ABAP Select data from SAP table P2CN_PI into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP P2CN_PI 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 P2CN_PI. 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 P2CN_PI 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_P2CN_PI TYPE STANDARD TABLE OF P2CN_PI,
      WA_P2CN_PI TYPE P2CN_PI,
      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: <P2CN_PI> TYPE P2CN_PI.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_P2CN_PI.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM P2CN_PI
  INTO TABLE IT_P2CN_PI.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM P2CN_PI
*  INTO TABLE @DATA(IT_P2CN_PI2).
*--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_P2CN_PI INDEX 1 INTO DATA(WA_P2CN_PI2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_P2CN_PI ASSIGNING <P2CN_PI>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<P2CN_PI>-MANDT = 1.
<P2CN_PI>-DCT_PERNR = 1.
<P2CN_PI>-DCT_SEQNR = 1.
<P2CN_PI>-DCT_ROWID = 1.
<P2CN_PI>-BEGDA = 1.

ENDLOOP.

LOOP AT IT_P2CN_PI INTO WA_P2CN_PI.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_P2CN_PI-ENDDA, sy-vline,
  WA_P2CN_PI-INNUM, sy-vline,
  WA_P2CN_PI-CONAR, sy-vline,
  WA_P2CN_PI-CONTY, sy-vline,
  WA_P2CN_PI-CONGR, sy-vline,
  WA_P2CN_PI-CONLV, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_P2CN_PI 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_P2CN_PI 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_P2CN_PI INTO WA_P2CN_PI.


*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_P2CN_PI_STR, 
MANDT TYPE STRING,
DCT_PERNR TYPE STRING,
DCT_SEQNR TYPE STRING,
DCT_ROWID TYPE STRING,
BEGDA TYPE STRING,
ENDDA TYPE STRING,
INNUM TYPE STRING,
CONAR TYPE STRING,
CONTY TYPE STRING,
CONGR TYPE STRING,
CONLV TYPE STRING,
PBYER TYPE STRING,
EEIND TYPE STRING,
EERAT TYPE STRING,
EECON TYPE STRING,
ECCUR TYPE STRING,
EELOW TYPE STRING,
EELCU TYPE STRING,
EEHIG TYPE STRING,
EEHCU TYPE STRING,
ERIND TYPE STRING,
ERRAT TYPE STRING,
ERCON TYPE STRING,
RCCUR TYPE STRING,
ERLOW TYPE STRING,
ERLCU TYPE STRING,
ERHIG TYPE STRING,
ERHCU TYPE STRING,
MOCON TYPE STRING,
PITAX TYPE STRING,
PASSR TYPE STRING,
EEBSR TYPE STRING,
EECOR TYPE STRING,
EEWGE TYPE STRING,
ERBSR TYPE STRING,
ERCOR TYPE STRING,
ERWGE TYPE STRING,
ERDIF TYPE STRING,
EMRAT TYPE STRING,
EMMTP TYPE STRING,
EMAVG TYPE STRING,
EXMTH TYPE STRING,
EERAT3 TYPE STRING,
ERRAT3 TYPE STRING,
EEEMP TYPE STRING,
EEECU TYPE STRING,
EREMP TYPE STRING,
ERECU TYPE STRING,
MOSAS TYPE STRING,
EXMPT_RATE_EE TYPE STRING,
EXMPT_RATE_ER TYPE STRING,
DIFF_EXMPT_EE_ER TYPE STRING,
EXBSR TYPE STRING,
EXCOR TYPE STRING,
EMPFG TYPE STRING,
EMPAR TYPE STRING,
EMPBR TYPE STRING,
EMPGR TYPE STRING,
EMPLV TYPE STRING,
EERT4 TYPE STRING,
ERRT4 TYPE STRING,END OF T_EKKO_STR.
DATA: WA_P2CN_PI_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_P2CN_PI_STR-MANDT sy-vline 
WA_P2CN_PI_STR-DCT_PERNR sy-vline 
WA_P2CN_PI_STR-DCT_SEQNR sy-vline 
WA_P2CN_PI_STR-DCT_ROWID sy-vline 
WA_P2CN_PI_STR-BEGDA sy-vline 
WA_P2CN_PI_STR-ENDDA sy-vline 
WA_P2CN_PI_STR-INNUM sy-vline 
WA_P2CN_PI_STR-CONAR sy-vline 
WA_P2CN_PI_STR-CONTY sy-vline 
WA_P2CN_PI_STR-CONGR sy-vline 
WA_P2CN_PI_STR-CONLV sy-vline 
WA_P2CN_PI_STR-PBYER sy-vline 
WA_P2CN_PI_STR-EEIND sy-vline 
WA_P2CN_PI_STR-EERAT sy-vline 
WA_P2CN_PI_STR-EECON sy-vline 
WA_P2CN_PI_STR-ECCUR sy-vline 
WA_P2CN_PI_STR-EELOW sy-vline 
WA_P2CN_PI_STR-EELCU sy-vline 
WA_P2CN_PI_STR-EEHIG sy-vline 
WA_P2CN_PI_STR-EEHCU sy-vline 
WA_P2CN_PI_STR-ERIND sy-vline 
WA_P2CN_PI_STR-ERRAT sy-vline 
WA_P2CN_PI_STR-ERCON sy-vline 
WA_P2CN_PI_STR-RCCUR sy-vline 
WA_P2CN_PI_STR-ERLOW sy-vline 
WA_P2CN_PI_STR-ERLCU sy-vline 
WA_P2CN_PI_STR-ERHIG sy-vline 
WA_P2CN_PI_STR-ERHCU sy-vline 
WA_P2CN_PI_STR-MOCON sy-vline 
WA_P2CN_PI_STR-PITAX sy-vline 
WA_P2CN_PI_STR-PASSR sy-vline 
WA_P2CN_PI_STR-EEBSR sy-vline 
WA_P2CN_PI_STR-EECOR sy-vline 
WA_P2CN_PI_STR-EEWGE sy-vline 
WA_P2CN_PI_STR-ERBSR sy-vline 
WA_P2CN_PI_STR-ERCOR sy-vline 
WA_P2CN_PI_STR-ERWGE sy-vline 
WA_P2CN_PI_STR-ERDIF sy-vline 
WA_P2CN_PI_STR-EMRAT sy-vline 
WA_P2CN_PI_STR-EMMTP sy-vline 
WA_P2CN_PI_STR-EMAVG sy-vline 
WA_P2CN_PI_STR-EXMTH sy-vline 
WA_P2CN_PI_STR-EERAT3 sy-vline 
WA_P2CN_PI_STR-ERRAT3 sy-vline 
WA_P2CN_PI_STR-EEEMP sy-vline 
WA_P2CN_PI_STR-EEECU sy-vline 
WA_P2CN_PI_STR-EREMP sy-vline 
WA_P2CN_PI_STR-ERECU sy-vline 
WA_P2CN_PI_STR-MOSAS sy-vline 
WA_P2CN_PI_STR-EXMPT_RATE_EE sy-vline 
WA_P2CN_PI_STR-EXMPT_RATE_ER sy-vline 
WA_P2CN_PI_STR-DIFF_EXMPT_EE_ER sy-vline 
WA_P2CN_PI_STR-EXBSR sy-vline 
WA_P2CN_PI_STR-EXCOR sy-vline 
WA_P2CN_PI_STR-EMPFG sy-vline 
WA_P2CN_PI_STR-EMPAR sy-vline 
WA_P2CN_PI_STR-EMPBR sy-vline 
WA_P2CN_PI_STR-EMPGR sy-vline 
WA_P2CN_PI_STR-EMPLV sy-vline 
WA_P2CN_PI_STR-EERT4 sy-vline 
WA_P2CN_PI_STR-ERRT4 sy-vline      INTO ld_text SEPARATED BY SPACE.

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