ABAP Select data from SAP table RDM_S_FCAT_TREE into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM RDM_S_FCAT_TREE
*  INTO TABLE @DATA(IT_RDM_S_FCAT_TREE2).
*--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_RDM_S_FCAT_TREE INDEX 1 INTO DATA(WA_RDM_S_FCAT_TREE2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<RDM_S_FCAT_TREE>-HIER_ID = 1.
<RDM_S_FCAT_TREE>-HIER_TYPE = 1.
<RDM_S_FCAT_TREE>-NODE = 1.
<RDM_S_FCAT_TREE>-NODE_TEXT = 1.
<RDM_S_FCAT_TREE>-TREE_LEVEL_AH = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_RDM_S_FCAT_TREE-TREE_LEVEL_MC, sy-vline,
  WA_RDM_S_FCAT_TREE-PARENT, sy-vline,
  WA_RDM_S_FCAT_TREE-BASE_PRICING, sy-vline,
  WA_RDM_S_FCAT_TREE-STATUS_BASE_PRIC, sy-vline,
  WA_RDM_S_FCAT_TREE-PROMOTION, sy-vline,
  WA_RDM_S_FCAT_TREE-STATUS_PROMOTION, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_RDM_S_FCAT_TREE 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_RDM_S_FCAT_TREE 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_RDM_S_FCAT_TREE INTO WA_RDM_S_FCAT_TREE.


*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_RDM_S_FCAT_TREE_STR, 
HIER_ID TYPE STRING,
HIER_TYPE TYPE STRING,
NODE TYPE STRING,
NODE_TEXT TYPE STRING,
TREE_LEVEL_AH TYPE STRING,
TREE_LEVEL_MC TYPE STRING,
PARENT TYPE STRING,
BASE_PRICING TYPE STRING,
STATUS_BASE_PRIC TYPE STRING,
PROMOTION TYPE STRING,
STATUS_PROMOTION TYPE STRING,
MARKDOWN TYPE STRING,
STATUS_MARKDOWN TYPE STRING,
PML TYPE STRING,
STATUS_PML TYPE STRING,END OF T_EKKO_STR.
DATA: WA_RDM_S_FCAT_TREE_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_RDM_S_FCAT_TREE_STR-HIER_ID sy-vline 
WA_RDM_S_FCAT_TREE_STR-HIER_TYPE sy-vline 
WA_RDM_S_FCAT_TREE_STR-NODE sy-vline 
WA_RDM_S_FCAT_TREE_STR-NODE_TEXT sy-vline 
WA_RDM_S_FCAT_TREE_STR-TREE_LEVEL_AH sy-vline 
WA_RDM_S_FCAT_TREE_STR-TREE_LEVEL_MC sy-vline 
WA_RDM_S_FCAT_TREE_STR-PARENT sy-vline 
WA_RDM_S_FCAT_TREE_STR-BASE_PRICING sy-vline 
WA_RDM_S_FCAT_TREE_STR-STATUS_BASE_PRIC sy-vline 
WA_RDM_S_FCAT_TREE_STR-PROMOTION sy-vline 
WA_RDM_S_FCAT_TREE_STR-STATUS_PROMOTION sy-vline 
WA_RDM_S_FCAT_TREE_STR-MARKDOWN sy-vline 
WA_RDM_S_FCAT_TREE_STR-STATUS_MARKDOWN sy-vline 
WA_RDM_S_FCAT_TREE_STR-PML sy-vline 
WA_RDM_S_FCAT_TREE_STR-STATUS_PML sy-vline      INTO ld_text SEPARATED BY SPACE.

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