ABAP Select data from SAP table MDKS into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM MDKS
*  INTO TABLE @DATA(IT_MDKS2).
*--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_MDKS INDEX 1 INTO DATA(WA_MDKS2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<MDKS>-MANDT = 1.
<MDKS>-AUFNR = 1.
<MDKS>-POSNR = 1.
<MDKS>-MATNR = 1.
<MDKS>-SAFNR = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_MDKS-VERID, sy-vline,
  WA_MDKS-DWERK, sy-vline,
  WA_MDKS-WERKS, sy-vline,
  WA_MDKS-DAUTY, sy-vline,
  WA_MDKS-RTP01, sy-vline,
  WA_MDKS-RTP02, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_MDKS 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_MDKS 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_MDKS INTO WA_MDKS.


*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_MDKS-AUFNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MDKS-AUFNR.
WRITE:/ 'New Value:', ld_input.

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

*Conversion exit ALPHA, internal->external for field SAFNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_MDKS-SAFNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MDKS-SAFNR.
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_MDKS_STR, 
MANDT TYPE STRING,
AUFNR TYPE STRING,
POSNR TYPE STRING,
MATNR TYPE STRING,
SAFNR TYPE STRING,
VERID TYPE STRING,
DWERK TYPE STRING,
WERKS TYPE STRING,
DAUTY TYPE STRING,
RTP01 TYPE STRING,
RTP02 TYPE STRING,
RTP03 TYPE STRING,
KSVON TYPE STRING,
KSBIS TYPE STRING,
AUART TYPE STRING,
AUTYP TYPE STRING,
LOEKZ TYPE STRING,
KALSM TYPE STRING,
ZSCHL TYPE STRING,
AWSLS TYPE STRING,
ABGSL TYPE STRING,
KLVARP TYPE STRING,
KLVARI TYPE STRING,
OBJNR TYPE STRING,
GSBER TYPE STRING,
PROCNR TYPE STRING,END OF T_EKKO_STR.
DATA: WA_MDKS_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_MDKS_STR-MANDT sy-vline 
WA_MDKS_STR-AUFNR sy-vline 
WA_MDKS_STR-POSNR sy-vline 
WA_MDKS_STR-MATNR sy-vline 
WA_MDKS_STR-SAFNR sy-vline 
WA_MDKS_STR-VERID sy-vline 
WA_MDKS_STR-DWERK sy-vline 
WA_MDKS_STR-WERKS sy-vline 
WA_MDKS_STR-DAUTY sy-vline 
WA_MDKS_STR-RTP01 sy-vline 
WA_MDKS_STR-RTP02 sy-vline 
WA_MDKS_STR-RTP03 sy-vline 
WA_MDKS_STR-KSVON sy-vline 
WA_MDKS_STR-KSBIS sy-vline 
WA_MDKS_STR-AUART sy-vline 
WA_MDKS_STR-AUTYP sy-vline 
WA_MDKS_STR-LOEKZ sy-vline 
WA_MDKS_STR-KALSM sy-vline 
WA_MDKS_STR-ZSCHL sy-vline 
WA_MDKS_STR-AWSLS sy-vline 
WA_MDKS_STR-ABGSL sy-vline 
WA_MDKS_STR-KLVARP sy-vline 
WA_MDKS_STR-KLVARI sy-vline 
WA_MDKS_STR-OBJNR sy-vline 
WA_MDKS_STR-GSBER sy-vline 
WA_MDKS_STR-PROCNR sy-vline      INTO ld_text SEPARATED BY SPACE.

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