ABAP Select data from SAP table V_RS_PG into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM V_RS_PG
*  INTO TABLE @DATA(IT_V_RS_PG2).
*--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_V_RS_PG INDEX 1 INTO DATA(WA_V_RS_PG2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<V_RS_PG>-MANDT = 1.
<V_RS_PG>-PGTYP = 1.
<V_RS_PG>-PRGRP = 1.
<V_RS_PG>-WERKS = 1.
<V_RS_PG>-NRMIT = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_V_RS_PG-WEMIT, sy-vline,
  WA_V_RS_PG-DATUM, sy-vline,
  WA_V_RS_PG-VSNDA, sy-vline,
  WA_V_RS_PG-VERID, sy-vline,
  WA_V_RS_PG-SERKZ, sy-vline,
  WA_V_RS_PG-ADATU, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_V_RS_PG 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_V_RS_PG 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_V_RS_PG INTO WA_V_RS_PG.


*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 MATN1, internal->external for field PRGRP
CALL FUNCTION 'CONVERSION_EXIT_MATN1_OUTPUT'
  EXPORTING
    input =                      WA_V_RS_PG-PRGRP
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_V_RS_PG-PRGRP.
WRITE:/ 'New Value:', ld_input.

*Conversion exit MATN1, internal->external for field NRMIT
CALL FUNCTION 'CONVERSION_EXIT_MATN1_OUTPUT'
  EXPORTING
    input =                      WA_V_RS_PG-NRMIT
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_V_RS_PG-NRMIT.
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_V_RS_PG_STR, 
MANDT TYPE STRING,
PGTYP TYPE STRING,
PRGRP TYPE STRING,
WERKS TYPE STRING,
NRMIT TYPE STRING,
WEMIT TYPE STRING,
DATUM TYPE STRING,
VSNDA TYPE STRING,
VERID TYPE STRING,
SERKZ TYPE STRING,
ADATU TYPE STRING,
BDATU TYPE STRING,
SAUFT TYPE STRING,
DISPO TYPE STRING,
SFEPR TYPE STRING,END OF T_EKKO_STR.
DATA: WA_V_RS_PG_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_V_RS_PG_STR-MANDT sy-vline 
WA_V_RS_PG_STR-PGTYP sy-vline 
WA_V_RS_PG_STR-PRGRP sy-vline 
WA_V_RS_PG_STR-WERKS sy-vline 
WA_V_RS_PG_STR-NRMIT sy-vline 
WA_V_RS_PG_STR-WEMIT sy-vline 
WA_V_RS_PG_STR-DATUM sy-vline 
WA_V_RS_PG_STR-VSNDA sy-vline 
WA_V_RS_PG_STR-VERID sy-vline 
WA_V_RS_PG_STR-SERKZ sy-vline 
WA_V_RS_PG_STR-ADATU sy-vline 
WA_V_RS_PG_STR-BDATU sy-vline 
WA_V_RS_PG_STR-SAUFT sy-vline 
WA_V_RS_PG_STR-DISPO sy-vline 
WA_V_RS_PG_STR-SFEPR sy-vline      INTO ld_text SEPARATED BY SPACE.

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