ABAP Select data from SAP table /DSD/VC_CUST_TREE into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP /DSD/VC_CUST_TREE 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 /DSD/VC_CUST_TREE. 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 /DSD/VC_CUST_TREE 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_/DSD/VC_CUST_TREE TYPE STANDARD TABLE OF /DSD/VC_CUST_TREE,
      WA_/DSD/VC_CUST_TREE TYPE /DSD/VC_CUST_TREE,
      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: </DSD/VC_CUST_TREE> TYPE /DSD/VC_CUST_TREE.

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

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM /DSD/VC_CUST_TREE
  INTO TABLE IT_/DSD/VC_CUST_TREE.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM /DSD/VC_CUST_TREE
*  INTO TABLE @DATA(IT_/DSD/VC_CUST_TREE2).
*--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_/DSD/VC_CUST_TREE INDEX 1 INTO DATA(WA_/DSD/VC_CUST_TREE2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_/DSD/VC_CUST_TREE ASSIGNING </DSD/VC_CUST_TREE>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
</DSD/VC_CUST_TREE>-KUNNR = 1.
</DSD/VC_CUST_TREE>-CUST_CHECK = 1.
</DSD/VC_CUST_TREE>-ANRED = 1.
</DSD/VC_CUST_TREE>-NAME1 = 1.
</DSD/VC_CUST_TREE>-NAME2 = 1.

ENDLOOP.

LOOP AT IT_/DSD/VC_CUST_TREE INTO WA_/DSD/VC_CUST_TREE.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_/DSD/VC_CUST_TREE-STRAS, sy-vline,
  WA_/DSD/VC_CUST_TREE-PSTLZ, sy-vline,
  WA_/DSD/VC_CUST_TREE-ORT01, sy-vline,
  WA_/DSD/VC_CUST_TREE-TELF1, sy-vline,
  WA_/DSD/VC_CUST_TREE-TELFX, sy-vline,
  WA_/DSD/VC_CUST_TREE-REGIO, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_/DSD/VC_CUST_TREE 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_/DSD/VC_CUST_TREE 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_/DSD/VC_CUST_TREE INTO WA_/DSD/VC_CUST_TREE.


*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 KUNNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_/DSD/VC_CUST_TREE-KUNNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_/DSD/VC_CUST_TREE-KUNNR.
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_/DSD/VC_CUST_TREE_STR, 
KUNNR TYPE STRING,
CUST_CHECK TYPE STRING,
ANRED TYPE STRING,
NAME1 TYPE STRING,
NAME2 TYPE STRING,
STRAS TYPE STRING,
PSTLZ TYPE STRING,
ORT01 TYPE STRING,
TELF1 TYPE STRING,
TELFX TYPE STRING,
REGIO TYPE STRING,
LAND1 TYPE STRING,
SORTL TYPE STRING,
NODEKEY TYPE STRING,
NODEKEY_PARENT TYPE STRING,
ROOT_NODE_FLAG TYPE STRING,
SALES_ORG TYPE STRING,
DIST_CHANNEL TYPE STRING,
DIVISION TYPE STRING,END OF T_EKKO_STR.
DATA: WA_/DSD/VC_CUST_TREE_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_/DSD/VC_CUST_TREE_STR-KUNNR sy-vline 
WA_/DSD/VC_CUST_TREE_STR-CUST_CHECK sy-vline 
WA_/DSD/VC_CUST_TREE_STR-ANRED sy-vline 
WA_/DSD/VC_CUST_TREE_STR-NAME1 sy-vline 
WA_/DSD/VC_CUST_TREE_STR-NAME2 sy-vline 
WA_/DSD/VC_CUST_TREE_STR-STRAS sy-vline 
WA_/DSD/VC_CUST_TREE_STR-PSTLZ sy-vline 
WA_/DSD/VC_CUST_TREE_STR-ORT01 sy-vline 
WA_/DSD/VC_CUST_TREE_STR-TELF1 sy-vline 
WA_/DSD/VC_CUST_TREE_STR-TELFX sy-vline 
WA_/DSD/VC_CUST_TREE_STR-REGIO sy-vline 
WA_/DSD/VC_CUST_TREE_STR-LAND1 sy-vline 
WA_/DSD/VC_CUST_TREE_STR-SORTL sy-vline 
WA_/DSD/VC_CUST_TREE_STR-NODEKEY sy-vline 
WA_/DSD/VC_CUST_TREE_STR-NODEKEY_PARENT sy-vline 
WA_/DSD/VC_CUST_TREE_STR-ROOT_NODE_FLAG sy-vline 
WA_/DSD/VC_CUST_TREE_STR-SALES_ORG sy-vline 
WA_/DSD/VC_CUST_TREE_STR-DIST_CHANNEL sy-vline 
WA_/DSD/VC_CUST_TREE_STR-DIVISION sy-vline      INTO ld_text SEPARATED BY SPACE.

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