ABAP Select data from SAP table MDSU into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM MDSU
*  INTO TABLE @DATA(IT_MDSU2).
*--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_MDSU INDEX 1 INTO DATA(WA_MDSU2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<MDSU>-PLAAB = 1.
<MDSU>-PLANR = 1.
<MDSU>-SORT0 = 1.
<MDSU>-DELKZ = 1.
<MDSU>-DAT00 = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_MDSU-PERKZ, sy-vline,
  WA_MDSU-PRPER, sy-vline,
  WA_MDSU-ANZFD, sy-vline,
  WA_MDSU-EXTSU, sy-vline,
  WA_MDSU-MNG01, sy-vline,
  WA_MDSU-MNG02, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_MDSU 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_MDSU 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_MDSU INTO WA_MDSU.


*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_MDSU_STR, 
PLAAB TYPE STRING,
PLANR TYPE STRING,
SORT0 TYPE STRING,
DELKZ TYPE STRING,
DAT00 TYPE STRING,
PERKZ TYPE STRING,
PRPER TYPE STRING,
ANZFD TYPE STRING,
EXTSU TYPE STRING,
MNG01 TYPE STRING,
MNG02 TYPE STRING,
MNG03 TYPE STRING,
MNG04 TYPE STRING,
MNG05 TYPE STRING,
MNG06 TYPE STRING,
MNG07 TYPE STRING,
ISTRW TYPE STRING,
SLRWX TYPE STRING,
MIRWX TYPE STRING,
MARWX TYPE STRING,
SLBES TYPE STRING,
MDBES TYPE STRING,
MXBES TYPE STRING,
TGBED TYPE STRING,
TGPRO TYPE STRING,
BERW1 TYPE STRING,
BERW2 TYPE STRING,
SSTOCK TYPE STRING,
ANZBV TYPE STRING,
AZZUG TYPE STRING,
ALINE TYPE STRING,
ELINE TYPE STRING,
FBYTE TYPE STRING,
AKZ01 TYPE STRING,
AKZ02 TYPE STRING,
AKZ03 TYPE STRING,
AKZ04 TYPE STRING,
USEX1 TYPE STRING,
USEX2 TYPE STRING,
USEX3 TYPE STRING,
DETAIL_ICON TYPE STRING,END OF T_EKKO_STR.
DATA: WA_MDSU_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_MDSU_STR-PLAAB sy-vline 
WA_MDSU_STR-PLANR sy-vline 
WA_MDSU_STR-SORT0 sy-vline 
WA_MDSU_STR-DELKZ sy-vline 
WA_MDSU_STR-DAT00 sy-vline 
WA_MDSU_STR-PERKZ sy-vline 
WA_MDSU_STR-PRPER sy-vline 
WA_MDSU_STR-ANZFD sy-vline 
WA_MDSU_STR-EXTSU sy-vline 
WA_MDSU_STR-MNG01 sy-vline 
WA_MDSU_STR-MNG02 sy-vline 
WA_MDSU_STR-MNG03 sy-vline 
WA_MDSU_STR-MNG04 sy-vline 
WA_MDSU_STR-MNG05 sy-vline 
WA_MDSU_STR-MNG06 sy-vline 
WA_MDSU_STR-MNG07 sy-vline 
WA_MDSU_STR-ISTRW sy-vline 
WA_MDSU_STR-SLRWX sy-vline 
WA_MDSU_STR-MIRWX sy-vline 
WA_MDSU_STR-MARWX sy-vline 
WA_MDSU_STR-SLBES sy-vline 
WA_MDSU_STR-MDBES sy-vline 
WA_MDSU_STR-MXBES sy-vline 
WA_MDSU_STR-TGBED sy-vline 
WA_MDSU_STR-TGPRO sy-vline 
WA_MDSU_STR-BERW1 sy-vline 
WA_MDSU_STR-BERW2 sy-vline 
WA_MDSU_STR-SSTOCK sy-vline 
WA_MDSU_STR-ANZBV sy-vline 
WA_MDSU_STR-AZZUG sy-vline 
WA_MDSU_STR-ALINE sy-vline 
WA_MDSU_STR-ELINE sy-vline 
WA_MDSU_STR-FBYTE sy-vline 
WA_MDSU_STR-AKZ01 sy-vline 
WA_MDSU_STR-AKZ02 sy-vline 
WA_MDSU_STR-AKZ03 sy-vline 
WA_MDSU_STR-AKZ04 sy-vline 
WA_MDSU_STR-USEX1 sy-vline 
WA_MDSU_STR-USEX2 sy-vline 
WA_MDSU_STR-USEX3 sy-vline 
WA_MDSU_STR-DETAIL_ICON sy-vline      INTO ld_text SEPARATED BY SPACE.

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