ABAP Select data from SAP table DFKKCVS into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM DFKKCVS
*  INTO TABLE @DATA(IT_DFKKCVS2).
*--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_DFKKCVS INDEX 1 INTO DATA(WA_DFKKCVS2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<DFKKCVS>-MANDT = 1.
<DFKKCVS>-NRZAS = 1.
<DFKKCVS>-PAYNR = 1.
<DFKKCVS>-EXTPY = 1.
<DFKKCVS>-CCODE = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_DFKKCVS-PAYST, sy-vline,
  WA_DFKKCVS-TRMTP, sy-vline,
  WA_DFKKCVS-LOTNM, sy-vline,
  WA_DFKKCVS-LOTPS, sy-vline,
  WA_DFKKCVS-OPBEL, sy-vline,
  WA_DFKKCVS-BUDAT, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_DFKKCVS 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_DFKKCVS 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_DFKKCVS INTO WA_DFKKCVS.


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

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

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

*Conversion exit ALPHA, internal->external for field RTREV
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_DFKKCVS-RTREV
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_DFKKCVS-RTREV.
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_DFKKCVS_STR, 
MANDT TYPE STRING,
NRZAS TYPE STRING,
PAYNR TYPE STRING,
EXTPY TYPE STRING,
CCODE TYPE STRING,
PAYST TYPE STRING,
TRMTP TYPE STRING,
LOTNM TYPE STRING,
LOTPS TYPE STRING,
OPBEL TYPE STRING,
BUDAT TYPE STRING,
PFDAT TYPE STRING,
CVSTP TYPE STRING,
BETRZ TYPE STRING,
SPTAX TYPE STRING,
WAERS TYPE STRING,
XSTAX TYPE STRING,
RECAL TYPE STRING,
RECLD TYPE STRING,
RTREV TYPE STRING,
ERNAM TYPE STRING,
ERDAT TYPE STRING,
ERTIM TYPE STRING,
AENAM TYPE STRING,
AEDAT TYPE STRING,
AETIM TYPE STRING,END OF T_EKKO_STR.
DATA: WA_DFKKCVS_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_DFKKCVS_STR-MANDT sy-vline 
WA_DFKKCVS_STR-NRZAS sy-vline 
WA_DFKKCVS_STR-PAYNR sy-vline 
WA_DFKKCVS_STR-EXTPY sy-vline 
WA_DFKKCVS_STR-CCODE sy-vline 
WA_DFKKCVS_STR-PAYST sy-vline 
WA_DFKKCVS_STR-TRMTP sy-vline 
WA_DFKKCVS_STR-LOTNM sy-vline 
WA_DFKKCVS_STR-LOTPS sy-vline 
WA_DFKKCVS_STR-OPBEL sy-vline 
WA_DFKKCVS_STR-BUDAT sy-vline 
WA_DFKKCVS_STR-PFDAT sy-vline 
WA_DFKKCVS_STR-CVSTP sy-vline 
WA_DFKKCVS_STR-BETRZ sy-vline 
WA_DFKKCVS_STR-SPTAX sy-vline 
WA_DFKKCVS_STR-WAERS sy-vline 
WA_DFKKCVS_STR-XSTAX sy-vline 
WA_DFKKCVS_STR-RECAL sy-vline 
WA_DFKKCVS_STR-RECLD sy-vline 
WA_DFKKCVS_STR-RTREV sy-vline 
WA_DFKKCVS_STR-ERNAM sy-vline 
WA_DFKKCVS_STR-ERDAT sy-vline 
WA_DFKKCVS_STR-ERTIM sy-vline 
WA_DFKKCVS_STR-AENAM sy-vline 
WA_DFKKCVS_STR-AEDAT sy-vline 
WA_DFKKCVS_STR-AETIM sy-vline      INTO ld_text SEPARATED BY SPACE.

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