ABAP Select data from SAP table DUVMSEG_EXTRACT into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM DUVMSEG_EXTRACT
*  INTO TABLE @DATA(IT_DUVMSEG_EXTRACT2).
*--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_DUVMSEG_EXTRACT INDEX 1 INTO DATA(WA_DUVMSEG_EXTRACT2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<DUVMSEG_EXTRACT>-MANDT = 1.
<DUVMSEG_EXTRACT>-MBLNR = 1.
<DUVMSEG_EXTRACT>-MJAHR = 1.
<DUVMSEG_EXTRACT>-ZEILE = 1.
<DUVMSEG_EXTRACT>-BUDAT = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_DUVMSEG_EXTRACT-BWART, sy-vline,
  WA_DUVMSEG_EXTRACT-MATNR, sy-vline,
  WA_DUVMSEG_EXTRACT-WERKS, sy-vline,
  WA_DUVMSEG_EXTRACT-LGORT, sy-vline,
  WA_DUVMSEG_EXTRACT-CHARG, sy-vline,
  WA_DUVMSEG_EXTRACT-BWTAR, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_DUVMSEG_EXTRACT 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_DUVMSEG_EXTRACT 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_DUVMSEG_EXTRACT INTO WA_DUVMSEG_EXTRACT.


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

*Conversion exit GJAHR, internal->external for field MJAHR
CALL FUNCTION 'CONVERSION_EXIT_GJAHR_OUTPUT'
  EXPORTING
    input =                      WA_DUVMSEG_EXTRACT-MJAHR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_DUVMSEG_EXTRACT-MJAHR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit MATN1, internal->external for field MATNR
CALL FUNCTION 'CONVERSION_EXIT_MATN1_OUTPUT'
  EXPORTING
    input =                      WA_DUVMSEG_EXTRACT-MATNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_DUVMSEG_EXTRACT-MATNR.
WRITE:/ 'New Value:', ld_input.

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

*Conversion exit CUNIT, internal->external for field MEINS
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_DUVMSEG_EXTRACT-MEINS
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_DUVMSEG_EXTRACT-MEINS.
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_DUVMSEG_EXTRACT_STR, 
MANDT TYPE STRING,
MBLNR TYPE STRING,
MJAHR TYPE STRING,
ZEILE TYPE STRING,
BUDAT TYPE STRING,
BWART TYPE STRING,
MATNR TYPE STRING,
WERKS TYPE STRING,
LGORT TYPE STRING,
CHARG TYPE STRING,
BWTAR TYPE STRING,
INSMK TYPE STRING,
AUFNR TYPE STRING,
MENGE TYPE STRING,
MEINS TYPE STRING,
SHKZG TYPE STRING,
AUFPS TYPE STRING,
AUFPL TYPE STRING,
APLZL TYPE STRING,END OF T_EKKO_STR.
DATA: WA_DUVMSEG_EXTRACT_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_DUVMSEG_EXTRACT_STR-MANDT sy-vline 
WA_DUVMSEG_EXTRACT_STR-MBLNR sy-vline 
WA_DUVMSEG_EXTRACT_STR-MJAHR sy-vline 
WA_DUVMSEG_EXTRACT_STR-ZEILE sy-vline 
WA_DUVMSEG_EXTRACT_STR-BUDAT sy-vline 
WA_DUVMSEG_EXTRACT_STR-BWART sy-vline 
WA_DUVMSEG_EXTRACT_STR-MATNR sy-vline 
WA_DUVMSEG_EXTRACT_STR-WERKS sy-vline 
WA_DUVMSEG_EXTRACT_STR-LGORT sy-vline 
WA_DUVMSEG_EXTRACT_STR-CHARG sy-vline 
WA_DUVMSEG_EXTRACT_STR-BWTAR sy-vline 
WA_DUVMSEG_EXTRACT_STR-INSMK sy-vline 
WA_DUVMSEG_EXTRACT_STR-AUFNR sy-vline 
WA_DUVMSEG_EXTRACT_STR-MENGE sy-vline 
WA_DUVMSEG_EXTRACT_STR-MEINS sy-vline 
WA_DUVMSEG_EXTRACT_STR-SHKZG sy-vline 
WA_DUVMSEG_EXTRACT_STR-AUFPS sy-vline 
WA_DUVMSEG_EXTRACT_STR-AUFPL sy-vline 
WA_DUVMSEG_EXTRACT_STR-APLZL sy-vline      INTO ld_text SEPARATED BY SPACE.

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