ABAP Select data from SAP table KLFOFDUE into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM KLFOFDUE
*  INTO TABLE @DATA(IT_KLFOFDUE2).
*--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_KLFOFDUE INDEX 1 INTO DATA(WA_KLFOFDUE2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<KLFOFDUE>-RDEALER = 1.
<KLFOFDUE>-CONTROL01 = 1.
<KLFOFDUE>-SLPG = 1.
<KLFOFDUE>-ARR = 1.
<KLFOFDUE>-RATING = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_KLFOFDUE-RRFIND, sy-vline,
  WA_KLFOFDUE-NID, sy-vline,
  WA_KLFOFDUE-CAID, sy-vline,
  WA_KLFOFDUE-FAZNR_OBJ, sy-vline,
  WA_KLFOFDUE-FAZID_OBJ, sy-vline,
  WA_KLFOFDUE-PARTNR, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_KLFOFDUE 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_KLFOFDUE 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_KLFOFDUE INTO WA_KLFOFDUE.


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

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

*Conversion exit ALPHA, internal->external for field PARTNER_DERI
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_KLFOFDUE-PARTNER_DERI
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_KLFOFDUE-PARTNER_DERI.
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_KLFOFDUE_STR, 
RDEALER TYPE STRING,
CONTROL01 TYPE STRING,
SLPG TYPE STRING,
ARR TYPE STRING,
RATING TYPE STRING,
RRFIND TYPE STRING,
NID TYPE STRING,
CAID TYPE STRING,
FAZNR_OBJ TYPE STRING,
FAZID_OBJ TYPE STRING,
PARTNR TYPE STRING,
RISK_EFFECT TYPE STRING,
SARAKT TYPE STRING,
DARBEG TYPE STRING,
DAREND TYPE STRING,
GRUPP TYPE STRING,
EBENE TYPE STRING,
DISPW TYPE STRING,
PARTNER_DERI TYPE STRING,
LRB TYPE STRING,
LRL TYPE STRING,
LRL_POL TYPE STRING,
INTORG TYPE STRING,
LEQ TYPE STRING,
CEQ TYPE STRING,
DLRBEG TYPE STRING,
DLREND TYPE STRING,
SLRAKT TYPE STRING,
UPUSERLR TYPE STRING,
DUPDATLR TYPE STRING,
TUPTIMLR TYPE STRING,
CRUSERLR TYPE STRING,
DCRDATLR TYPE STRING,
TCRTIMLR TYPE STRING,
WGWAERK TYPE STRING,END OF T_EKKO_STR.
DATA: WA_KLFOFDUE_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_KLFOFDUE_STR-RDEALER sy-vline 
WA_KLFOFDUE_STR-CONTROL01 sy-vline 
WA_KLFOFDUE_STR-SLPG sy-vline 
WA_KLFOFDUE_STR-ARR sy-vline 
WA_KLFOFDUE_STR-RATING sy-vline 
WA_KLFOFDUE_STR-RRFIND sy-vline 
WA_KLFOFDUE_STR-NID sy-vline 
WA_KLFOFDUE_STR-CAID sy-vline 
WA_KLFOFDUE_STR-FAZNR_OBJ sy-vline 
WA_KLFOFDUE_STR-FAZID_OBJ sy-vline 
WA_KLFOFDUE_STR-PARTNR sy-vline 
WA_KLFOFDUE_STR-RISK_EFFECT sy-vline 
WA_KLFOFDUE_STR-SARAKT sy-vline 
WA_KLFOFDUE_STR-DARBEG sy-vline 
WA_KLFOFDUE_STR-DAREND sy-vline 
WA_KLFOFDUE_STR-GRUPP sy-vline 
WA_KLFOFDUE_STR-EBENE sy-vline 
WA_KLFOFDUE_STR-DISPW sy-vline 
WA_KLFOFDUE_STR-PARTNER_DERI sy-vline 
WA_KLFOFDUE_STR-LRB sy-vline 
WA_KLFOFDUE_STR-LRL sy-vline 
WA_KLFOFDUE_STR-LRL_POL sy-vline 
WA_KLFOFDUE_STR-INTORG sy-vline 
WA_KLFOFDUE_STR-LEQ sy-vline 
WA_KLFOFDUE_STR-CEQ sy-vline 
WA_KLFOFDUE_STR-DLRBEG sy-vline 
WA_KLFOFDUE_STR-DLREND sy-vline 
WA_KLFOFDUE_STR-SLRAKT sy-vline 
WA_KLFOFDUE_STR-UPUSERLR sy-vline 
WA_KLFOFDUE_STR-DUPDATLR sy-vline 
WA_KLFOFDUE_STR-TUPTIMLR sy-vline 
WA_KLFOFDUE_STR-CRUSERLR sy-vline 
WA_KLFOFDUE_STR-DCRDATLR sy-vline 
WA_KLFOFDUE_STR-TCRTIMLR sy-vline 
WA_KLFOFDUE_STR-WGWAERK sy-vline      INTO ld_text SEPARATED BY SPACE.

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