ABAP Select data from SAP table CLVKSSK into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM CLVKSSK
*  INTO TABLE @DATA(IT_CLVKSSK2).
*--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_CLVKSSK INDEX 1 INTO DATA(WA_CLVKSSK2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<CLVKSSK>-MANDT = 1.
<CLVKSSK>-OBJEK = 1.
<CLVKSSK>-MAFID = 1.
<CLVKSSK>-KLART = 1.
<CLVKSSK>-CLINT = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_CLVKSSK-ADZHL, sy-vline,
  WA_CLVKSSK-ZAEHL, sy-vline,
  WA_CLVKSSK-STATU, sy-vline,
  WA_CLVKSSK-STDCL, sy-vline,
  WA_CLVKSSK-REKRI, sy-vline,
  WA_CLVKSSK-AENNR, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_CLVKSSK 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_CLVKSSK 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_CLVKSSK INTO WA_CLVKSSK.


*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 AENNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_CLVKSSK-AENNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_CLVKSSK-AENNR.
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_CLVKSSK_STR, 
MANDT TYPE STRING,
OBJEK TYPE STRING,
MAFID TYPE STRING,
KLART TYPE STRING,
CLINT TYPE STRING,
ADZHL TYPE STRING,
ZAEHL TYPE STRING,
STATU TYPE STRING,
STDCL TYPE STRING,
REKRI TYPE STRING,
AENNR TYPE STRING,
DATUV TYPE STRING,
LKENZ TYPE STRING,
DATUB TYPE STRING,
VBKZ TYPE STRING,END OF T_EKKO_STR.
DATA: WA_CLVKSSK_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_CLVKSSK_STR-MANDT sy-vline 
WA_CLVKSSK_STR-OBJEK sy-vline 
WA_CLVKSSK_STR-MAFID sy-vline 
WA_CLVKSSK_STR-KLART sy-vline 
WA_CLVKSSK_STR-CLINT sy-vline 
WA_CLVKSSK_STR-ADZHL sy-vline 
WA_CLVKSSK_STR-ZAEHL sy-vline 
WA_CLVKSSK_STR-STATU sy-vline 
WA_CLVKSSK_STR-STDCL sy-vline 
WA_CLVKSSK_STR-REKRI sy-vline 
WA_CLVKSSK_STR-AENNR sy-vline 
WA_CLVKSSK_STR-DATUV sy-vline 
WA_CLVKSSK_STR-LKENZ sy-vline 
WA_CLVKSSK_STR-DATUB sy-vline 
WA_CLVKSSK_STR-VBKZ sy-vline      INTO ld_text SEPARATED BY SPACE.

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