ABAP Select data from SAP table RC27F into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP RC27F 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 RC27F. 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 RC27F 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_RC27F TYPE STANDARD TABLE OF RC27F,
      WA_RC27F TYPE RC27F,
      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: <RC27F> TYPE RC27F.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_RC27F.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM RC27F
  INTO TABLE IT_RC27F.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM RC27F
*  INTO TABLE @DATA(IT_RC27F2).
*--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_RC27F INDEX 1 INTO DATA(WA_RC27F2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_RC27F ASSIGNING <RC27F>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<RC27F>-SORTL = 1.
<RC27F>-LIFNR = 1.
<RC27F>-APLFZ = 1.
<RC27F>-PREIS = 1.
<RC27F>-PEINH = 1.

ENDLOOP.

LOOP AT IT_RC27F INTO WA_RC27F.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_RC27F-WAERS, sy-vline,
  WA_RC27F-WAGRP, sy-vline,
  WA_RC27F-EKGRP, sy-vline,
  WA_RC27F-MEINS, sy-vline,
  WA_RC27F-NORBM, sy-vline,
ENDLOOP.
   
*Add any further fields from structure WA_RC27F 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_RC27F 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_RC27F INTO WA_RC27F.


*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 LIFNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RC27F-LIFNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RC27F-LIFNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit CUNIT, internal->external for field MEINS
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_RC27F-MEINS
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RC27F-MEINS.
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_RC27F_STR, 
SORTL TYPE STRING,
LIFNR TYPE STRING,
APLFZ TYPE STRING,
PREIS TYPE STRING,
PEINH TYPE STRING,
WAERS TYPE STRING,
WAGRP TYPE STRING,
EKGRP TYPE STRING,
MEINS TYPE STRING,
NORBM TYPE STRING,END OF T_EKKO_STR.
DATA: WA_RC27F_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_RC27F_STR-SORTL sy-vline 
WA_RC27F_STR-LIFNR sy-vline 
WA_RC27F_STR-APLFZ sy-vline 
WA_RC27F_STR-PREIS sy-vline 
WA_RC27F_STR-PEINH sy-vline 
WA_RC27F_STR-WAERS sy-vline 
WA_RC27F_STR-WAGRP sy-vline 
WA_RC27F_STR-EKGRP sy-vline 
WA_RC27F_STR-MEINS sy-vline 
WA_RC27F_STR-NORBM sy-vline      INTO ld_text SEPARATED BY SPACE.

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