ABAP Select data from SAP table RCOMEP into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM RCOMEP
*  INTO TABLE @DATA(IT_RCOMEP2).
*--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_RCOMEP INDEX 1 INTO DATA(WA_RCOMEP2).


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

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

ENDLOOP.

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

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


*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_RCOMEP-ATINN
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RCOMEP-ATINN.
WRITE:/ 'New Value:', ld_input.

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

*Conversion exit CUNIT, internal->external for field ATAW1
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_RCOMEP-ATAW1
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RCOMEP-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_RCOMEP_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,END OF T_EKKO_STR.
DATA: WA_RCOMEP_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_RCOMEP_STR-MANDT sy-vline 
WA_RCOMEP_STR-MSID sy-vline 
WA_RCOMEP_STR-ATINN sy-vline 
WA_RCOMEP_STR-ATWRT sy-vline 
WA_RCOMEP_STR-ATFLV sy-vline 
WA_RCOMEP_STR-ATFLB sy-vline 
WA_RCOMEP_STR-ATAWE sy-vline 
WA_RCOMEP_STR-ATAW1 sy-vline 
WA_RCOMEP_STR-ATCOD sy-vline 
WA_RCOMEP_STR-ATFOR sy-vline 
WA_RCOMEP_STR-UKZ sy-vline      INTO ld_text SEPARATED BY SPACE.

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