ABAP Select data from SAP table WISP_HIERARCHY_TOPNODE into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM WISP_HIERARCHY_TOPNODE
*  INTO TABLE @DATA(IT_WISP_HIERARCHY_TOPNODE2).
*--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_WISP_HIERARCHY_TOPNODE INDEX 1 INTO DATA(WA_WISP_HIERARCHY_TOPNODE2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<WISP_HIERARCHY_TOPNODE>-PLHVS = 1.
<WISP_HIERARCHY_TOPNODE>-RELEF1 = 1.
<WISP_HIERARCHY_TOPNODE>-RELEF2 = 1.
<WISP_HIERARCHY_TOPNODE>-RELEF3 = 1.
<WISP_HIERARCHY_TOPNODE>-PRODF1 = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_WISP_HIERARCHY_TOPNODE-PRODF2, sy-vline,
  WA_WISP_HIERARCHY_TOPNODE-PRODF3, sy-vline,
  WA_WISP_HIERARCHY_TOPNODE-PLMHT, sy-vline,
  WA_WISP_HIERARCHY_TOPNODE-SPRED_3, sy-vline,
  WA_WISP_HIERARCHY_TOPNODE-SPRED_7, sy-vline,
  WA_WISP_HIERARCHY_TOPNODE-FLGBASME, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_WISP_HIERARCHY_TOPNODE 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_WISP_HIERARCHY_TOPNODE 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_WISP_HIERARCHY_TOPNODE INTO WA_WISP_HIERARCHY_TOPNODE.


*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 PLHVS
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_WISP_HIERARCHY_TOPNODE-PLHVS
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_WISP_HIERARCHY_TOPNODE-PLHVS.
WRITE:/ 'New Value:', ld_input.

*Conversion exit CUNIT, internal->external for field PLMHT
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_WISP_HIERARCHY_TOPNODE-PLMHT
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_WISP_HIERARCHY_TOPNODE-PLMHT.
WRITE:/ 'New Value:', ld_input.

*Conversion exit CUNIT, internal->external for field BASME
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_WISP_HIERARCHY_TOPNODE-BASME
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_WISP_HIERARCHY_TOPNODE-BASME.
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_WISP_HIERARCHY_TOPNODE_STR, 
PLHVS TYPE STRING,
RELEF1 TYPE STRING,
RELEF2 TYPE STRING,
RELEF3 TYPE STRING,
PRODF1 TYPE STRING,
PRODF2 TYPE STRING,
PRODF3 TYPE STRING,
PLMHT TYPE STRING,
SPRED_3 TYPE STRING,
SPRED_7 TYPE STRING,
FLGBASME TYPE STRING,
BASME TYPE STRING,
FACTOR TYPE STRING,END OF T_EKKO_STR.
DATA: WA_WISP_HIERARCHY_TOPNODE_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_WISP_HIERARCHY_TOPNODE_STR-PLHVS sy-vline 
WA_WISP_HIERARCHY_TOPNODE_STR-RELEF1 sy-vline 
WA_WISP_HIERARCHY_TOPNODE_STR-RELEF2 sy-vline 
WA_WISP_HIERARCHY_TOPNODE_STR-RELEF3 sy-vline 
WA_WISP_HIERARCHY_TOPNODE_STR-PRODF1 sy-vline 
WA_WISP_HIERARCHY_TOPNODE_STR-PRODF2 sy-vline 
WA_WISP_HIERARCHY_TOPNODE_STR-PRODF3 sy-vline 
WA_WISP_HIERARCHY_TOPNODE_STR-PLMHT sy-vline 
WA_WISP_HIERARCHY_TOPNODE_STR-SPRED_3 sy-vline 
WA_WISP_HIERARCHY_TOPNODE_STR-SPRED_7 sy-vline 
WA_WISP_HIERARCHY_TOPNODE_STR-FLGBASME sy-vline 
WA_WISP_HIERARCHY_TOPNODE_STR-BASME sy-vline 
WA_WISP_HIERARCHY_TOPNODE_STR-FACTOR sy-vline      INTO ld_text SEPARATED BY SPACE.

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