ABAP Select data from SAP table RCNBOM into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM RCNBOM
*  INTO TABLE @DATA(IT_RCNBOM2).
*--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_RCNBOM INDEX 1 INTO DATA(WA_RCNBOM2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<RCNBOM>-VBELN = 1.
<RCNBOM>-POSNR = 1.
<RCNBOM>-PSPNR = 1.
<RCNBOM>-MATNR = 1.
<RCNBOM>-WERKS = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_RCNBOM-STLAN, sy-vline,
  WA_RCNBOM-CUOBJ, sy-vline,
  WA_RCNBOM-BDMNG, sy-vline,
  WA_RCNBOM-STLTY, sy-vline,
  WA_RCNBOM-CAPID, sy-vline,
  WA_RCNBOM-TECHS, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_RCNBOM 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_RCNBOM 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_RCNBOM INTO WA_RCNBOM.


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

*Conversion exit ABPSP, internal->external for field PSPNR
CALL FUNCTION 'CONVERSION_EXIT_ABPSP_OUTPUT'
  EXPORTING
    input =                      WA_RCNBOM-PSPNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RCNBOM-PSPNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit MATN1, internal->external for field MATNR
CALL FUNCTION 'CONVERSION_EXIT_MATN1_OUTPUT'
  EXPORTING
    input =                      WA_RCNBOM-MATNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RCNBOM-MATNR.
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_RCNBOM_STR, 
VBELN TYPE STRING,
POSNR TYPE STRING,
PSPNR TYPE STRING,
MATNR TYPE STRING,
WERKS TYPE STRING,
STLAN TYPE STRING,
CUOBJ TYPE STRING,
BDMNG TYPE STRING,
STLTY TYPE STRING,
CAPID TYPE STRING,
TECHS TYPE STRING,
CUS_DOCK TYPE STRING,
SERNR TYPE STRING,END OF T_EKKO_STR.
DATA: WA_RCNBOM_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_RCNBOM_STR-VBELN sy-vline 
WA_RCNBOM_STR-POSNR sy-vline 
WA_RCNBOM_STR-PSPNR sy-vline 
WA_RCNBOM_STR-MATNR sy-vline 
WA_RCNBOM_STR-WERKS sy-vline 
WA_RCNBOM_STR-STLAN sy-vline 
WA_RCNBOM_STR-CUOBJ sy-vline 
WA_RCNBOM_STR-BDMNG sy-vline 
WA_RCNBOM_STR-STLTY sy-vline 
WA_RCNBOM_STR-CAPID sy-vline 
WA_RCNBOM_STR-TECHS sy-vline 
WA_RCNBOM_STR-CUS_DOCK sy-vline 
WA_RCNBOM_STR-SERNR sy-vline      INTO ld_text SEPARATED BY SPACE.

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