ABAP Select data from SAP table RNVV1 into internal table

Get Example source ABAP code based on a different SAP table
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Below is a number of ABAP code snippets to demonstrate how to select data from SAP RNVV1 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 RNVV1. 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 RNVV1 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_RNVV1 TYPE STANDARD TABLE OF RNVV1,
      WA_RNVV1 TYPE RNVV1,
      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: <RNVV1> TYPE RNVV1.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_RNVV1.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM RNVV1
  INTO TABLE IT_RNVV1.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM RNVV1
*  INTO TABLE @DATA(IT_RNVV12).
*--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_RNVV1 INDEX 1 INTO DATA(WA_RNVV12).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_RNVV1 ASSIGNING <RNVV1>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<RNVV1>-MANDT = 1.
<RNVV1>-PATNR = 1.
<RNVV1>-LFDNR = 1.
<RNVV1>-KOSTR = 1.
<RNVV1>-SELKZ = 1.

ENDLOOP.

LOOP AT IT_RNVV1 INTO WA_RNVV1.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_RNVV1-VERNR, sy-vline,
  WA_RNVV1-VERAB, sy-vline,
  WA_RNVV1-VERBI, sy-vline,
  WA_RNVV1-VERGE, sy-vline,
  WA_RNVV1-VERNN, sy-vline,
  WA_RNVV1-VERVN, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_RNVV1 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_RNVV1 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_RNVV1 INTO WA_RNVV1.


*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 PATNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RNVV1-PATNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RNVV1-PATNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field KOSTR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RNVV1-KOSTR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RNVV1-KOSTR.
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_RNVV1_STR, 
MANDT TYPE STRING,
PATNR TYPE STRING,
LFDNR TYPE STRING,
KOSTR TYPE STRING,
SELKZ TYPE STRING,
VERNR TYPE STRING,
VERAB TYPE STRING,
VERBI TYPE STRING,
VERGE TYPE STRING,
VERNN TYPE STRING,
VERVN TYPE STRING,
VERAN TYPE STRING,
VERTI TYPE STRING,
VERNZ TYPE STRING,
VERVW TYPE STRING,
VERGB TYPE STRING,
VERLA TYPE STRING,
VERNA TYPE STRING,
VERPL TYPE STRING,
VEROR TYPE STRING,
VERST TYPE STRING,
VERTE TYPE STRING,
VERSV TYPE STRING,
ABREE TYPE STRING,END OF T_EKKO_STR.
DATA: WA_RNVV1_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_RNVV1_STR-MANDT sy-vline 
WA_RNVV1_STR-PATNR sy-vline 
WA_RNVV1_STR-LFDNR sy-vline 
WA_RNVV1_STR-KOSTR sy-vline 
WA_RNVV1_STR-SELKZ sy-vline 
WA_RNVV1_STR-VERNR sy-vline 
WA_RNVV1_STR-VERAB sy-vline 
WA_RNVV1_STR-VERBI sy-vline 
WA_RNVV1_STR-VERGE sy-vline 
WA_RNVV1_STR-VERNN sy-vline 
WA_RNVV1_STR-VERVN sy-vline 
WA_RNVV1_STR-VERAN sy-vline 
WA_RNVV1_STR-VERTI sy-vline 
WA_RNVV1_STR-VERNZ sy-vline 
WA_RNVV1_STR-VERVW sy-vline 
WA_RNVV1_STR-VERGB sy-vline 
WA_RNVV1_STR-VERLA sy-vline 
WA_RNVV1_STR-VERNA sy-vline 
WA_RNVV1_STR-VERPL sy-vline 
WA_RNVV1_STR-VEROR sy-vline 
WA_RNVV1_STR-VERST sy-vline 
WA_RNVV1_STR-VERTE sy-vline 
WA_RNVV1_STR-VERSV sy-vline 
WA_RNVV1_STR-ABREE sy-vline      INTO ld_text SEPARATED BY SPACE.

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