ABAP Select data from SAP table VCNUM into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM VCNUM
*  INTO TABLE @DATA(IT_VCNUM2).
*--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_VCNUM INDEX 1 INTO DATA(WA_VCNUM2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<VCNUM>-MANDT = 1.
<VCNUM>-CCINS = 1.
<VCNUM>-CCNUM = 1.
<VCNUM>-CCNAME = 1.
<VCNUM>-DATAB = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_VCNUM-DATBI, sy-vline,
  WA_VCNUM-CCTYP, sy-vline,
  WA_VCNUM-CCLOCK, sy-vline,
  WA_VCNUM-ISSBANK, sy-vline,
  WA_VCNUM-AUSGDAT, sy-vline,
  WA_VCNUM-CCNUM_MASK, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_VCNUM 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_VCNUM 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_VCNUM INTO WA_VCNUM.


*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.
ENDFORM. 

*&---------------------------------------------------------------------*
*& Form process_as_string_field_values
*&---------------------------------------------------------------------*
FORM process_as_string_field_values CHANGING p_EKKO LIKE wa_EKKO.

TYPES: BEGIN OF T_VCNUM_STR, 
MANDT TYPE STRING,
CCINS TYPE STRING,
CCNUM TYPE STRING,
CCNAME TYPE STRING,
DATAB TYPE STRING,
DATBI TYPE STRING,
CCTYP TYPE STRING,
CCLOCK TYPE STRING,
ISSBANK TYPE STRING,
AUSGDAT TYPE STRING,
CCNUM_MASK TYPE STRING,
CCARD_GUID TYPE STRING,
CCARD_ID TYPE STRING,
CCACCNAME TYPE STRING,END OF T_EKKO_STR.
DATA: WA_VCNUM_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_VCNUM_STR-MANDT sy-vline 
WA_VCNUM_STR-CCINS sy-vline 
WA_VCNUM_STR-CCNUM sy-vline 
WA_VCNUM_STR-CCNAME sy-vline 
WA_VCNUM_STR-DATAB sy-vline 
WA_VCNUM_STR-DATBI sy-vline 
WA_VCNUM_STR-CCTYP sy-vline 
WA_VCNUM_STR-CCLOCK sy-vline 
WA_VCNUM_STR-ISSBANK sy-vline 
WA_VCNUM_STR-AUSGDAT sy-vline 
WA_VCNUM_STR-CCNUM_MASK sy-vline 
WA_VCNUM_STR-CCARD_GUID sy-vline 
WA_VCNUM_STR-CCARD_ID sy-vline 
WA_VCNUM_STR-CCACCNAME sy-vline      INTO ld_text SEPARATED BY SPACE.

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