ABAP Select data from SAP table EWAEL_TREEV_NODE into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM EWAEL_TREEV_NODE
*  INTO TABLE @DATA(IT_EWAEL_TREEV_NODE2).
*--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_EWAEL_TREEV_NODE INDEX 1 INTO DATA(WA_EWAEL_TREEV_NODE2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<EWAEL_TREEV_NODE>-NODE_KEY = 1.
<EWAEL_TREEV_NODE>-PARENT_KEY = 1.
<EWAEL_TREEV_NODE>-TYPE = 1.
<EWAEL_TREEV_NODE>-DATA = 1.
<EWAEL_TREEV_NODE>-FIELDS = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_EWAEL_TREEV_NODE-APPTYPE, sy-vline,
  WA_EWAEL_TREEV_NODE-CHECKED, sy-vline,
  WA_EWAEL_TREEV_NODE-CHECKBOX, sy-vline,
  WA_EWAEL_TREEV_NODE-COLOR, sy-vline,
  WA_EWAEL_TREEV_NODE-FOLDER, sy-vline,
  WA_EWAEL_TREEV_NODE-INITIAL_OPENED, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_EWAEL_TREEV_NODE 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_EWAEL_TREEV_NODE 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_EWAEL_TREEV_NODE INTO WA_EWAEL_TREEV_NODE.


*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_EWAEL_TREEV_NODE_STR, 
NODE_KEY TYPE STRING,
PARENT_KEY TYPE STRING,
TYPE TYPE STRING,
DATA TYPE STRING,
FIELDS TYPE STRING,
APPTYPE TYPE STRING,
CHECKED TYPE STRING,
CHECKBOX TYPE STRING,
COLOR TYPE STRING,
FOLDER TYPE STRING,
INITIAL_OPENED TYPE STRING,
SELECTED TYPE STRING,
DESTROYING TYPE STRING,
DEPTH TYPE STRING,
DATAREF TYPE STRING,
OBJREF TYPE STRING,
PARENTREF TYPE STRING,
CTRLSTATE TYPE STRING,
CTRLNEEDED TYPE STRING,
CTRLINDEX TYPE STRING,END OF T_EKKO_STR.
DATA: WA_EWAEL_TREEV_NODE_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_EWAEL_TREEV_NODE_STR-NODE_KEY sy-vline 
WA_EWAEL_TREEV_NODE_STR-PARENT_KEY sy-vline 
WA_EWAEL_TREEV_NODE_STR-TYPE sy-vline 
WA_EWAEL_TREEV_NODE_STR-DATA sy-vline 
WA_EWAEL_TREEV_NODE_STR-FIELDS sy-vline 
WA_EWAEL_TREEV_NODE_STR-APPTYPE sy-vline 
WA_EWAEL_TREEV_NODE_STR-CHECKED sy-vline 
WA_EWAEL_TREEV_NODE_STR-CHECKBOX sy-vline 
WA_EWAEL_TREEV_NODE_STR-COLOR sy-vline 
WA_EWAEL_TREEV_NODE_STR-FOLDER sy-vline 
WA_EWAEL_TREEV_NODE_STR-INITIAL_OPENED sy-vline 
WA_EWAEL_TREEV_NODE_STR-SELECTED sy-vline 
WA_EWAEL_TREEV_NODE_STR-DESTROYING sy-vline 
WA_EWAEL_TREEV_NODE_STR-DEPTH sy-vline 
WA_EWAEL_TREEV_NODE_STR-DATAREF sy-vline 
WA_EWAEL_TREEV_NODE_STR-OBJREF sy-vline 
WA_EWAEL_TREEV_NODE_STR-PARENTREF sy-vline 
WA_EWAEL_TREEV_NODE_STR-CTRLSTATE sy-vline 
WA_EWAEL_TREEV_NODE_STR-CTRLNEEDED sy-vline 
WA_EWAEL_TREEV_NODE_STR-CTRLINDEX sy-vline      INTO ld_text SEPARATED BY SPACE.

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