ABAP Select data from SAP table RNMMBC into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM RNMMBC
*  INTO TABLE @DATA(IT_RNMMBC2).
*--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_RNMMBC INDEX 1 INTO DATA(WA_RNMMBC2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<RNMMBC>-EAN11 = 1.
<RNMMBC>-MATNR = 1.
<RNMMBC>-MENGE = 1.
<RNMMBC>-MEINS = 1.
<RNMMBC>-WERKS = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_RNMMBC-LFDAT, sy-vline,
  WA_RNMMBC-POSTX, sy-vline,
  WA_RNMMBC-LNRLM, sy-vline,
  WA_RNMMBC-CSTOCK, sy-vline,
  WA_RNMMBC-FTXTKZ, sy-vline,
  WA_RNMMBC-MTEXT, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_RNMMBC 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_RNMMBC 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_RNMMBC INTO WA_RNMMBC.


*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 EAN11, internal->external for field EAN11
CALL FUNCTION 'CONVERSION_EXIT_EAN11_OUTPUT'
  EXPORTING
    input =                      WA_RNMMBC-EAN11
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RNMMBC-EAN11.
WRITE:/ 'New Value:', ld_input.

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

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

*Conversion exit ALPHA, internal->external for field LNRLM
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RNMMBC-LNRLM
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RNMMBC-LNRLM.
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_RNMMBC_STR, 
EAN11 TYPE STRING,
MATNR TYPE STRING,
MENGE TYPE STRING,
MEINS TYPE STRING,
WERKS TYPE STRING,
LFDAT TYPE STRING,
POSTX TYPE STRING,
LNRLM TYPE STRING,
CSTOCK TYPE STRING,
FTXTKZ TYPE STRING,
MTEXT TYPE STRING,END OF T_EKKO_STR.
DATA: WA_RNMMBC_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_RNMMBC_STR-EAN11 sy-vline 
WA_RNMMBC_STR-MATNR sy-vline 
WA_RNMMBC_STR-MENGE sy-vline 
WA_RNMMBC_STR-MEINS sy-vline 
WA_RNMMBC_STR-WERKS sy-vline 
WA_RNMMBC_STR-LFDAT sy-vline 
WA_RNMMBC_STR-POSTX sy-vline 
WA_RNMMBC_STR-LNRLM sy-vline 
WA_RNMMBC_STR-CSTOCK sy-vline 
WA_RNMMBC_STR-FTXTKZ sy-vline 
WA_RNMMBC_STR-MTEXT sy-vline      INTO ld_text SEPARATED BY SPACE.

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