ABAP Select data from SAP table RHPE_WWW_TREE_BUFFER into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM RHPE_WWW_TREE_BUFFER
*  INTO TABLE @DATA(IT_RHPE_WWW_TREE_BUFFER2).
*--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_RHPE_WWW_TREE_BUFFER INDEX 1 INTO DATA(WA_RHPE_WWW_TREE_BUFFER2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<RHPE_WWW_TREE_BUFFER>-NODE_KEY = 1.
<RHPE_WWW_TREE_BUFFER>-RELATKEY = 1.
<RHPE_WWW_TREE_BUFFER>-RELATSHIP = 1.
<RHPE_WWW_TREE_BUFFER>-HIDDEN = 1.
<RHPE_WWW_TREE_BUFFER>-DISABLED = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_RHPE_WWW_TREE_BUFFER-ISFOLDER, sy-vline,
  WA_RHPE_WWW_TREE_BUFFER-N_IMAGE, sy-vline,
  WA_RHPE_WWW_TREE_BUFFER-EXP_IMAGE, sy-vline,
  WA_RHPE_WWW_TREE_BUFFER-STYLE, sy-vline,
  WA_RHPE_WWW_TREE_BUFFER-LAST_HITEM, sy-vline,
  WA_RHPE_WWW_TREE_BUFFER-NO_BRANCH, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_RHPE_WWW_TREE_BUFFER 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_RHPE_WWW_TREE_BUFFER 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_RHPE_WWW_TREE_BUFFER INTO WA_RHPE_WWW_TREE_BUFFER.


*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_RHPE_WWW_TREE_BUFFER_STR, 
NODE_KEY TYPE STRING,
RELATKEY TYPE STRING,
RELATSHIP TYPE STRING,
HIDDEN TYPE STRING,
DISABLED TYPE STRING,
ISFOLDER TYPE STRING,
N_IMAGE TYPE STRING,
EXP_IMAGE TYPE STRING,
STYLE TYPE STRING,
LAST_HITEM TYPE STRING,
NO_BRANCH TYPE STRING,
EXPANDER TYPE STRING,
DRAGDROPID TYPE STRING,
TEXT TYPE STRING,
OTYPE TYPE STRING,
OBJID TYPE STRING,
FROM_DATE TYPE STRING,
TO_DATE TYPE STRING,
NODE_KEY_BROTHER TYPE STRING,
NODE_KEY_CHILD TYPE STRING,
LEVEL_STATUS TYPE STRING,
LEVEL TYPE STRING,
NODE_SENT TYPE STRING,END OF T_EKKO_STR.
DATA: WA_RHPE_WWW_TREE_BUFFER_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_RHPE_WWW_TREE_BUFFER_STR-NODE_KEY sy-vline 
WA_RHPE_WWW_TREE_BUFFER_STR-RELATKEY sy-vline 
WA_RHPE_WWW_TREE_BUFFER_STR-RELATSHIP sy-vline 
WA_RHPE_WWW_TREE_BUFFER_STR-HIDDEN sy-vline 
WA_RHPE_WWW_TREE_BUFFER_STR-DISABLED sy-vline 
WA_RHPE_WWW_TREE_BUFFER_STR-ISFOLDER sy-vline 
WA_RHPE_WWW_TREE_BUFFER_STR-N_IMAGE sy-vline 
WA_RHPE_WWW_TREE_BUFFER_STR-EXP_IMAGE sy-vline 
WA_RHPE_WWW_TREE_BUFFER_STR-STYLE sy-vline 
WA_RHPE_WWW_TREE_BUFFER_STR-LAST_HITEM sy-vline 
WA_RHPE_WWW_TREE_BUFFER_STR-NO_BRANCH sy-vline 
WA_RHPE_WWW_TREE_BUFFER_STR-EXPANDER sy-vline 
WA_RHPE_WWW_TREE_BUFFER_STR-DRAGDROPID sy-vline 
WA_RHPE_WWW_TREE_BUFFER_STR-TEXT sy-vline 
WA_RHPE_WWW_TREE_BUFFER_STR-OTYPE sy-vline 
WA_RHPE_WWW_TREE_BUFFER_STR-OBJID sy-vline 
WA_RHPE_WWW_TREE_BUFFER_STR-FROM_DATE sy-vline 
WA_RHPE_WWW_TREE_BUFFER_STR-TO_DATE sy-vline 
WA_RHPE_WWW_TREE_BUFFER_STR-NODE_KEY_BROTHER sy-vline 
WA_RHPE_WWW_TREE_BUFFER_STR-NODE_KEY_CHILD sy-vline 
WA_RHPE_WWW_TREE_BUFFER_STR-LEVEL_STATUS sy-vline 
WA_RHPE_WWW_TREE_BUFFER_STR-LEVEL sy-vline 
WA_RHPE_WWW_TREE_BUFFER_STR-NODE_SENT sy-vline      INTO ld_text SEPARATED BY SPACE.

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