ABAP Select data from SAP table CWCGRPSUBTREE into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM CWCGRPSUBTREE
*  INTO TABLE @DATA(IT_CWCGRPSUBTREE2).
*--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_CWCGRPSUBTREE INDEX 1 INTO DATA(WA_CWCGRPSUBTREE2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<CWCGRPSUBTREE>-MANDT = 1.
<CWCGRPSUBTREE>-HIERARCHYNODE = 1.
<CWCGRPSUBTREE>-HIERARCHYPARENTNODE = 1.
<CWCGRPSUBTREE>-HIERARCHYNODETYPE = 1.
<CWCGRPSUBTREE>-OBJECTNAME = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_CWCGRPSUBTREE-HIERARCHYLEVEL, sy-vline,
  WA_CWCGRPSUBTREE-WORKCENTERGROUP, sy-vline,
  WA_CWCGRPSUBTREE-WRKCTRGRPNODEID, sy-vline,
  WA_CWCGRPSUBTREE-WRKCTRGRPPARENTNODEID, sy-vline,
  WA_CWCGRPSUBTREE-PLANT, sy-vline,
  WA_CWCGRPSUBTREE-WORKCENTERTEXT, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_CWCGRPSUBTREE 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_CWCGRPSUBTREE 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_CWCGRPSUBTREE INTO WA_CWCGRPSUBTREE.


*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_CWCGRPSUBTREE_STR, 
MANDT TYPE STRING,
HIERARCHYNODE TYPE STRING,
HIERARCHYPARENTNODE TYPE STRING,
HIERARCHYNODETYPE TYPE STRING,
OBJECTNAME TYPE STRING,
HIERARCHYLEVEL TYPE STRING,
WORKCENTERGROUP TYPE STRING,
WRKCTRGRPNODEID TYPE STRING,
WRKCTRGRPPARENTNODEID TYPE STRING,
PLANT TYPE STRING,
WORKCENTERTEXT TYPE STRING,
WORKCENTERCATEGORYCODE TYPE STRING,
WORKCENTERCATEGORYNAME TYPE STRING,
WORKCENTERASSGMTISDIRECT TYPE STRING,
WORKCENTERGROUPOBJECTCOUNT TYPE STRING,END OF T_EKKO_STR.
DATA: WA_CWCGRPSUBTREE_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_CWCGRPSUBTREE_STR-MANDT sy-vline 
WA_CWCGRPSUBTREE_STR-HIERARCHYNODE sy-vline 
WA_CWCGRPSUBTREE_STR-HIERARCHYPARENTNODE sy-vline 
WA_CWCGRPSUBTREE_STR-HIERARCHYNODETYPE sy-vline 
WA_CWCGRPSUBTREE_STR-OBJECTNAME sy-vline 
WA_CWCGRPSUBTREE_STR-HIERARCHYLEVEL sy-vline 
WA_CWCGRPSUBTREE_STR-WORKCENTERGROUP sy-vline 
WA_CWCGRPSUBTREE_STR-WRKCTRGRPNODEID sy-vline 
WA_CWCGRPSUBTREE_STR-WRKCTRGRPPARENTNODEID sy-vline 
WA_CWCGRPSUBTREE_STR-PLANT sy-vline 
WA_CWCGRPSUBTREE_STR-WORKCENTERTEXT sy-vline 
WA_CWCGRPSUBTREE_STR-WORKCENTERCATEGORYCODE sy-vline 
WA_CWCGRPSUBTREE_STR-WORKCENTERCATEGORYNAME sy-vline 
WA_CWCGRPSUBTREE_STR-WORKCENTERASSGMTISDIRECT sy-vline 
WA_CWCGRPSUBTREE_STR-WORKCENTERGROUPOBJECTCOUNT sy-vline      INTO ld_text SEPARATED BY SPACE.

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