ABAP Select data from SAP table FUCN_FIDOC_HEADER_FRONTEND into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM FUCN_FIDOC_HEADER_FRONTEND
*  INTO TABLE @DATA(IT_FUCN_FIDOC_HEADER_FRONTEND2).
*--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_FUCN_FIDOC_HEADER_FRONTEND INDEX 1 INTO DATA(WA_FUCN_FIDOC_HEADER_FRONTEND2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<FUCN_FIDOC_HEADER_FRONTEND>-BUKRS = 1.
<FUCN_FIDOC_HEADER_FRONTEND>-BLDAT = 1.
<FUCN_FIDOC_HEADER_FRONTEND>-XBLNR = 1.
<FUCN_FIDOC_HEADER_FRONTEND>-BUDAT = 1.
<FUCN_FIDOC_HEADER_FRONTEND>-KURSF = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_FUCN_FIDOC_HEADER_FRONTEND-WAERS, sy-vline,
  WA_FUCN_FIDOC_HEADER_FRONTEND-NUMPG, sy-vline,
  WA_FUCN_FIDOC_HEADER_FRONTEND-BLART, sy-vline,
  WA_FUCN_FIDOC_HEADER_FRONTEND-XMWST, sy-vline,
  WA_FUCN_FIDOC_HEADER_FRONTEND-WWERT, sy-vline,
  WA_FUCN_FIDOC_HEADER_FRONTEND-LDGRP, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_FUCN_FIDOC_HEADER_FRONTEND 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_FUCN_FIDOC_HEADER_FRONTEND 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_FUCN_FIDOC_HEADER_FRONTEND INTO WA_FUCN_FIDOC_HEADER_FRONTEND.


*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 EXCRT, internal->external for field KURSF
CALL FUNCTION 'CONVERSION_EXIT_EXCRT_OUTPUT'
  EXPORTING
    input =                      WA_FUCN_FIDOC_HEADER_FRONTEND-KURSF
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_FUCN_FIDOC_HEADER_FRONTEND-KURSF.
WRITE:/ 'New Value:', ld_input.

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

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

*Conversion exit ODNIT, internal->external for field XBLNR_ALT
CALL FUNCTION 'CONVERSION_EXIT_ODNIT_OUTPUT'
  EXPORTING
    input =                      WA_FUCN_FIDOC_HEADER_FRONTEND-XBLNR_ALT
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_FUCN_FIDOC_HEADER_FRONTEND-XBLNR_ALT.
WRITE:/ 'New Value:', ld_input.

*Conversion exit GJAHR, internal->external for field STJAH
CALL FUNCTION 'CONVERSION_EXIT_GJAHR_OUTPUT'
  EXPORTING
    input =                      WA_FUCN_FIDOC_HEADER_FRONTEND-STJAH
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_FUCN_FIDOC_HEADER_FRONTEND-STJAH.
WRITE:/ 'New Value:', ld_input.

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

*Conversion exit ALPHA, internal->external for field VERIDOC_NO
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_FUCN_FIDOC_HEADER_FRONTEND-VERIDOC_NO
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_FUCN_FIDOC_HEADER_FRONTEND-VERIDOC_NO.
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_FUCN_FIDOC_HEADER_FRONTEND_STR, 
BUKRS TYPE STRING,
BLDAT TYPE STRING,
XBLNR TYPE STRING,
BUDAT TYPE STRING,
KURSF TYPE STRING,
WAERS TYPE STRING,
NUMPG TYPE STRING,
BLART TYPE STRING,
XMWST TYPE STRING,
WWERT TYPE STRING,
LDGRP TYPE STRING,
BVORG TYPE STRING,
PARGB TYPE STRING,
MONAT TYPE STRING,
GJAHR TYPE STRING,
STBLG TYPE STRING,
STGRD TYPE STRING,
STODT TYPE STRING,
STOMO TYPE STRING,
XBLNR_ALT TYPE STRING,
STJAH TYPE STRING,
AWTYP TYPE STRING,
TCODE TYPE STRING,
REINDAT TYPE STRING,
AWKEY TYPE STRING,
AWSYS TYPE STRING,
VERIDOC_NO TYPE STRING,
AUTHOR TYPE STRING,
APPROVER TYPE STRING,
DOCVERF_LEVEL TYPE STRING,
BKTXT TYPE STRING,
CURR_DESP TYPE STRING,END OF T_EKKO_STR.
DATA: WA_FUCN_FIDOC_HEADER_FRONTEND_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_FUCN_FIDOC_HEADER_FRONTEND_STR-BUKRS sy-vline 
WA_FUCN_FIDOC_HEADER_FRONTEND_STR-BLDAT sy-vline 
WA_FUCN_FIDOC_HEADER_FRONTEND_STR-XBLNR sy-vline 
WA_FUCN_FIDOC_HEADER_FRONTEND_STR-BUDAT sy-vline 
WA_FUCN_FIDOC_HEADER_FRONTEND_STR-KURSF sy-vline 
WA_FUCN_FIDOC_HEADER_FRONTEND_STR-WAERS sy-vline 
WA_FUCN_FIDOC_HEADER_FRONTEND_STR-NUMPG sy-vline 
WA_FUCN_FIDOC_HEADER_FRONTEND_STR-BLART sy-vline 
WA_FUCN_FIDOC_HEADER_FRONTEND_STR-XMWST sy-vline 
WA_FUCN_FIDOC_HEADER_FRONTEND_STR-WWERT sy-vline 
WA_FUCN_FIDOC_HEADER_FRONTEND_STR-LDGRP sy-vline 
WA_FUCN_FIDOC_HEADER_FRONTEND_STR-BVORG sy-vline 
WA_FUCN_FIDOC_HEADER_FRONTEND_STR-PARGB sy-vline 
WA_FUCN_FIDOC_HEADER_FRONTEND_STR-MONAT sy-vline 
WA_FUCN_FIDOC_HEADER_FRONTEND_STR-GJAHR sy-vline 
WA_FUCN_FIDOC_HEADER_FRONTEND_STR-STBLG sy-vline 
WA_FUCN_FIDOC_HEADER_FRONTEND_STR-STGRD sy-vline 
WA_FUCN_FIDOC_HEADER_FRONTEND_STR-STODT sy-vline 
WA_FUCN_FIDOC_HEADER_FRONTEND_STR-STOMO sy-vline 
WA_FUCN_FIDOC_HEADER_FRONTEND_STR-XBLNR_ALT sy-vline 
WA_FUCN_FIDOC_HEADER_FRONTEND_STR-STJAH sy-vline 
WA_FUCN_FIDOC_HEADER_FRONTEND_STR-AWTYP sy-vline 
WA_FUCN_FIDOC_HEADER_FRONTEND_STR-TCODE sy-vline 
WA_FUCN_FIDOC_HEADER_FRONTEND_STR-REINDAT sy-vline 
WA_FUCN_FIDOC_HEADER_FRONTEND_STR-AWKEY sy-vline 
WA_FUCN_FIDOC_HEADER_FRONTEND_STR-AWSYS sy-vline 
WA_FUCN_FIDOC_HEADER_FRONTEND_STR-VERIDOC_NO sy-vline 
WA_FUCN_FIDOC_HEADER_FRONTEND_STR-AUTHOR sy-vline 
WA_FUCN_FIDOC_HEADER_FRONTEND_STR-APPROVER sy-vline 
WA_FUCN_FIDOC_HEADER_FRONTEND_STR-DOCVERF_LEVEL sy-vline 
WA_FUCN_FIDOC_HEADER_FRONTEND_STR-BKTXT sy-vline 
WA_FUCN_FIDOC_HEADER_FRONTEND_STR-CURR_DESP sy-vline      INTO ld_text SEPARATED BY SPACE.

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