ABAP Select data from SAP table MCCOMVTTP into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM MCCOMVTTP
*  INTO TABLE @DATA(IT_MCCOMVTTP2).
*--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_MCCOMVTTP INDEX 1 INTO DATA(WA_MCCOMVTTP2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<MCCOMVTTP>-MANDT = 1.
<MCCOMVTTP>-TKNUM = 1.
<MCCOMVTTP>-TPNUM = 1.
<MCCOMVTTP>-VBELN = 1.
<MCCOMVTTP>-TPRFO = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_MCCOMVTTP-ERNAM, sy-vline,
  WA_MCCOMVTTP-ERDAT, sy-vline,
  WA_MCCOMVTTP-ERZET, sy-vline,
  WA_MCCOMVTTP-PKSTA, sy-vline,
  WA_MCCOMVTTP-KZHULFG, sy-vline,
  WA_MCCOMVTTP-UPDKZ, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_MCCOMVTTP 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_MCCOMVTTP 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_MCCOMVTTP INTO WA_MCCOMVTTP.


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

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

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

*Conversion exit ALPHA, internal->external for field LIFNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_MCCOMVTTP-LIFNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MCCOMVTTP-LIFNR.
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_MCCOMVTTP_STR, 
MANDT TYPE STRING,
TKNUM TYPE STRING,
TPNUM TYPE STRING,
VBELN TYPE STRING,
TPRFO TYPE STRING,
ERNAM TYPE STRING,
ERDAT TYPE STRING,
ERZET TYPE STRING,
PKSTA TYPE STRING,
KZHULFG TYPE STRING,
UPDKZ TYPE STRING,
NAME1 TYPE STRING,
LAND1 TYPE STRING,
ORT01 TYPE STRING,
REGIO TYPE STRING,
VSTEL TYPE STRING,
LSTEL TYPE STRING,
KUNWE TYPE STRING,
ABLAD TYPE STRING,
WERKS TYPE STRING,
LGORT TYPE STRING,
WERKSBEZ TYPE STRING,
LGOBE TYPE STRING,
LIFNR TYPE STRING,
KZLFETS TYPE STRING,
SUPKZ TYPE STRING,END OF T_EKKO_STR.
DATA: WA_MCCOMVTTP_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_MCCOMVTTP_STR-MANDT sy-vline 
WA_MCCOMVTTP_STR-TKNUM sy-vline 
WA_MCCOMVTTP_STR-TPNUM sy-vline 
WA_MCCOMVTTP_STR-VBELN sy-vline 
WA_MCCOMVTTP_STR-TPRFO sy-vline 
WA_MCCOMVTTP_STR-ERNAM sy-vline 
WA_MCCOMVTTP_STR-ERDAT sy-vline 
WA_MCCOMVTTP_STR-ERZET sy-vline 
WA_MCCOMVTTP_STR-PKSTA sy-vline 
WA_MCCOMVTTP_STR-KZHULFG sy-vline 
WA_MCCOMVTTP_STR-UPDKZ sy-vline 
WA_MCCOMVTTP_STR-NAME1 sy-vline 
WA_MCCOMVTTP_STR-LAND1 sy-vline 
WA_MCCOMVTTP_STR-ORT01 sy-vline 
WA_MCCOMVTTP_STR-REGIO sy-vline 
WA_MCCOMVTTP_STR-VSTEL sy-vline 
WA_MCCOMVTTP_STR-LSTEL sy-vline 
WA_MCCOMVTTP_STR-KUNWE sy-vline 
WA_MCCOMVTTP_STR-ABLAD sy-vline 
WA_MCCOMVTTP_STR-WERKS sy-vline 
WA_MCCOMVTTP_STR-LGORT sy-vline 
WA_MCCOMVTTP_STR-WERKSBEZ sy-vline 
WA_MCCOMVTTP_STR-LGOBE sy-vline 
WA_MCCOMVTTP_STR-LIFNR sy-vline 
WA_MCCOMVTTP_STR-KZLFETS sy-vline 
WA_MCCOMVTTP_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.