ABAP Select data from SAP table COMPPRT into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM COMPPRT
*  INTO TABLE @DATA(IT_COMPPRT2).
*--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_COMPPRT INDEX 1 INTO DATA(WA_COMPPRT2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<COMPPRT>-MANDT = 1.
<COMPPRT>-COMPNUM = 1.
<COMPPRT>-COMPCNT = 1.
<COMPPRT>-VSNMR1 = 1.
<COMPPRT>-AUFPL1 = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_COMPPRT-PZLFH1, sy-vline,
  WA_COMPPRT-APLZL1, sy-vline,
  WA_COMPPRT-VSNMR2, sy-vline,
  WA_COMPPRT-AUFPL2, sy-vline,
  WA_COMPPRT-PZLFH2, sy-vline,
  WA_COMPPRT-APLZL2, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_COMPPRT 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_COMPPRT 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_COMPPRT INTO WA_COMPPRT.


*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 AENNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_COMPPRT-AENNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_COMPPRT-AENNR.
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_COMPPRT_STR, 
MANDT TYPE STRING,
COMPNUM TYPE STRING,
COMPCNT TYPE STRING,
VSNMR1 TYPE STRING,
AUFPL1 TYPE STRING,
PZLFH1 TYPE STRING,
APLZL1 TYPE STRING,
VSNMR2 TYPE STRING,
AUFPL2 TYPE STRING,
PZLFH2 TYPE STRING,
APLZL2 TYPE STRING,
RESULT TYPE STRING,
CONFTYP TYPE STRING,
STATUS TYPE STRING,
EXKEY TYPE STRING,
FHKTX TYPE STRING,
AENNR TYPE STRING,END OF T_EKKO_STR.
DATA: WA_COMPPRT_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_COMPPRT_STR-MANDT sy-vline 
WA_COMPPRT_STR-COMPNUM sy-vline 
WA_COMPPRT_STR-COMPCNT sy-vline 
WA_COMPPRT_STR-VSNMR1 sy-vline 
WA_COMPPRT_STR-AUFPL1 sy-vline 
WA_COMPPRT_STR-PZLFH1 sy-vline 
WA_COMPPRT_STR-APLZL1 sy-vline 
WA_COMPPRT_STR-VSNMR2 sy-vline 
WA_COMPPRT_STR-AUFPL2 sy-vline 
WA_COMPPRT_STR-PZLFH2 sy-vline 
WA_COMPPRT_STR-APLZL2 sy-vline 
WA_COMPPRT_STR-RESULT sy-vline 
WA_COMPPRT_STR-CONFTYP sy-vline 
WA_COMPPRT_STR-STATUS sy-vline 
WA_COMPPRT_STR-EXKEY sy-vline 
WA_COMPPRT_STR-FHKTX sy-vline 
WA_COMPPRT_STR-AENNR sy-vline      INTO ld_text SEPARATED BY SPACE.

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