ABAP Select data from SAP table MCCOMVFKK into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM MCCOMVFKK
*  INTO TABLE @DATA(IT_MCCOMVFKK2).
*--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_MCCOMVFKK INDEX 1 INTO DATA(WA_MCCOMVFKK2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<MCCOMVFKK>-MANDT = 1.
<MCCOMVFKK>-FKNUM = 1.
<MCCOMVFKK>-VBTYP = 1.
<MCCOMVFKK>-FKART = 1.
<MCCOMVFKK>-STERM = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_MCCOMVFKK-PRSDT, sy-vline,
  WA_MCCOMVFKK-BUDAT, sy-vline,
  WA_MCCOMVFKK-EXTI1, sy-vline,
  WA_MCCOMVFKK-EXTI2, sy-vline,
  WA_MCCOMVFKK-STBER, sy-vline,
  WA_MCCOMVFKK-STFRE, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_MCCOMVFKK 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_MCCOMVFKK 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_MCCOMVFKK INTO WA_MCCOMVFKK.


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

*Conversion exit ALPHA, internal->external for field FKNUM_OLD
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_MCCOMVFKK-FKNUM_OLD
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MCCOMVFKK-FKNUM_OLD.
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_MCCOMVFKK_STR, 
MANDT TYPE STRING,
FKNUM TYPE STRING,
VBTYP TYPE STRING,
FKART TYPE STRING,
STERM TYPE STRING,
PRSDT TYPE STRING,
BUDAT TYPE STRING,
EXTI1 TYPE STRING,
EXTI2 TYPE STRING,
STBER TYPE STRING,
STFRE TYPE STRING,
STABR TYPE STRING,
ERNAM TYPE STRING,
ERDAT TYPE STRING,
ERZET TYPE STRING,
AENAM TYPE STRING,
AEDAT TYPE STRING,
AEZET TYPE STRING,
FKNUM_OLD TYPE STRING,
FKPOSL TYPE STRING,
UPDKZ TYPE STRING,
CHANGE TYPE STRING,
INCON TYPE STRING,
SUPKZ TYPE STRING,END OF T_EKKO_STR.
DATA: WA_MCCOMVFKK_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_MCCOMVFKK_STR-MANDT sy-vline 
WA_MCCOMVFKK_STR-FKNUM sy-vline 
WA_MCCOMVFKK_STR-VBTYP sy-vline 
WA_MCCOMVFKK_STR-FKART sy-vline 
WA_MCCOMVFKK_STR-STERM sy-vline 
WA_MCCOMVFKK_STR-PRSDT sy-vline 
WA_MCCOMVFKK_STR-BUDAT sy-vline 
WA_MCCOMVFKK_STR-EXTI1 sy-vline 
WA_MCCOMVFKK_STR-EXTI2 sy-vline 
WA_MCCOMVFKK_STR-STBER sy-vline 
WA_MCCOMVFKK_STR-STFRE sy-vline 
WA_MCCOMVFKK_STR-STABR sy-vline 
WA_MCCOMVFKK_STR-ERNAM sy-vline 
WA_MCCOMVFKK_STR-ERDAT sy-vline 
WA_MCCOMVFKK_STR-ERZET sy-vline 
WA_MCCOMVFKK_STR-AENAM sy-vline 
WA_MCCOMVFKK_STR-AEDAT sy-vline 
WA_MCCOMVFKK_STR-AEZET sy-vline 
WA_MCCOMVFKK_STR-FKNUM_OLD sy-vline 
WA_MCCOMVFKK_STR-FKPOSL sy-vline 
WA_MCCOMVFKK_STR-UPDKZ sy-vline 
WA_MCCOMVFKK_STR-CHANGE sy-vline 
WA_MCCOMVFKK_STR-INCON sy-vline 
WA_MCCOMVFKK_STR-SUPKZ sy-vline      INTO ld_text SEPARATED BY SPACE.

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