ABAP Select data from SAP table MDZUSEL into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM MDZUSEL
*  INTO TABLE @DATA(IT_MDZUSEL2).
*--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_MDZUSEL INDEX 1 INTO DATA(WA_MDZUSEL2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<MDZUSEL>-DTDFV = 1.
<MDZUSEL>-DTDFB = 1.
<MDZUSEL>-DTDBV = 1.
<MDZUSEL>-DTDBB = 1.
<MDZUSEL>-BERW1 = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_MDZUSEL-BERW2, sy-vline,
  WA_MDZUSEL-BERW4, sy-vline,
  WA_MDZUSEL-MAABC, sy-vline,
  WA_MDZUSEL-DISMM, sy-vline,
  WA_MDZUSEL-BESKZ, sy-vline,
  WA_MDZUSEL-SOBSL, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_MDZUSEL 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_MDZUSEL 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_MDZUSEL INTO WA_MDZUSEL.


*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_MDZUSEL_STR, 
DTDFV TYPE STRING,
DTDFB TYPE STRING,
DTDBV TYPE STRING,
DTDBB TYPE STRING,
BERW1 TYPE STRING,
BERW2 TYPE STRING,
BERW4 TYPE STRING,
MAABC TYPE STRING,
DISMM TYPE STRING,
BESKZ TYPE STRING,
SOBSL TYPE STRING,
SELKZ1 TYPE STRING,
SELKZ2 TYPE STRING,
SELKZ3 TYPE STRING,
SELKZ4 TYPE STRING,
SELKZ5 TYPE STRING,
SELKZ6 TYPE STRING,
SELKZ7 TYPE STRING,
SELKZ8 TYPE STRING,
JBEKZ TYPE STRING,
NBEKZ TYPE STRING,
NAUKZ TYPE STRING,END OF T_EKKO_STR.
DATA: WA_MDZUSEL_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_MDZUSEL_STR-DTDFV sy-vline 
WA_MDZUSEL_STR-DTDFB sy-vline 
WA_MDZUSEL_STR-DTDBV sy-vline 
WA_MDZUSEL_STR-DTDBB sy-vline 
WA_MDZUSEL_STR-BERW1 sy-vline 
WA_MDZUSEL_STR-BERW2 sy-vline 
WA_MDZUSEL_STR-BERW4 sy-vline 
WA_MDZUSEL_STR-MAABC sy-vline 
WA_MDZUSEL_STR-DISMM sy-vline 
WA_MDZUSEL_STR-BESKZ sy-vline 
WA_MDZUSEL_STR-SOBSL sy-vline 
WA_MDZUSEL_STR-SELKZ1 sy-vline 
WA_MDZUSEL_STR-SELKZ2 sy-vline 
WA_MDZUSEL_STR-SELKZ3 sy-vline 
WA_MDZUSEL_STR-SELKZ4 sy-vline 
WA_MDZUSEL_STR-SELKZ5 sy-vline 
WA_MDZUSEL_STR-SELKZ6 sy-vline 
WA_MDZUSEL_STR-SELKZ7 sy-vline 
WA_MDZUSEL_STR-SELKZ8 sy-vline 
WA_MDZUSEL_STR-JBEKZ sy-vline 
WA_MDZUSEL_STR-NBEKZ sy-vline 
WA_MDZUSEL_STR-NAUKZ sy-vline      INTO ld_text SEPARATED BY SPACE.

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