ABAP Select data from SAP table FUCN_REVERSE_LOG into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP FUCN_REVERSE_LOG 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_REVERSE_LOG. 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_REVERSE_LOG 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_REVERSE_LOG TYPE STANDARD TABLE OF FUCN_REVERSE_LOG,
      WA_FUCN_REVERSE_LOG TYPE FUCN_REVERSE_LOG,
      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_REVERSE_LOG> TYPE FUCN_REVERSE_LOG.

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM FUCN_REVERSE_LOG
*  INTO TABLE @DATA(IT_FUCN_REVERSE_LOG2).
*--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_REVERSE_LOG INDEX 1 INTO DATA(WA_FUCN_REVERSE_LOG2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<FUCN_REVERSE_LOG>-STATUS = 1.
<FUCN_REVERSE_LOG>-BELNR = 1.
<FUCN_REVERSE_LOG>-BUKRS = 1.
<FUCN_REVERSE_LOG>-GJAHR = 1.
<FUCN_REVERSE_LOG>-BLART = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_FUCN_REVERSE_LOG-BUDAT, sy-vline,
  WA_FUCN_REVERSE_LOG-BLDAT, sy-vline,
  WA_FUCN_REVERSE_LOG-MESSAGE, sy-vline,
  WA_FUCN_REVERSE_LOG-MSG_ID, sy-vline,
  WA_FUCN_REVERSE_LOG-STBLG, sy-vline,
  WA_FUCN_REVERSE_LOG-MSG_TYPE, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_FUCN_REVERSE_LOG 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_REVERSE_LOG 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_REVERSE_LOG INTO WA_FUCN_REVERSE_LOG.


*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_FUCN_REVERSE_LOG-BELNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_FUCN_REVERSE_LOG-BELNR.
WRITE:/ 'New Value:', ld_input.

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

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

*Conversion exit ALPHA, internal->external for field VERIDOC_NO
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_FUCN_REVERSE_LOG-VERIDOC_NO
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_FUCN_REVERSE_LOG-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_REVERSE_LOG_STR, 
STATUS TYPE STRING,
BELNR TYPE STRING,
BUKRS TYPE STRING,
GJAHR TYPE STRING,
BLART TYPE STRING,
BUDAT TYPE STRING,
BLDAT TYPE STRING,
MESSAGE TYPE STRING,
MSG_ID TYPE STRING,
STBLG TYPE STRING,
MSG_TYPE TYPE STRING,
ACTIVE_FLG TYPE STRING,
REVERSE_DOC TYPE STRING,
VERIDOC_NO TYPE STRING,END OF T_EKKO_STR.
DATA: WA_FUCN_REVERSE_LOG_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_REVERSE_LOG_STR-STATUS sy-vline 
WA_FUCN_REVERSE_LOG_STR-BELNR sy-vline 
WA_FUCN_REVERSE_LOG_STR-BUKRS sy-vline 
WA_FUCN_REVERSE_LOG_STR-GJAHR sy-vline 
WA_FUCN_REVERSE_LOG_STR-BLART sy-vline 
WA_FUCN_REVERSE_LOG_STR-BUDAT sy-vline 
WA_FUCN_REVERSE_LOG_STR-BLDAT sy-vline 
WA_FUCN_REVERSE_LOG_STR-MESSAGE sy-vline 
WA_FUCN_REVERSE_LOG_STR-MSG_ID sy-vline 
WA_FUCN_REVERSE_LOG_STR-STBLG sy-vline 
WA_FUCN_REVERSE_LOG_STR-MSG_TYPE sy-vline 
WA_FUCN_REVERSE_LOG_STR-ACTIVE_FLG sy-vline 
WA_FUCN_REVERSE_LOG_STR-REVERSE_DOC sy-vline 
WA_FUCN_REVERSE_LOG_STR-VERIDOC_NO sy-vline      INTO ld_text SEPARATED BY SPACE.

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