ABAP Select data from SAP table OBJECT_KEYFIELDS into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM OBJECT_KEYFIELDS
*  INTO TABLE @DATA(IT_OBJECT_KEYFIELDS2).
*--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_OBJECT_KEYFIELDS INDEX 1 INTO DATA(WA_OBJECT_KEYFIELDS2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<OBJECT_KEYFIELDS>-AENNR = 1.
<OBJECT_KEYFIELDS>-DOKAR = 1.
<OBJECT_KEYFIELDS>-DOKNR = 1.
<OBJECT_KEYFIELDS>-DOKTL = 1.
<OBJECT_KEYFIELDS>-DOKVR = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_OBJECT_KEYFIELDS-EQUNR, sy-vline,
  WA_OBJECT_KEYFIELDS-MATNR, sy-vline,
  WA_OBJECT_KEYFIELDS-TPLNR, sy-vline,
  WA_OBJECT_KEYFIELDS-ATNAM, sy-vline,
  WA_OBJECT_KEYFIELDS-KLART, sy-vline,
  WA_OBJECT_KEYFIELDS-CLASS, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_OBJECT_KEYFIELDS 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_OBJECT_KEYFIELDS 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_OBJECT_KEYFIELDS INTO WA_OBJECT_KEYFIELDS.


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

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

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

*Conversion exit MATN1, internal->external for field MATNR
CALL FUNCTION 'CONVERSION_EXIT_MATN1_OUTPUT'
  EXPORTING
    input =                      WA_OBJECT_KEYFIELDS-MATNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_OBJECT_KEYFIELDS-MATNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit TPLNR, internal->external for field TPLNR
CALL FUNCTION 'CONVERSION_EXIT_TPLNR_OUTPUT'
  EXPORTING
    input =                      WA_OBJECT_KEYFIELDS-TPLNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_OBJECT_KEYFIELDS-TPLNR.
WRITE:/ 'New Value:', ld_input.

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

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

*Conversion exit ABPSP, internal->external for field PSPNR
CALL FUNCTION 'CONVERSION_EXIT_ABPSP_OUTPUT'
  EXPORTING
    input =                      WA_OBJECT_KEYFIELDS-PSPNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_OBJECT_KEYFIELDS-PSPNR.
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_OBJECT_KEYFIELDS_STR, 
AENNR TYPE STRING,
DOKAR TYPE STRING,
DOKNR TYPE STRING,
DOKTL TYPE STRING,
DOKVR TYPE STRING,
EQUNR TYPE STRING,
MATNR TYPE STRING,
TPLNR TYPE STRING,
ATNAM TYPE STRING,
KLART TYPE STRING,
CLASS TYPE STRING,
WERKS TYPE STRING,
STLAN TYPE STRING,
STLAL TYPE STRING,
VBELN TYPE STRING,
VBPOS TYPE STRING,
PSPNR TYPE STRING,
PRODUCT_ID TYPE STRING,
FOLDER_ID TYPE STRING,
BASELINE_ID TYPE STRING,
LC_PHASE TYPE STRING,END OF T_EKKO_STR.
DATA: WA_OBJECT_KEYFIELDS_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_OBJECT_KEYFIELDS_STR-AENNR sy-vline 
WA_OBJECT_KEYFIELDS_STR-DOKAR sy-vline 
WA_OBJECT_KEYFIELDS_STR-DOKNR sy-vline 
WA_OBJECT_KEYFIELDS_STR-DOKTL sy-vline 
WA_OBJECT_KEYFIELDS_STR-DOKVR sy-vline 
WA_OBJECT_KEYFIELDS_STR-EQUNR sy-vline 
WA_OBJECT_KEYFIELDS_STR-MATNR sy-vline 
WA_OBJECT_KEYFIELDS_STR-TPLNR sy-vline 
WA_OBJECT_KEYFIELDS_STR-ATNAM sy-vline 
WA_OBJECT_KEYFIELDS_STR-KLART sy-vline 
WA_OBJECT_KEYFIELDS_STR-CLASS sy-vline 
WA_OBJECT_KEYFIELDS_STR-WERKS sy-vline 
WA_OBJECT_KEYFIELDS_STR-STLAN sy-vline 
WA_OBJECT_KEYFIELDS_STR-STLAL sy-vline 
WA_OBJECT_KEYFIELDS_STR-VBELN sy-vline 
WA_OBJECT_KEYFIELDS_STR-VBPOS sy-vline 
WA_OBJECT_KEYFIELDS_STR-PSPNR sy-vline 
WA_OBJECT_KEYFIELDS_STR-PRODUCT_ID sy-vline 
WA_OBJECT_KEYFIELDS_STR-FOLDER_ID sy-vline 
WA_OBJECT_KEYFIELDS_STR-BASELINE_ID sy-vline 
WA_OBJECT_KEYFIELDS_STR-LC_PHASE sy-vline      INTO ld_text SEPARATED BY SPACE.

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