ABAP Select data from SAP table MARDU into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM MARDU
*  INTO TABLE @DATA(IT_MARDU2).
*--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_MARDU INDEX 1 INTO DATA(WA_MARDU2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<MARDU>-MANDT = 1.
<MARDU>-MATNR = 1.
<MARDU>-WERKS = 1.
<MARDU>-LGORT = 1.
<MARDU>-PSTAT = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_MARDU-LVORM, sy-vline,
  WA_MARDU-DISKZ, sy-vline,
  WA_MARDU-LSOBS, sy-vline,
  WA_MARDU-LMINB, sy-vline,
  WA_MARDU-LBSTF, sy-vline,
  WA_MARDU-HERKL, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_MARDU 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_MARDU 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_MARDU INTO WA_MARDU.


*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_MARDU-MATNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MARDU-MATNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field PRCTL
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_MARDU-PRCTL
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MARDU-PRCTL.
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_MARDU_STR, 
MANDT TYPE STRING,
MATNR TYPE STRING,
WERKS TYPE STRING,
LGORT TYPE STRING,
PSTAT TYPE STRING,
LVORM TYPE STRING,
DISKZ TYPE STRING,
LSOBS TYPE STRING,
LMINB TYPE STRING,
LBSTF TYPE STRING,
HERKL TYPE STRING,
EXPPG TYPE STRING,
EXVER TYPE STRING,
LGPBE TYPE STRING,
PRCTL TYPE STRING,
LWMKB TYPE STRING,
DUMMY_STL_INCL_EEW_PS TYPE STRING,
FSH_SALLOC_QTY_S TYPE STRING,END OF T_EKKO_STR.
DATA: WA_MARDU_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_MARDU_STR-MANDT sy-vline 
WA_MARDU_STR-MATNR sy-vline 
WA_MARDU_STR-WERKS sy-vline 
WA_MARDU_STR-LGORT sy-vline 
WA_MARDU_STR-PSTAT sy-vline 
WA_MARDU_STR-LVORM sy-vline 
WA_MARDU_STR-DISKZ sy-vline 
WA_MARDU_STR-LSOBS sy-vline 
WA_MARDU_STR-LMINB sy-vline 
WA_MARDU_STR-LBSTF sy-vline 
WA_MARDU_STR-HERKL sy-vline 
WA_MARDU_STR-EXPPG sy-vline 
WA_MARDU_STR-EXVER sy-vline 
WA_MARDU_STR-LGPBE sy-vline 
WA_MARDU_STR-PRCTL sy-vline 
WA_MARDU_STR-LWMKB sy-vline 
WA_MARDU_STR-DUMMY_STL_INCL_EEW_PS sy-vline 
WA_MARDU_STR-FSH_SALLOC_QTY_S sy-vline      INTO ld_text SEPARATED BY SPACE.

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