ABAP Select data from SAP table MDNB into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM MDNB
*  INTO TABLE @DATA(IT_MDNB2).
*--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_MDNB INDEX 1 INTO DATA(WA_MDNB2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<MDNB>-PLAAB = 1.
<MDNB>-PLANR = 1.
<MDNB>-DAT00 = 1.
<MDNB>-MNG01 = 1.
<MDNB>-MNG03 = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_MDNB-SERNR, sy-vline,
  WA_MDNB-VERID, sy-vline,
  WA_MDNB-CUOBJ, sy-vline,
  WA_MDNB-KNTTP, sy-vline,
  WA_MDNB-SOBKZ, sy-vline,
  WA_MDNB-KZVBR, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_MDNB 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_MDNB 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_MDNB INTO WA_MDNB.


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

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

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

*Conversion exit NUMCV, internal->external for field STLNR
CALL FUNCTION 'CONVERSION_EXIT_NUMCV_OUTPUT'
  EXPORTING
    input =                      WA_MDNB-STLNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MDNB-STLNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field KUNNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_MDNB-KUNNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MDNB-KUNNR.
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_MDNB_STR, 
PLAAB TYPE STRING,
PLANR TYPE STRING,
DAT00 TYPE STRING,
MNG01 TYPE STRING,
MNG03 TYPE STRING,
SERNR TYPE STRING,
VERID TYPE STRING,
CUOBJ TYPE STRING,
KNTTP TYPE STRING,
SOBKZ TYPE STRING,
KZVBR TYPE STRING,
KZBWS TYPE STRING,
KDAUF TYPE STRING,
KDPOS TYPE STRING,
PSPEL TYPE STRING,
ARSNR TYPE STRING,
ARSPS TYPE STRING,
MONKZ TYPE STRING,
VRPLA TYPE STRING,
PBDNR TYPE STRING,
TECHS TYPE STRING,
EDGNO TYPE STRING,
UMREZ TYPE STRING,
UMREN TYPE STRING,
ERFME TYPE STRING,
DBSKZ TYPE STRING,
WRK02 TYPE STRING,
STLTY TYPE STRING,
STLNR TYPE STRING,
STLKN TYPE STRING,
STPOZ TYPE STRING,
KUNNR TYPE STRING,END OF T_EKKO_STR.
DATA: WA_MDNB_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_MDNB_STR-PLAAB sy-vline 
WA_MDNB_STR-PLANR sy-vline 
WA_MDNB_STR-DAT00 sy-vline 
WA_MDNB_STR-MNG01 sy-vline 
WA_MDNB_STR-MNG03 sy-vline 
WA_MDNB_STR-SERNR sy-vline 
WA_MDNB_STR-VERID sy-vline 
WA_MDNB_STR-CUOBJ sy-vline 
WA_MDNB_STR-KNTTP sy-vline 
WA_MDNB_STR-SOBKZ sy-vline 
WA_MDNB_STR-KZVBR sy-vline 
WA_MDNB_STR-KZBWS sy-vline 
WA_MDNB_STR-KDAUF sy-vline 
WA_MDNB_STR-KDPOS sy-vline 
WA_MDNB_STR-PSPEL sy-vline 
WA_MDNB_STR-ARSNR sy-vline 
WA_MDNB_STR-ARSPS sy-vline 
WA_MDNB_STR-MONKZ sy-vline 
WA_MDNB_STR-VRPLA sy-vline 
WA_MDNB_STR-PBDNR sy-vline 
WA_MDNB_STR-TECHS sy-vline 
WA_MDNB_STR-EDGNO sy-vline 
WA_MDNB_STR-UMREZ sy-vline 
WA_MDNB_STR-UMREN sy-vline 
WA_MDNB_STR-ERFME sy-vline 
WA_MDNB_STR-DBSKZ sy-vline 
WA_MDNB_STR-WRK02 sy-vline 
WA_MDNB_STR-STLTY sy-vline 
WA_MDNB_STR-STLNR sy-vline 
WA_MDNB_STR-STLKN sy-vline 
WA_MDNB_STR-STPOZ sy-vline 
WA_MDNB_STR-KUNNR sy-vline      INTO ld_text SEPARATED BY SPACE.

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