ABAP Select data from SAP table DNODE into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM DNODE
*  INTO TABLE @DATA(IT_DNODE2).
*--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_DNODE INDEX 1 INTO DATA(WA_DNODE2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<DNODE>-NODE_KEY = 1.
<DNODE>-TYPE = 1.
<DNODE>-ISMNR = 1.
<DNODE>-ISMVR = 1.
<DNODE>-ISLNR = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_DNODE-ISLVR, sy-vline,
  WA_DNODE-ITEMNR, sy-vline,
  WA_DNODE-OPCNT, sy-vline,
  WA_DNODE-PRCNT, sy-vline,
  WA_DNODE-CACNT, sy-vline,
  WA_DNODE-TKCNT, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_DNODE 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_DNODE 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_DNODE INTO WA_DNODE.


*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.

*Conversion exit ALPHA, internal->external for field ISMNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_DNODE-ISMNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_DNODE-ISMNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field ISLNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_DNODE-ISLNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_DNODE-ISLNR.
WRITE:/ 'New Value:', ld_input.
ENDFORM. 

*&---------------------------------------------------------------------*
*& Form process_as_string_field_values
*&---------------------------------------------------------------------*
FORM process_as_string_field_values CHANGING p_EKKO LIKE wa_EKKO.

TYPES: BEGIN OF T_DNODE_STR, 
NODE_KEY TYPE STRING,
TYPE TYPE STRING,
ISMNR TYPE STRING,
ISMVR TYPE STRING,
ISLNR TYPE STRING,
ISLVR TYPE STRING,
ITEMNR TYPE STRING,
OPCNT TYPE STRING,
PRCNT TYPE STRING,
CACNT TYPE STRING,
TKCNT TYPE STRING,
ACTCNT TYPE STRING,
ATTCNT TYPE STRING,
CGROUP TYPE STRING,
CODE TYPE STRING,
OBJTYP TYPE STRING,
OBJKEY TYPE STRING,
ATTLOC TYPE STRING,END OF T_EKKO_STR.
DATA: WA_DNODE_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_DNODE_STR-NODE_KEY sy-vline 
WA_DNODE_STR-TYPE sy-vline 
WA_DNODE_STR-ISMNR sy-vline 
WA_DNODE_STR-ISMVR sy-vline 
WA_DNODE_STR-ISLNR sy-vline 
WA_DNODE_STR-ISLVR sy-vline 
WA_DNODE_STR-ITEMNR sy-vline 
WA_DNODE_STR-OPCNT sy-vline 
WA_DNODE_STR-PRCNT sy-vline 
WA_DNODE_STR-CACNT sy-vline 
WA_DNODE_STR-TKCNT sy-vline 
WA_DNODE_STR-ACTCNT sy-vline 
WA_DNODE_STR-ATTCNT sy-vline 
WA_DNODE_STR-CGROUP sy-vline 
WA_DNODE_STR-CODE sy-vline 
WA_DNODE_STR-OBJTYP sy-vline 
WA_DNODE_STR-OBJKEY sy-vline 
WA_DNODE_STR-ATTLOC sy-vline      INTO ld_text SEPARATED BY SPACE.

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