ABAP Select data from SAP table IWCGRPTREEAGR into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM IWCGRPTREEAGR
*  INTO TABLE @DATA(IT_IWCGRPTREEAGR2).
*--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_IWCGRPTREEAGR INDEX 1 INTO DATA(WA_IWCGRPTREEAGR2).


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

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

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_IWCGRPTREEAGR-PARENTNODE, sy-vline,
  WA_IWCGRPTREEAGR-HIERARCHYNODEUNIQUEID, sy-vline,
  WA_IWCGRPTREEAGR-WORKCENTERGROUPROOT, sy-vline,
  WA_IWCGRPTREEAGR-WORKCENTERGROUP, sy-vline,
  WA_IWCGRPTREEAGR-OBJECTNAME, sy-vline,
  WA_IWCGRPTREEAGR-OBJECTTYPETEXT, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_IWCGRPTREEAGR 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_IWCGRPTREEAGR 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_IWCGRPTREEAGR INTO WA_IWCGRPTREEAGR.


*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_IWCGRPTREEAGR_STR, 
MANDT TYPE STRING,
HIERARCHYROOTNODE TYPE STRING,
HIERARCHYPARENTNODE TYPE STRING,
HIERARCHYNODE TYPE STRING,
HIERARCHYNODETYPE TYPE STRING,
PARENTNODE TYPE STRING,
HIERARCHYNODEUNIQUEID TYPE STRING,
WORKCENTERGROUPROOT TYPE STRING,
WORKCENTERGROUP TYPE STRING,
OBJECTNAME TYPE STRING,
OBJECTTYPETEXT TYPE STRING,
HIERARCHYNODEORDINALNUMBER TYPE STRING,
HIERARCHYPARENTNODEORDINALNMBR TYPE STRING,
HIERARCHYNODESUBTREESIZE TYPE STRING,
HIERARCHYLEVEL TYPE STRING,
WRKCTRGRPHIERARCHYLEVEL TYPE STRING,
HIERARCHYNODEISORPHAN TYPE STRING,
HIERARCHYNODEISCYCLEENDPOINT TYPE STRING,
NUMBEROFWORKCENTERS TYPE STRING,
PLANT TYPE STRING,
SHIFTNOTETYPE TYPE STRING,
SHIFTREPORTTYPE TYPE STRING,
OBJECTDESCRIPTION TYPE STRING,
WRKCTRGRPDRILLSTATE TYPE STRING,
WORKCENTERASSGMTISDIRECT TYPE STRING,
WORKCENTERGROUPTYPE TYPE STRING,
WORKCENTERGROUPTYPEDESCRIPTION TYPE STRING,
WORKCENTERGROUPROOTTYPE TYPE STRING,
WORKCENTERGROUPROOTTYPEDESC TYPE STRING,END OF T_EKKO_STR.
DATA: WA_IWCGRPTREEAGR_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_IWCGRPTREEAGR_STR-MANDT sy-vline 
WA_IWCGRPTREEAGR_STR-HIERARCHYROOTNODE sy-vline 
WA_IWCGRPTREEAGR_STR-HIERARCHYPARENTNODE sy-vline 
WA_IWCGRPTREEAGR_STR-HIERARCHYNODE sy-vline 
WA_IWCGRPTREEAGR_STR-HIERARCHYNODETYPE sy-vline 
WA_IWCGRPTREEAGR_STR-PARENTNODE sy-vline 
WA_IWCGRPTREEAGR_STR-HIERARCHYNODEUNIQUEID sy-vline 
WA_IWCGRPTREEAGR_STR-WORKCENTERGROUPROOT sy-vline 
WA_IWCGRPTREEAGR_STR-WORKCENTERGROUP sy-vline 
WA_IWCGRPTREEAGR_STR-OBJECTNAME sy-vline 
WA_IWCGRPTREEAGR_STR-OBJECTTYPETEXT sy-vline 
WA_IWCGRPTREEAGR_STR-HIERARCHYNODEORDINALNUMBER sy-vline 
WA_IWCGRPTREEAGR_STR-HIERARCHYPARENTNODEORDINALNMBR sy-vline 
WA_IWCGRPTREEAGR_STR-HIERARCHYNODESUBTREESIZE sy-vline 
WA_IWCGRPTREEAGR_STR-HIERARCHYLEVEL sy-vline 
WA_IWCGRPTREEAGR_STR-WRKCTRGRPHIERARCHYLEVEL sy-vline 
WA_IWCGRPTREEAGR_STR-HIERARCHYNODEISORPHAN sy-vline 
WA_IWCGRPTREEAGR_STR-HIERARCHYNODEISCYCLEENDPOINT sy-vline 
WA_IWCGRPTREEAGR_STR-NUMBEROFWORKCENTERS sy-vline 
WA_IWCGRPTREEAGR_STR-PLANT sy-vline 
WA_IWCGRPTREEAGR_STR-SHIFTNOTETYPE sy-vline 
WA_IWCGRPTREEAGR_STR-SHIFTREPORTTYPE sy-vline 
WA_IWCGRPTREEAGR_STR-OBJECTDESCRIPTION sy-vline 
WA_IWCGRPTREEAGR_STR-WRKCTRGRPDRILLSTATE sy-vline 
WA_IWCGRPTREEAGR_STR-WORKCENTERASSGMTISDIRECT sy-vline 
WA_IWCGRPTREEAGR_STR-WORKCENTERGROUPTYPE sy-vline 
WA_IWCGRPTREEAGR_STR-WORKCENTERGROUPTYPEDESCRIPTION sy-vline 
WA_IWCGRPTREEAGR_STR-WORKCENTERGROUPROOTTYPE sy-vline 
WA_IWCGRPTREEAGR_STR-WORKCENTERGROUPROOTTYPEDESC sy-vline      INTO ld_text SEPARATED BY SPACE.

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