ABAP Select data from SAP table IWUSKFCAC into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM IWUSKFCAC
*  INTO TABLE @DATA(IT_IWUSKFCAC2).
*--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_IWUSKFCAC INDEX 1 INTO DATA(WA_IWUSKFCAC2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<IWUSKFCAC>-MANDT = 1.
<IWUSKFCAC>-STATISTICALKEYFIGURE = 1.
<IWUSKFCAC>-ALLOCATIONCYCLE = 1.
<IWUSKFCAC>-CONTROLLINGAREA = 1.
<IWUSKFCAC>-ALLOCATIONCYCLENAMETEXT = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_IWUSKFCAC-ALLOCATIONCYCLESTARTDATE, sy-vline,
  WA_IWUSKFCAC-ALLOCATIONCYCLEENDDATE, sy-vline,
  WA_IWUSKFCAC-LASTCHANGEDATE, sy-vline,
  WA_IWUSKFCAC-LASTCHANGEDBYUSER, sy-vline,
  WA_IWUSKFCAC-ALLOCATIONLASTEXECUTEDDATE, sy-vline,
  WA_IWUSKFCAC-ALLOCATIONLASTEXECUTEDBYUSER, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_IWUSKFCAC 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_IWUSKFCAC 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_IWUSKFCAC INTO WA_IWUSKFCAC.


*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 LEDGER
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_IWUSKFCAC-LEDGER
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_IWUSKFCAC-LEDGER.
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_IWUSKFCAC_STR, 
MANDT TYPE STRING,
STATISTICALKEYFIGURE TYPE STRING,
ALLOCATIONCYCLE TYPE STRING,
CONTROLLINGAREA TYPE STRING,
ALLOCATIONCYCLENAMETEXT TYPE STRING,
ALLOCATIONCYCLESTARTDATE TYPE STRING,
ALLOCATIONCYCLEENDDATE TYPE STRING,
LASTCHANGEDATE TYPE STRING,
LASTCHANGEDBYUSER TYPE STRING,
ALLOCATIONLASTEXECUTEDDATE TYPE STRING,
ALLOCATIONLASTEXECUTEDBYUSER TYPE STRING,
ALLOCATIONTYPE TYPE STRING,
ALLOCATIONSTATUS TYPE STRING,
ALLOCATIONACTUALPLANVARIANT TYPE STRING,
ALLOCACTUALPLANVARIANTTEXT TYPE STRING,
ALLOCATIONPOSTINGTYPE TYPE STRING,
ALLOCATIONPOSTINGTYPECONTEXT TYPE STRING,
ALLOCATIONCYCLENAME TYPE STRING,
LEDGER TYPE STRING,END OF T_EKKO_STR.
DATA: WA_IWUSKFCAC_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_IWUSKFCAC_STR-MANDT sy-vline 
WA_IWUSKFCAC_STR-STATISTICALKEYFIGURE sy-vline 
WA_IWUSKFCAC_STR-ALLOCATIONCYCLE sy-vline 
WA_IWUSKFCAC_STR-CONTROLLINGAREA sy-vline 
WA_IWUSKFCAC_STR-ALLOCATIONCYCLENAMETEXT sy-vline 
WA_IWUSKFCAC_STR-ALLOCATIONCYCLESTARTDATE sy-vline 
WA_IWUSKFCAC_STR-ALLOCATIONCYCLEENDDATE sy-vline 
WA_IWUSKFCAC_STR-LASTCHANGEDATE sy-vline 
WA_IWUSKFCAC_STR-LASTCHANGEDBYUSER sy-vline 
WA_IWUSKFCAC_STR-ALLOCATIONLASTEXECUTEDDATE sy-vline 
WA_IWUSKFCAC_STR-ALLOCATIONLASTEXECUTEDBYUSER sy-vline 
WA_IWUSKFCAC_STR-ALLOCATIONTYPE sy-vline 
WA_IWUSKFCAC_STR-ALLOCATIONSTATUS sy-vline 
WA_IWUSKFCAC_STR-ALLOCATIONACTUALPLANVARIANT sy-vline 
WA_IWUSKFCAC_STR-ALLOCACTUALPLANVARIANTTEXT sy-vline 
WA_IWUSKFCAC_STR-ALLOCATIONPOSTINGTYPE sy-vline 
WA_IWUSKFCAC_STR-ALLOCATIONPOSTINGTYPECONTEXT sy-vline 
WA_IWUSKFCAC_STR-ALLOCATIONCYCLENAME sy-vline 
WA_IWUSKFCAC_STR-LEDGER sy-vline      INTO ld_text SEPARATED BY SPACE.

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