ABAP Select data from SAP table MCVOBJECT into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM MCVOBJECT
*  INTO TABLE @DATA(IT_MCVOBJECT2).
*--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_MCVOBJECT INDEX 1 INTO DATA(WA_MCVOBJECT2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<MCVOBJECT>-MCUPD = 1.
<MCVOBJECT>-ATINN = 1.
<MCVOBJECT>-ATWRT = 1.
<MCVOBJECT>-KLART = 1.
<MCVOBJECT>-KONOB = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_MCVOBJECT-CHKEYGRP, sy-vline,
  WA_MCVOBJECT-CHCOMBKEY, sy-vline,
  WA_MCVOBJECT-CLINT, sy-vline,
  WA_MCVOBJECT-LNPOS, sy-vline,
  WA_MCVOBJECT-BLTYP, sy-vline,
  WA_MCVOBJECT-KOBLNR, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_MCVOBJECT 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_MCVOBJECT 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_MCVOBJECT INTO WA_MCVOBJECT.


*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 ATINN, internal->external for field ATINN
CALL FUNCTION 'CONVERSION_EXIT_ATINN_OUTPUT'
  EXPORTING
    input =                      WA_MCVOBJECT-ATINN
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MCVOBJECT-ATINN.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field KOBLNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_MCVOBJECT-KOBLNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MCVOBJECT-KOBLNR.
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_MCVOBJECT_STR, 
MCUPD TYPE STRING,
ATINN TYPE STRING,
ATWRT TYPE STRING,
KLART TYPE STRING,
KONOB TYPE STRING,
CHKEYGRP TYPE STRING,
CHCOMBKEY TYPE STRING,
CLINT TYPE STRING,
LNPOS TYPE STRING,
BLTYP TYPE STRING,
KOBLNR TYPE STRING,END OF T_EKKO_STR.
DATA: WA_MCVOBJECT_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_MCVOBJECT_STR-MCUPD sy-vline 
WA_MCVOBJECT_STR-ATINN sy-vline 
WA_MCVOBJECT_STR-ATWRT sy-vline 
WA_MCVOBJECT_STR-KLART sy-vline 
WA_MCVOBJECT_STR-KONOB sy-vline 
WA_MCVOBJECT_STR-CHKEYGRP sy-vline 
WA_MCVOBJECT_STR-CHCOMBKEY sy-vline 
WA_MCVOBJECT_STR-CLINT sy-vline 
WA_MCVOBJECT_STR-LNPOS sy-vline 
WA_MCVOBJECT_STR-BLTYP sy-vline 
WA_MCVOBJECT_STR-KOBLNR sy-vline      INTO ld_text SEPARATED BY SPACE.

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