ABAP Select data from SAP table P2RW_CST into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP P2RW_CST 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 P2RW_CST. 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 P2RW_CST 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_P2RW_CST TYPE STANDARD TABLE OF P2RW_CST,
      WA_P2RW_CST TYPE P2RW_CST,
      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: <P2RW_CST> TYPE P2RW_CST.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_P2RW_CST.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM P2RW_CST
  INTO TABLE IT_P2RW_CST.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM P2RW_CST
*  INTO TABLE @DATA(IT_P2RW_CST2).
*--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_P2RW_CST INDEX 1 INTO DATA(WA_P2RW_CST2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_P2RW_CST ASSIGNING <P2RW_CST>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<P2RW_CST>-MANDT = 1.
<P2RW_CST>-DCT_PERNR = 1.
<P2RW_CST>-DCT_SEQNR = 1.
<P2RW_CST>-DCT_ROWID = 1.
<P2RW_CST>-CNTR2 = 1.

ENDLOOP.

LOOP AT IT_P2RW_CST INTO WA_P2RW_CST.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_P2RW_CST-BEGDA, sy-vline,
  WA_P2RW_CST-ENDDA, sy-vline,
  WA_P2RW_CST-STAT2, sy-vline,
  WA_P2RW_CST-REGIO, sy-vline,
  WA_P2RW_CST-PFIND, sy-vline,
  WA_P2RW_CST-TXSTA, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_P2RW_CST 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_P2RW_CST 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_P2RW_CST INTO WA_P2RW_CST.


*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 GJAHR, internal->external for field DCOMP
CALL FUNCTION 'CONVERSION_EXIT_GJAHR_OUTPUT'
  EXPORTING
    input =                      WA_P2RW_CST-DCOMP
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_P2RW_CST-DCOMP.
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_P2RW_CST_STR, 
MANDT TYPE STRING,
DCT_PERNR TYPE STRING,
DCT_SEQNR TYPE STRING,
DCT_ROWID TYPE STRING,
CNTR2 TYPE STRING,
BEGDA TYPE STRING,
ENDDA TYPE STRING,
STAT2 TYPE STRING,
REGIO TYPE STRING,
PFIND TYPE STRING,
TXSTA TYPE STRING,
NODEP TYPE STRING,
AGIND TYPE STRING,
TXPRO TYPE STRING,
FLEXI TYPE STRING,
DIRPC TYPE STRING,
RBAMT TYPE STRING,
EXAMT TYPE STRING,
NAPER TYPE STRING,
DIRNO TYPE STRING,
REGNO TYPE STRING,
RSCCD TYPE STRING,
NORSC TYPE STRING,
REGNC TYPE STRING,
FOINC TYPE STRING,
DDIRA TYPE STRING,
WAERS TYPE STRING,
DCOMP TYPE STRING,
IRP30 TYPE STRING,
LABRK TYPE STRING,
EXFIN TYPE STRING,
PAYNO TYPE STRING,
UIFNO TYPE STRING,
SDLNO TYPE STRING,
TRVLC TYPE STRING,
DRNUM TYPE STRING,
NEDPC TYPE STRING,END OF T_EKKO_STR.
DATA: WA_P2RW_CST_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_P2RW_CST_STR-MANDT sy-vline 
WA_P2RW_CST_STR-DCT_PERNR sy-vline 
WA_P2RW_CST_STR-DCT_SEQNR sy-vline 
WA_P2RW_CST_STR-DCT_ROWID sy-vline 
WA_P2RW_CST_STR-CNTR2 sy-vline 
WA_P2RW_CST_STR-BEGDA sy-vline 
WA_P2RW_CST_STR-ENDDA sy-vline 
WA_P2RW_CST_STR-STAT2 sy-vline 
WA_P2RW_CST_STR-REGIO sy-vline 
WA_P2RW_CST_STR-PFIND sy-vline 
WA_P2RW_CST_STR-TXSTA sy-vline 
WA_P2RW_CST_STR-NODEP sy-vline 
WA_P2RW_CST_STR-AGIND sy-vline 
WA_P2RW_CST_STR-TXPRO sy-vline 
WA_P2RW_CST_STR-FLEXI sy-vline 
WA_P2RW_CST_STR-DIRPC sy-vline 
WA_P2RW_CST_STR-RBAMT sy-vline 
WA_P2RW_CST_STR-EXAMT sy-vline 
WA_P2RW_CST_STR-NAPER sy-vline 
WA_P2RW_CST_STR-DIRNO sy-vline 
WA_P2RW_CST_STR-REGNO sy-vline 
WA_P2RW_CST_STR-RSCCD sy-vline 
WA_P2RW_CST_STR-NORSC sy-vline 
WA_P2RW_CST_STR-REGNC sy-vline 
WA_P2RW_CST_STR-FOINC sy-vline 
WA_P2RW_CST_STR-DDIRA sy-vline 
WA_P2RW_CST_STR-WAERS sy-vline 
WA_P2RW_CST_STR-DCOMP sy-vline 
WA_P2RW_CST_STR-IRP30 sy-vline 
WA_P2RW_CST_STR-LABRK sy-vline 
WA_P2RW_CST_STR-EXFIN sy-vline 
WA_P2RW_CST_STR-PAYNO sy-vline 
WA_P2RW_CST_STR-UIFNO sy-vline 
WA_P2RW_CST_STR-SDLNO sy-vline 
WA_P2RW_CST_STR-TRVLC sy-vline 
WA_P2RW_CST_STR-DRNUM sy-vline 
WA_P2RW_CST_STR-NEDPC sy-vline      INTO ld_text SEPARATED BY SPACE.

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