ABAP Select data from SAP table HSMS_DNDATA into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM HSMS_DNDATA
*  INTO TABLE @DATA(IT_HSMS_DNDATA2).
*--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_HSMS_DNDATA INDEX 1 INTO DATA(WA_HSMS_DNDATA2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<HSMS_DNDATA>-NUMTYPE = 1.
<HSMS_DNDATA>-AVGVAL = 1.
<HSMS_DNDATA>-AVGVALFLG = 1.
<HSMS_DNDATA>-AVGDEC = 1.
<HSMS_DNDATA>-LOWOP = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_HSMS_DNDATA-LOWVAL, sy-vline,
  WA_HSMS_DNDATA-LOWVALFLG, sy-vline,
  WA_HSMS_DNDATA-LOWDEC, sy-vline,
  WA_HSMS_DNDATA-UPPOP, sy-vline,
  WA_HSMS_DNDATA-UPPVAL, sy-vline,
  WA_HSMS_DNDATA-UPPVALFLG, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_HSMS_DNDATA 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_HSMS_DNDATA 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_HSMS_DNDATA INTO WA_HSMS_DNDATA.


*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 CUNIT, internal->external for field UNIT
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_HSMS_DNDATA-UNIT
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_HSMS_DNDATA-UNIT.
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_HSMS_DNDATA_STR, 
NUMTYPE TYPE STRING,
AVGVAL TYPE STRING,
AVGVALFLG TYPE STRING,
AVGDEC TYPE STRING,
LOWOP TYPE STRING,
LOWVAL TYPE STRING,
LOWVALFLG TYPE STRING,
LOWDEC TYPE STRING,
UPPOP TYPE STRING,
UPPVAL TYPE STRING,
UPPVALFLG TYPE STRING,
UPPDEC TYPE STRING,
UNIT TYPE STRING,END OF T_EKKO_STR.
DATA: WA_HSMS_DNDATA_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_HSMS_DNDATA_STR-NUMTYPE sy-vline 
WA_HSMS_DNDATA_STR-AVGVAL sy-vline 
WA_HSMS_DNDATA_STR-AVGVALFLG sy-vline 
WA_HSMS_DNDATA_STR-AVGDEC sy-vline 
WA_HSMS_DNDATA_STR-LOWOP sy-vline 
WA_HSMS_DNDATA_STR-LOWVAL sy-vline 
WA_HSMS_DNDATA_STR-LOWVALFLG sy-vline 
WA_HSMS_DNDATA_STR-LOWDEC sy-vline 
WA_HSMS_DNDATA_STR-UPPOP sy-vline 
WA_HSMS_DNDATA_STR-UPPVAL sy-vline 
WA_HSMS_DNDATA_STR-UPPVALFLG sy-vline 
WA_HSMS_DNDATA_STR-UPPDEC sy-vline 
WA_HSMS_DNDATA_STR-UNIT sy-vline      INTO ld_text SEPARATED BY SPACE.

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