ABAP Select data from SAP table RNVVF into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM RNVVF
*  INTO TABLE @DATA(IT_RNVVF2).
*--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_RNVVF INDEX 1 INTO DATA(WA_RNVVF2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<RNVVF>-MANDT = 1.
<RNVVF>-EINRI = 1.
<RNVVF>-FALNR = 1.
<RNVVF>-LFDNR = 1.
<RNVVF>-KOSTR = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_RNVVF-AKTKZ, sy-vline,
  WA_RNVVF-PFLZZ, sy-vline,
  WA_RNVVF-NZZGR, sy-vline,
  WA_RNVVF-BTRZZ, sy-vline,
  WA_RNVVF-KZTXT, sy-vline,
  WA_RNVVF-LGTXT, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_RNVVF 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_RNVVF 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_RNVVF INTO WA_RNVVF.


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

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

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

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

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

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

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

*Conversion exit ALPHA, internal->external for field CPDKT
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RNVVF-CPDKT
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RNVVF-CPDKT.
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_RNVVF_STR, 
MANDT TYPE STRING,
EINRI TYPE STRING,
FALNR TYPE STRING,
LFDNR TYPE STRING,
KOSTR TYPE STRING,
AKTKZ TYPE STRING,
PFLZZ TYPE STRING,
NZZGR TYPE STRING,
BTRZZ TYPE STRING,
KZTXT TYPE STRING,
LGTXT TYPE STRING,
LOEKZ TYPE STRING,
LOUSR TYPE STRING,
LODAT TYPE STRING,
ERDAT TYPE STRING,
ERUSR TYPE STRING,
UPDAT TYPE STRING,
UPUSR TYPE STRING,
STORN TYPE STRING,
STUSR TYPE STRING,
STDAT TYPE STRING,
RANGF TYPE STRING,
KVDAT TYPE STRING,
VCEND TYPE STRING,
VTRTY TYPE STRING,
VKVST TYPE STRING,
VKVSE TYPE STRING,
VKNRA TYPE STRING,
VKNUM TYPE STRING,
VKMAN TYPE STRING,
VERNR TYPE STRING,
KKFAL TYPE STRING,
VBGDT TYPE STRING,
REPAP TYPE STRING,
VTAGE TYPE STRING,
VTDAT TYPE STRING,
ADRNR TYPE STRING,
CPDKT TYPE STRING,
STREA TYPE STRING,
PAYAM TYPE STRING,
WAERS TYPE STRING,
EXTTY TYPE STRING,
TWKTR TYPE STRING,
APSTATE TYPE STRING,
KUAUS TYPE STRING,END OF T_EKKO_STR.
DATA: WA_RNVVF_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_RNVVF_STR-MANDT sy-vline 
WA_RNVVF_STR-EINRI sy-vline 
WA_RNVVF_STR-FALNR sy-vline 
WA_RNVVF_STR-LFDNR sy-vline 
WA_RNVVF_STR-KOSTR sy-vline 
WA_RNVVF_STR-AKTKZ sy-vline 
WA_RNVVF_STR-PFLZZ sy-vline 
WA_RNVVF_STR-NZZGR sy-vline 
WA_RNVVF_STR-BTRZZ sy-vline 
WA_RNVVF_STR-KZTXT sy-vline 
WA_RNVVF_STR-LGTXT sy-vline 
WA_RNVVF_STR-LOEKZ sy-vline 
WA_RNVVF_STR-LOUSR sy-vline 
WA_RNVVF_STR-LODAT sy-vline 
WA_RNVVF_STR-ERDAT sy-vline 
WA_RNVVF_STR-ERUSR sy-vline 
WA_RNVVF_STR-UPDAT sy-vline 
WA_RNVVF_STR-UPUSR sy-vline 
WA_RNVVF_STR-STORN sy-vline 
WA_RNVVF_STR-STUSR sy-vline 
WA_RNVVF_STR-STDAT sy-vline 
WA_RNVVF_STR-RANGF sy-vline 
WA_RNVVF_STR-KVDAT sy-vline 
WA_RNVVF_STR-VCEND sy-vline 
WA_RNVVF_STR-VTRTY sy-vline 
WA_RNVVF_STR-VKVST sy-vline 
WA_RNVVF_STR-VKVSE sy-vline 
WA_RNVVF_STR-VKNRA sy-vline 
WA_RNVVF_STR-VKNUM sy-vline 
WA_RNVVF_STR-VKMAN sy-vline 
WA_RNVVF_STR-VERNR sy-vline 
WA_RNVVF_STR-KKFAL sy-vline 
WA_RNVVF_STR-VBGDT sy-vline 
WA_RNVVF_STR-REPAP sy-vline 
WA_RNVVF_STR-VTAGE sy-vline 
WA_RNVVF_STR-VTDAT sy-vline 
WA_RNVVF_STR-ADRNR sy-vline 
WA_RNVVF_STR-CPDKT sy-vline 
WA_RNVVF_STR-STREA sy-vline 
WA_RNVVF_STR-PAYAM sy-vline 
WA_RNVVF_STR-WAERS sy-vline 
WA_RNVVF_STR-EXTTY sy-vline 
WA_RNVVF_STR-TWKTR sy-vline 
WA_RNVVF_STR-APSTATE sy-vline 
WA_RNVVF_STR-KUAUS sy-vline      INTO ld_text SEPARATED BY SPACE.

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