ABAP Select data from SAP table P2RN_AK into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP P2RN_AK 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 P2RN_AK. 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 P2RN_AK 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_P2RN_AK TYPE STANDARD TABLE OF P2RN_AK,
      WA_P2RN_AK TYPE P2RN_AK,
      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: <P2RN_AK> TYPE P2RN_AK.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_P2RN_AK.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM P2RN_AK
  INTO TABLE IT_P2RN_AK.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM P2RN_AK
*  INTO TABLE @DATA(IT_P2RN_AK2).
*--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_P2RN_AK INDEX 1 INTO DATA(WA_P2RN_AK2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_P2RN_AK ASSIGNING <P2RN_AK>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<P2RN_AK>-MANDT = 1.
<P2RN_AK>-DCT_PERNR = 1.
<P2RN_AK>-DCT_SEQNR = 1.
<P2RN_AK>-DCT_ROWID = 1.
<P2RN_AK>-BEGDA = 1.

ENDLOOP.

LOOP AT IT_P2RN_AK INTO WA_P2RN_AK.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_P2RN_AK-ENDDA, sy-vline,
  WA_P2RN_AK-DLNLL, sy-vline,
  WA_P2RN_AK-DLNLW, sy-vline,
  WA_P2RN_AK-DATLW, sy-vline,
  WA_P2RN_AK-KENTLW, sy-vline,
  WA_P2RN_AK-DLNOW, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_P2RN_AK 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_P2RN_AK 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_P2RN_AK INTO WA_P2RN_AK.


*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_P2RN_AK_STR, 
MANDT TYPE STRING,
DCT_PERNR TYPE STRING,
DCT_SEQNR TYPE STRING,
DCT_ROWID TYPE STRING,
BEGDA TYPE STRING,
ENDDA TYPE STRING,
DLNLL TYPE STRING,
DLNLW TYPE STRING,
DATLW TYPE STRING,
KENTLW TYPE STRING,
DLNOW TYPE STRING,
DATOW TYPE STRING,
KENTOW TYPE STRING,
TTSOW TYPE STRING,
DSTLL TYPE STRING,
DATLL TYPE STRING,
KENTLL TYPE STRING,
SKNOW TYPE STRING,
KENTSKNOW TYPE STRING,
DABOV TYPE STRING,
URBOV TYPE STRING,
VGBOV TYPE STRING,
EHBOV_UR TYPE STRING,
EHBOV_VG TYPE STRING,
DATBOV TYPE STRING,
KENTBOV TYPE STRING,
DVMBO TYPE STRING,
PVMBO TYPE STRING,
DSTAG TYPE STRING,
DLEVC TYPE STRING,
DTEVC TYPE STRING,
PSTAG TYPE STRING,
DLINC TYPE STRING,
DTINC TYPE STRING,END OF T_EKKO_STR.
DATA: WA_P2RN_AK_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_P2RN_AK_STR-MANDT sy-vline 
WA_P2RN_AK_STR-DCT_PERNR sy-vline 
WA_P2RN_AK_STR-DCT_SEQNR sy-vline 
WA_P2RN_AK_STR-DCT_ROWID sy-vline 
WA_P2RN_AK_STR-BEGDA sy-vline 
WA_P2RN_AK_STR-ENDDA sy-vline 
WA_P2RN_AK_STR-DLNLL sy-vline 
WA_P2RN_AK_STR-DLNLW sy-vline 
WA_P2RN_AK_STR-DATLW sy-vline 
WA_P2RN_AK_STR-KENTLW sy-vline 
WA_P2RN_AK_STR-DLNOW sy-vline 
WA_P2RN_AK_STR-DATOW sy-vline 
WA_P2RN_AK_STR-KENTOW sy-vline 
WA_P2RN_AK_STR-TTSOW sy-vline 
WA_P2RN_AK_STR-DSTLL sy-vline 
WA_P2RN_AK_STR-DATLL sy-vline 
WA_P2RN_AK_STR-KENTLL sy-vline 
WA_P2RN_AK_STR-SKNOW sy-vline 
WA_P2RN_AK_STR-KENTSKNOW sy-vline 
WA_P2RN_AK_STR-DABOV sy-vline 
WA_P2RN_AK_STR-URBOV sy-vline 
WA_P2RN_AK_STR-VGBOV sy-vline 
WA_P2RN_AK_STR-EHBOV_UR sy-vline 
WA_P2RN_AK_STR-EHBOV_VG sy-vline 
WA_P2RN_AK_STR-DATBOV sy-vline 
WA_P2RN_AK_STR-KENTBOV sy-vline 
WA_P2RN_AK_STR-DVMBO sy-vline 
WA_P2RN_AK_STR-PVMBO sy-vline 
WA_P2RN_AK_STR-DSTAG sy-vline 
WA_P2RN_AK_STR-DLEVC sy-vline 
WA_P2RN_AK_STR-DTEVC sy-vline 
WA_P2RN_AK_STR-PSTAG sy-vline 
WA_P2RN_AK_STR-DLINC sy-vline 
WA_P2RN_AK_STR-DTINC sy-vline      INTO ld_text SEPARATED BY SPACE.

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