ABAP Select data from SAP table TAGTREEVIEW into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM TAGTREEVIEW
*  INTO TABLE @DATA(IT_TAGTREEVIEW2).
*--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_TAGTREEVIEW INDEX 1 INTO DATA(WA_TAGTREEVIEW2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<TAGTREEVIEW>-CLIENT = 1.
<TAGTREEVIEW>-TREEID = 1.
<TAGTREEVIEW>-PARENTID = 1.
<TAGTREEVIEW>-CHILDID = 1.
<TAGTREEVIEW>-IMG = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_TAGTREEVIEW-LINK, sy-vline,
  WA_TAGTREEVIEW-TEXT, sy-vline,
  WA_TAGTREEVIEW-TLEVEL, sy-vline,
  WA_TAGTREEVIEW-STATUS, sy-vline,
  WA_TAGTREEVIEW-SIBLID, sy-vline,
ENDLOOP.
   
*Add any further fields from structure WA_TAGTREEVIEW 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_TAGTREEVIEW 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_TAGTREEVIEW INTO WA_TAGTREEVIEW.


*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_TAGTREEVIEW_STR, 
CLIENT TYPE STRING,
TREEID TYPE STRING,
PARENTID TYPE STRING,
CHILDID TYPE STRING,
IMG TYPE STRING,
LINK TYPE STRING,
TEXT TYPE STRING,
TLEVEL TYPE STRING,
STATUS TYPE STRING,
SIBLID TYPE STRING,END OF T_EKKO_STR.
DATA: WA_TAGTREEVIEW_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_TAGTREEVIEW_STR-CLIENT sy-vline 
WA_TAGTREEVIEW_STR-TREEID sy-vline 
WA_TAGTREEVIEW_STR-PARENTID sy-vline 
WA_TAGTREEVIEW_STR-CHILDID sy-vline 
WA_TAGTREEVIEW_STR-IMG sy-vline 
WA_TAGTREEVIEW_STR-LINK sy-vline 
WA_TAGTREEVIEW_STR-TEXT sy-vline 
WA_TAGTREEVIEW_STR-TLEVEL sy-vline 
WA_TAGTREEVIEW_STR-STATUS sy-vline 
WA_TAGTREEVIEW_STR-SIBLID sy-vline      INTO ld_text SEPARATED BY SPACE.

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