ABAP Select data from SAP table MDSU_DB into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP MDSU_DB 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_DB. 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_DB 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_DB TYPE STANDARD TABLE OF MDSU_DB,
      WA_MDSU_DB TYPE MDSU_DB,
      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_DB> TYPE MDSU_DB.

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM MDSU_DB
*  INTO TABLE @DATA(IT_MDSU_DB2).
*--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_DB INDEX 1 INTO DATA(WA_MDSU_DB2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<MDSU_DB>-MANDT = 1.
<MDSU_DB>-MATNR = 1.
<MDSU_DB>-PLANT = 1.
<MDSU_DB>-LINE = 1.
<MDSU_DB>-PLAAB = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_MDSU_DB-PLANR, sy-vline,
  WA_MDSU_DB-SORT0, sy-vline,
  WA_MDSU_DB-DELKZ, sy-vline,
  WA_MDSU_DB-DAT00, sy-vline,
  WA_MDSU_DB-PERKZ, sy-vline,
  WA_MDSU_DB-PRPER, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_MDSU_DB 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_DB 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_DB INTO WA_MDSU_DB.


*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 MATN1, internal->external for field MATNR
CALL FUNCTION 'CONVERSION_EXIT_MATN1_OUTPUT'
  EXPORTING
    input =                      WA_MDSU_DB-MATNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MDSU_DB-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_MDSU_DB_STR, 
MANDT TYPE STRING,
MATNR TYPE STRING,
PLANT TYPE STRING,
LINE TYPE STRING,
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,
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_DB_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_DB_STR-MANDT sy-vline 
WA_MDSU_DB_STR-MATNR sy-vline 
WA_MDSU_DB_STR-PLANT sy-vline 
WA_MDSU_DB_STR-LINE sy-vline 
WA_MDSU_DB_STR-PLAAB sy-vline 
WA_MDSU_DB_STR-PLANR sy-vline 
WA_MDSU_DB_STR-SORT0 sy-vline 
WA_MDSU_DB_STR-DELKZ sy-vline 
WA_MDSU_DB_STR-DAT00 sy-vline 
WA_MDSU_DB_STR-PERKZ sy-vline 
WA_MDSU_DB_STR-PRPER sy-vline 
WA_MDSU_DB_STR-ANZFD sy-vline 
WA_MDSU_DB_STR-EXTSU sy-vline 
WA_MDSU_DB_STR-MNG01 sy-vline 
WA_MDSU_DB_STR-MNG02 sy-vline 
WA_MDSU_DB_STR-MNG03 sy-vline 
WA_MDSU_DB_STR-MNG04 sy-vline 
WA_MDSU_DB_STR-MNG05 sy-vline 
WA_MDSU_DB_STR-MNG06 sy-vline 
WA_MDSU_DB_STR-MNG07 sy-vline 
WA_MDSU_DB_STR-ISTRW sy-vline 
WA_MDSU_DB_STR-SLRWX sy-vline 
WA_MDSU_DB_STR-MIRWX sy-vline 
WA_MDSU_DB_STR-MARWX sy-vline 
WA_MDSU_DB_STR-SLBES sy-vline 
WA_MDSU_DB_STR-MDBES sy-vline 
WA_MDSU_DB_STR-MXBES sy-vline 
WA_MDSU_DB_STR-TGBED sy-vline 
WA_MDSU_DB_STR-TGPRO sy-vline 
WA_MDSU_DB_STR-BERW1 sy-vline 
WA_MDSU_DB_STR-BERW2 sy-vline 
WA_MDSU_DB_STR-ANZBV sy-vline 
WA_MDSU_DB_STR-AZZUG sy-vline 
WA_MDSU_DB_STR-ALINE sy-vline 
WA_MDSU_DB_STR-ELINE sy-vline 
WA_MDSU_DB_STR-FBYTE sy-vline 
WA_MDSU_DB_STR-AKZ01 sy-vline 
WA_MDSU_DB_STR-AKZ02 sy-vline 
WA_MDSU_DB_STR-AKZ03 sy-vline 
WA_MDSU_DB_STR-AKZ04 sy-vline 
WA_MDSU_DB_STR-USEX1 sy-vline 
WA_MDSU_DB_STR-USEX2 sy-vline 
WA_MDSU_DB_STR-USEX3 sy-vline 
WA_MDSU_DB_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.