ABAP Select data from SAP table RNMC02 into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP RNMC02 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 RNMC02. 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 RNMC02 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_RNMC02 TYPE STANDARD TABLE OF RNMC02,
      WA_RNMC02 TYPE RNMC02,
      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: <RNMC02> TYPE RNMC02.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_RNMC02.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM RNMC02
  INTO TABLE IT_RNMC02.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM RNMC02
*  INTO TABLE @DATA(IT_RNMC022).
*--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_RNMC02 INDEX 1 INTO DATA(WA_RNMC022).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_RNMC02 ASSIGNING <RNMC02>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<RNMC02>-POSNR = 1.
<RNMC02>-WERKS = 1.
<RNMC02>-MATNR = 1.
<RNMC02>-MENGE = 1.
<RNMC02>-MEINS = 1.

ENDLOOP.

LOOP AT IT_RNMC02 INTO WA_RNMC02.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_RNMC02-LFDAT, sy-vline,
  WA_RNMC02-BADAT, sy-vline,
  WA_RNMC02-MBLNR, sy-vline,
  WA_RNMC02-MBPOS, sy-vline,
  WA_RNMC02-MBART, sy-vline,
  WA_RNMC02-BNFDT, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_RNMC02 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_RNMC02 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_RNMC02 INTO WA_RNMC02.


*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 MATN1, internal->external for field MATNR
CALL FUNCTION 'CONVERSION_EXIT_MATN1_OUTPUT'
  EXPORTING
    input =                      WA_RNMC02-MATNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RNMC02-MATNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit CUNIT, internal->external for field MEINS
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_RNMC02-MEINS
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RNMC02-MEINS.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field MBLNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RNMC02-MBLNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RNMC02-MBLNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field EAUFN
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RNMC02-EAUFN
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RNMC02-EAUFN.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field KOSTL
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RNMC02-KOSTL
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RNMC02-KOSTL.
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_RNMC02_STR, 
POSNR TYPE STRING,
WERKS TYPE STRING,
MATNR TYPE STRING,
MENGE TYPE STRING,
MEINS TYPE STRING,
LFDAT TYPE STRING,
BADAT TYPE STRING,
MBLNR TYPE STRING,
MBPOS TYPE STRING,
MBART TYPE STRING,
BNFDT TYPE STRING,
EAUFN TYPE STRING,
KOSTL TYPE STRING,
ERRKZ TYPE STRING,
ERNAM TYPE STRING,
COTYP TYPE STRING,
POSTX TYPE STRING,
ABLAD TYPE STRING,
LGORT TYPE STRING,
WEMPF TYPE STRING,
FTXTKZ TYPE STRING,
TXZ01 TYPE STRING,
PRIO_URG TYPE STRING,
PRIO_REQ TYPE STRING,END OF T_EKKO_STR.
DATA: WA_RNMC02_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_RNMC02_STR-POSNR sy-vline 
WA_RNMC02_STR-WERKS sy-vline 
WA_RNMC02_STR-MATNR sy-vline 
WA_RNMC02_STR-MENGE sy-vline 
WA_RNMC02_STR-MEINS sy-vline 
WA_RNMC02_STR-LFDAT sy-vline 
WA_RNMC02_STR-BADAT sy-vline 
WA_RNMC02_STR-MBLNR sy-vline 
WA_RNMC02_STR-MBPOS sy-vline 
WA_RNMC02_STR-MBART sy-vline 
WA_RNMC02_STR-BNFDT sy-vline 
WA_RNMC02_STR-EAUFN sy-vline 
WA_RNMC02_STR-KOSTL sy-vline 
WA_RNMC02_STR-ERRKZ sy-vline 
WA_RNMC02_STR-ERNAM sy-vline 
WA_RNMC02_STR-COTYP sy-vline 
WA_RNMC02_STR-POSTX sy-vline 
WA_RNMC02_STR-ABLAD sy-vline 
WA_RNMC02_STR-LGORT sy-vline 
WA_RNMC02_STR-WEMPF sy-vline 
WA_RNMC02_STR-FTXTKZ sy-vline 
WA_RNMC02_STR-TXZ01 sy-vline 
WA_RNMC02_STR-PRIO_URG sy-vline 
WA_RNMC02_STR-PRIO_REQ sy-vline      INTO ld_text SEPARATED BY SPACE.

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