ABAP Select data from SAP table RN221 into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP RN221 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 RN221. 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 RN221 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_RN221 TYPE STANDARD TABLE OF RN221,
      WA_RN221 TYPE RN221,
      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: <RN221> TYPE RN221.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_RN221.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM RN221
  INTO TABLE IT_RN221.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM RN221
*  INTO TABLE @DATA(IT_RN2212).
*--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_RN221 INDEX 1 INTO DATA(WA_RN2212).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_RN221 ASSIGNING <RN221>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<RN221>-SOLFD = 1.
<RN221>-MANDT = 1.
<RN221>-EINRI = 1.
<RN221>-MARK = 1.
<RN221>-PKAT = 1.

ENDLOOP.

LOOP AT IT_RN221 INTO WA_RN221.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_RN221-KATKB, sy-vline,
  WA_RN221-PKEY, sy-vline,
  WA_RN221-PKTXT, sy-vline,
  WA_RN221-PTEXT, sy-vline,
  WA_RN221-GKAT, sy-vline,
  WA_RN221-GKEY, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_RN221 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_RN221 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_RN221 INTO WA_RN221.


*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 EINRI
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RN221-EINRI
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RN221-EINRI.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field PKAT
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RN221-PKAT
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RN221-PKAT.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field GKAT
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RN221-GKAT
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RN221-GKAT.
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_RN221_STR, 
SOLFD TYPE STRING,
MANDT TYPE STRING,
EINRI TYPE STRING,
MARK TYPE STRING,
PKAT TYPE STRING,
KATKB TYPE STRING,
PKEY TYPE STRING,
PKTXT TYPE STRING,
PTEXT TYPE STRING,
GKAT TYPE STRING,
GKEY TYPE STRING,
GTEXT TYPE STRING,
POAKT TYPE STRING,
POGES TYPE STRING,
N1INVALID TYPE STRING,END OF T_EKKO_STR.
DATA: WA_RN221_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_RN221_STR-SOLFD sy-vline 
WA_RN221_STR-MANDT sy-vline 
WA_RN221_STR-EINRI sy-vline 
WA_RN221_STR-MARK sy-vline 
WA_RN221_STR-PKAT sy-vline 
WA_RN221_STR-KATKB sy-vline 
WA_RN221_STR-PKEY sy-vline 
WA_RN221_STR-PKTXT sy-vline 
WA_RN221_STR-PTEXT sy-vline 
WA_RN221_STR-GKAT sy-vline 
WA_RN221_STR-GKEY sy-vline 
WA_RN221_STR-GTEXT sy-vline 
WA_RN221_STR-POAKT sy-vline 
WA_RN221_STR-POGES sy-vline 
WA_RN221_STR-N1INVALID sy-vline      INTO ld_text SEPARATED BY SPACE.

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