ABAP Select data from SAP table RFRRD20 into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP RFRRD20 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 RFRRD20. 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 RFRRD20 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_RFRRD20 TYPE STANDARD TABLE OF RFRRD20,
      WA_RFRRD20 TYPE RFRRD20,
      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: <RFRRD20> TYPE RFRRD20.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_RFRRD20.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM RFRRD20
  INTO TABLE IT_RFRRD20.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM RFRRD20
*  INTO TABLE @DATA(IT_RFRRD202).
*--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_RFRRD20 INDEX 1 INTO DATA(WA_RFRRD202).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_RFRRD20 ASSIGNING <RFRRD20>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<RFRRD20>-STIDA = 1.
<RFRRD20>-KOART = 1.
<RFRRD20>-KUNNR = 1.
<RFRRD20>-LAND1 = 1.
<RFRRD20>-KONZS = 1.

ENDLOOP.

LOOP AT IT_RFRRD20 INTO WA_RFRRD20.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_RFRRD20-BRSCH, sy-vline,
  WA_RFRRD20-BUKRS, sy-vline,
  WA_RFRRD20-BUSAB, sy-vline,
  WA_RFRRD20-FDGRV, sy-vline,
  WA_RFRRD20-GSBER, sy-vline,
  WA_RFRRD20-KKBER, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_RFRRD20 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_RFRRD20 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_RFRRD20 INTO WA_RFRRD20.


*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 KUNNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RFRRD20-KUNNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RFRRD20-KUNNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field FDGRV
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RFRRD20-FDGRV
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RFRRD20-FDGRV.
WRITE:/ 'New Value:', ld_input.

*Conversion exit GJAHR, internal->external for field GJAHR
CALL FUNCTION 'CONVERSION_EXIT_GJAHR_OUTPUT'
  EXPORTING
    input =                      WA_RFRRD20-GJAHR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RFRRD20-GJAHR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit PERI7, internal->external for field PERIO
CALL FUNCTION 'CONVERSION_EXIT_PERI7_OUTPUT'
  EXPORTING
    input =                      WA_RFRRD20-PERIO
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RFRRD20-PERIO.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field BELNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RFRRD20-BELNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RFRRD20-BELNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit AC172, internal->external for field DMSHB
CALL FUNCTION 'CONVERSION_EXIT_AC172_OUTPUT'
  EXPORTING
    input =                      WA_RFRRD20-DMSHB
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RFRRD20-DMSHB.
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_RFRRD20_STR, 
STIDA TYPE STRING,
KOART TYPE STRING,
KUNNR TYPE STRING,
LAND1 TYPE STRING,
KONZS TYPE STRING,
BRSCH TYPE STRING,
BUKRS TYPE STRING,
BUSAB TYPE STRING,
FDGRV TYPE STRING,
GSBER TYPE STRING,
KKBER TYPE STRING,
CTLPC TYPE STRING,
SBGRP TYPE STRING,
BSCHL TYPE STRING,
UMSKZ TYPE STRING,
BLART TYPE STRING,
MANST TYPE STRING,
GJAHR TYPE STRING,
PERDE TYPE STRING,
PERIO TYPE STRING,
BELNR TYPE STRING,
DUE_TYPE TYPE STRING,
VTAGE_NET TYPE STRING,
VTAGE_SK1 TYPE STRING,
VTAGE_SK2 TYPE STRING,
WAERS TYPE STRING,
DMSHB TYPE STRING,END OF T_EKKO_STR.
DATA: WA_RFRRD20_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_RFRRD20_STR-STIDA sy-vline 
WA_RFRRD20_STR-KOART sy-vline 
WA_RFRRD20_STR-KUNNR sy-vline 
WA_RFRRD20_STR-LAND1 sy-vline 
WA_RFRRD20_STR-KONZS sy-vline 
WA_RFRRD20_STR-BRSCH sy-vline 
WA_RFRRD20_STR-BUKRS sy-vline 
WA_RFRRD20_STR-BUSAB sy-vline 
WA_RFRRD20_STR-FDGRV sy-vline 
WA_RFRRD20_STR-GSBER sy-vline 
WA_RFRRD20_STR-KKBER sy-vline 
WA_RFRRD20_STR-CTLPC sy-vline 
WA_RFRRD20_STR-SBGRP sy-vline 
WA_RFRRD20_STR-BSCHL sy-vline 
WA_RFRRD20_STR-UMSKZ sy-vline 
WA_RFRRD20_STR-BLART sy-vline 
WA_RFRRD20_STR-MANST sy-vline 
WA_RFRRD20_STR-GJAHR sy-vline 
WA_RFRRD20_STR-PERDE sy-vline 
WA_RFRRD20_STR-PERIO sy-vline 
WA_RFRRD20_STR-BELNR sy-vline 
WA_RFRRD20_STR-DUE_TYPE sy-vline 
WA_RFRRD20_STR-VTAGE_NET sy-vline 
WA_RFRRD20_STR-VTAGE_SK1 sy-vline 
WA_RFRRD20_STR-VTAGE_SK2 sy-vline 
WA_RFRRD20_STR-WAERS sy-vline 
WA_RFRRD20_STR-DMSHB sy-vline      INTO ld_text SEPARATED BY SPACE.

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