ABAP Select data from SAP table FKKOPW_GFN into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM FKKOPW_GFN
*  INTO TABLE @DATA(IT_FKKOPW_GFN2).
*--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_FKKOPW_GFN INDEX 1 INTO DATA(WA_FKKOPW_GFN2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<FKKOPW_GFN>-CADOCUMENTNUMBER = 1.
<FKKOPW_GFN>-CAREPETITIONGROUP = 1.
<FKKOPW_GFN>-CAREPETITIONITEMNUMBER = 1.
<FKKOPW_GFN>-CANMBROFITEMSINREPETITIONGRP = 1.
<FKKOPW_GFN>-BUSINESSPARTNER = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_FKKOPW_GFN-CONTRACTACCOUNT, sy-vline,
  WA_FKKOPW_GFN-CASUBSTITUTEDOCUMENTNUMBER, sy-vline,
  WA_FKKOPW_GFN-CASUBSTITUTEDOCUMENTCATEGORY, sy-vline,
  WA_FKKOPW_GFN-CAPOSTINGDATE, sy-vline,
  WA_FKKOPW_GFN-CANETDUEDATE, sy-vline,
  WA_FKKOPW_GFN-CACASHDISCOUNTDUEDATE, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_FKKOPW_GFN 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_FKKOPW_GFN 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_FKKOPW_GFN INTO WA_FKKOPW_GFN.


*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.
ENDFORM. 

*&---------------------------------------------------------------------*
*& Form process_as_string_field_values
*&---------------------------------------------------------------------*
FORM process_as_string_field_values CHANGING p_EKKO LIKE wa_EKKO.

TYPES: BEGIN OF T_FKKOPW_GFN_STR, 
CADOCUMENTNUMBER TYPE STRING,
CAREPETITIONGROUP TYPE STRING,
CAREPETITIONITEMNUMBER TYPE STRING,
CANMBROFITEMSINREPETITIONGRP TYPE STRING,
BUSINESSPARTNER TYPE STRING,
CONTRACTACCOUNT TYPE STRING,
CASUBSTITUTEDOCUMENTNUMBER TYPE STRING,
CASUBSTITUTEDOCUMENTCATEGORY TYPE STRING,
CAPOSTINGDATE TYPE STRING,
CANETDUEDATE TYPE STRING,
CACASHDISCOUNTDUEDATE TYPE STRING,
CAPERIODCODE TYPE STRING,
CACHANGEISFORBIDDEN TYPE STRING,
CADUNNINGLOCKREASON TYPE STRING,
CACLEARINGDATE TYPE STRING,
CACLEARINGDOCUMENTNUMBER TYPE STRING,
CAPOSTINGDATEOFCLEARINGDOC TYPE STRING,
CACLEARINGREASON TYPE STRING,
CAVALUEDATEFORCLEARING TYPE STRING,
CAITEMISWITHDRAWN TYPE STRING,
CAREPETITIONITEMISRESOLVED TYPE STRING,
CACLEARINGPOSTINGISRESET TYPE STRING,
CAPAYMENTPRENOTIFICATIONCODE TYPE STRING,
CAPAYMENTPROCESSINGSTATUS TYPE STRING,END OF T_EKKO_STR.
DATA: WA_FKKOPW_GFN_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_FKKOPW_GFN_STR-CADOCUMENTNUMBER sy-vline 
WA_FKKOPW_GFN_STR-CAREPETITIONGROUP sy-vline 
WA_FKKOPW_GFN_STR-CAREPETITIONITEMNUMBER sy-vline 
WA_FKKOPW_GFN_STR-CANMBROFITEMSINREPETITIONGRP sy-vline 
WA_FKKOPW_GFN_STR-BUSINESSPARTNER sy-vline 
WA_FKKOPW_GFN_STR-CONTRACTACCOUNT sy-vline 
WA_FKKOPW_GFN_STR-CASUBSTITUTEDOCUMENTNUMBER sy-vline 
WA_FKKOPW_GFN_STR-CASUBSTITUTEDOCUMENTCATEGORY sy-vline 
WA_FKKOPW_GFN_STR-CAPOSTINGDATE sy-vline 
WA_FKKOPW_GFN_STR-CANETDUEDATE sy-vline 
WA_FKKOPW_GFN_STR-CACASHDISCOUNTDUEDATE sy-vline 
WA_FKKOPW_GFN_STR-CAPERIODCODE sy-vline 
WA_FKKOPW_GFN_STR-CACHANGEISFORBIDDEN sy-vline 
WA_FKKOPW_GFN_STR-CADUNNINGLOCKREASON sy-vline 
WA_FKKOPW_GFN_STR-CACLEARINGDATE sy-vline 
WA_FKKOPW_GFN_STR-CACLEARINGDOCUMENTNUMBER sy-vline 
WA_FKKOPW_GFN_STR-CAPOSTINGDATEOFCLEARINGDOC sy-vline 
WA_FKKOPW_GFN_STR-CACLEARINGREASON sy-vline 
WA_FKKOPW_GFN_STR-CAVALUEDATEFORCLEARING sy-vline 
WA_FKKOPW_GFN_STR-CAITEMISWITHDRAWN sy-vline 
WA_FKKOPW_GFN_STR-CAREPETITIONITEMISRESOLVED sy-vline 
WA_FKKOPW_GFN_STR-CACLEARINGPOSTINGISRESET sy-vline 
WA_FKKOPW_GFN_STR-CAPAYMENTPRENOTIFICATIONCODE sy-vline 
WA_FKKOPW_GFN_STR-CAPAYMENTPROCESSINGSTATUS sy-vline      INTO ld_text SEPARATED BY SPACE.

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