ABAP Select data from SAP table RNCOMPBEW into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM RNCOMPBEW
*  INTO TABLE @DATA(IT_RNCOMPBEW2).
*--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_RNCOMPBEW INDEX 1 INTO DATA(WA_RNCOMPBEW2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<RNCOMPBEW>-BWIDT = 1.
<RNCOMPBEW>-BWIZT = 1.
<RNCOMPBEW>-BWEDT = 1.
<RNCOMPBEW>-BWEZT = 1.
<RNCOMPBEW>-BWART = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_RNCOMPBEW-BWATX, sy-vline,
  WA_RNCOMPBEW-BEWTY, sy-vline,
  WA_RNCOMPBEW-BEWTX, sy-vline,
  WA_RNCOMPBEW-ORGPF, sy-vline,
  WA_RNCOMPBEW-ORGFA, sy-vline,
  WA_RNCOMPBEW-ORPKB, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_RNCOMPBEW 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_RNCOMPBEW 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_RNCOMPBEW INTO WA_RNCOMPBEW.


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

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

*Conversion exit ALPHA, internal->external for field BEKAT
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RNCOMPBEW-BEKAT
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RNCOMPBEW-BEKAT.
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_RNCOMPBEW_STR, 
BWIDT TYPE STRING,
BWIZT TYPE STRING,
BWEDT TYPE STRING,
BWEZT TYPE STRING,
BWART TYPE STRING,
BWATX TYPE STRING,
BEWTY TYPE STRING,
BEWTX TYPE STRING,
ORGPF TYPE STRING,
ORGFA TYPE STRING,
ORPKB TYPE STRING,
ORFKB TYPE STRING,
PLENT TYPE STRING,
BEKAT TYPE STRING,
OPERA TYPE STRING,END OF T_EKKO_STR.
DATA: WA_RNCOMPBEW_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_RNCOMPBEW_STR-BWIDT sy-vline 
WA_RNCOMPBEW_STR-BWIZT sy-vline 
WA_RNCOMPBEW_STR-BWEDT sy-vline 
WA_RNCOMPBEW_STR-BWEZT sy-vline 
WA_RNCOMPBEW_STR-BWART sy-vline 
WA_RNCOMPBEW_STR-BWATX sy-vline 
WA_RNCOMPBEW_STR-BEWTY sy-vline 
WA_RNCOMPBEW_STR-BEWTX sy-vline 
WA_RNCOMPBEW_STR-ORGPF sy-vline 
WA_RNCOMPBEW_STR-ORGFA sy-vline 
WA_RNCOMPBEW_STR-ORPKB sy-vline 
WA_RNCOMPBEW_STR-ORFKB sy-vline 
WA_RNCOMPBEW_STR-PLENT sy-vline 
WA_RNCOMPBEW_STR-BEKAT sy-vline 
WA_RNCOMPBEW_STR-OPERA sy-vline      INTO ld_text SEPARATED BY SPACE.

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