ABAP Select data from SAP table PC20N into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP PC20N 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 PC20N. 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 PC20N 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_PC20N TYPE STANDARD TABLE OF PC20N,
      WA_PC20N TYPE PC20N,
      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: <PC20N> TYPE PC20N.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_PC20N.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM PC20N
  INTO TABLE IT_PC20N.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM PC20N
*  INTO TABLE @DATA(IT_PC20N2).
*--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_PC20N INDEX 1 INTO DATA(WA_PC20N2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_PC20N ASSIGNING <PC20N>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<PC20N>-CNTR1 = 1.
<PC20N>-BEGDA = 1.
<PC20N>-ENDDA = 1.
<PC20N>-JUPER = 1.
<PC20N>-KVKZ1 = 1.

ENDLOOP.

LOOP AT IT_PC20N INTO WA_PC20N.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_PC20N-RVKZ1, sy-vline,
  WA_PC20N-AVKZ1, sy-vline,
  WA_PC20N-RVNUM, sy-vline,
  WA_PC20N-KVSFR, sy-vline,
  WA_PC20N-KVGST, sy-vline,
  WA_PC20N-KVBKL, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_PC20N 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_PC20N 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_PC20N INTO WA_PC20N.


*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_PC20N_STR, 
CNTR1 TYPE STRING,
BEGDA TYPE STRING,
ENDDA TYPE STRING,
JUPER TYPE STRING,
KVKZ1 TYPE STRING,
RVKZ1 TYPE STRING,
AVKZ1 TYPE STRING,
RVNUM TYPE STRING,
KVSFR TYPE STRING,
KVGST TYPE STRING,
KVBKL TYPE STRING,
KVFBT TYPE STRING,
ZUSKA TYPE STRING,
SONKV TYPE STRING,
SONRV TYPE STRING,
SONAV TYPE STRING,
SELKV TYPE STRING,
SELRV TYPE STRING,
MITNR TYPE STRING,
MAXKV TYPE STRING,
KVBAT TYPE STRING,
RVBAT TYPE STRING,
AVBAT TYPE STRING,
SVA01 TYPE STRING,
SVA02 TYPE STRING,
SVA03 TYPE STRING,
SVA04 TYPE STRING,
SVA05 TYPE STRING,
SVA06 TYPE STRING,
SVA07 TYPE STRING,
SVA08 TYPE STRING,
PVKZ1 TYPE STRING,
PVBKL TYPE STRING,
PVFBT TYPE STRING,
SONPV TYPE STRING,
SELPV TYPE STRING,
PVBAT TYPE STRING,
MAXPV TYPE STRING,END OF T_EKKO_STR.
DATA: WA_PC20N_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_PC20N_STR-CNTR1 sy-vline 
WA_PC20N_STR-BEGDA sy-vline 
WA_PC20N_STR-ENDDA sy-vline 
WA_PC20N_STR-JUPER sy-vline 
WA_PC20N_STR-KVKZ1 sy-vline 
WA_PC20N_STR-RVKZ1 sy-vline 
WA_PC20N_STR-AVKZ1 sy-vline 
WA_PC20N_STR-RVNUM sy-vline 
WA_PC20N_STR-KVSFR sy-vline 
WA_PC20N_STR-KVGST sy-vline 
WA_PC20N_STR-KVBKL sy-vline 
WA_PC20N_STR-KVFBT sy-vline 
WA_PC20N_STR-ZUSKA sy-vline 
WA_PC20N_STR-SONKV sy-vline 
WA_PC20N_STR-SONRV sy-vline 
WA_PC20N_STR-SONAV sy-vline 
WA_PC20N_STR-SELKV sy-vline 
WA_PC20N_STR-SELRV sy-vline 
WA_PC20N_STR-MITNR sy-vline 
WA_PC20N_STR-MAXKV sy-vline 
WA_PC20N_STR-KVBAT sy-vline 
WA_PC20N_STR-RVBAT sy-vline 
WA_PC20N_STR-AVBAT sy-vline 
WA_PC20N_STR-SVA01 sy-vline 
WA_PC20N_STR-SVA02 sy-vline 
WA_PC20N_STR-SVA03 sy-vline 
WA_PC20N_STR-SVA04 sy-vline 
WA_PC20N_STR-SVA05 sy-vline 
WA_PC20N_STR-SVA06 sy-vline 
WA_PC20N_STR-SVA07 sy-vline 
WA_PC20N_STR-SVA08 sy-vline 
WA_PC20N_STR-PVKZ1 sy-vline 
WA_PC20N_STR-PVBKL sy-vline 
WA_PC20N_STR-PVFBT sy-vline 
WA_PC20N_STR-SONPV sy-vline 
WA_PC20N_STR-SELPV sy-vline 
WA_PC20N_STR-PVBAT sy-vline 
WA_PC20N_STR-MAXPV sy-vline      INTO ld_text SEPARATED BY SPACE.

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