ABAP Select data from SAP table PLKO_DI_DS into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM PLKO_DI_DS
*  INTO TABLE @DATA(IT_PLKO_DI_DS2).
*--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_PLKO_DI_DS INDEX 1 INTO DATA(WA_PLKO_DI_DS2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<PLKO_DI_DS>-RECTY = 1.
<PLKO_DI_DS>-ACTTYP = 1.
<PLKO_DI_DS>-PLNAL = 1.
<PLKO_DI_DS>-VERWE = 1.
<PLKO_DI_DS>-WERKS = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_PLKO_DI_DS-STATU, sy-vline,
  WA_PLKO_DI_DS-PLNME, sy-vline,
  WA_PLKO_DI_DS-LOSVN, sy-vline,
  WA_PLKO_DI_DS-LOSBS, sy-vline,
  WA_PLKO_DI_DS-VAGRP, sy-vline,
  WA_PLKO_DI_DS-KTEXT, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_PLKO_DI_DS 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_PLKO_DI_DS 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_PLKO_DI_DS INTO WA_PLKO_DI_DS.


*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 ALPHA, internal->external for field PLNAL
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_PLKO_DI_DS-PLNAL
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_PLKO_DI_DS-PLNAL.
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_PLKO_DI_DS_STR, 
RECTY TYPE STRING,
ACTTYP TYPE STRING,
PLNAL TYPE STRING,
VERWE TYPE STRING,
WERKS TYPE STRING,
STATU TYPE STRING,
PLNME TYPE STRING,
LOSVN TYPE STRING,
LOSBS TYPE STRING,
VAGRP TYPE STRING,
KTEXT TYPE STRING,
TXTSP TYPE STRING,
QDYNREGEL TYPE STRING,
QDYNHEAD TYPE STRING,END OF T_EKKO_STR.
DATA: WA_PLKO_DI_DS_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_PLKO_DI_DS_STR-RECTY sy-vline 
WA_PLKO_DI_DS_STR-ACTTYP sy-vline 
WA_PLKO_DI_DS_STR-PLNAL sy-vline 
WA_PLKO_DI_DS_STR-VERWE sy-vline 
WA_PLKO_DI_DS_STR-WERKS sy-vline 
WA_PLKO_DI_DS_STR-STATU sy-vline 
WA_PLKO_DI_DS_STR-PLNME sy-vline 
WA_PLKO_DI_DS_STR-LOSVN sy-vline 
WA_PLKO_DI_DS_STR-LOSBS sy-vline 
WA_PLKO_DI_DS_STR-VAGRP sy-vline 
WA_PLKO_DI_DS_STR-KTEXT sy-vline 
WA_PLKO_DI_DS_STR-TXTSP sy-vline 
WA_PLKO_DI_DS_STR-QDYNREGEL sy-vline 
WA_PLKO_DI_DS_STR-QDYNHEAD sy-vline      INTO ld_text SEPARATED BY SPACE.

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