ABAP Select data from SAP table KCRP1_NAVIGATION_TREE into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP KCRP1_NAVIGATION_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 KCRP1_NAVIGATION_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 KCRP1_NAVIGATION_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_KCRP1_NAVIGATION_TREE TYPE STANDARD TABLE OF KCRP1_NAVIGATION_TREE,
      WA_KCRP1_NAVIGATION_TREE TYPE KCRP1_NAVIGATION_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: <KCRP1_NAVIGATION_TREE> TYPE KCRP1_NAVIGATION_TREE.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_KCRP1_NAVIGATION_TREE.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM KCRP1_NAVIGATION_TREE
  INTO TABLE IT_KCRP1_NAVIGATION_TREE.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM KCRP1_NAVIGATION_TREE
*  INTO TABLE @DATA(IT_KCRP1_NAVIGATION_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_KCRP1_NAVIGATION_TREE INDEX 1 INTO DATA(WA_KCRP1_NAVIGATION_TREE2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_KCRP1_NAVIGATION_TREE ASSIGNING <KCRP1_NAVIGATION_TREE>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<KCRP1_NAVIGATION_TREE>-NODE_KEY = 1.
<KCRP1_NAVIGATION_TREE>-RELAT_KEY = 1.
<KCRP1_NAVIGATION_TREE>-NAME = 1.
<KCRP1_NAVIGATION_TREE>-COLUMN2 = 1.
<KCRP1_NAVIGATION_TREE>-COLUMN3 = 1.

ENDLOOP.

LOOP AT IT_KCRP1_NAVIGATION_TREE INTO WA_KCRP1_NAVIGATION_TREE.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_KCRP1_NAVIGATION_TREE-COLUMN4, sy-vline,
  WA_KCRP1_NAVIGATION_TREE-COLUMN5, sy-vline,
  WA_KCRP1_NAVIGATION_TREE-COLUMN6, sy-vline,
  WA_KCRP1_NAVIGATION_TREE-COLUMN7, sy-vline,
  WA_KCRP1_NAVIGATION_TREE-COLUMN8, sy-vline,
  WA_KCRP1_NAVIGATION_TREE-COLUMN9, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_KCRP1_NAVIGATION_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_KCRP1_NAVIGATION_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_KCRP1_NAVIGATION_TREE INTO WA_KCRP1_NAVIGATION_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_KCRP1_NAVIGATION_TREE_STR, 
NODE_KEY TYPE STRING,
RELAT_KEY TYPE STRING,
NAME TYPE STRING,
COLUMN2 TYPE STRING,
COLUMN3 TYPE STRING,
COLUMN4 TYPE STRING,
COLUMN5 TYPE STRING,
COLUMN6 TYPE STRING,
COLUMN7 TYPE STRING,
COLUMN8 TYPE STRING,
COLUMN9 TYPE STRING,END OF T_EKKO_STR.
DATA: WA_KCRP1_NAVIGATION_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_KCRP1_NAVIGATION_TREE_STR-NODE_KEY sy-vline 
WA_KCRP1_NAVIGATION_TREE_STR-RELAT_KEY sy-vline 
WA_KCRP1_NAVIGATION_TREE_STR-NAME sy-vline 
WA_KCRP1_NAVIGATION_TREE_STR-COLUMN2 sy-vline 
WA_KCRP1_NAVIGATION_TREE_STR-COLUMN3 sy-vline 
WA_KCRP1_NAVIGATION_TREE_STR-COLUMN4 sy-vline 
WA_KCRP1_NAVIGATION_TREE_STR-COLUMN5 sy-vline 
WA_KCRP1_NAVIGATION_TREE_STR-COLUMN6 sy-vline 
WA_KCRP1_NAVIGATION_TREE_STR-COLUMN7 sy-vline 
WA_KCRP1_NAVIGATION_TREE_STR-COLUMN8 sy-vline 
WA_KCRP1_NAVIGATION_TREE_STR-COLUMN9 sy-vline      INTO ld_text SEPARATED BY SPACE.

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