ABAP Select data from SAP table WFCS_MDST_KEY into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM WFCS_MDST_KEY
*  INTO TABLE @DATA(IT_WFCS_MDST_KEY2).
*--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_WFCS_MDST_KEY INDEX 1 INTO DATA(WA_WFCS_MDST_KEY2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<WFCS_MDST_KEY>-WERKS = 1.
<WFCS_MDST_KEY>-KUNNR = 1.
<WFCS_MDST_KEY>-MATNR = 1.
<WFCS_MDST_KEY>-DAT_FROM_H = 1.
<WFCS_MDST_KEY>-DAT_TO_H = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_WFCS_MDST_KEY-DAT_FROM_F, sy-vline,
  WA_WFCS_MDST_KEY-DAT_TO_F, sy-vline,
  WA_WFCS_MDST_KEY-PNUM1, sy-vline,
  WA_WFCS_MDST_KEY-PNUM2, sy-vline,
  WA_WFCS_MDST_KEY-PROPR, sy-vline,
  WA_WFCS_MDST_KEY-PERKZ, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_WFCS_MDST_KEY 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_WFCS_MDST_KEY 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_WFCS_MDST_KEY INTO WA_WFCS_MDST_KEY.


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

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

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

*Conversion exit CUNIT, internal->external for field MEINS
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_WFCS_MDST_KEY-MEINS
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_WFCS_MDST_KEY-MEINS.
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_WFCS_MDST_KEY_STR, 
WERKS TYPE STRING,
KUNNR TYPE STRING,
MATNR TYPE STRING,
DAT_FROM_H TYPE STRING,
DAT_TO_H TYPE STRING,
DAT_FROM_F TYPE STRING,
DAT_TO_F TYPE STRING,
PNUM1 TYPE STRING,
PNUM2 TYPE STRING,
PROPR TYPE STRING,
PERKZ TYPE STRING,
PERIV TYPE STRING,
FABKL TYPE STRING,
PRDAT TYPE STRING,
PRMOD TYPE STRING,
MODAW TYPE STRING,
MODAV TYPE STRING,
KZPAR TYPE STRING,
OPGRA TYPE STRING,
KZINI TYPE STRING,
ALPHA TYPE STRING,
BETA1 TYPE STRING,
GAMMA TYPE STRING,
DELTA TYPE STRING,
EPSIL TYPE STRING,
SIGGR TYPE STRING,
PERAN TYPE STRING,
PERIN TYPE STRING,
PEREX TYPE STRING,
PERIO TYPE STRING,
ANZPR TYPE STRING,
FIMON TYPE STRING,
LGRAD TYPE STRING,
GWERT TYPE STRING,
VMGWE TYPE STRING,
GWER1 TYPE STRING,
VMGW1 TYPE STRING,
GWER2 TYPE STRING,
VMGW2 TYPE STRING,
TWERT TYPE STRING,
VMTWE TYPE STRING,
PRMAD TYPE STRING,
VMMAD TYPE STRING,
FSUMM TYPE STRING,
VMFSU TYPE STRING,
AUSNA TYPE STRING,
PROAB TYPE STRING,
KZOKO TYPE STRING,
GEWGR TYPE STRING,
THKOF TYPE STRING,
NULLV TYPE STRING,
PRWUG TYPE STRING,
PRWOG TYPE STRING,
PRROS TYPE STRING,
PRKUM TYPE STRING,
PRZGF TYPE STRING,
AKTPE TYPE STRING,
PSTAT TYPE STRING,
MMSTA TYPE STRING,
MMSTD TYPE STRING,
DISMM TYPE STRING,
PLIFZ TYPE STRING,
WEBAZ TYPE STRING,
BESKZ TYPE STRING,
MINBE TYPE STRING,
EISBE TYPE STRING,
BSTMI TYPE STRING,
BSTMA TYPE STRING,
BSTFE TYPE STRING,
MABST TYPE STRING,
FHORI TYPE STRING,
BEARZ TYPE STRING,
RUEZT TYPE STRING,
TRANZ TYPE STRING,
BASMG TYPE STRING,
DZEIT TYPE STRING,
VRBMT TYPE STRING,
VRBWK TYPE STRING,
VRBDT TYPE STRING,
VRBFK TYPE STRING,
AUTRU TYPE STRING,
KZAGL TYPE STRING,
EISLO TYPE STRING,
KZSIB TYPE STRING,
KZMEB TYPE STRING,
LVORM TYPE STRING,
MATKL TYPE STRING,
MEINS TYPE STRING,
MSTAE TYPE STRING,
MSTDE TYPE STRING,
ANDEC TYPE STRING,END OF T_EKKO_STR.
DATA: WA_WFCS_MDST_KEY_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_WFCS_MDST_KEY_STR-WERKS sy-vline 
WA_WFCS_MDST_KEY_STR-KUNNR sy-vline 
WA_WFCS_MDST_KEY_STR-MATNR sy-vline 
WA_WFCS_MDST_KEY_STR-DAT_FROM_H sy-vline 
WA_WFCS_MDST_KEY_STR-DAT_TO_H sy-vline 
WA_WFCS_MDST_KEY_STR-DAT_FROM_F sy-vline 
WA_WFCS_MDST_KEY_STR-DAT_TO_F sy-vline 
WA_WFCS_MDST_KEY_STR-PNUM1 sy-vline 
WA_WFCS_MDST_KEY_STR-PNUM2 sy-vline 
WA_WFCS_MDST_KEY_STR-PROPR sy-vline 
WA_WFCS_MDST_KEY_STR-PERKZ sy-vline 
WA_WFCS_MDST_KEY_STR-PERIV sy-vline 
WA_WFCS_MDST_KEY_STR-FABKL sy-vline 
WA_WFCS_MDST_KEY_STR-PRDAT sy-vline 
WA_WFCS_MDST_KEY_STR-PRMOD sy-vline 
WA_WFCS_MDST_KEY_STR-MODAW sy-vline 
WA_WFCS_MDST_KEY_STR-MODAV sy-vline 
WA_WFCS_MDST_KEY_STR-KZPAR sy-vline 
WA_WFCS_MDST_KEY_STR-OPGRA sy-vline 
WA_WFCS_MDST_KEY_STR-KZINI sy-vline 
WA_WFCS_MDST_KEY_STR-ALPHA sy-vline 
WA_WFCS_MDST_KEY_STR-BETA1 sy-vline 
WA_WFCS_MDST_KEY_STR-GAMMA sy-vline 
WA_WFCS_MDST_KEY_STR-DELTA sy-vline 
WA_WFCS_MDST_KEY_STR-EPSIL sy-vline 
WA_WFCS_MDST_KEY_STR-SIGGR sy-vline 
WA_WFCS_MDST_KEY_STR-PERAN sy-vline 
WA_WFCS_MDST_KEY_STR-PERIN sy-vline 
WA_WFCS_MDST_KEY_STR-PEREX sy-vline 
WA_WFCS_MDST_KEY_STR-PERIO sy-vline 
WA_WFCS_MDST_KEY_STR-ANZPR sy-vline 
WA_WFCS_MDST_KEY_STR-FIMON sy-vline 
WA_WFCS_MDST_KEY_STR-LGRAD sy-vline 
WA_WFCS_MDST_KEY_STR-GWERT sy-vline 
WA_WFCS_MDST_KEY_STR-VMGWE sy-vline 
WA_WFCS_MDST_KEY_STR-GWER1 sy-vline 
WA_WFCS_MDST_KEY_STR-VMGW1 sy-vline 
WA_WFCS_MDST_KEY_STR-GWER2 sy-vline 
WA_WFCS_MDST_KEY_STR-VMGW2 sy-vline 
WA_WFCS_MDST_KEY_STR-TWERT sy-vline 
WA_WFCS_MDST_KEY_STR-VMTWE sy-vline 
WA_WFCS_MDST_KEY_STR-PRMAD sy-vline 
WA_WFCS_MDST_KEY_STR-VMMAD sy-vline 
WA_WFCS_MDST_KEY_STR-FSUMM sy-vline 
WA_WFCS_MDST_KEY_STR-VMFSU sy-vline 
WA_WFCS_MDST_KEY_STR-AUSNA sy-vline 
WA_WFCS_MDST_KEY_STR-PROAB sy-vline 
WA_WFCS_MDST_KEY_STR-KZOKO sy-vline 
WA_WFCS_MDST_KEY_STR-GEWGR sy-vline 
WA_WFCS_MDST_KEY_STR-THKOF sy-vline 
WA_WFCS_MDST_KEY_STR-NULLV sy-vline 
WA_WFCS_MDST_KEY_STR-PRWUG sy-vline 
WA_WFCS_MDST_KEY_STR-PRWOG sy-vline 
WA_WFCS_MDST_KEY_STR-PRROS sy-vline 
WA_WFCS_MDST_KEY_STR-PRKUM sy-vline 
WA_WFCS_MDST_KEY_STR-PRZGF sy-vline 
WA_WFCS_MDST_KEY_STR-AKTPE sy-vline 
WA_WFCS_MDST_KEY_STR-PSTAT sy-vline 
WA_WFCS_MDST_KEY_STR-MMSTA sy-vline 
WA_WFCS_MDST_KEY_STR-MMSTD sy-vline 
WA_WFCS_MDST_KEY_STR-DISMM sy-vline 
WA_WFCS_MDST_KEY_STR-PLIFZ sy-vline 
WA_WFCS_MDST_KEY_STR-WEBAZ sy-vline 
WA_WFCS_MDST_KEY_STR-BESKZ sy-vline 
WA_WFCS_MDST_KEY_STR-MINBE sy-vline 
WA_WFCS_MDST_KEY_STR-EISBE sy-vline 
WA_WFCS_MDST_KEY_STR-BSTMI sy-vline 
WA_WFCS_MDST_KEY_STR-BSTMA sy-vline 
WA_WFCS_MDST_KEY_STR-BSTFE sy-vline 
WA_WFCS_MDST_KEY_STR-MABST sy-vline 
WA_WFCS_MDST_KEY_STR-FHORI sy-vline 
WA_WFCS_MDST_KEY_STR-BEARZ sy-vline 
WA_WFCS_MDST_KEY_STR-RUEZT sy-vline 
WA_WFCS_MDST_KEY_STR-TRANZ sy-vline 
WA_WFCS_MDST_KEY_STR-BASMG sy-vline 
WA_WFCS_MDST_KEY_STR-DZEIT sy-vline 
WA_WFCS_MDST_KEY_STR-VRBMT sy-vline 
WA_WFCS_MDST_KEY_STR-VRBWK sy-vline 
WA_WFCS_MDST_KEY_STR-VRBDT sy-vline 
WA_WFCS_MDST_KEY_STR-VRBFK sy-vline 
WA_WFCS_MDST_KEY_STR-AUTRU sy-vline 
WA_WFCS_MDST_KEY_STR-KZAGL sy-vline 
WA_WFCS_MDST_KEY_STR-EISLO sy-vline 
WA_WFCS_MDST_KEY_STR-KZSIB sy-vline 
WA_WFCS_MDST_KEY_STR-KZMEB sy-vline 
WA_WFCS_MDST_KEY_STR-LVORM sy-vline 
WA_WFCS_MDST_KEY_STR-MATKL sy-vline 
WA_WFCS_MDST_KEY_STR-MEINS sy-vline 
WA_WFCS_MDST_KEY_STR-MSTAE sy-vline 
WA_WFCS_MDST_KEY_STR-MSTDE sy-vline 
WA_WFCS_MDST_KEY_STR-ANDEC sy-vline      INTO ld_text SEPARATED BY SPACE.

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