ABAP Select data from SAP table RCOMSE into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM RCOMSE
*  INTO TABLE @DATA(IT_RCOMSE2).
*--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_RCOMSE INDEX 1 INTO DATA(WA_RCOMSE2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<RCOMSE>-MANDT = 1.
<RCOMSE>-MSID = 1.
<RCOMSE>-ATINN = 1.
<RCOMSE>-ATWRT = 1.
<RCOMSE>-ATFLV = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_RCOMSE-ATFLB, sy-vline,
  WA_RCOMSE-ATAWE, sy-vline,
  WA_RCOMSE-ATAW1, sy-vline,
  WA_RCOMSE-ATCOD, sy-vline,
  WA_RCOMSE-ATFOR, sy-vline,
  WA_RCOMSE-UKZ, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_RCOMSE 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_RCOMSE 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_RCOMSE INTO WA_RCOMSE.


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

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

*Conversion exit CUNIT, internal->external for field ATAW1
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_RCOMSE-ATAW1
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RCOMSE-ATAW1.
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_RCOMSE_STR, 
MANDT TYPE STRING,
MSID TYPE STRING,
ATINN TYPE STRING,
ATWRT TYPE STRING,
ATFLV TYPE STRING,
ATFLB TYPE STRING,
ATAWE TYPE STRING,
ATAW1 TYPE STRING,
ATCOD TYPE STRING,
ATFOR TYPE STRING,
UKZ TYPE STRING,
ATWRTSHOW TYPE STRING,
OBLKZ TYPE STRING,
TXTRF TYPE STRING,
WRTKZ TYPE STRING,
ATNAM TYPE STRING,
ATBEZ TYPE STRING,
SKZ TYPE STRING,END OF T_EKKO_STR.
DATA: WA_RCOMSE_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_RCOMSE_STR-MANDT sy-vline 
WA_RCOMSE_STR-MSID sy-vline 
WA_RCOMSE_STR-ATINN sy-vline 
WA_RCOMSE_STR-ATWRT sy-vline 
WA_RCOMSE_STR-ATFLV sy-vline 
WA_RCOMSE_STR-ATFLB sy-vline 
WA_RCOMSE_STR-ATAWE sy-vline 
WA_RCOMSE_STR-ATAW1 sy-vline 
WA_RCOMSE_STR-ATCOD sy-vline 
WA_RCOMSE_STR-ATFOR sy-vline 
WA_RCOMSE_STR-UKZ sy-vline 
WA_RCOMSE_STR-ATWRTSHOW sy-vline 
WA_RCOMSE_STR-OBLKZ sy-vline 
WA_RCOMSE_STR-TXTRF sy-vline 
WA_RCOMSE_STR-WRTKZ sy-vline 
WA_RCOMSE_STR-ATNAM sy-vline 
WA_RCOMSE_STR-ATBEZ sy-vline 
WA_RCOMSE_STR-SKZ sy-vline      INTO ld_text SEPARATED BY SPACE.

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