ABAP Select data from SAP table RCOREL into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM RCOREL
*  INTO TABLE @DATA(IT_RCOREL2).
*--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_RCOREL INDEX 1 INTO DATA(WA_RCOREL2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<RCOREL>-MANDT = 1.
<RCOREL>-ATINN = 1.
<RCOREL>-ATNAM = 1.
<RCOREL>-ATFOR = 1.
<RCOREL>-ANZST = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_RCOREL-ANZDZ, sy-vline,
  WA_RCOREL-ATVOR, sy-vline,
  WA_RCOREL-ATSCH, sy-vline,
  WA_RCOREL-ATKON, sy-vline,
  WA_RCOREL-ATKLA, sy-vline,
  WA_RCOREL-ATBEZ, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_RCOREL 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_RCOREL 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_RCOREL INTO WA_RCOREL.


*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_RCOREL-ATINN
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RCOREL-ATINN.
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_RCOREL_STR, 
MANDT TYPE STRING,
ATINN TYPE STRING,
ATNAM TYPE STRING,
ATFOR TYPE STRING,
ANZST TYPE STRING,
ANZDZ TYPE STRING,
ATVOR TYPE STRING,
ATSCH TYPE STRING,
ATKON TYPE STRING,
ATKLA TYPE STRING,
ATBEZ TYPE STRING,
ATUE1 TYPE STRING,
ATUE2 TYPE STRING,
VKEY TYPE STRING,
HKEY TYPE STRING,
KZHL TYPE STRING,
SORTNR TYPE STRING,
VERDOP TYPE STRING,
SELBD TYPE STRING,END OF T_EKKO_STR.
DATA: WA_RCOREL_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_RCOREL_STR-MANDT sy-vline 
WA_RCOREL_STR-ATINN sy-vline 
WA_RCOREL_STR-ATNAM sy-vline 
WA_RCOREL_STR-ATFOR sy-vline 
WA_RCOREL_STR-ANZST sy-vline 
WA_RCOREL_STR-ANZDZ sy-vline 
WA_RCOREL_STR-ATVOR sy-vline 
WA_RCOREL_STR-ATSCH sy-vline 
WA_RCOREL_STR-ATKON sy-vline 
WA_RCOREL_STR-ATKLA sy-vline 
WA_RCOREL_STR-ATBEZ sy-vline 
WA_RCOREL_STR-ATUE1 sy-vline 
WA_RCOREL_STR-ATUE2 sy-vline 
WA_RCOREL_STR-VKEY sy-vline 
WA_RCOREL_STR-HKEY sy-vline 
WA_RCOREL_STR-KZHL sy-vline 
WA_RCOREL_STR-SORTNR sy-vline 
WA_RCOREL_STR-VERDOP sy-vline 
WA_RCOREL_STR-SELBD sy-vline      INTO ld_text SEPARATED BY SPACE.

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