ABAP Select data from SAP table MDSK into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM MDSK
*  INTO TABLE @DATA(IT_MDSK2).
*--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_MDSK INDEX 1 INTO DATA(WA_MDSK2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<MDSK>-STLTY = 1.
<MDSK>-STLNR = 1.
<MDSK>-STALT = 1.
<MDSK>-LOEKZ = 1.
<MDSK>-LOEVM = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_MDSK-STSTA, sy-vline,
  WA_MDSK-DATUV, sy-vline,
  WA_MDSK-DATUB, sy-vline,
  WA_MDSK-TECHV, sy-vline,
  WA_MDSK-TECHB, sy-vline,
  WA_MDSK-AENNR, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_MDSK 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_MDSK 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_MDSK INTO WA_MDSK.


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

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

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

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

*Conversion exit ISOLA, internal->external for field LTXSP
CALL FUNCTION 'CONVERSION_EXIT_ISOLA_OUTPUT'
  EXPORTING
    input =                      WA_MDSK-LTXSP
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MDSK-LTXSP.
WRITE:/ 'New Value:', ld_input.

*Conversion exit CCMAT, internal->external for field MATNR_LO
CALL FUNCTION 'CONVERSION_EXIT_CCMAT_OUTPUT'
  EXPORTING
    input =                      WA_MDSK-MATNR_LO
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MDSK-MATNR_LO.
WRITE:/ 'New Value:', ld_input.

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

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

*Conversion exit ALPHA, internal->external for field STARTUP_LO
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_MDSK-STARTUP_LO
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MDSK-STARTUP_LO.
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_MDSK_STR, 
STLTY TYPE STRING,
STLNR TYPE STRING,
STALT TYPE STRING,
LOEKZ TYPE STRING,
LOEVM TYPE STRING,
STSTA TYPE STRING,
DATUV TYPE STRING,
DATUB TYPE STRING,
TECHV TYPE STRING,
TECHB TYPE STRING,
AENNR TYPE STRING,
STBMG TYPE STRING,
STBME TYPE STRING,
LTXSP TYPE STRING,
STKTX TYPE STRING,
STKZA TYPE STRING,
BOM_VERSN TYPE STRING,
VERSNST TYPE STRING,
DATE_LO TYPE STRING,
DATE_HI TYPE STRING,
DATE_OI TYPE STRING,
MATNR_LO TYPE STRING,
SERNR_LO TYPE STRING,
SERNR_HI TYPE STRING,
PRODUCT_LO TYPE STRING,
CLASS_LO TYPE STRING,
CLASSTY_LO TYPE STRING,
PLANT_LO TYPE STRING,
STARTUP_LO TYPE STRING,
LOCNO_LO TYPE STRING,
SERNR_OI TYPE STRING,END OF T_EKKO_STR.
DATA: WA_MDSK_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_MDSK_STR-STLTY sy-vline 
WA_MDSK_STR-STLNR sy-vline 
WA_MDSK_STR-STALT sy-vline 
WA_MDSK_STR-LOEKZ sy-vline 
WA_MDSK_STR-LOEVM sy-vline 
WA_MDSK_STR-STSTA sy-vline 
WA_MDSK_STR-DATUV sy-vline 
WA_MDSK_STR-DATUB sy-vline 
WA_MDSK_STR-TECHV sy-vline 
WA_MDSK_STR-TECHB sy-vline 
WA_MDSK_STR-AENNR sy-vline 
WA_MDSK_STR-STBMG sy-vline 
WA_MDSK_STR-STBME sy-vline 
WA_MDSK_STR-LTXSP sy-vline 
WA_MDSK_STR-STKTX sy-vline 
WA_MDSK_STR-STKZA sy-vline 
WA_MDSK_STR-BOM_VERSN sy-vline 
WA_MDSK_STR-VERSNST sy-vline 
WA_MDSK_STR-DATE_LO sy-vline 
WA_MDSK_STR-DATE_HI sy-vline 
WA_MDSK_STR-DATE_OI sy-vline 
WA_MDSK_STR-MATNR_LO sy-vline 
WA_MDSK_STR-SERNR_LO sy-vline 
WA_MDSK_STR-SERNR_HI sy-vline 
WA_MDSK_STR-PRODUCT_LO sy-vline 
WA_MDSK_STR-CLASS_LO sy-vline 
WA_MDSK_STR-CLASSTY_LO sy-vline 
WA_MDSK_STR-PLANT_LO sy-vline 
WA_MDSK_STR-STARTUP_LO sy-vline 
WA_MDSK_STR-LOCNO_LO sy-vline 
WA_MDSK_STR-SERNR_OI sy-vline      INTO ld_text SEPARATED BY SPACE.

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