ABAP Select data from SAP table /SCWM/S_SP_A_ITEM_DG into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM /SCWM/S_SP_A_ITEM_DG
*  INTO TABLE @DATA(IT_/SCWM/S_SP_A_ITEM_DG2).
*--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_/SCWM/S_SP_A_ITEM_DG INDEX 1 INTO DATA(WA_/SCWM/S_SP_A_ITEM_DG2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
</SCWM/S_SP_A_ITEM_DG>-DOCID = 1.
</SCWM/S_SP_A_ITEM_DG>-ITEMID = 1.
</SCWM/S_SP_A_ITEM_DG>-COUNTER = 1.
</SCWM/S_SP_A_ITEM_DG>-LWDG = 1.
</SCWM/S_SP_A_ITEM_DG>-DGCL = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_/SCWM/S_SP_A_ITEM_DG-TKUI, sy-vline,
  WA_/SCWM/S_SP_A_ITEM_DG-DGNU, sy-vline,
  WA_/SCWM/S_SP_A_ITEM_DG-HNU, sy-vline,
  WA_/SCWM/S_SP_A_ITEM_DG-HPN1, sy-vline,
  WA_/SCWM/S_SP_A_ITEM_DG-HPN2, sy-vline,
  WA_/SCWM/S_SP_A_ITEM_DG-HPN3, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_/SCWM/S_SP_A_ITEM_DG 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_/SCWM/S_SP_A_ITEM_DG 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_/SCWM/S_SP_A_ITEM_DG INTO WA_/SCWM/S_SP_A_ITEM_DG.


*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 VOL_UNI
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_/SCWM/S_SP_A_ITEM_DG-VOL_UNI
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_/SCWM/S_SP_A_ITEM_DG-VOL_UNI.
WRITE:/ 'New Value:', ld_input.

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

*Conversion exit EHSMA, internal->external for field DG_MATNR
CALL FUNCTION 'CONVERSION_EXIT_EHSMA_OUTPUT'
  EXPORTING
    input =                      WA_/SCWM/S_SP_A_ITEM_DG-DG_MATNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_/SCWM/S_SP_A_ITEM_DG-DG_MATNR.
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_/SCWM/S_SP_A_ITEM_DG_STR, 
DOCID TYPE STRING,
ITEMID TYPE STRING,
COUNTER TYPE STRING,
LWDG TYPE STRING,
DGCL TYPE STRING,
TKUI TYPE STRING,
DGNU TYPE STRING,
HNU TYPE STRING,
HPN1 TYPE STRING,
HPN2 TYPE STRING,
HPN3 TYPE STRING,
HPN4 TYPE STRING,
CARR_TYPE TYPE STRING,
PGRO TYPE STRING,
PACKCODE TYPE STRING,
VOL_VAL TYPE STRING,
VOL_UNI TYPE STRING,
WEI_VAL TYPE STRING,
WEI_UNI TYPE STRING,
DG_MATNR TYPE STRING,END OF T_EKKO_STR.
DATA: WA_/SCWM/S_SP_A_ITEM_DG_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_/SCWM/S_SP_A_ITEM_DG_STR-DOCID sy-vline 
WA_/SCWM/S_SP_A_ITEM_DG_STR-ITEMID sy-vline 
WA_/SCWM/S_SP_A_ITEM_DG_STR-COUNTER sy-vline 
WA_/SCWM/S_SP_A_ITEM_DG_STR-LWDG sy-vline 
WA_/SCWM/S_SP_A_ITEM_DG_STR-DGCL sy-vline 
WA_/SCWM/S_SP_A_ITEM_DG_STR-TKUI sy-vline 
WA_/SCWM/S_SP_A_ITEM_DG_STR-DGNU sy-vline 
WA_/SCWM/S_SP_A_ITEM_DG_STR-HNU sy-vline 
WA_/SCWM/S_SP_A_ITEM_DG_STR-HPN1 sy-vline 
WA_/SCWM/S_SP_A_ITEM_DG_STR-HPN2 sy-vline 
WA_/SCWM/S_SP_A_ITEM_DG_STR-HPN3 sy-vline 
WA_/SCWM/S_SP_A_ITEM_DG_STR-HPN4 sy-vline 
WA_/SCWM/S_SP_A_ITEM_DG_STR-CARR_TYPE sy-vline 
WA_/SCWM/S_SP_A_ITEM_DG_STR-PGRO sy-vline 
WA_/SCWM/S_SP_A_ITEM_DG_STR-PACKCODE sy-vline 
WA_/SCWM/S_SP_A_ITEM_DG_STR-VOL_VAL sy-vline 
WA_/SCWM/S_SP_A_ITEM_DG_STR-VOL_UNI sy-vline 
WA_/SCWM/S_SP_A_ITEM_DG_STR-WEI_VAL sy-vline 
WA_/SCWM/S_SP_A_ITEM_DG_STR-WEI_UNI sy-vline 
WA_/SCWM/S_SP_A_ITEM_DG_STR-DG_MATNR sy-vline      INTO ld_text SEPARATED BY SPACE.

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