TBL sy-vline 
WA_/MRSS/D_RM_MDATA_STR-HELP_URL sy-vline 
WA_/MRSS/D_RM_MDATA_STR-MAX_COUNT sy-vline 
WA_/MRSS/D_RM_MDATA_STR-SP_CAND_VISIBLE sy-vline 
WA_/MRSS/D_RM_MDATA_STR-DNS_STR sy-vline 
WA_/MRSS/D_RM_MDATA_STR-VENDOR_DUMMY sy-vline 
WA_/MRSS/D_RM_MDATA_STR-TIMESPEC_ONEROW sy-vline 
WA_/MRSS/D_RM_MDATA_STR-SEARCH_MAX_HITS sy-vline 
WA_/MRSS/D_RM_MDATA_STR-EMP_PROFILE sy-vline 
WA_/MRSS/D_RM_MDATA_STR-PACE_FIELD_CH sy-vline 
WA_/MRSS/D_RM_MDATA_STR-PERF_USTR_MATCH sy-vline 
WA_/MRSS/D_RM_MDATA_STR-DELETE_ASSIGN sy-vline 
WA_/MRSS/D_RM_MDATA_STR-USE_PB1_INTEROP sy-vline 
WA_/MRSS/D_RM_MDATA_STR-PLB_PROFILE sy-vline 
WA_/MRSS/D_RM_MDATA_STR-REPT_HELP_URL sy-vline 
WA_/MRSS/D_RM_MDATA_STR-EMP_ADTR_COMP sy-vline 
WA_/MRSS/D_RM_MDATA_STR-UNAME_FOR_INO sy-vline 
WA_/MRSS/D_RM_MDATA_STR-OTYPE_SERV_SALES sy-vline 
WA_/MRSS/D_RM_MDATA_STR-OTYPE_DELV_ORG sy-vline 
WA_/MRSS/D_RM_MDATA_STR-USER_PARAM_URL sy-vline 
WA_/MRSS/D_RM_MDATA_STR-R3_SAME_LOGSYS sy-vline 
WA_/MRSS/D_RM_MDATA_STR-SRM_CREATE_COMP sy-vline 
WA_/MRSS/D_RM_MDATA_STR-SRM_DIS_COMP sy-vline 
WA_/MRSS/D_RM_MDATA_STR-PORTAL_RFCDEST sy-vline 
WA_/MRSS/D_RM_MDATA_STR-MYVIEW_REQROLE sy-vline 
WA_/MRSS/D_RM_MDATA_STR-EN_CUSTOM sy-vline 
WA_/MRSS/D_RM_MDATA_STR-WD_CUSTOM_COMP sy-vline 
WA_/MRSS/D_RM_MDATA_STR-CPY_CAND_ASG_DET sy-vline 
WA_/MRSS/D_RM_MDATA_STR-PLB_FOR_ASGMTS sy-vline 
WA_/MRSS/D_RM_MDATA_STR-SHOW_HOURS sy-vline 
WA_/MRSS/D_RM_MDATA_STR-USE_TIME_FRAMES sy-vline 
WA_/MRSS/D_RM_MDATA_STR-DURATION_UNIT sy-vline      INTO ld_text SEPARATED BY SPACE.

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