ABAP Select data from SAP table COM_CLASS_DATA_INTERFACE into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM COM_CLASS_DATA_INTERFACE
*  INTO TABLE @DATA(IT_COM_CLASS_DATA_INTERFACE2).
*--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_COM_CLASS_DATA_INTERFACE INDEX 1 INTO DATA(WA_COM_CLASS_DATA_INTERFACE2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<COM_CLASS_DATA_INTERFACE>-PLNTY = 1.
<COM_CLASS_DATA_INTERFACE>-PLNNR = 1.
<COM_CLASS_DATA_INTERFACE>-PLNAL = 1.
<COM_CLASS_DATA_INTERFACE>-PLNFL = 1.
<COM_CLASS_DATA_INTERFACE>-AENNR = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_COM_CLASS_DATA_INTERFACE-DATUV, sy-vline,
  WA_COM_CLASS_DATA_INTERFACE-AENNR_AUS, sy-vline,
  WA_COM_CLASS_DATA_INTERFACE-DATUB, sy-vline,
  WA_COM_CLASS_DATA_INTERFACE-LOEKZ, sy-vline,
  WA_COM_CLASS_DATA_INTERFACE-VORNR, sy-vline,
  WA_COM_CLASS_DATA_INTERFACE-OPRID, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_COM_CLASS_DATA_INTERFACE 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_COM_CLASS_DATA_INTERFACE 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_COM_CLASS_DATA_INTERFACE INTO WA_COM_CLASS_DATA_INTERFACE.


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

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

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

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

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

*Conversion exit NUMCV, internal->external for field VORNR
CALL FUNCTION 'CONVERSION_EXIT_NUMCV_OUTPUT'
  EXPORTING
    input =                      WA_COM_CLASS_DATA_INTERFACE-VORNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_COM_CLASS_DATA_INTERFACE-VORNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit NUMCV, internal->external for field STLNR
CALL FUNCTION 'CONVERSION_EXIT_NUMCV_OUTPUT'
  EXPORTING
    input =                      WA_COM_CLASS_DATA_INTERFACE-STLNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_COM_CLASS_DATA_INTERFACE-STLNR.
WRITE:/ 'New Value:', ld_input.

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

*Conversion exit NUMCV, internal->external for field POSNR
CALL FUNCTION 'CONVERSION_EXIT_NUMCV_OUTPUT'
  EXPORTING
    input =                      WA_COM_CLASS_DATA_INTERFACE-POSNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_COM_CLASS_DATA_INTERFACE-POSNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit CUNIT, internal->external for field ZUMEI
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_COM_CLASS_DATA_INTERFACE-ZUMEI
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_COM_CLASS_DATA_INTERFACE-ZUMEI.
WRITE:/ 'New Value:', ld_input.

*Conversion exit CUNIT, internal->external for field IMEIN
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_COM_CLASS_DATA_INTERFACE-IMEIN
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_COM_CLASS_DATA_INTERFACE-IMEIN.
WRITE:/ 'New Value:', ld_input.

*Conversion exit MATN1, internal->external for field BOMAT
CALL FUNCTION 'CONVERSION_EXIT_MATN1_OUTPUT'
  EXPORTING
    input =                      WA_COM_CLASS_DATA_INTERFACE-BOMAT
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_COM_CLASS_DATA_INTERFACE-BOMAT.
WRITE:/ 'New Value:', ld_input.

*Conversion exit NUMCV, internal->external for field STLNR_W
CALL FUNCTION 'CONVERSION_EXIT_NUMCV_OUTPUT'
  EXPORTING
    input =                      WA_COM_CLASS_DATA_INTERFACE-STLNR_W
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_COM_CLASS_DATA_INTERFACE-STLNR_W.
WRITE:/ 'New Value:', ld_input.

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

*Conversion exit ALPHA, internal->external for field VERSN
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_COM_CLASS_DATA_INTERFACE-VERSN
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_COM_CLASS_DATA_INTERFACE-VERSN.
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_COM_CLASS_DATA_INTERFACE_STR, 
PLNTY TYPE STRING,
PLNNR TYPE STRING,
PLNAL TYPE STRING,
PLNFL TYPE STRING,
AENNR TYPE STRING,
DATUV TYPE STRING,
AENNR_AUS TYPE STRING,
DATUB TYPE STRING,
LOEKZ TYPE STRING,
VORNR TYPE STRING,
OPRID TYPE STRING,
STLTY TYPE STRING,
STLNR TYPE STRING,
STLAL TYPE STRING,
IDENT_ITM TYPE STRING,
POSNR TYPE STRING,
ZUDIV TYPE STRING,
ZUMS1 TYPE STRING,
ZUMS2 TYPE STRING,
ZUMS3 TYPE STRING,
ZUMEI TYPE STRING,
CUTTING_MEASURE_UNIT_ISO TYPE STRING,
IMENG TYPE STRING,
IMEIN TYPE STRING,
COMP_UNIT_ISO TYPE STRING,
RGEKZ TYPE STRING,
WERKS TYPE STRING,
BOMAT TYPE STRING,
STLST TYPE STRING,
STLWG TYPE STRING,
STLTY_W TYPE STRING,
STLNR_W TYPE STRING,
STLAL_W TYPE STRING,
KANTE TYPE STRING,
VERSN TYPE STRING,
BOM_VERSN TYPE STRING,
BOM_VERSN_W TYPE STRING,END OF T_EKKO_STR.
DATA: WA_COM_CLASS_DATA_INTERFACE_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_COM_CLASS_DATA_INTERFACE_STR-PLNTY sy-vline 
WA_COM_CLASS_DATA_INTERFACE_STR-PLNNR sy-vline 
WA_COM_CLASS_DATA_INTERFACE_STR-PLNAL sy-vline 
WA_COM_CLASS_DATA_INTERFACE_STR-PLNFL sy-vline 
WA_COM_CLASS_DATA_INTERFACE_STR-AENNR sy-vline 
WA_COM_CLASS_DATA_INTERFACE_STR-DATUV sy-vline 
WA_COM_CLASS_DATA_INTERFACE_STR-AENNR_AUS sy-vline 
WA_COM_CLASS_DATA_INTERFACE_STR-DATUB sy-vline 
WA_COM_CLASS_DATA_INTERFACE_STR-LOEKZ sy-vline 
WA_COM_CLASS_DATA_INTERFACE_STR-VORNR sy-vline 
WA_COM_CLASS_DATA_INTERFACE_STR-OPRID sy-vline 
WA_COM_CLASS_DATA_INTERFACE_STR-STLTY sy-vline 
WA_COM_CLASS_DATA_INTERFACE_STR-STLNR sy-vline 
WA_COM_CLASS_DATA_INTERFACE_STR-STLAL sy-vline 
WA_COM_CLASS_DATA_INTERFACE_STR-IDENT_ITM sy-vline 
WA_COM_CLASS_DATA_INTERFACE_STR-POSNR sy-vline 
WA_COM_CLASS_DATA_INTERFACE_STR-ZUDIV sy-vline 
WA_COM_CLASS_DATA_INTERFACE_STR-ZUMS1 sy-vline 
WA_COM_CLASS_DATA_INTERFACE_STR-ZUMS2 sy-vline 
WA_COM_CLASS_DATA_INTERFACE_STR-ZUMS3 sy-vline 
WA_COM_CLASS_DATA_INTERFACE_STR-ZUMEI sy-vline 
WA_COM_CLASS_DATA_INTERFACE_STR-CUTTING_MEASURE_UNIT_ISO sy-vline 
WA_COM_CLASS_DATA_INTERFACE_STR-IMENG sy-vline 
WA_COM_CLASS_DATA_INTERFACE_STR-IMEIN sy-vline 
WA_COM_CLASS_DATA_INTERFACE_STR-COMP_UNIT_ISO sy-vline 
WA_COM_CLASS_DATA_INTERFACE_STR-RGEKZ sy-vline 
WA_COM_CLASS_DATA_INTERFACE_STR-WERKS sy-vline 
WA_COM_CLASS_DATA_INTERFACE_STR-BOMAT sy-vline 
WA_COM_CLASS_DATA_INTERFACE_STR-STLST sy-vline 
WA_COM_CLASS_DATA_INTERFACE_STR-STLWG sy-vline 
WA_COM_CLASS_DATA_INTERFACE_STR-STLTY_W sy-vline 
WA_COM_CLASS_DATA_INTERFACE_STR-STLNR_W sy-vline 
WA_COM_CLASS_DATA_INTERFACE_STR-STLAL_W sy-vline 
WA_COM_CLASS_DATA_INTERFACE_STR-KANTE sy-vline 
WA_COM_CLASS_DATA_INTERFACE_STR-VERSN sy-vline 
WA_COM_CLASS_DATA_INTERFACE_STR-BOM_VERSN sy-vline 
WA_COM_CLASS_DATA_INTERFACE_STR-BOM_VERSN_W sy-vline      INTO ld_text SEPARATED BY SPACE.

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