ABAP Select data from SAP table MDFQ into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM MDFQ
*  INTO TABLE @DATA(IT_MDFQ2).
*--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_MDFQ INDEX 1 INTO DATA(WA_MDFQ2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<MDFQ>-MANDT = 1.
<MDFQ>-MATNR = 1.
<MDFQ>-WERKS = 1.
<MDFQ>-VERID = 1.
<MDFQ>-BDATU = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_MDFQ-ADATU, sy-vline,
  WA_MDFQ-STLAL, sy-vline,
  WA_MDFQ-STLAN, sy-vline,
  WA_MDFQ-VERTO, sy-vline,
  WA_MDFQ-BSTMI, sy-vline,
  WA_MDFQ-BSTMA, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_MDFQ 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_MDFQ 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_MDFQ INTO WA_MDFQ.


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

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

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

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

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

*Conversion exit ALPHA, internal->external for field QUNUM
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_MDFQ-QUNUM
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MDFQ-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_MDFQ_STR, 
MANDT TYPE STRING,
MATNR TYPE STRING,
WERKS TYPE STRING,
VERID TYPE STRING,
BDATU TYPE STRING,
ADATU TYPE STRING,
STLAL TYPE STRING,
STLAN TYPE STRING,
VERTO TYPE STRING,
BSTMI TYPE STRING,
BSTMA TYPE STRING,
ALORT TYPE STRING,
ELPRO TYPE STRING,
PRVBE TYPE STRING,
MATKO TYPE STRING,
PLNNR TYPE STRING,
ALNAL TYPE STRING,
MKSP TYPE STRING,
QUNUM TYPE STRING,
QUPOS TYPE STRING,
QUOTE TYPE STRING,
PREIH TYPE STRING,
MAXMG TYPE STRING,
QUBMG TYPE STRING,
QUMNG TYPE STRING,
TEXT1 TYPE STRING,
VERSIND TYPE STRING,END OF T_EKKO_STR.
DATA: WA_MDFQ_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_MDFQ_STR-MANDT sy-vline 
WA_MDFQ_STR-MATNR sy-vline 
WA_MDFQ_STR-WERKS sy-vline 
WA_MDFQ_STR-VERID sy-vline 
WA_MDFQ_STR-BDATU sy-vline 
WA_MDFQ_STR-ADATU sy-vline 
WA_MDFQ_STR-STLAL sy-vline 
WA_MDFQ_STR-STLAN sy-vline 
WA_MDFQ_STR-VERTO sy-vline 
WA_MDFQ_STR-BSTMI sy-vline 
WA_MDFQ_STR-BSTMA sy-vline 
WA_MDFQ_STR-ALORT sy-vline 
WA_MDFQ_STR-ELPRO sy-vline 
WA_MDFQ_STR-PRVBE sy-vline 
WA_MDFQ_STR-MATKO sy-vline 
WA_MDFQ_STR-PLNNR sy-vline 
WA_MDFQ_STR-ALNAL sy-vline 
WA_MDFQ_STR-MKSP sy-vline 
WA_MDFQ_STR-QUNUM sy-vline 
WA_MDFQ_STR-QUPOS sy-vline 
WA_MDFQ_STR-QUOTE sy-vline 
WA_MDFQ_STR-PREIH sy-vline 
WA_MDFQ_STR-MAXMG sy-vline 
WA_MDFQ_STR-QUBMG sy-vline 
WA_MDFQ_STR-QUMNG sy-vline 
WA_MDFQ_STR-TEXT1 sy-vline 
WA_MDFQ_STR-VERSIND sy-vline      INTO ld_text SEPARATED BY SPACE.

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