ABAP Select data from SAP table GPKO into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM GPKO
*  INTO TABLE @DATA(IT_GPKO2).
*--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_GPKO INDEX 1 INTO DATA(WA_GPKO2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<GPKO>-MANDT = 1.
<GPKO>-PLNTY = 1.
<GPKO>-PLNNR = 1.
<GPKO>-PLNAL = 1.
<GPKO>-STATU = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_GPKO-LOSVN, sy-vline,
  WA_GPKO-LOSBS, sy-vline,
  WA_GPKO-VAGRP, sy-vline,
  WA_GPKO-VERWE, sy-vline,
  WA_GPKO-AEDAT, sy-vline,
  WA_GPKO-AENAM, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_GPKO 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_GPKO 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_GPKO INTO WA_GPKO.


*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 PLNNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_GPKO-PLNNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_GPKO-PLNNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field PLNAL
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_GPKO-PLNAL
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_GPKO-PLNAL.
WRITE:/ 'New Value:', ld_input.

*Conversion exit CUNIT, internal->external for field PLNME
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_GPKO-PLNME
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_GPKO-PLNME.
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_GPKO_STR, 
MANDT TYPE STRING,
PLNTY TYPE STRING,
PLNNR TYPE STRING,
PLNAL TYPE STRING,
STATU TYPE STRING,
LOSVN TYPE STRING,
LOSBS TYPE STRING,
VAGRP TYPE STRING,
VERWE TYPE STRING,
AEDAT TYPE STRING,
AENAM TYPE STRING,
ANNAM TYPE STRING,
KTEXT TYPE STRING,
PLNME TYPE STRING,
WERKS TYPE STRING,
BMSCH TYPE STRING,
PLOBJ TYPE STRING,
GSTRU TYPE STRING,
TTRAS TYPE STRING,
STFNA TYPE STRING,
FLGLO TYPE STRING,END OF T_EKKO_STR.
DATA: WA_GPKO_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_GPKO_STR-MANDT sy-vline 
WA_GPKO_STR-PLNTY sy-vline 
WA_GPKO_STR-PLNNR sy-vline 
WA_GPKO_STR-PLNAL sy-vline 
WA_GPKO_STR-STATU sy-vline 
WA_GPKO_STR-LOSVN sy-vline 
WA_GPKO_STR-LOSBS sy-vline 
WA_GPKO_STR-VAGRP sy-vline 
WA_GPKO_STR-VERWE sy-vline 
WA_GPKO_STR-AEDAT sy-vline 
WA_GPKO_STR-AENAM sy-vline 
WA_GPKO_STR-ANNAM sy-vline 
WA_GPKO_STR-KTEXT sy-vline 
WA_GPKO_STR-PLNME sy-vline 
WA_GPKO_STR-WERKS sy-vline 
WA_GPKO_STR-BMSCH sy-vline 
WA_GPKO_STR-PLOBJ sy-vline 
WA_GPKO_STR-GSTRU sy-vline 
WA_GPKO_STR-TTRAS sy-vline 
WA_GPKO_STR-STFNA sy-vline 
WA_GPKO_STR-FLGLO sy-vline      INTO ld_text SEPARATED BY SPACE.

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