ABAP Select data from SAP table MDFP into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM MDFP
*  INTO TABLE @DATA(IT_MDFP2).
*--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_MDFP INDEX 1 INTO DATA(WA_MDFP2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<MDFP>-DAT00 = 1.
<MDFP>-DELKZ = 1.
<MDFP>-MNG01 = 1.
<MDFP>-MNG02 = 1.
<MDFP>-MNG03 = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_MDFP-DAT01, sy-vline,
  WA_MDFP-DAT02, sy-vline,
  WA_MDFP-DAT03, sy-vline,
  WA_MDFP-FIX01, sy-vline,
  WA_MDFP-FIX02, sy-vline,
  WA_MDFP-SERNR, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_MDFP 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_MDFP 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_MDFP INTO WA_MDFP.


*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 ALPHA, internal->external for field AENNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_MDFP-AENNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MDFP-AENNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field STALT
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_MDFP-STALT
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MDFP-STALT.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field QUNUM
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_MDFP-QUNUM
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MDFP-QUNUM.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field AUFNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_MDFP-AUFNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MDFP-AUFNR.
WRITE:/ 'New Value:', ld_input.

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

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

*Conversion exit ALPHA, internal->external for field PLNUM
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_MDFP-PLNUM
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MDFP-PLNUM.
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_MDFP_STR, 
DAT00 TYPE STRING,
DELKZ TYPE STRING,
MNG01 TYPE STRING,
MNG02 TYPE STRING,
MNG03 TYPE STRING,
DAT01 TYPE STRING,
DAT02 TYPE STRING,
DAT03 TYPE STRING,
FIX01 TYPE STRING,
FIX02 TYPE STRING,
SERNR TYPE STRING,
AENNR TYPE STRING,
STLAN TYPE STRING,
STALT TYPE STRING,
AUFVR TYPE STRING,
POSVR TYPE STRING,
EINVR TYPE STRING,
QUNUM TYPE STRING,
QUPOS TYPE STRING,
AUFNR TYPE STRING,
GMEIN TYPE STRING,
MATNR TYPE STRING,
VERID TYPE STRING,
PLNUM TYPE STRING,
MDV01 TYPE STRING,
MDV02 TYPE STRING,
AEFLG TYPE STRING,END OF T_EKKO_STR.
DATA: WA_MDFP_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_MDFP_STR-DAT00 sy-vline 
WA_MDFP_STR-DELKZ sy-vline 
WA_MDFP_STR-MNG01 sy-vline 
WA_MDFP_STR-MNG02 sy-vline 
WA_MDFP_STR-MNG03 sy-vline 
WA_MDFP_STR-DAT01 sy-vline 
WA_MDFP_STR-DAT02 sy-vline 
WA_MDFP_STR-DAT03 sy-vline 
WA_MDFP_STR-FIX01 sy-vline 
WA_MDFP_STR-FIX02 sy-vline 
WA_MDFP_STR-SERNR sy-vline 
WA_MDFP_STR-AENNR sy-vline 
WA_MDFP_STR-STLAN sy-vline 
WA_MDFP_STR-STALT sy-vline 
WA_MDFP_STR-AUFVR sy-vline 
WA_MDFP_STR-POSVR sy-vline 
WA_MDFP_STR-EINVR sy-vline 
WA_MDFP_STR-QUNUM sy-vline 
WA_MDFP_STR-QUPOS sy-vline 
WA_MDFP_STR-AUFNR sy-vline 
WA_MDFP_STR-GMEIN sy-vline 
WA_MDFP_STR-MATNR sy-vline 
WA_MDFP_STR-VERID sy-vline 
WA_MDFP_STR-PLNUM sy-vline 
WA_MDFP_STR-MDV01 sy-vline 
WA_MDFP_STR-MDV02 sy-vline 
WA_MDFP_STR-AEFLG sy-vline      INTO ld_text SEPARATED BY SPACE.

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