ABAP Select data from SAP table RNFFZZ into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM RNFFZZ
*  INTO TABLE @DATA(IT_RNFFZZ2).
*--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_RNFFZZ INDEX 1 INTO DATA(WA_RNFFZZ2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<RNFFZZ>-MANDT = 1.
<RNFFZZ>-EINRI = 1.
<RNFFZZ>-FALN1 = 1.
<RNFFZZ>-FALN2 = 1.
<RNFFZZ>-ENDDT = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_RNFFZZ-BEGDT, sy-vline,
  WA_RNFFZZ-REFA1, sy-vline,
  WA_RNFFZZ-REFA2, sy-vline,
  WA_RNFFZZ-KZTXT, sy-vline,
  WA_RNFFZZ-LGTXT, sy-vline,
  WA_RNFFZZ-STORN, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_RNFFZZ 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_RNFFZZ 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_RNFFZZ INTO WA_RNFFZZ.


*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_RNFFZZ-EINRI
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RNFFZZ-EINRI.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field FALN1
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RNFFZZ-FALN1
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RNFFZZ-FALN1.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field FALN2
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RNFFZZ-FALN2
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RNFFZZ-FALN2.
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_RNFFZZ_STR, 
MANDT TYPE STRING,
EINRI TYPE STRING,
FALN1 TYPE STRING,
FALN2 TYPE STRING,
ENDDT TYPE STRING,
BEGDT TYPE STRING,
REFA1 TYPE STRING,
REFA2 TYPE STRING,
KZTXT TYPE STRING,
LGTXT TYPE STRING,
STORN TYPE STRING,
STUSR TYPE STRING,
STDAT TYPE STRING,
ERDAT TYPE STRING,
ERUSR TYPE STRING,
UPDAT TYPE STRING,
UPUSR TYPE STRING,
REFTI TYPE STRING,
REFTX TYPE STRING,
FAL12 TYPE STRING,
FZIFF TYPE STRING,
PNAME TYPE STRING,
PKZ TYPE STRING,
LOEPH TYPE STRING,END OF T_EKKO_STR.
DATA: WA_RNFFZZ_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_RNFFZZ_STR-MANDT sy-vline 
WA_RNFFZZ_STR-EINRI sy-vline 
WA_RNFFZZ_STR-FALN1 sy-vline 
WA_RNFFZZ_STR-FALN2 sy-vline 
WA_RNFFZZ_STR-ENDDT sy-vline 
WA_RNFFZZ_STR-BEGDT sy-vline 
WA_RNFFZZ_STR-REFA1 sy-vline 
WA_RNFFZZ_STR-REFA2 sy-vline 
WA_RNFFZZ_STR-KZTXT sy-vline 
WA_RNFFZZ_STR-LGTXT sy-vline 
WA_RNFFZZ_STR-STORN sy-vline 
WA_RNFFZZ_STR-STUSR sy-vline 
WA_RNFFZZ_STR-STDAT sy-vline 
WA_RNFFZZ_STR-ERDAT sy-vline 
WA_RNFFZZ_STR-ERUSR sy-vline 
WA_RNFFZZ_STR-UPDAT sy-vline 
WA_RNFFZZ_STR-UPUSR sy-vline 
WA_RNFFZZ_STR-REFTI sy-vline 
WA_RNFFZZ_STR-REFTX sy-vline 
WA_RNFFZZ_STR-FAL12 sy-vline 
WA_RNFFZZ_STR-FZIFF sy-vline 
WA_RNFFZZ_STR-PNAME sy-vline 
WA_RNFFZZ_STR-PKZ sy-vline 
WA_RNFFZZ_STR-LOEPH sy-vline      INTO ld_text SEPARATED BY SPACE.

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