ABAP Select data from SAP table /ISDFPS/NSN_ID into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP /ISDFPS/NSN_ID 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 /ISDFPS/NSN_ID. 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 /ISDFPS/NSN_ID 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_/ISDFPS/NSN_ID TYPE STANDARD TABLE OF /ISDFPS/NSN_ID,
      WA_/ISDFPS/NSN_ID TYPE /ISDFPS/NSN_ID,
      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: </ISDFPS/NSN_ID> TYPE /ISDFPS/NSN_ID.

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

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM /ISDFPS/NSN_ID
  INTO TABLE IT_/ISDFPS/NSN_ID.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM /ISDFPS/NSN_ID
*  INTO TABLE @DATA(IT_/ISDFPS/NSN_ID2).
*--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_/ISDFPS/NSN_ID INDEX 1 INTO DATA(WA_/ISDFPS/NSN_ID2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_/ISDFPS/NSN_ID ASSIGNING </ISDFPS/NSN_ID>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
</ISDFPS/NSN_ID>-MANDT = 1.
</ISDFPS/NSN_ID>-NSNID = 1.
</ISDFPS/NSN_ID>-NSNGC = 1.
</ISDFPS/NSN_ID>-INC = 1.
</ISDFPS/NSN_ID>-ACTIVE = 1.

ENDLOOP.

LOOP AT IT_/ISDFPS/NSN_ID INTO WA_/ISDFPS/NSN_ID.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_/ISDFPS/NSN_ID-ERSDA, sy-vline,
  WA_/ISDFPS/NSN_ID-ERNAM, sy-vline,
  WA_/ISDFPS/NSN_ID-AENAM, sy-vline,
  WA_/ISDFPS/NSN_ID-LAEDA, sy-vline,
  WA_/ISDFPS/NSN_ID-NIIN_SC, sy-vline,
  WA_/ISDFPS/NSN_ID-DEMIL_CODE, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_/ISDFPS/NSN_ID 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_/ISDFPS/NSN_ID 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_/ISDFPS/NSN_ID INTO WA_/ISDFPS/NSN_ID.


*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_/ISDFPS/NSN_ID_STR, 
MANDT TYPE STRING,
NSNID TYPE STRING,
NSNGC TYPE STRING,
INC TYPE STRING,
ACTIVE TYPE STRING,
ERSDA TYPE STRING,
ERNAM TYPE STRING,
AENAM TYPE STRING,
LAEDA TYPE STRING,
NIIN_SC TYPE STRING,
DEMIL_CODE TYPE STRING,
RNCC TYPE STRING,
RNVC TYPE STRING,
RPLG_NCB_CD_IIN_ID TYPE STRING,END OF T_EKKO_STR.
DATA: WA_/ISDFPS/NSN_ID_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_/ISDFPS/NSN_ID_STR-MANDT sy-vline 
WA_/ISDFPS/NSN_ID_STR-NSNID sy-vline 
WA_/ISDFPS/NSN_ID_STR-NSNGC sy-vline 
WA_/ISDFPS/NSN_ID_STR-INC sy-vline 
WA_/ISDFPS/NSN_ID_STR-ACTIVE sy-vline 
WA_/ISDFPS/NSN_ID_STR-ERSDA sy-vline 
WA_/ISDFPS/NSN_ID_STR-ERNAM sy-vline 
WA_/ISDFPS/NSN_ID_STR-AENAM sy-vline 
WA_/ISDFPS/NSN_ID_STR-LAEDA sy-vline 
WA_/ISDFPS/NSN_ID_STR-NIIN_SC sy-vline 
WA_/ISDFPS/NSN_ID_STR-DEMIL_CODE sy-vline 
WA_/ISDFPS/NSN_ID_STR-RNCC sy-vline 
WA_/ISDFPS/NSN_ID_STR-RNVC sy-vline 
WA_/ISDFPS/NSN_ID_STR-RPLG_NCB_CD_IIN_ID sy-vline      INTO ld_text SEPARATED BY SPACE.

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