ABAP Select data from SAP table MDFA into internal table

Get Example source ABAP code based on a different SAP table
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Below is a number of ABAP code snippets to demonstrate how to select data from SAP MDFA 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 MDFA. 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 MDFA 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_MDFA TYPE STANDARD TABLE OF MDFA,
      WA_MDFA TYPE MDFA,
      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: <MDFA> TYPE MDFA.

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM MDFA
*  INTO TABLE @DATA(IT_MDFA2).
*--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_MDFA INDEX 1 INTO DATA(WA_MDFA2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<MDFA>-MANDT = 1.
<MDFA>-AUFNR = 1.
<MDFA>-POSNR = 1.
<MDFA>-AFTYP = 1.
<MDFA>-AFART = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_MDFA-ELIKZ, sy-vline,
  WA_MDFA-STATF, sy-vline,
  WA_MDFA-DNREL, sy-vline,
  WA_MDFA-MATNR, sy-vline,
  WA_MDFA-PLWRK, sy-vline,
  WA_MDFA-LGORT, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_MDFA 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_MDFA 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_MDFA INTO WA_MDFA.


*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 AUFNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_MDFA-AUFNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MDFA-AUFNR.
WRITE:/ 'New Value:', ld_input.

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

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

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

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

*Conversion exit ABPSP, internal->external for field PSPEL
CALL FUNCTION 'CONVERSION_EXIT_ABPSP_OUTPUT'
  EXPORTING
    input =                      WA_MDFA-PSPEL
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MDFA-PSPEL.
WRITE:/ 'New Value:', ld_input.

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

*Conversion exit ALPHA, internal->external for field QUNUM
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_MDFA-QUNUM
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MDFA-QUNUM.
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_MDFA_STR, 
MANDT TYPE STRING,
AUFNR TYPE STRING,
POSNR TYPE STRING,
AFTYP TYPE STRING,
AFART TYPE STRING,
ELIKZ TYPE STRING,
STATF TYPE STRING,
DNREL TYPE STRING,
MATNR TYPE STRING,
PLWRK TYPE STRING,
LGORT TYPE STRING,
PWWRK TYPE STRING,
BESKZ TYPE STRING,
SOBES TYPE STRING,
GSMNG TYPE STRING,
WEMNG TYPE STRING,
PAMNG TYPE STRING,
IAMNG TYPE STRING,
AMEIN TYPE STRING,
MEINS TYPE STRING,
UMREZ TYPE STRING,
UMREN TYPE STRING,
PEDTR TYPE STRING,
SEDTR TYPE STRING,
WEBAZ TYPE STRING,
SERNR TYPE STRING,
CUOBJ TYPE STRING,
KNTTP TYPE STRING,
SOBKZ TYPE STRING,
KZVBR TYPE STRING,
KDAUF TYPE STRING,
KDPOS TYPE STRING,
KDEIN TYPE STRING,
PSPEL TYPE STRING,
WEPOS TYPE STRING,
SAFNR TYPE STRING,
VERID TYPE STRING,
VERTO TYPE STRING,
QUNUM TYPE STRING,
QUPOS TYPE STRING,
ARSNR TYPE STRING,
ARSPS TYPE STRING,
NDISR TYPE STRING,
VFMNG TYPE STRING,
GSBTR TYPE STRING,
CHARG TYPE STRING,
BWTAR TYPE STRING,
UNTTO TYPE STRING,
TECHS TYPE STRING,
BERID TYPE STRING,
KRSNR TYPE STRING,
KRSPS TYPE STRING,
INSMK TYPE STRING,
SGT_SCAT TYPE STRING,END OF T_EKKO_STR.
DATA: WA_MDFA_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_MDFA_STR-MANDT sy-vline 
WA_MDFA_STR-AUFNR sy-vline 
WA_MDFA_STR-POSNR sy-vline 
WA_MDFA_STR-AFTYP sy-vline 
WA_MDFA_STR-AFART sy-vline 
WA_MDFA_STR-ELIKZ sy-vline 
WA_MDFA_STR-STATF sy-vline 
WA_MDFA_STR-DNREL sy-vline 
WA_MDFA_STR-MATNR sy-vline 
WA_MDFA_STR-PLWRK sy-vline 
WA_MDFA_STR-LGORT sy-vline 
WA_MDFA_STR-PWWRK sy-vline 
WA_MDFA_STR-BESKZ sy-vline 
WA_MDFA_STR-SOBES sy-vline 
WA_MDFA_STR-GSMNG sy-vline 
WA_MDFA_STR-WEMNG sy-vline 
WA_MDFA_STR-PAMNG sy-vline 
WA_MDFA_STR-IAMNG sy-vline 
WA_MDFA_STR-AMEIN sy-vline 
WA_MDFA_STR-MEINS sy-vline 
WA_MDFA_STR-UMREZ sy-vline 
WA_MDFA_STR-UMREN sy-vline 
WA_MDFA_STR-PEDTR sy-vline 
WA_MDFA_STR-SEDTR sy-vline 
WA_MDFA_STR-WEBAZ sy-vline 
WA_MDFA_STR-SERNR sy-vline 
WA_MDFA_STR-CUOBJ sy-vline 
WA_MDFA_STR-KNTTP sy-vline 
WA_MDFA_STR-SOBKZ sy-vline 
WA_MDFA_STR-KZVBR sy-vline 
WA_MDFA_STR-KDAUF sy-vline 
WA_MDFA_STR-KDPOS sy-vline 
WA_MDFA_STR-KDEIN sy-vline 
WA_MDFA_STR-PSPEL sy-vline 
WA_MDFA_STR-WEPOS sy-vline 
WA_MDFA_STR-SAFNR sy-vline 
WA_MDFA_STR-VERID sy-vline 
WA_MDFA_STR-VERTO sy-vline 
WA_MDFA_STR-QUNUM sy-vline 
WA_MDFA_STR-QUPOS sy-vline 
WA_MDFA_STR-ARSNR sy-vline 
WA_MDFA_STR-ARSPS sy-vline 
WA_MDFA_STR-NDISR sy-vline 
WA_MDFA_STR-VFMNG sy-vline 
WA_MDFA_STR-GSBTR sy-vline 
WA_MDFA_STR-CHARG sy-vline 
WA_MDFA_STR-BWTAR sy-vline 
WA_MDFA_STR-UNTTO sy-vline 
WA_MDFA_STR-TECHS sy-vline 
WA_MDFA_STR-BERID sy-vline 
WA_MDFA_STR-KRSNR sy-vline 
WA_MDFA_STR-KRSPS sy-vline 
WA_MDFA_STR-INSMK sy-vline 
WA_MDFA_STR-SGT_SCAT sy-vline      INTO ld_text SEPARATED BY SPACE.

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