ABAP Select data from SAP table COM_ALLOCATION into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP COM_ALLOCATION 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_ALLOCATION. 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_ALLOCATION 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_ALLOCATION TYPE STANDARD TABLE OF COM_ALLOCATION,
      WA_COM_ALLOCATION TYPE COM_ALLOCATION,
      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_ALLOCATION> TYPE COM_ALLOCATION.

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM COM_ALLOCATION
*  INTO TABLE @DATA(IT_COM_ALLOCATION2).
*--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_ALLOCATION INDEX 1 INTO DATA(WA_COM_ALLOCATION2).


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

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

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_COM_ALLOCATION-STLST, sy-vline,
  WA_COM_ALLOCATION-SLTWG, sy-vline,
  WA_COM_ALLOCATION-STLTY_W, sy-vline,
  WA_COM_ALLOCATION-STLNR_W, sy-vline,
  WA_COM_ALLOCATION-STLAL_W, sy-vline,
  WA_COM_ALLOCATION-LOEKZ, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_COM_ALLOCATION 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_ALLOCATION 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_ALLOCATION INTO WA_COM_ALLOCATION.


*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_ALLOCATION-PLNNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_COM_ALLOCATION-PLNNR.
WRITE:/ 'New Value:', ld_input.

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

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

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

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

*Conversion exit CUNIT, internal->external for field IMEIN
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_COM_ALLOCATION-IMEIN
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_COM_ALLOCATION-IMEIN.
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_ALLOCATION_STR, 
PLNTY TYPE STRING,
PLNNR TYPE STRING,
PLNAL TYPE STRING,
PLNFL TYPE STRING,
PLNKN TYPE STRING,
STLST TYPE STRING,
SLTWG TYPE STRING,
STLTY_W TYPE STRING,
STLNR_W TYPE STRING,
STLAL_W TYPE STRING,
LOEKZ TYPE STRING,
RGEKZ TYPE STRING,
ZUONR TYPE STRING,
ZAEHL TYPE STRING,
ZUDIV TYPE STRING,
ZUMS1 TYPE STRING,
ZUMS2 TYPE STRING,
ZUMS3 TYPE STRING,
ZUMEI TYPE STRING,
IMENG TYPE STRING,
IMEIN TYPE STRING,END OF T_EKKO_STR.
DATA: WA_COM_ALLOCATION_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_ALLOCATION_STR-PLNTY sy-vline 
WA_COM_ALLOCATION_STR-PLNNR sy-vline 
WA_COM_ALLOCATION_STR-PLNAL sy-vline 
WA_COM_ALLOCATION_STR-PLNFL sy-vline 
WA_COM_ALLOCATION_STR-PLNKN sy-vline 
WA_COM_ALLOCATION_STR-STLST sy-vline 
WA_COM_ALLOCATION_STR-SLTWG sy-vline 
WA_COM_ALLOCATION_STR-STLTY_W sy-vline 
WA_COM_ALLOCATION_STR-STLNR_W sy-vline 
WA_COM_ALLOCATION_STR-STLAL_W sy-vline 
WA_COM_ALLOCATION_STR-LOEKZ sy-vline 
WA_COM_ALLOCATION_STR-RGEKZ sy-vline 
WA_COM_ALLOCATION_STR-ZUONR sy-vline 
WA_COM_ALLOCATION_STR-ZAEHL sy-vline 
WA_COM_ALLOCATION_STR-ZUDIV sy-vline 
WA_COM_ALLOCATION_STR-ZUMS1 sy-vline 
WA_COM_ALLOCATION_STR-ZUMS2 sy-vline 
WA_COM_ALLOCATION_STR-ZUMS3 sy-vline 
WA_COM_ALLOCATION_STR-ZUMEI sy-vline 
WA_COM_ALLOCATION_STR-IMENG sy-vline 
WA_COM_ALLOCATION_STR-IMEIN sy-vline      INTO ld_text SEPARATED BY SPACE.

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