ABAP Select data from SAP table MDBFDK 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 MDBFDK 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 MDBFDK. 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 MDBFDK 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_MDBFDK TYPE STANDARD TABLE OF MDBFDK,
      WA_MDBFDK TYPE MDBFDK,
      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: <MDBFDK> TYPE MDBFDK.

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM MDBFDK
*  INTO TABLE @DATA(IT_MDBFDK2).
*--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_MDBFDK INDEX 1 INTO DATA(WA_MDBFDK2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<MDBFDK>-MATNR = 1.
<MDBFDK>-MAKTX = 1.
<MDBFDK>-WERKS = 1.
<MDBFDK>-CHARG = 1.
<MDBFDK>-NAME1 = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_MDBFDK-BDMNG, sy-vline,
  WA_MDBFDK-BDTER, sy-vline,
  WA_MDBFDK-MEINH, sy-vline,
  WA_MDBFDK-MEINH2, sy-vline,
  WA_MDBFDK-OFMNG, sy-vline,
  WA_MDBFDK-VRFMG, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_MDBFDK 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_MDBFDK 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_MDBFDK INTO WA_MDBFDK.


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

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

*Conversion exit CUNIT, internal->external for field MEINH2
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_MDBFDK-MEINH2
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MDBFDK-MEINH2.
WRITE:/ 'New Value:', ld_input.

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

*Conversion exit ALPHA, internal->external for field VBELN
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_MDBFDK-VBELN
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MDBFDK-VBELN.
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_MDBFDK_STR, 
MATNR TYPE STRING,
MAKTX TYPE STRING,
WERKS TYPE STRING,
CHARG TYPE STRING,
NAME1 TYPE STRING,
BDMNG TYPE STRING,
BDTER TYPE STRING,
MEINH TYPE STRING,
MEINH2 TYPE STRING,
OFMNG TYPE STRING,
VRFMG TYPE STRING,
SPMNG TYPE STRING,
RTEXT TYPE STRING,
STEXT TYPE STRING,
SOBKZ TYPE STRING,
SOTXT TYPE STRING,
LIFNR TYPE STRING,
VBELN TYPE STRING,
POSNR TYPE STRING,
BWTAR TYPE STRING,END OF T_EKKO_STR.
DATA: WA_MDBFDK_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_MDBFDK_STR-MATNR sy-vline 
WA_MDBFDK_STR-MAKTX sy-vline 
WA_MDBFDK_STR-WERKS sy-vline 
WA_MDBFDK_STR-CHARG sy-vline 
WA_MDBFDK_STR-NAME1 sy-vline 
WA_MDBFDK_STR-BDMNG sy-vline 
WA_MDBFDK_STR-BDTER sy-vline 
WA_MDBFDK_STR-MEINH sy-vline 
WA_MDBFDK_STR-MEINH2 sy-vline 
WA_MDBFDK_STR-OFMNG sy-vline 
WA_MDBFDK_STR-VRFMG sy-vline 
WA_MDBFDK_STR-SPMNG sy-vline 
WA_MDBFDK_STR-RTEXT sy-vline 
WA_MDBFDK_STR-STEXT sy-vline 
WA_MDBFDK_STR-SOBKZ sy-vline 
WA_MDBFDK_STR-SOTXT sy-vline 
WA_MDBFDK_STR-LIFNR sy-vline 
WA_MDBFDK_STR-VBELN sy-vline 
WA_MDBFDK_STR-POSNR sy-vline 
WA_MDBFDK_STR-BWTAR sy-vline      INTO ld_text SEPARATED BY SPACE.

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