ABAP Select data from SAP table FKKINVDOC_REV_FREE_SEL into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM FKKINVDOC_REV_FREE_SEL
*  INTO TABLE @DATA(IT_FKKINVDOC_REV_FREE_SEL2).
*--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_FKKINVDOC_REV_FREE_SEL INDEX 1 INTO DATA(WA_FKKINVDOC_REV_FREE_SEL2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<FKKINVDOC_REV_FREE_SEL>-MANDT = 1.
<FKKINVDOC_REV_FREE_SEL>-INVDOCNO = 1.
<FKKINVDOC_REV_FREE_SEL>-REVTASK = 1.
<FKKINVDOC_REV_FREE_SEL>-STATUS = 1.
<FKKINVDOC_REV_FREE_SEL>-REVREASON = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_FKKINVDOC_REV_FREE_SEL-STODT, sy-vline,
  WA_FKKINVDOC_REV_FREE_SEL-INV_TYPE, sy-vline,
  WA_FKKINVDOC_REV_FREE_SEL-INV_PROCESS, sy-vline,
  WA_FKKINVDOC_REV_FREE_SEL-INV_CATEGORY, sy-vline,
  WA_FKKINVDOC_REV_FREE_SEL-GPART, sy-vline,
  WA_FKKINVDOC_REV_FREE_SEL-GPART_SEL, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_FKKINVDOC_REV_FREE_SEL 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_FKKINVDOC_REV_FREE_SEL 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_FKKINVDOC_REV_FREE_SEL INTO WA_FKKINVDOC_REV_FREE_SEL.


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

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

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

*Conversion exit ALPHA, internal->external for field VKONT_SEL
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_FKKINVDOC_REV_FREE_SEL-VKONT_SEL
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_FKKINVDOC_REV_FREE_SEL-VKONT_SEL.
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_FKKINVDOC_REV_FREE_SEL_STR, 
MANDT TYPE STRING,
INVDOCNO TYPE STRING,
REVTASK TYPE STRING,
STATUS TYPE STRING,
REVREASON TYPE STRING,
STODT TYPE STRING,
INV_TYPE TYPE STRING,
INV_PROCESS TYPE STRING,
INV_CATEGORY TYPE STRING,
GPART TYPE STRING,
GPART_SEL TYPE STRING,
VKONT TYPE STRING,
VKONT_SEL TYPE STRING,
MDCAT TYPE STRING,
INVDOC_CRDATE TYPE STRING,
INVDOC_CRTIME TYPE STRING,
INVPERCAT TYPE STRING,
INVPERIOD TYPE STRING,
FAEDN TYPE STRING,
TOTAL_CURR TYPE STRING,
TOTAL_AMT TYPE STRING,
ARCHIVED TYPE STRING,
CRNAME TYPE STRING,
CRDATE TYPE STRING,
CRTIME TYPE STRING,
LOEDT TYPE STRING,END OF T_EKKO_STR.
DATA: WA_FKKINVDOC_REV_FREE_SEL_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_FKKINVDOC_REV_FREE_SEL_STR-MANDT sy-vline 
WA_FKKINVDOC_REV_FREE_SEL_STR-INVDOCNO sy-vline 
WA_FKKINVDOC_REV_FREE_SEL_STR-REVTASK sy-vline 
WA_FKKINVDOC_REV_FREE_SEL_STR-STATUS sy-vline 
WA_FKKINVDOC_REV_FREE_SEL_STR-REVREASON sy-vline 
WA_FKKINVDOC_REV_FREE_SEL_STR-STODT sy-vline 
WA_FKKINVDOC_REV_FREE_SEL_STR-INV_TYPE sy-vline 
WA_FKKINVDOC_REV_FREE_SEL_STR-INV_PROCESS sy-vline 
WA_FKKINVDOC_REV_FREE_SEL_STR-INV_CATEGORY sy-vline 
WA_FKKINVDOC_REV_FREE_SEL_STR-GPART sy-vline 
WA_FKKINVDOC_REV_FREE_SEL_STR-GPART_SEL sy-vline 
WA_FKKINVDOC_REV_FREE_SEL_STR-VKONT sy-vline 
WA_FKKINVDOC_REV_FREE_SEL_STR-VKONT_SEL sy-vline 
WA_FKKINVDOC_REV_FREE_SEL_STR-MDCAT sy-vline 
WA_FKKINVDOC_REV_FREE_SEL_STR-INVDOC_CRDATE sy-vline 
WA_FKKINVDOC_REV_FREE_SEL_STR-INVDOC_CRTIME sy-vline 
WA_FKKINVDOC_REV_FREE_SEL_STR-INVPERCAT sy-vline 
WA_FKKINVDOC_REV_FREE_SEL_STR-INVPERIOD sy-vline 
WA_FKKINVDOC_REV_FREE_SEL_STR-FAEDN sy-vline 
WA_FKKINVDOC_REV_FREE_SEL_STR-TOTAL_CURR sy-vline 
WA_FKKINVDOC_REV_FREE_SEL_STR-TOTAL_AMT sy-vline 
WA_FKKINVDOC_REV_FREE_SEL_STR-ARCHIVED sy-vline 
WA_FKKINVDOC_REV_FREE_SEL_STR-CRNAME sy-vline 
WA_FKKINVDOC_REV_FREE_SEL_STR-CRDATE sy-vline 
WA_FKKINVDOC_REV_FREE_SEL_STR-CRTIME sy-vline 
WA_FKKINVDOC_REV_FREE_SEL_STR-LOEDT sy-vline      INTO ld_text SEPARATED BY SPACE.

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