ABAP Select data from SAP table P21_S_ONYF_HEAD into internal table

Get Example source ABAP code based on a different SAP table
  Get ABAP code

Below is a number of ABAP code snippets to demonstrate how to select data from SAP P21_S_ONYF_HEAD 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 P21_S_ONYF_HEAD. 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 P21_S_ONYF_HEAD 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_P21_S_ONYF_HEAD TYPE STANDARD TABLE OF P21_S_ONYF_HEAD,
      WA_P21_S_ONYF_HEAD TYPE P21_S_ONYF_HEAD,
      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: <P21_S_ONYF_HEAD> TYPE P21_S_ONYF_HEAD.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_P21_S_ONYF_HEAD.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM P21_S_ONYF_HEAD
  INTO TABLE IT_P21_S_ONYF_HEAD.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM P21_S_ONYF_HEAD
*  INTO TABLE @DATA(IT_P21_S_ONYF_HEAD2).
*--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_P21_S_ONYF_HEAD INDEX 1 INTO DATA(WA_P21_S_ONYF_HEAD2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_P21_S_ONYF_HEAD ASSIGNING <P21_S_ONYF_HEAD>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<P21_S_ONYF_HEAD>-PERNR = 1.
<P21_S_ONYF_HEAD>-FPERB = 1.
<P21_S_ONYF_HEAD>-FPERE = 1.
<P21_S_ONYF_HEAD>-ENAME = 1.
<P21_S_ONYF_HEAD>-SZULN = 1.

ENDLOOP.

LOOP AT IT_P21_S_ONYF_HEAD INTO WA_P21_S_ONYF_HEAD.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_P21_S_ONYF_HEAD-GESCH, sy-vline,
  WA_P21_S_ONYF_HEAD-GESCT, sy-vline,
  WA_P21_S_ONYF_HEAD-SVNUM, sy-vline,
  WA_P21_S_ONYF_HEAD-GBDAT, sy-vline,
  WA_P21_S_ONYF_HEAD-GBORT, sy-vline,
  WA_P21_S_ONYF_HEAD-MUNAM, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_P21_S_ONYF_HEAD 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_P21_S_ONYF_HEAD 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_P21_S_ONYF_HEAD INTO WA_P21_S_ONYF_HEAD.


*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 PDATE, internal->external for field GBDAT
CALL FUNCTION 'CONVERSION_EXIT_PDATE_OUTPUT'
  EXPORTING
    input =                      WA_P21_S_ONYF_HEAD-GBDAT
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_P21_S_ONYF_HEAD-GBDAT.
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_P21_S_ONYF_HEAD_STR, 
PERNR TYPE STRING,
FPERB TYPE STRING,
FPERE TYPE STRING,
ENAME TYPE STRING,
SZULN TYPE STRING,
GESCH TYPE STRING,
GESCT TYPE STRING,
SVNUM TYPE STRING,
GBDAT TYPE STRING,
GBORT TYPE STRING,
MUNAM TYPE STRING,
TBKOD TYPE STRING,
TBKOT TYPE STRING,
NYAPO TYPE STRING,
NATIO TYPE STRING,
ADOSZ TYPE STRING,
TBTOR TYPE STRING,
FOLYO TYPE STRING,
KFNEV TYPE STRING,
KFCIM TYPE STRING,
TBKIF TYPE STRING,
CSKIF TYPE STRING,
ARSZO TYPE STRING,END OF T_EKKO_STR.
DATA: WA_P21_S_ONYF_HEAD_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_P21_S_ONYF_HEAD_STR-PERNR sy-vline 
WA_P21_S_ONYF_HEAD_STR-FPERB sy-vline 
WA_P21_S_ONYF_HEAD_STR-FPERE sy-vline 
WA_P21_S_ONYF_HEAD_STR-ENAME sy-vline 
WA_P21_S_ONYF_HEAD_STR-SZULN sy-vline 
WA_P21_S_ONYF_HEAD_STR-GESCH sy-vline 
WA_P21_S_ONYF_HEAD_STR-GESCT sy-vline 
WA_P21_S_ONYF_HEAD_STR-SVNUM sy-vline 
WA_P21_S_ONYF_HEAD_STR-GBDAT sy-vline 
WA_P21_S_ONYF_HEAD_STR-GBORT sy-vline 
WA_P21_S_ONYF_HEAD_STR-MUNAM sy-vline 
WA_P21_S_ONYF_HEAD_STR-TBKOD sy-vline 
WA_P21_S_ONYF_HEAD_STR-TBKOT sy-vline 
WA_P21_S_ONYF_HEAD_STR-NYAPO sy-vline 
WA_P21_S_ONYF_HEAD_STR-NATIO sy-vline 
WA_P21_S_ONYF_HEAD_STR-ADOSZ sy-vline 
WA_P21_S_ONYF_HEAD_STR-TBTOR sy-vline 
WA_P21_S_ONYF_HEAD_STR-FOLYO sy-vline 
WA_P21_S_ONYF_HEAD_STR-KFNEV sy-vline 
WA_P21_S_ONYF_HEAD_STR-KFCIM sy-vline 
WA_P21_S_ONYF_HEAD_STR-TBKIF sy-vline 
WA_P21_S_ONYF_HEAD_STR-CSKIF sy-vline 
WA_P21_S_ONYF_HEAD_STR-ARSZO sy-vline      INTO ld_text SEPARATED BY SPACE.

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