ABAP Select data from SAP table /SCWM/S_MQ_STOCK_DIFF 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_MQ_STOCK_DIFF 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_MQ_STOCK_DIFF. 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_MQ_STOCK_DIFF 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_MQ_STOCK_DIFF TYPE STANDARD TABLE OF /SCWM/S_MQ_STOCK_DIFF,
      WA_/SCWM/S_MQ_STOCK_DIFF TYPE /SCWM/S_MQ_STOCK_DIFF,
      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_MQ_STOCK_DIFF> TYPE /SCWM/S_MQ_STOCK_DIFF.

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM /SCWM/S_MQ_STOCK_DIFF
*  INTO TABLE @DATA(IT_/SCWM/S_MQ_STOCK_DIFF2).
*--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_MQ_STOCK_DIFF INDEX 1 INTO DATA(WA_/SCWM/S_MQ_STOCK_DIFF2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
</SCWM/S_MQ_STOCK_DIFF>-PI_YEAR = 1.
</SCWM/S_MQ_STOCK_DIFF>-PI_DOCNO = 1.
</SCWM/S_MQ_STOCK_DIFF>-PI_ITEMNO = 1.
</SCWM/S_MQ_STOCK_DIFF>-TANUM = 1.
</SCWM/S_MQ_STOCK_DIFF>-TAPOS = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_/SCWM/S_MQ_STOCK_DIFF-INSP_DOC_NUMBER, sy-vline,
  WA_/SCWM/S_MQ_STOCK_DIFF-INSP_DOC_ITEM, sy-vline,
  WA_/SCWM/S_MQ_STOCK_DIFF-DIRECTION, sy-vline,
  WA_/SCWM/S_MQ_STOCK_DIFF-IDX_STOCK, sy-vline,
  WA_/SCWM/S_MQ_STOCK_DIFF-GUID_STOCK, sy-vline,
  WA_/SCWM/S_MQ_STOCK_DIFF-GUID_HU, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_/SCWM/S_MQ_STOCK_DIFF 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_MQ_STOCK_DIFF 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_MQ_STOCK_DIFF INTO WA_/SCWM/S_MQ_STOCK_DIFF.


*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 GJAHR, internal->external for field PI_YEAR
CALL FUNCTION 'CONVERSION_EXIT_GJAHR_OUTPUT'
  EXPORTING
    input =                      WA_/SCWM/S_MQ_STOCK_DIFF-PI_YEAR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_/SCWM/S_MQ_STOCK_DIFF-PI_YEAR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field PI_DOCNO
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_/SCWM/S_MQ_STOCK_DIFF-PI_DOCNO
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_/SCWM/S_MQ_STOCK_DIFF-PI_DOCNO.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPH0, internal->external for field TANUM
CALL FUNCTION 'CONVERSION_EXIT_ALPH0_OUTPUT'
  EXPORTING
    input =                      WA_/SCWM/S_MQ_STOCK_DIFF-TANUM
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_/SCWM/S_MQ_STOCK_DIFF-TANUM.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPH0, internal->external for field TAPOS
CALL FUNCTION 'CONVERSION_EXIT_ALPH0_OUTPUT'
  EXPORTING
    input =                      WA_/SCWM/S_MQ_STOCK_DIFF-TAPOS
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_/SCWM/S_MQ_STOCK_DIFF-TAPOS.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field INSP_DOC_NUMBER
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_/SCWM/S_MQ_STOCK_DIFF-INSP_DOC_NUMBER
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_/SCWM/S_MQ_STOCK_DIFF-INSP_DOC_NUMBER.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field INSP_DOC_ITEM
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_/SCWM/S_MQ_STOCK_DIFF-INSP_DOC_ITEM
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_/SCWM/S_MQ_STOCK_DIFF-INSP_DOC_ITEM.
WRITE:/ 'New Value:', ld_input.

*Conversion exit HUID, internal->external for field HUIDENT
CALL FUNCTION 'CONVERSION_EXIT_HUID_OUTPUT'
  EXPORTING
    input =                      WA_/SCWM/S_MQ_STOCK_DIFF-HUIDENT
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_/SCWM/S_MQ_STOCK_DIFF-HUIDENT.
WRITE:/ 'New Value:', ld_input.

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

*Conversion exit CUNIT, internal->external for field CWUNIT
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_/SCWM/S_MQ_STOCK_DIFF-CWUNIT
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_/SCWM/S_MQ_STOCK_DIFF-CWUNIT.
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_MQ_STOCK_DIFF_STR, 
PI_YEAR TYPE STRING,
PI_DOCNO TYPE STRING,
PI_ITEMNO TYPE STRING,
TANUM TYPE STRING,
TAPOS TYPE STRING,
INSP_DOC_NUMBER TYPE STRING,
INSP_DOC_ITEM TYPE STRING,
DIRECTION TYPE STRING,
IDX_STOCK TYPE STRING,
GUID_STOCK TYPE STRING,
GUID_HU TYPE STRING,
HUIDENT TYPE STRING,
QUAN TYPE STRING,
UNIT TYPE STRING,
BUSCON TYPE STRING,
EXEC_STEP TYPE STRING,
EXCCODE TYPE STRING,
DOCCAT TYPE STRING,
DOCID TYPE STRING,
RDOCCAT TYPE STRING,
RDOCID TYPE STRING,
RITMID TYPE STRING,
QDOCCAT TYPE STRING,
QDOCID TYPE STRING,
QITMID TYPE STRING,
INSPTYP TYPE STRING,
INSPID TYPE STRING,
IDPLATE TYPE STRING,
CWQUAN TYPE STRING,
CWUNIT TYPE STRING,
CWEXACT TYPE STRING,
WDATU TYPE STRING,
VFDAT TYPE STRING,
COO TYPE STRING,END OF T_EKKO_STR.
DATA: WA_/SCWM/S_MQ_STOCK_DIFF_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_MQ_STOCK_DIFF_STR-PI_YEAR sy-vline 
WA_/SCWM/S_MQ_STOCK_DIFF_STR-PI_DOCNO sy-vline 
WA_/SCWM/S_MQ_STOCK_DIFF_STR-PI_ITEMNO sy-vline 
WA_/SCWM/S_MQ_STOCK_DIFF_STR-TANUM sy-vline 
WA_/SCWM/S_MQ_STOCK_DIFF_STR-TAPOS sy-vline 
WA_/SCWM/S_MQ_STOCK_DIFF_STR-INSP_DOC_NUMBER sy-vline 
WA_/SCWM/S_MQ_STOCK_DIFF_STR-INSP_DOC_ITEM sy-vline 
WA_/SCWM/S_MQ_STOCK_DIFF_STR-DIRECTION sy-vline 
WA_/SCWM/S_MQ_STOCK_DIFF_STR-IDX_STOCK sy-vline 
WA_/SCWM/S_MQ_STOCK_DIFF_STR-GUID_STOCK sy-vline 
WA_/SCWM/S_MQ_STOCK_DIFF_STR-GUID_HU sy-vline 
WA_/SCWM/S_MQ_STOCK_DIFF_STR-HUIDENT sy-vline 
WA_/SCWM/S_MQ_STOCK_DIFF_STR-QUAN sy-vline 
WA_/SCWM/S_MQ_STOCK_DIFF_STR-UNIT sy-vline 
WA_/SCWM/S_MQ_STOCK_DIFF_STR-BUSCON sy-vline 
WA_/SCWM/S_MQ_STOCK_DIFF_STR-EXEC_STEP sy-vline 
WA_/SCWM/S_MQ_STOCK_DIFF_STR-EXCCODE sy-vline 
WA_/SCWM/S_MQ_STOCK_DIFF_STR-DOCCAT sy-vline 
WA_/SCWM/S_MQ_STOCK_DIFF_STR-DOCID sy-vline 
WA_/SCWM/S_MQ_STOCK_DIFF_STR-RDOCCAT sy-vline 
WA_/SCWM/S_MQ_STOCK_DIFF_STR-RDOCID sy-vline 
WA_/SCWM/S_MQ_STOCK_DIFF_STR-RITMID sy-vline 
WA_/SCWM/S_MQ_STOCK_DIFF_STR-QDOCCAT sy-vline 
WA_/SCWM/S_MQ_STOCK_DIFF_STR-QDOCID sy-vline 
WA_/SCWM/S_MQ_STOCK_DIFF_STR-QITMID sy-vline 
WA_/SCWM/S_MQ_STOCK_DIFF_STR-INSPTYP sy-vline 
WA_/SCWM/S_MQ_STOCK_DIFF_STR-INSPID sy-vline 
WA_/SCWM/S_MQ_STOCK_DIFF_STR-IDPLATE sy-vline 
WA_/SCWM/S_MQ_STOCK_DIFF_STR-CWQUAN sy-vline 
WA_/SCWM/S_MQ_STOCK_DIFF_STR-CWUNIT sy-vline 
WA_/SCWM/S_MQ_STOCK_DIFF_STR-CWEXACT sy-vline 
WA_/SCWM/S_MQ_STOCK_DIFF_STR-WDATU sy-vline 
WA_/SCWM/S_MQ_STOCK_DIFF_STR-VFDAT sy-vline 
WA_/SCWM/S_MQ_STOCK_DIFF_STR-COO sy-vline      INTO ld_text SEPARATED BY SPACE.

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