ABAP Select data from SAP table MDITEMS into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM MDITEMS
*  INTO TABLE @DATA(IT_MDITEMS2).
*--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_MDITEMS INDEX 1 INTO DATA(WA_MDITEMS2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<MDITEMS>-ARTNR = 1.
<MDITEMS>-MAKTX = 1.
<MDITEMS>-VKORG = 1.
<MDITEMS>-VTWEG = 1.
<MDITEMS>-ATTYP = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_MDITEMS-MATKL, sy-vline,
  WA_MDITEMS-SATNR, sy-vline,
  WA_MDITEMS-PMATN, sy-vline,
  WA_MDITEMS-SAISO, sy-vline,
  WA_MDITEMS-SAISJ, sy-vline,
  WA_MDITEMS-DATAB, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_MDITEMS 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_MDITEMS 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_MDITEMS INTO WA_MDITEMS.


*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 ARTNR
CALL FUNCTION 'CONVERSION_EXIT_MATN1_OUTPUT'
  EXPORTING
    input =                      WA_MDITEMS-ARTNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MDITEMS-ARTNR.
WRITE:/ 'New Value:', ld_input.

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

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

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

*Conversion exit CUNIT, internal->external for field BBPRM
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_MDITEMS-BBPRM
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MDITEMS-BBPRM.
WRITE:/ 'New Value:', ld_input.

*Conversion exit CUNIT, internal->external for field VRKME
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_MDITEMS-VRKME
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MDITEMS-VRKME.
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_MDITEMS_STR, 
ARTNR TYPE STRING,
MAKTX TYPE STRING,
VKORG TYPE STRING,
VTWEG TYPE STRING,
ATTYP TYPE STRING,
MATKL TYPE STRING,
SATNR TYPE STRING,
PMATN TYPE STRING,
SAISO TYPE STRING,
SAISJ TYPE STRING,
DATAB TYPE STRING,
MPRNR TYPE STRING,
CUREP TYPE STRING,
EPEIN TYPE STRING,
BBPRM TYPE STRING,
EKPGR TYPE STRING,
EKWVK TYPE STRING,
CURVP TYPE STRING,
VRKME TYPE STRING,
ENDPR TYPE STRING,
VKPKZ TYPE STRING,
PANFM TYPE STRING,
PSALM TYPE STRING,
ERNAM TYPE STRING,
ERDAT TYPE STRING,
AENAM TYPE STRING,
AEDAT TYPE STRING,
UPDKZ TYPE STRING,
MESSAGE TYPE STRING,END OF T_EKKO_STR.
DATA: WA_MDITEMS_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_MDITEMS_STR-ARTNR sy-vline 
WA_MDITEMS_STR-MAKTX sy-vline 
WA_MDITEMS_STR-VKORG sy-vline 
WA_MDITEMS_STR-VTWEG sy-vline 
WA_MDITEMS_STR-ATTYP sy-vline 
WA_MDITEMS_STR-MATKL sy-vline 
WA_MDITEMS_STR-SATNR sy-vline 
WA_MDITEMS_STR-PMATN sy-vline 
WA_MDITEMS_STR-SAISO sy-vline 
WA_MDITEMS_STR-SAISJ sy-vline 
WA_MDITEMS_STR-DATAB sy-vline 
WA_MDITEMS_STR-MPRNR sy-vline 
WA_MDITEMS_STR-CUREP sy-vline 
WA_MDITEMS_STR-EPEIN sy-vline 
WA_MDITEMS_STR-BBPRM sy-vline 
WA_MDITEMS_STR-EKPGR sy-vline 
WA_MDITEMS_STR-EKWVK sy-vline 
WA_MDITEMS_STR-CURVP sy-vline 
WA_MDITEMS_STR-VRKME sy-vline 
WA_MDITEMS_STR-ENDPR sy-vline 
WA_MDITEMS_STR-VKPKZ sy-vline 
WA_MDITEMS_STR-PANFM sy-vline 
WA_MDITEMS_STR-PSALM sy-vline 
WA_MDITEMS_STR-ERNAM sy-vline 
WA_MDITEMS_STR-ERDAT sy-vline 
WA_MDITEMS_STR-AENAM sy-vline 
WA_MDITEMS_STR-AEDAT sy-vline 
WA_MDITEMS_STR-UPDKZ sy-vline 
WA_MDITEMS_STR-MESSAGE sy-vline      INTO ld_text SEPARATED BY SPACE.

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