ABAP Select data from SAP table RNLMR3 into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP RNLMR3 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 RNLMR3. 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 RNLMR3 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_RNLMR3 TYPE STANDARD TABLE OF RNLMR3,
      WA_RNLMR3 TYPE RNLMR3,
      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: <RNLMR3> TYPE RNLMR3.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_RNLMR3.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM RNLMR3
  INTO TABLE IT_RNLMR3.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM RNLMR3
*  INTO TABLE @DATA(IT_RNLMR32).
*--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_RNLMR3 INDEX 1 INTO DATA(WA_RNLMR32).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_RNLMR3 ASSIGNING <RNLMR3>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<RNLMR3>-RECNR = 1.
<RNLMR3>-INSNR = 1.
<RNLMR3>-OPNNR = 1.
<RNLMR3>-VAWNR = 1.
<RNLMR3>-VERNR = 1.

ENDLOOP.

LOOP AT IT_RNLMR3 INTO WA_RNLMR3.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_RNLMR3-VRCOD, sy-vline,
  WA_RNLMR3-VRAAN, sy-vline,
  WA_RNLMR3-DIANR, sy-vline,
  WA_RNLMR3-VRDAT, sy-vline,
  WA_RNLMR3-OPER0, sy-vline,
  WA_RNLMR3-OPNR1, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_RNLMR3 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_RNLMR3 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_RNLMR3 INTO WA_RNLMR3.


*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 OPNNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RNLMR3-OPNNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RNLMR3-OPNNR.
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_RNLMR3_STR, 
RECNR TYPE STRING,
INSNR TYPE STRING,
OPNNR TYPE STRING,
VAWNR TYPE STRING,
VERNR TYPE STRING,
VRCOD TYPE STRING,
VRAAN TYPE STRING,
DIANR TYPE STRING,
VRDAT TYPE STRING,
OPER0 TYPE STRING,
OPNR1 TYPE STRING,
OPER1 TYPE STRING,
OPNR2 TYPE STRING,
OPER2 TYPE STRING,
VRINS TYPE STRING,
VRSPC TYPE STRING,END OF T_EKKO_STR.
DATA: WA_RNLMR3_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_RNLMR3_STR-RECNR sy-vline 
WA_RNLMR3_STR-INSNR sy-vline 
WA_RNLMR3_STR-OPNNR sy-vline 
WA_RNLMR3_STR-VAWNR sy-vline 
WA_RNLMR3_STR-VERNR sy-vline 
WA_RNLMR3_STR-VRCOD sy-vline 
WA_RNLMR3_STR-VRAAN sy-vline 
WA_RNLMR3_STR-DIANR sy-vline 
WA_RNLMR3_STR-VRDAT sy-vline 
WA_RNLMR3_STR-OPER0 sy-vline 
WA_RNLMR3_STR-OPNR1 sy-vline 
WA_RNLMR3_STR-OPER1 sy-vline 
WA_RNLMR3_STR-OPNR2 sy-vline 
WA_RNLMR3_STR-OPER2 sy-vline 
WA_RNLMR3_STR-VRINS sy-vline 
WA_RNLMR3_STR-VRSPC sy-vline      INTO ld_text SEPARATED BY SPACE.

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