ABAP Select data from SAP table P2RG_ST into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP P2RG_ST 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 P2RG_ST. 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 P2RG_ST 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_P2RG_ST TYPE STANDARD TABLE OF P2RG_ST,
      WA_P2RG_ST TYPE P2RG_ST,
      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: <P2RG_ST> TYPE P2RG_ST.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_P2RG_ST.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM P2RG_ST
  INTO TABLE IT_P2RG_ST.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM P2RG_ST
*  INTO TABLE @DATA(IT_P2RG_ST2).
*--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_P2RG_ST INDEX 1 INTO DATA(WA_P2RG_ST2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_P2RG_ST ASSIGNING <P2RG_ST>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<P2RG_ST>-MANDT = 1.
<P2RG_ST>-DCT_PERNR = 1.
<P2RG_ST>-DCT_SEQNR = 1.
<P2RG_ST>-BEGDA = 1.
<P2RG_ST>-ENDDA = 1.

ENDLOOP.

LOOP AT IT_P2RG_ST INTO WA_P2RG_ST.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_P2RG_ST-TXNUM, sy-vline,
  WA_P2RG_ST-TXLET, sy-vline,
  WA_P2RG_ST-TXBAS, sy-vline,
  WA_P2RG_ST-TXRFS, sy-vline,
  WA_P2RG_ST-TXSTK, sy-vline,
  WA_P2RG_ST-P45PY_OLD, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_P2RG_ST 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_P2RG_ST 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_P2RG_ST INTO WA_P2RG_ST.


*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.
ENDFORM. 

*&---------------------------------------------------------------------*
*& Form process_as_string_field_values
*&---------------------------------------------------------------------*
FORM process_as_string_field_values CHANGING p_EKKO LIKE wa_EKKO.

TYPES: BEGIN OF T_P2RG_ST_STR, 
MANDT TYPE STRING,
DCT_PERNR TYPE STRING,
DCT_SEQNR TYPE STRING,
BEGDA TYPE STRING,
ENDDA TYPE STRING,
TXNUM TYPE STRING,
TXLET TYPE STRING,
TXBAS TYPE STRING,
TXRFS TYPE STRING,
TXSTK TYPE STRING,
P45PY_OLD TYPE STRING,
P45TX_OLD TYPE STRING,
TXWKN TYPE STRING,
TXMTN TYPE STRING,
CMTPY_OLD TYPE STRING,
CMTXP_OLD TYPE STRING,
TXREG TYPE STRING,
TXNMB TYPE STRING,
TXCOD TYPE STRING,
CUTXC TYPE STRING,
ADJAMT TYPE STRING,
ADJUST TYPE STRING,
MPT TYPE STRING,
MPTGRS TYPE STRING,
MPTTAX TYPE STRING,
CNTXC TYPE STRING,
P45PY TYPE STRING,
P45TX TYPE STRING,
CMTPY TYPE STRING,
CMTXP TYPE STRING,END OF T_EKKO_STR.
DATA: WA_P2RG_ST_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_P2RG_ST_STR-MANDT sy-vline 
WA_P2RG_ST_STR-DCT_PERNR sy-vline 
WA_P2RG_ST_STR-DCT_SEQNR sy-vline 
WA_P2RG_ST_STR-BEGDA sy-vline 
WA_P2RG_ST_STR-ENDDA sy-vline 
WA_P2RG_ST_STR-TXNUM sy-vline 
WA_P2RG_ST_STR-TXLET sy-vline 
WA_P2RG_ST_STR-TXBAS sy-vline 
WA_P2RG_ST_STR-TXRFS sy-vline 
WA_P2RG_ST_STR-TXSTK sy-vline 
WA_P2RG_ST_STR-P45PY_OLD sy-vline 
WA_P2RG_ST_STR-P45TX_OLD sy-vline 
WA_P2RG_ST_STR-TXWKN sy-vline 
WA_P2RG_ST_STR-TXMTN sy-vline 
WA_P2RG_ST_STR-CMTPY_OLD sy-vline 
WA_P2RG_ST_STR-CMTXP_OLD sy-vline 
WA_P2RG_ST_STR-TXREG sy-vline 
WA_P2RG_ST_STR-TXNMB sy-vline 
WA_P2RG_ST_STR-TXCOD sy-vline 
WA_P2RG_ST_STR-CUTXC sy-vline 
WA_P2RG_ST_STR-ADJAMT sy-vline 
WA_P2RG_ST_STR-ADJUST sy-vline 
WA_P2RG_ST_STR-MPT sy-vline 
WA_P2RG_ST_STR-MPTGRS sy-vline 
WA_P2RG_ST_STR-MPTTAX sy-vline 
WA_P2RG_ST_STR-CNTXC sy-vline 
WA_P2RG_ST_STR-P45PY sy-vline 
WA_P2RG_ST_STR-P45TX sy-vline 
WA_P2RG_ST_STR-CMTPY sy-vline 
WA_P2RG_ST_STR-CMTXP sy-vline      INTO ld_text SEPARATED BY SPACE.

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