ABAP Select data from SAP table REXCFR_FI_HEADER into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM REXCFR_FI_HEADER
*  INTO TABLE @DATA(IT_REXCFR_FI_HEADER2).
*--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_REXCFR_FI_HEADER INDEX 1 INTO DATA(WA_REXCFR_FI_HEADER2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<REXCFR_FI_HEADER>-BUKRS = 1.
<REXCFR_FI_HEADER>-BELNR = 1.
<REXCFR_FI_HEADER>-GJAHR = 1.
<REXCFR_FI_HEADER>-BUDAT = 1.
<REXCFR_FI_HEADER>-BLDAT = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_REXCFR_FI_HEADER-MONAT, sy-vline,
  WA_REXCFR_FI_HEADER-HWAER, sy-vline,
  WA_REXCFR_FI_HEADER-WWERT, sy-vline,
  WA_REXCFR_FI_HEADER-KURSF, sy-vline,
  WA_REXCFR_FI_HEADER-AWTYP, sy-vline,
  WA_REXCFR_FI_HEADER-AWSYS, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_REXCFR_FI_HEADER 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_REXCFR_FI_HEADER 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_REXCFR_FI_HEADER INTO WA_REXCFR_FI_HEADER.


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

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

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

*Conversion exit ALPHA, internal->external for field AWSYS
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_REXCFR_FI_HEADER-AWSYS
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_REXCFR_FI_HEADER-AWSYS.
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_REXCFR_FI_HEADER_STR, 
BUKRS TYPE STRING,
BELNR TYPE STRING,
GJAHR TYPE STRING,
BUDAT TYPE STRING,
BLDAT TYPE STRING,
MONAT TYPE STRING,
HWAER TYPE STRING,
WWERT TYPE STRING,
KURSF TYPE STRING,
AWTYP TYPE STRING,
AWSYS TYPE STRING,
AWKEY TYPE STRING,
HDR_TXT TYPE STRING,
REVERSAL TYPE STRING,END OF T_EKKO_STR.
DATA: WA_REXCFR_FI_HEADER_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_REXCFR_FI_HEADER_STR-BUKRS sy-vline 
WA_REXCFR_FI_HEADER_STR-BELNR sy-vline 
WA_REXCFR_FI_HEADER_STR-GJAHR sy-vline 
WA_REXCFR_FI_HEADER_STR-BUDAT sy-vline 
WA_REXCFR_FI_HEADER_STR-BLDAT sy-vline 
WA_REXCFR_FI_HEADER_STR-MONAT sy-vline 
WA_REXCFR_FI_HEADER_STR-HWAER sy-vline 
WA_REXCFR_FI_HEADER_STR-WWERT sy-vline 
WA_REXCFR_FI_HEADER_STR-KURSF sy-vline 
WA_REXCFR_FI_HEADER_STR-AWTYP sy-vline 
WA_REXCFR_FI_HEADER_STR-AWSYS sy-vline 
WA_REXCFR_FI_HEADER_STR-AWKEY sy-vline 
WA_REXCFR_FI_HEADER_STR-HDR_TXT sy-vline 
WA_REXCFR_FI_HEADER_STR-REVERSAL sy-vline      INTO ld_text SEPARATED BY SPACE.

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