ABAP Select data from SAP table RMUSER into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM RMUSER
*  INTO TABLE @DATA(IT_RMUSER2).
*--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_RMUSER INDEX 1 INTO DATA(WA_RMUSER2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<RMUSER>-MANDT = 1.
<RMUSER>-UNAME = 1.
<RMUSER>-TCODE = 1.
<RMUSER>-WERKS = 1.
<RMUSER>-ALORT = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_RMUSER-VERID, sy-vline,
  WA_RMUSER-KDAUF, sy-vline,
  WA_RMUSER-KDPOS, sy-vline,
  WA_RMUSER-FTYPS, sy-vline,
  WA_RMUSER-FTYPM, sy-vline,
  WA_RMUSER-PLNUM, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_RMUSER 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_RMUSER 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_RMUSER INTO WA_RMUSER.


*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 KDAUF
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RMUSER-KDAUF
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RMUSER-KDAUF.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field PLNUM
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RMUSER-PLNUM
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RMUSER-PLNUM.
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_RMUSER_STR, 
MANDT TYPE STRING,
UNAME TYPE STRING,
TCODE TYPE STRING,
WERKS TYPE STRING,
ALORT TYPE STRING,
VERID TYPE STRING,
KDAUF TYPE STRING,
KDPOS TYPE STRING,
FTYPS TYPE STRING,
FTYPM TYPE STRING,
PLNUM TYPE STRING,
RADIOKDE TYPE STRING,
RADIOLAG TYPE STRING,
AGGRE TYPE STRING,
MDV01 TYPE STRING,
MDV02 TYPE STRING,END OF T_EKKO_STR.
DATA: WA_RMUSER_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_RMUSER_STR-MANDT sy-vline 
WA_RMUSER_STR-UNAME sy-vline 
WA_RMUSER_STR-TCODE sy-vline 
WA_RMUSER_STR-WERKS sy-vline 
WA_RMUSER_STR-ALORT sy-vline 
WA_RMUSER_STR-VERID sy-vline 
WA_RMUSER_STR-KDAUF sy-vline 
WA_RMUSER_STR-KDPOS sy-vline 
WA_RMUSER_STR-FTYPS sy-vline 
WA_RMUSER_STR-FTYPM sy-vline 
WA_RMUSER_STR-PLNUM sy-vline 
WA_RMUSER_STR-RADIOKDE sy-vline 
WA_RMUSER_STR-RADIOLAG sy-vline 
WA_RMUSER_STR-AGGRE sy-vline 
WA_RMUSER_STR-MDV01 sy-vline 
WA_RMUSER_STR-MDV02 sy-vline      INTO ld_text SEPARATED BY SPACE.

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