ABAP Select data from SAP table MCWDATAW 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 MCWDATAW 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 MCWDATAW. 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 MCWDATAW 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_MCWDATAW TYPE STANDARD TABLE OF MCWDATAW,
      WA_MCWDATAW TYPE MCWDATAW,
      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: <MCWDATAW> TYPE MCWDATAW.

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM MCWDATAW
*  INTO TABLE @DATA(IT_MCWDATAW2).
*--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_MCWDATAW INDEX 1 INTO DATA(WA_MCWDATAW2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<MCWDATAW>-WAERK = 1.
<MCWDATAW>-MEINS = 1.
<MCWDATAW>-VRKME = 1.
<MCWDATAW>-BONNR = 1.
<MCWDATAW>-WERKS = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_MCWDATAW-MATNR, sy-vline,
  WA_MCWDATAW-MATKL, sy-vline,
  WA_MCWDATAW-AKTNR, sy-vline,
  WA_MCWDATAW-AFLAG, sy-vline,
  WA_MCWDATAW-EAN11, sy-vline,
  WA_MCWDATAW-PLGTP, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_MCWDATAW 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_MCWDATAW 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_MCWDATAW INTO WA_MCWDATAW.


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

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

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

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

*Conversion exit EAN11, internal->external for field EAN11
CALL FUNCTION 'CONVERSION_EXIT_EAN11_OUTPUT'
  EXPORTING
    input =                      WA_MCWDATAW-EAN11
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MCWDATAW-EAN11.
WRITE:/ 'New Value:', ld_input.

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

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

*Conversion exit GJAHR, internal->external for field SAISJ
CALL FUNCTION 'CONVERSION_EXIT_GJAHR_OUTPUT'
  EXPORTING
    input =                      WA_MCWDATAW-SAISJ
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MCWDATAW-SAISJ.
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_MCWDATAW_STR, 
WAERK TYPE STRING,
MEINS TYPE STRING,
VRKME TYPE STRING,
BONNR TYPE STRING,
WERKS TYPE STRING,
MATNR TYPE STRING,
MATKL TYPE STRING,
AKTNR TYPE STRING,
AFLAG TYPE STRING,
EAN11 TYPE STRING,
PLGTP TYPE STRING,
ATTYP TYPE STRING,
MAKTX TYPE STRING,
AKTYP TYPE STRING,
AKTHE TYPE STRING,
WMINR TYPE STRING,
KUNNR TYPE STRING,
CCNUM TYPE STRING,
CCINS TYPE STRING,
ZMTTL TYPE STRING,
KUNDK TYPE STRING,
VKMNG TYPE STRING,
UMSMNG TYPE STRING,
UMSATZ TYPE STRING,
PRSNLS TYPE STRING,
ANZBON TYPE STRING,
ANZPOS TYPE STRING,
DUPRSP TYPE STRING,
DUPRVE TYPE STRING,
DUPRBE TYPE STRING,
ANZWGR TYPE STRING,
DUANZP TYPE STRING,
DUANZW TYPE STRING,
ANZAAR TYPE STRING,
AKTANT TYPE STRING,
NUTZBE TYPE STRING,
NUTZVE TYPE STRING,
DUBUMS TYPE STRING,
MTART TYPE STRING,
SATNR TYPE STRING,
SAISO TYPE STRING,
SAISJ TYPE STRING,
WERTUM TYPE STRING,
SCANGR TYPE STRING,
ANZBKK TYPE STRING,
ANZAKM TYPE STRING,
ANZAKO TYPE STRING,
BKKANT TYPE STRING,
AKMANT TYPE STRING,
AKOANT TYPE STRING,END OF T_EKKO_STR.
DATA: WA_MCWDATAW_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_MCWDATAW_STR-WAERK sy-vline 
WA_MCWDATAW_STR-MEINS sy-vline 
WA_MCWDATAW_STR-VRKME sy-vline 
WA_MCWDATAW_STR-BONNR sy-vline 
WA_MCWDATAW_STR-WERKS sy-vline 
WA_MCWDATAW_STR-MATNR sy-vline 
WA_MCWDATAW_STR-MATKL sy-vline 
WA_MCWDATAW_STR-AKTNR sy-vline 
WA_MCWDATAW_STR-AFLAG sy-vline 
WA_MCWDATAW_STR-EAN11 sy-vline 
WA_MCWDATAW_STR-PLGTP sy-vline 
WA_MCWDATAW_STR-ATTYP sy-vline 
WA_MCWDATAW_STR-MAKTX sy-vline 
WA_MCWDATAW_STR-AKTYP sy-vline 
WA_MCWDATAW_STR-AKTHE sy-vline 
WA_MCWDATAW_STR-WMINR sy-vline 
WA_MCWDATAW_STR-KUNNR sy-vline 
WA_MCWDATAW_STR-CCNUM sy-vline 
WA_MCWDATAW_STR-CCINS sy-vline 
WA_MCWDATAW_STR-ZMTTL sy-vline 
WA_MCWDATAW_STR-KUNDK sy-vline 
WA_MCWDATAW_STR-VKMNG sy-vline 
WA_MCWDATAW_STR-UMSMNG sy-vline 
WA_MCWDATAW_STR-UMSATZ sy-vline 
WA_MCWDATAW_STR-PRSNLS sy-vline 
WA_MCWDATAW_STR-ANZBON sy-vline 
WA_MCWDATAW_STR-ANZPOS sy-vline 
WA_MCWDATAW_STR-DUPRSP sy-vline 
WA_MCWDATAW_STR-DUPRVE sy-vline 
WA_MCWDATAW_STR-DUPRBE sy-vline 
WA_MCWDATAW_STR-ANZWGR sy-vline 
WA_MCWDATAW_STR-DUANZP sy-vline 
WA_MCWDATAW_STR-DUANZW sy-vline 
WA_MCWDATAW_STR-ANZAAR sy-vline 
WA_MCWDATAW_STR-AKTANT sy-vline 
WA_MCWDATAW_STR-NUTZBE sy-vline 
WA_MCWDATAW_STR-NUTZVE sy-vline 
WA_MCWDATAW_STR-DUBUMS sy-vline 
WA_MCWDATAW_STR-MTART sy-vline 
WA_MCWDATAW_STR-SATNR sy-vline 
WA_MCWDATAW_STR-SAISO sy-vline 
WA_MCWDATAW_STR-SAISJ sy-vline 
WA_MCWDATAW_STR-WERTUM sy-vline 
WA_MCWDATAW_STR-SCANGR sy-vline 
WA_MCWDATAW_STR-ANZBKK sy-vline 
WA_MCWDATAW_STR-ANZAKM sy-vline 
WA_MCWDATAW_STR-ANZAKO sy-vline 
WA_MCWDATAW_STR-BKKANT sy-vline 
WA_MCWDATAW_STR-AKMANT sy-vline 
WA_MCWDATAW_STR-AKOANT sy-vline      INTO ld_text SEPARATED BY SPACE.

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