ABAP Select data from SAP table MCWHISINV into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM MCWHISINV
*  INTO TABLE @DATA(IT_MCWHISINV2).
*--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_MCWHISINV INDEX 1 INTO DATA(WA_MCWHISINV2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<MCWHISINV>-IBLNR = 1.
<MCWHISINV>-ZEILI = 1.
<MCWHISINV>-XNZAE = 1.
<MCWHISINV>-XDIFF = 1.
<MCWHISINV>-XZAEL = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_MCWHISINV-XLOEK, sy-vline,
  WA_MCWHISINV-XNULL, sy-vline,
  WA_MCWHISINV-DMBTR, sy-vline,
  WA_MCWHISINV-VKWRA, sy-vline,
  WA_MCWHISINV-VKWRT, sy-vline,
  WA_MCWHISINV-EXVKW, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_MCWHISINV 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_MCWHISINV 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_MCWHISINV INTO WA_MCWHISINV.


*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 IBLNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_MCWHISINV-IBLNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MCWHISINV-IBLNR.
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_MCWHISINV_STR, 
IBLNR TYPE STRING,
ZEILI TYPE STRING,
XNZAE TYPE STRING,
XDIFF TYPE STRING,
XZAEL TYPE STRING,
XLOEK TYPE STRING,
XNULL TYPE STRING,
DMBTR TYPE STRING,
VKWRA TYPE STRING,
VKWRT TYPE STRING,
EXVKW TYPE STRING,
VKMZL TYPE STRING,
VKNZL TYPE STRING,
WRTZL TYPE STRING,
WRTBM TYPE STRING,
DIWZL TYPE STRING,
BUCHM TYPE STRING,
BUCHW TYPE STRING,
MENGE TYPE STRING,END OF T_EKKO_STR.
DATA: WA_MCWHISINV_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_MCWHISINV_STR-IBLNR sy-vline 
WA_MCWHISINV_STR-ZEILI sy-vline 
WA_MCWHISINV_STR-XNZAE sy-vline 
WA_MCWHISINV_STR-XDIFF sy-vline 
WA_MCWHISINV_STR-XZAEL sy-vline 
WA_MCWHISINV_STR-XLOEK sy-vline 
WA_MCWHISINV_STR-XNULL sy-vline 
WA_MCWHISINV_STR-DMBTR sy-vline 
WA_MCWHISINV_STR-VKWRA sy-vline 
WA_MCWHISINV_STR-VKWRT sy-vline 
WA_MCWHISINV_STR-EXVKW sy-vline 
WA_MCWHISINV_STR-VKMZL sy-vline 
WA_MCWHISINV_STR-VKNZL sy-vline 
WA_MCWHISINV_STR-WRTZL sy-vline 
WA_MCWHISINV_STR-WRTBM sy-vline 
WA_MCWHISINV_STR-DIWZL sy-vline 
WA_MCWHISINV_STR-BUCHM sy-vline 
WA_MCWHISINV_STR-BUCHW sy-vline 
WA_MCWHISINV_STR-MENGE sy-vline      INTO ld_text SEPARATED BY SPACE.

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