ABAP Select data from SAP table RHVG_NODES into internal table

Get Example source ABAP code based on a different SAP table
  Get ABAP code

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM RHVG_NODES
*  INTO TABLE @DATA(IT_RHVG_NODES2).
*--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_RHVG_NODES INDEX 1 INTO DATA(WA_RHVG_NODES2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<RHVG_NODES>-ID = 1.
<RHVG_NODES>-PLVAR = 1.
<RHVG_NODES>-OTYPE = 1.
<RHVG_NODES>-OBJID = 1.
<RHVG_NODES>-BEGDA = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_RHVG_NODES-ENDDA, sy-vline,
  WA_RHVG_NODES-ISTAT, sy-vline,
  WA_RHVG_NODES-HISTO, sy-vline,
  WA_RHVG_NODES-SHORT, sy-vline,
  WA_RHVG_NODES-STEXT, sy-vline,
  WA_RHVG_NODES-REALO, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_RHVG_NODES 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_RHVG_NODES 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_RHVG_NODES INTO WA_RHVG_NODES.


*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_RHVG_NODES_STR, 
ID TYPE STRING,
PLVAR TYPE STRING,
OTYPE TYPE STRING,
OBJID TYPE STRING,
BEGDA TYPE STRING,
ENDDA TYPE STRING,
ISTAT TYPE STRING,
HISTO TYPE STRING,
SHORT TYPE STRING,
STEXT TYPE STRING,
REALO TYPE STRING,
BEGTI TYPE STRING,
ENDTI TYPE STRING,
BOXES_IDX TYPE STRING,END OF T_EKKO_STR.
DATA: WA_RHVG_NODES_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_RHVG_NODES_STR-ID sy-vline 
WA_RHVG_NODES_STR-PLVAR sy-vline 
WA_RHVG_NODES_STR-OTYPE sy-vline 
WA_RHVG_NODES_STR-OBJID sy-vline 
WA_RHVG_NODES_STR-BEGDA sy-vline 
WA_RHVG_NODES_STR-ENDDA sy-vline 
WA_RHVG_NODES_STR-ISTAT sy-vline 
WA_RHVG_NODES_STR-HISTO sy-vline 
WA_RHVG_NODES_STR-SHORT sy-vline 
WA_RHVG_NODES_STR-STEXT sy-vline 
WA_RHVG_NODES_STR-REALO sy-vline 
WA_RHVG_NODES_STR-BEGTI sy-vline 
WA_RHVG_NODES_STR-ENDTI sy-vline 
WA_RHVG_NODES_STR-BOXES_IDX sy-vline      INTO ld_text SEPARATED BY SPACE.

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