ABAP Select data from SAP table MDBFDP into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM MDBFDP
*  INTO TABLE @DATA(IT_MDBFDP2).
*--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_MDBFDP INDEX 1 INTO DATA(WA_MDBFDP2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<MDBFDP>-LGORT = 1.
<MDBFDP>-CHARG = 1.
<MDBFDP>-BWTAR = 1.
<MDBFDP>-SOBKZ = 1.
<MDBFDP>-LIFNR = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_MDBFDP-MENGE_P, sy-vline,
  WA_MDBFDP-MENGE_POLD, sy-vline,
  WA_MDBFDP-VRFMG_P, sy-vline,
  WA_MDBFDP-ERFME, sy-vline,
  WA_MDBFDP-MENGE_OLD, sy-vline,
  WA_MDBFDP-TABIX, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_MDBFDP 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_MDBFDP 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_MDBFDP INTO WA_MDBFDP.


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

*Conversion exit CUNIT, internal->external for field ERFME
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_MDBFDP-ERFME
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MDBFDP-ERFME.
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_MDBFDP_STR, 
LGORT TYPE STRING,
CHARG TYPE STRING,
BWTAR TYPE STRING,
SOBKZ TYPE STRING,
LIFNR TYPE STRING,
MENGE_P TYPE STRING,
MENGE_POLD TYPE STRING,
VRFMG_P TYPE STRING,
ERFME TYPE STRING,
MENGE_OLD TYPE STRING,
TABIX TYPE STRING,
XMARK TYPE STRING,
XSELE TYPE STRING,
XREAD TYPE STRING,
XKEEP TYPE STRING,
XCORR TYPE STRING,
XDELE TYPE STRING,
CLICON TYPE STRING,
BDSRT TYPE STRING,
XCLAS TYPE STRING,END OF T_EKKO_STR.
DATA: WA_MDBFDP_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_MDBFDP_STR-LGORT sy-vline 
WA_MDBFDP_STR-CHARG sy-vline 
WA_MDBFDP_STR-BWTAR sy-vline 
WA_MDBFDP_STR-SOBKZ sy-vline 
WA_MDBFDP_STR-LIFNR sy-vline 
WA_MDBFDP_STR-MENGE_P sy-vline 
WA_MDBFDP_STR-MENGE_POLD sy-vline 
WA_MDBFDP_STR-VRFMG_P sy-vline 
WA_MDBFDP_STR-ERFME sy-vline 
WA_MDBFDP_STR-MENGE_OLD sy-vline 
WA_MDBFDP_STR-TABIX sy-vline 
WA_MDBFDP_STR-XMARK sy-vline 
WA_MDBFDP_STR-XSELE sy-vline 
WA_MDBFDP_STR-XREAD sy-vline 
WA_MDBFDP_STR-XKEEP sy-vline 
WA_MDBFDP_STR-XCORR sy-vline 
WA_MDBFDP_STR-XDELE sy-vline 
WA_MDBFDP_STR-CLICON sy-vline 
WA_MDBFDP_STR-BDSRT sy-vline 
WA_MDBFDP_STR-XCLAS sy-vline      INTO ld_text SEPARATED BY SPACE.

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