ABAP Select data from SAP table NSDM_S_HEADER into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM NSDM_S_HEADER
*  INTO TABLE @DATA(IT_NSDM_S_HEADER2).
*--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_NSDM_S_HEADER INDEX 1 INTO DATA(WA_NSDM_S_HEADER2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<NSDM_S_HEADER>-BLART = 1.
<NSDM_S_HEADER>-BLAUM = 1.
<NSDM_S_HEADER>-TCODE = 1.
<NSDM_S_HEADER>-BKTXT = 1.
<NSDM_S_HEADER>-FRATH = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_NSDM_S_HEADER-FRBNR, sy-vline,
  WA_NSDM_S_HEADER-WEVER, sy-vline,
  WA_NSDM_S_HEADER-XABLN, sy-vline,
  WA_NSDM_S_HEADER-AWSYS, sy-vline,
  WA_NSDM_S_HEADER-BLA2D, sy-vline,
  WA_NSDM_S_HEADER-BFWMS, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_NSDM_S_HEADER 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_NSDM_S_HEADER 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_NSDM_S_HEADER INTO WA_NSDM_S_HEADER.


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

*Conversion exit ALPHA, internal->external for field AWSYS
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_NSDM_S_HEADER-AWSYS
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_NSDM_S_HEADER-AWSYS.
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_NSDM_S_HEADER_STR, 
BLART TYPE STRING,
BLAUM TYPE STRING,
TCODE TYPE STRING,
BKTXT TYPE STRING,
FRATH TYPE STRING,
FRBNR TYPE STRING,
WEVER TYPE STRING,
XABLN TYPE STRING,
AWSYS TYPE STRING,
BLA2D TYPE STRING,
BFWMS TYPE STRING,
VGART TYPE STRING,
USNAM TYPE STRING,
TCODE2 TYPE STRING,
EXNUM TYPE STRING,
GTS_CUSREF_NO TYPE STRING,
FLS_RSTO TYPE STRING,
MSR_ACTIVE TYPE STRING,
XCOMPL TYPE STRING,
KNUMV TYPE STRING,END OF T_EKKO_STR.
DATA: WA_NSDM_S_HEADER_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_NSDM_S_HEADER_STR-BLART sy-vline 
WA_NSDM_S_HEADER_STR-BLAUM sy-vline 
WA_NSDM_S_HEADER_STR-TCODE sy-vline 
WA_NSDM_S_HEADER_STR-BKTXT sy-vline 
WA_NSDM_S_HEADER_STR-FRATH sy-vline 
WA_NSDM_S_HEADER_STR-FRBNR sy-vline 
WA_NSDM_S_HEADER_STR-WEVER sy-vline 
WA_NSDM_S_HEADER_STR-XABLN sy-vline 
WA_NSDM_S_HEADER_STR-AWSYS sy-vline 
WA_NSDM_S_HEADER_STR-BLA2D sy-vline 
WA_NSDM_S_HEADER_STR-BFWMS sy-vline 
WA_NSDM_S_HEADER_STR-VGART sy-vline 
WA_NSDM_S_HEADER_STR-USNAM sy-vline 
WA_NSDM_S_HEADER_STR-TCODE2 sy-vline 
WA_NSDM_S_HEADER_STR-EXNUM sy-vline 
WA_NSDM_S_HEADER_STR-GTS_CUSREF_NO sy-vline 
WA_NSDM_S_HEADER_STR-FLS_RSTO sy-vline 
WA_NSDM_S_HEADER_STR-MSR_ACTIVE sy-vline 
WA_NSDM_S_HEADER_STR-XCOMPL sy-vline 
WA_NSDM_S_HEADER_STR-KNUMV sy-vline      INTO ld_text SEPARATED BY SPACE.

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