ABAP Select data from SAP table MCVDNKYF into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM MCVDNKYF
*  INTO TABLE @DATA(IT_MCVDNKYF2).
*--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_MCVDNKYF INDEX 1 INTO DATA(WA_MCVDNKYF2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<MCVDNKYF>-FKIMG = 1.
<MCVDNKYF>-SMENG = 1.
<MCVDNKYF>-FKLMG = 1.
<MCVDNKYF>-LMENG = 1.
<MCVDNKYF>-NTGEW = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_MCVDNKYF-BRGEW, sy-vline,
  WA_MCVDNKYF-VOLUM, sy-vline,
  WA_MCVDNKYF-NETWR, sy-vline,
  WA_MCVDNKYF-SKFBP, sy-vline,
  WA_MCVDNKYF-WAVWR, sy-vline,
  WA_MCVDNKYF-KZWI1, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_MCVDNKYF 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_MCVDNKYF 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_MCVDNKYF INTO WA_MCVDNKYF.


*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.
ENDFORM. 

*&---------------------------------------------------------------------*
*& Form process_as_string_field_values
*&---------------------------------------------------------------------*
FORM process_as_string_field_values CHANGING p_EKKO LIKE wa_EKKO.

TYPES: BEGIN OF T_MCVDNKYF_STR, 
FKIMG TYPE STRING,
SMENG TYPE STRING,
FKLMG TYPE STRING,
LMENG TYPE STRING,
NTGEW TYPE STRING,
BRGEW TYPE STRING,
VOLUM TYPE STRING,
NETWR TYPE STRING,
SKFBP TYPE STRING,
WAVWR TYPE STRING,
KZWI1 TYPE STRING,
KZWI2 TYPE STRING,
KZWI3 TYPE STRING,
KZWI4 TYPE STRING,
KZWI5 TYPE STRING,
KZWI6 TYPE STRING,
BONBA TYPE STRING,
MWSBP TYPE STRING,
ANZFK TYPE STRING,
ANZFKPOS TYPE STRING,END OF T_EKKO_STR.
DATA: WA_MCVDNKYF_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_MCVDNKYF_STR-FKIMG sy-vline 
WA_MCVDNKYF_STR-SMENG sy-vline 
WA_MCVDNKYF_STR-FKLMG sy-vline 
WA_MCVDNKYF_STR-LMENG sy-vline 
WA_MCVDNKYF_STR-NTGEW sy-vline 
WA_MCVDNKYF_STR-BRGEW sy-vline 
WA_MCVDNKYF_STR-VOLUM sy-vline 
WA_MCVDNKYF_STR-NETWR sy-vline 
WA_MCVDNKYF_STR-SKFBP sy-vline 
WA_MCVDNKYF_STR-WAVWR sy-vline 
WA_MCVDNKYF_STR-KZWI1 sy-vline 
WA_MCVDNKYF_STR-KZWI2 sy-vline 
WA_MCVDNKYF_STR-KZWI3 sy-vline 
WA_MCVDNKYF_STR-KZWI4 sy-vline 
WA_MCVDNKYF_STR-KZWI5 sy-vline 
WA_MCVDNKYF_STR-KZWI6 sy-vline 
WA_MCVDNKYF_STR-BONBA sy-vline 
WA_MCVDNKYF_STR-MWSBP sy-vline 
WA_MCVDNKYF_STR-ANZFK sy-vline 
WA_MCVDNKYF_STR-ANZFKPOS sy-vline      INTO ld_text SEPARATED BY SPACE.

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