ABAP Select data from SAP table P21_PS_OKM_ALAP into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP P21_PS_OKM_ALAP 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_PS_OKM_ALAP. 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_PS_OKM_ALAP 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_PS_OKM_ALAP TYPE STANDARD TABLE OF P21_PS_OKM_ALAP,
      WA_P21_PS_OKM_ALAP TYPE P21_PS_OKM_ALAP,
      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_PS_OKM_ALAP> TYPE P21_PS_OKM_ALAP.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_P21_PS_OKM_ALAP.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM P21_PS_OKM_ALAP
  INTO TABLE IT_P21_PS_OKM_ALAP.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM P21_PS_OKM_ALAP
*  INTO TABLE @DATA(IT_P21_PS_OKM_ALAP2).
*--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_PS_OKM_ALAP INDEX 1 INTO DATA(WA_P21_PS_OKM_ALAP2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_P21_PS_OKM_ALAP ASSIGNING <P21_PS_OKM_ALAP>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<P21_PS_OKM_ALAP>-DATUM = 1.
<P21_PS_OKM_ALAP>-TSZ = 1.
<P21_PS_OKM_ALAP>-NEV = 1.
<P21_PS_OKM_ALAP>-VEZ_NEV = 1.
<P21_PS_OKM_ALAP>-VEZ2_NEV = 1.

ENDLOOP.

LOOP AT IT_P21_PS_OKM_ALAP INTO WA_P21_PS_OKM_ALAP.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_P21_PS_OKM_ALAP-UTONEV, sy-vline,
  WA_P21_PS_OKM_ALAP-FORMAT_NEV, sy-vline,
  WA_P21_PS_OKM_ALAP-SZUL_HELY, sy-vline,
  WA_P21_PS_OKM_ALAP-SZUL_IDO, sy-vline,
  WA_P21_PS_OKM_ALAP-NEME, sy-vline,
  WA_P21_PS_OKM_ALAP-ANYJA_NEVE, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_P21_PS_OKM_ALAP 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_PS_OKM_ALAP 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_PS_OKM_ALAP INTO WA_P21_PS_OKM_ALAP.


*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 SZUL_IDO
CALL FUNCTION 'CONVERSION_EXIT_PDATE_OUTPUT'
  EXPORTING
    input =                      WA_P21_PS_OKM_ALAP-SZUL_IDO
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_P21_PS_OKM_ALAP-SZUL_IDO.
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_PS_OKM_ALAP_STR, 
DATUM TYPE STRING,
TSZ TYPE STRING,
NEV TYPE STRING,
VEZ_NEV TYPE STRING,
VEZ2_NEV TYPE STRING,
UTONEV TYPE STRING,
FORMAT_NEV TYPE STRING,
SZUL_HELY TYPE STRING,
SZUL_IDO TYPE STRING,
NEME TYPE STRING,
ANYJA_NEVE TYPE STRING,
ANYJA_VEZ_NEV TYPE STRING,
ANYJA_UTONEV TYPE STRING,
SZUL_NEVE TYPE STRING,
TAJ TYPE STRING,
ALLAMPOLG TYPE STRING,
ADOAZONOSITO TYPE STRING,
SZIG TYPE STRING,
POZICIO TYPE STRING,
POZICIO_KOD TYPE STRING,
MUNKAKOR TYPE STRING,
MUNKAKOR_KOD TYPE STRING,
SZERV_EGYS TYPE STRING,
SZERV_EGYS_KOD TYPE STRING,
VALLALAT TYPE STRING,
VALLALAT_KOD TYPE STRING,
VALLALAT_ADOSZ TYPE STRING,
SZEM_TER_KOD TYPE STRING,
SZEM_TER TYPE STRING,
SZEM_RESZTER_KOD TYPE STRING,
SZEM_RESZTER TYPE STRING,
SZEM_CSOP_KOD TYPE STRING,
SZEM_CSOP TYPE STRING,
SZEM_KOR_KOD TYPE STRING,
SZEM_KOR TYPE STRING,
ALK_VISZ_KOD TYPE STRING,
ALK_VISZ TYPE STRING,
FEOR_KOD TYPE STRING,
FEOR TYPE STRING,
FEOR_KIEG_KOD TYPE STRING,
FEOR_KIEG TYPE STRING,
AGAZATKOZI_KOD TYPE STRING,
AGAZATKOZI TYPE STRING,
AGAZATI_KOD TYPE STRING,
AGAZATI TYPE STRING,
STATISZTIKAI_KOD TYPE STRING,
STATISZTIKAI TYPE STRING,
FOGLALK_MOD_KOD TYPE STRING,
FOGLALK_MOD TYPE STRING,
MEGYEKOD TYPE STRING,
MEGYE TYPE STRING,
HELYEG_KOD TYPE STRING,
HELYSEG TYPE STRING,
KORKEDV_MUNKAKOR TYPE STRING,END OF T_EKKO_STR.
DATA: WA_P21_PS_OKM_ALAP_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_PS_OKM_ALAP_STR-DATUM sy-vline 
WA_P21_PS_OKM_ALAP_STR-TSZ sy-vline 
WA_P21_PS_OKM_ALAP_STR-NEV sy-vline 
WA_P21_PS_OKM_ALAP_STR-VEZ_NEV sy-vline 
WA_P21_PS_OKM_ALAP_STR-VEZ2_NEV sy-vline 
WA_P21_PS_OKM_ALAP_STR-UTONEV sy-vline 
WA_P21_PS_OKM_ALAP_STR-FORMAT_NEV sy-vline 
WA_P21_PS_OKM_ALAP_STR-SZUL_HELY sy-vline 
WA_P21_PS_OKM_ALAP_STR-SZUL_IDO sy-vline 
WA_P21_PS_OKM_ALAP_STR-NEME sy-vline 
WA_P21_PS_OKM_ALAP_STR-ANYJA_NEVE sy-vline 
WA_P21_PS_OKM_ALAP_STR-ANYJA_VEZ_NEV sy-vline 
WA_P21_PS_OKM_ALAP_STR-ANYJA_UTONEV sy-vline 
WA_P21_PS_OKM_ALAP_STR-SZUL_NEVE sy-vline 
WA_P21_PS_OKM_ALAP_STR-TAJ sy-vline 
WA_P21_PS_OKM_ALAP_STR-ALLAMPOLG sy-vline 
WA_P21_PS_OKM_ALAP_STR-ADOAZONOSITO sy-vline 
WA_P21_PS_OKM_ALAP_STR-SZIG sy-vline 
WA_P21_PS_OKM_ALAP_STR-POZICIO sy-vline 
WA_P21_PS_OKM_ALAP_STR-POZICIO_KOD sy-vline 
WA_P21_PS_OKM_ALAP_STR-MUNKAKOR sy-vline 
WA_P21_PS_OKM_ALAP_STR-MUNKAKOR_KOD sy-vline 
WA_P21_PS_OKM_ALAP_STR-SZERV_EGYS sy-vline 
WA_P21_PS_OKM_ALAP_STR-SZERV_EGYS_KOD sy-vline 
WA_P21_PS_OKM_ALAP_STR-VALLALAT sy-vline 
WA_P21_PS_OKM_ALAP_STR-VALLALAT_KOD sy-vline 
WA_P21_PS_OKM_ALAP_STR-VALLALAT_ADOSZ sy-vline 
WA_P21_PS_OKM_ALAP_STR-SZEM_TER_KOD sy-vline 
WA_P21_PS_OKM_ALAP_STR-SZEM_TER sy-vline 
WA_P21_PS_OKM_ALAP_STR-SZEM_RESZTER_KOD sy-vline 
WA_P21_PS_OKM_ALAP_STR-SZEM_RESZTER sy-vline 
WA_P21_PS_OKM_ALAP_STR-SZEM_CSOP_KOD sy-vline 
WA_P21_PS_OKM_ALAP_STR-SZEM_CSOP sy-vline 
WA_P21_PS_OKM_ALAP_STR-SZEM_KOR_KOD sy-vline 
WA_P21_PS_OKM_ALAP_STR-SZEM_KOR sy-vline 
WA_P21_PS_OKM_ALAP_STR-ALK_VISZ_KOD sy-vline 
WA_P21_PS_OKM_ALAP_STR-ALK_VISZ sy-vline 
WA_P21_PS_OKM_ALAP_STR-FEOR_KOD sy-vline 
WA_P21_PS_OKM_ALAP_STR-FEOR sy-vline 
WA_P21_PS_OKM_ALAP_STR-FEOR_KIEG_KOD sy-vline 
WA_P21_PS_OKM_ALAP_STR-FEOR_KIEG sy-vline 
WA_P21_PS_OKM_ALAP_STR-AGAZATKOZI_KOD sy-vline 
WA_P21_PS_OKM_ALAP_STR-AGAZATKOZI sy-vline 
WA_P21_PS_OKM_ALAP_STR-AGAZATI_KOD sy-vline 
WA_P21_PS_OKM_ALAP_STR-AGAZATI sy-vline 
WA_P21_PS_OKM_ALAP_STR-STATISZTIKAI_KOD sy-vline 
WA_P21_PS_OKM_ALAP_STR-STATISZTIKAI sy-vline 
WA_P21_PS_OKM_ALAP_STR-FOGLALK_MOD_KOD sy-vline 
WA_P21_PS_OKM_ALAP_STR-FOGLALK_MOD sy-vline 
WA_P21_PS_OKM_ALAP_STR-MEGYEKOD sy-vline 
WA_P21_PS_OKM_ALAP_STR-MEGYE sy-vline 
WA_P21_PS_OKM_ALAP_STR-HELYEG_KOD sy-vline 
WA_P21_PS_OKM_ALAP_STR-HELYSEG sy-vline 
WA_P21_PS_OKM_ALAP_STR-KORKEDV_MUNKAKOR sy-vline      INTO ld_text SEPARATED BY SPACE.

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