ABAP Select data from SAP table V_PEG_MDRS2 into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP V_PEG_MDRS2 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_PEG_MDRS2. 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_PEG_MDRS2 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_PEG_MDRS2 TYPE STANDARD TABLE OF V_PEG_MDRS2,
      WA_V_PEG_MDRS2 TYPE V_PEG_MDRS2,
      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_PEG_MDRS2> TYPE V_PEG_MDRS2.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_V_PEG_MDRS2.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM V_PEG_MDRS2
  INTO TABLE IT_V_PEG_MDRS2.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM V_PEG_MDRS2
*  INTO TABLE @DATA(IT_V_PEG_MDRS22).
*--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_PEG_MDRS2 INDEX 1 INTO DATA(WA_V_PEG_MDRS22).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_V_PEG_MDRS2 ASSIGNING <V_PEG_MDRS2>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<V_PEG_MDRS2>-MANDT = 1.
<V_PEG_MDRS2>-RSNUM = 1.
<V_PEG_MDRS2>-RSPOS = 1.
<V_PEG_MDRS2>-RSART = 1.
<V_PEG_MDRS2>-BDART = 1.

ENDLOOP.

LOOP AT IT_V_PEG_MDRS2 INTO WA_V_PEG_MDRS2.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_V_PEG_MDRS2-SCHGT, sy-vline,
  WA_V_PEG_MDRS2-TXTPS, sy-vline,
  WA_V_PEG_MDRS2-DUMPS, sy-vline,
  WA_V_PEG_MDRS2-DBSKZ, sy-vline,
  WA_V_PEG_MDRS2-XLOEK, sy-vline,
  WA_V_PEG_MDRS2-KZEAR, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_V_PEG_MDRS2 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_PEG_MDRS2 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_PEG_MDRS2 INTO WA_V_PEG_MDRS2.


*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 MATNR
CALL FUNCTION 'CONVERSION_EXIT_MATN1_OUTPUT'
  EXPORTING
    input =                      WA_V_PEG_MDRS2-MATNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_V_PEG_MDRS2-MATNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit CUNIT, internal->external for field MEINS
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_V_PEG_MDRS2-MEINS
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_V_PEG_MDRS2-MEINS.
WRITE:/ 'New Value:', ld_input.

*Conversion exit MATN1, internal->external for field BAUGR
CALL FUNCTION 'CONVERSION_EXIT_MATN1_OUTPUT'
  EXPORTING
    input =                      WA_V_PEG_MDRS2-BAUGR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_V_PEG_MDRS2-BAUGR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ABPSP, internal->external for field PSPEL
CALL FUNCTION 'CONVERSION_EXIT_ABPSP_OUTPUT'
  EXPORTING
    input =                      WA_V_PEG_MDRS2-PSPEL
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_V_PEG_MDRS2-PSPEL.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field PLNUM
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_V_PEG_MDRS2-PLNUM
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_V_PEG_MDRS2-PLNUM.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field BANFN
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_V_PEG_MDRS2-BANFN
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_V_PEG_MDRS2-BANFN.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field EBELN
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_V_PEG_MDRS2-EBELN
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_V_PEG_MDRS2-EBELN.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field AUFNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_V_PEG_MDRS2-AUFNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_V_PEG_MDRS2-AUFNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit MATN1, internal->external for field NOMAT
CALL FUNCTION 'CONVERSION_EXIT_MATN1_OUTPUT'
  EXPORTING
    input =                      WA_V_PEG_MDRS2-NOMAT
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_V_PEG_MDRS2-NOMAT.
WRITE:/ 'New Value:', ld_input.

*Conversion exit NUMCV, internal->external for field STLNR
CALL FUNCTION 'CONVERSION_EXIT_NUMCV_OUTPUT'
  EXPORTING
    input =                      WA_V_PEG_MDRS2-STLNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_V_PEG_MDRS2-STLNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit CUNIT, internal->external for field ERFME
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_V_PEG_MDRS2-ERFME
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_V_PEG_MDRS2-ERFME.
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_PEG_MDRS2_STR, 
MANDT TYPE STRING,
RSNUM TYPE STRING,
RSPOS TYPE STRING,
RSART TYPE STRING,
BDART TYPE STRING,
SCHGT TYPE STRING,
TXTPS TYPE STRING,
DUMPS TYPE STRING,
DBSKZ TYPE STRING,
XLOEK TYPE STRING,
KZEAR TYPE STRING,
MATNR TYPE STRING,
WERKS TYPE STRING,
CHARG TYPE STRING,
KNTTP TYPE STRING,
SOBKZ TYPE STRING,
KZVBR TYPE STRING,
BDTER TYPE STRING,
BDMNG TYPE STRING,
MEINS TYPE STRING,
SHKZG TYPE STRING,
ENMNG TYPE STRING,
BAUGR TYPE STRING,
KDEIN TYPE STRING,
PSPEL TYPE STRING,
PLNUM TYPE STRING,
BANFN TYPE STRING,
BNFPO TYPE STRING,
EBELN TYPE STRING,
EBELP TYPE STRING,
EBELE TYPE STRING,
AUFNR TYPE STRING,
AUFPS TYPE STRING,
UMWRK TYPE STRING,
KZAUS TYPE STRING,
NFEAG TYPE STRING,
NFGRP TYPE STRING,
NFPKZ TYPE STRING,
NAFKZ TYPE STRING,
NOMNG TYPE STRING,
NOMAT TYPE STRING,
SBTER TYPE STRING,
NDISP TYPE STRING,
STLNR TYPE STRING,
PBDNR TYPE STRING,
UMREZ TYPE STRING,
UMREN TYPE STRING,
ERFME TYPE STRING,
ERFMG TYPE STRING,
VORAB TYPE STRING,
AUFPL TYPE STRING,
APLZL TYPE STRING,END OF T_EKKO_STR.
DATA: WA_V_PEG_MDRS2_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_PEG_MDRS2_STR-MANDT sy-vline 
WA_V_PEG_MDRS2_STR-RSNUM sy-vline 
WA_V_PEG_MDRS2_STR-RSPOS sy-vline 
WA_V_PEG_MDRS2_STR-RSART sy-vline 
WA_V_PEG_MDRS2_STR-BDART sy-vline 
WA_V_PEG_MDRS2_STR-SCHGT sy-vline 
WA_V_PEG_MDRS2_STR-TXTPS sy-vline 
WA_V_PEG_MDRS2_STR-DUMPS sy-vline 
WA_V_PEG_MDRS2_STR-DBSKZ sy-vline 
WA_V_PEG_MDRS2_STR-XLOEK sy-vline 
WA_V_PEG_MDRS2_STR-KZEAR sy-vline 
WA_V_PEG_MDRS2_STR-MATNR sy-vline 
WA_V_PEG_MDRS2_STR-WERKS sy-vline 
WA_V_PEG_MDRS2_STR-CHARG sy-vline 
WA_V_PEG_MDRS2_STR-KNTTP sy-vline 
WA_V_PEG_MDRS2_STR-SOBKZ sy-vline 
WA_V_PEG_MDRS2_STR-KZVBR sy-vline 
WA_V_PEG_MDRS2_STR-BDTER sy-vline 
WA_V_PEG_MDRS2_STR-BDMNG sy-vline 
WA_V_PEG_MDRS2_STR-MEINS sy-vline 
WA_V_PEG_MDRS2_STR-SHKZG sy-vline 
WA_V_PEG_MDRS2_STR-ENMNG sy-vline 
WA_V_PEG_MDRS2_STR-BAUGR sy-vline 
WA_V_PEG_MDRS2_STR-KDEIN sy-vline 
WA_V_PEG_MDRS2_STR-PSPEL sy-vline 
WA_V_PEG_MDRS2_STR-PLNUM sy-vline 
WA_V_PEG_MDRS2_STR-BANFN sy-vline 
WA_V_PEG_MDRS2_STR-BNFPO sy-vline 
WA_V_PEG_MDRS2_STR-EBELN sy-vline 
WA_V_PEG_MDRS2_STR-EBELP sy-vline 
WA_V_PEG_MDRS2_STR-EBELE sy-vline 
WA_V_PEG_MDRS2_STR-AUFNR sy-vline 
WA_V_PEG_MDRS2_STR-AUFPS sy-vline 
WA_V_PEG_MDRS2_STR-UMWRK sy-vline 
WA_V_PEG_MDRS2_STR-KZAUS sy-vline 
WA_V_PEG_MDRS2_STR-NFEAG sy-vline 
WA_V_PEG_MDRS2_STR-NFGRP sy-vline 
WA_V_PEG_MDRS2_STR-NFPKZ sy-vline 
WA_V_PEG_MDRS2_STR-NAFKZ sy-vline 
WA_V_PEG_MDRS2_STR-NOMNG sy-vline 
WA_V_PEG_MDRS2_STR-NOMAT sy-vline 
WA_V_PEG_MDRS2_STR-SBTER sy-vline 
WA_V_PEG_MDRS2_STR-NDISP sy-vline 
WA_V_PEG_MDRS2_STR-STLNR sy-vline 
WA_V_PEG_MDRS2_STR-PBDNR sy-vline 
WA_V_PEG_MDRS2_STR-UMREZ sy-vline 
WA_V_PEG_MDRS2_STR-UMREN sy-vline 
WA_V_PEG_MDRS2_STR-ERFME sy-vline 
WA_V_PEG_MDRS2_STR-ERFMG sy-vline 
WA_V_PEG_MDRS2_STR-VORAB sy-vline 
WA_V_PEG_MDRS2_STR-AUFPL sy-vline 
WA_V_PEG_MDRS2_STR-APLZL sy-vline      INTO ld_text SEPARATED BY SPACE.

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