ABAP Select data from SAP table FKK_RECLASS into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM FKK_RECLASS
*  INTO TABLE @DATA(IT_FKK_RECLASS2).
*--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_FKK_RECLASS INDEX 1 INTO DATA(WA_FKK_RECLASS2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<FKK_RECLASS>-KEY_DATE = 1.
<FKK_RECLASS>-NAME = 1.
<FKK_RECLASS>-LAUFNR = 1.
<FKK_RECLASS>-HKONT = 1.
<FKK_RECLASS>-BUKRS = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_FKK_RECLASS-GSBER, sy-vline,
  WA_FKK_RECLASS-SEGMENT, sy-vline,
  WA_FKK_RECLASS-VBUND, sy-vline,
  WA_FKK_RECLASS-WAERW, sy-vline,
  WA_FKK_RECLASS-PRCTR, sy-vline,
  WA_FKK_RECLASS-BETRH, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_FKK_RECLASS 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_FKK_RECLASS 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_FKK_RECLASS INTO WA_FKK_RECLASS.


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

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

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

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

*Conversion exit ALPHA, internal->external for field OPBEL1
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_FKK_RECLASS-OPBEL1
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_FKK_RECLASS-OPBEL1.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field OPBEL2
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_FKK_RECLASS-OPBEL2
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_FKK_RECLASS-OPBEL2.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field RLDNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_FKK_RECLASS-RLDNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_FKK_RECLASS-RLDNR.
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_FKK_RECLASS_STR, 
KEY_DATE TYPE STRING,
NAME TYPE STRING,
LAUFNR TYPE STRING,
HKONT TYPE STRING,
BUKRS TYPE STRING,
GSBER TYPE STRING,
SEGMENT TYPE STRING,
VBUND TYPE STRING,
WAERW TYPE STRING,
PRCTR TYPE STRING,
BETRH TYPE STRING,
WAERS TYPE STRING,
DATUM TYPE STRING,
ZEIT TYPE STRING,
OPBEL1 TYPE STRING,
OPBEL2 TYPE STRING,
OPUPK_KORR TYPE STRING,
OPUPK_ZIEL TYPE STRING,
WAER_NUM TYPE STRING,
BETRW TYPE STRING,
CURTP TYPE STRING,
BWBER TYPE STRING,
RLDNR TYPE STRING,END OF T_EKKO_STR.
DATA: WA_FKK_RECLASS_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_FKK_RECLASS_STR-KEY_DATE sy-vline 
WA_FKK_RECLASS_STR-NAME sy-vline 
WA_FKK_RECLASS_STR-LAUFNR sy-vline 
WA_FKK_RECLASS_STR-HKONT sy-vline 
WA_FKK_RECLASS_STR-BUKRS sy-vline 
WA_FKK_RECLASS_STR-GSBER sy-vline 
WA_FKK_RECLASS_STR-SEGMENT sy-vline 
WA_FKK_RECLASS_STR-VBUND sy-vline 
WA_FKK_RECLASS_STR-WAERW sy-vline 
WA_FKK_RECLASS_STR-PRCTR sy-vline 
WA_FKK_RECLASS_STR-BETRH sy-vline 
WA_FKK_RECLASS_STR-WAERS sy-vline 
WA_FKK_RECLASS_STR-DATUM sy-vline 
WA_FKK_RECLASS_STR-ZEIT sy-vline 
WA_FKK_RECLASS_STR-OPBEL1 sy-vline 
WA_FKK_RECLASS_STR-OPBEL2 sy-vline 
WA_FKK_RECLASS_STR-OPUPK_KORR sy-vline 
WA_FKK_RECLASS_STR-OPUPK_ZIEL sy-vline 
WA_FKK_RECLASS_STR-WAER_NUM sy-vline 
WA_FKK_RECLASS_STR-BETRW sy-vline 
WA_FKK_RECLASS_STR-CURTP sy-vline 
WA_FKK_RECLASS_STR-BWBER sy-vline 
WA_FKK_RECLASS_STR-RLDNR sy-vline      INTO ld_text SEPARATED BY SPACE.

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