ABAP Select data from SAP table COMP_DAT into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM COMP_DAT
*  INTO TABLE @DATA(IT_COMP_DAT2).
*--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_COMP_DAT INDEX 1 INTO DATA(WA_COMP_DAT2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<COMP_DAT>-KDAUF1 = 1.
<COMP_DAT>-KDPOS1 = 1.
<COMP_DAT>-KDAUF2 = 1.
<COMP_DAT>-KDPOS2 = 1.
<COMP_DAT>-AUFNR1 = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_COMP_DAT-AUFNR2, sy-vline,
  WA_COMP_DAT-MATNR1, sy-vline,
  WA_COMP_DAT-MATNR2, sy-vline,
  WA_COMP_DAT-AUFLD1, sy-vline,
  WA_COMP_DAT-AUFLD2, sy-vline,
  WA_COMP_DAT-WERKS1, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_COMP_DAT 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_COMP_DAT 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_COMP_DAT INTO WA_COMP_DAT.


*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 KDAUF1
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_COMP_DAT-KDAUF1
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_COMP_DAT-KDAUF1.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field KDAUF2
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_COMP_DAT-KDAUF2
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_COMP_DAT-KDAUF2.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field AUFNR1
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_COMP_DAT-AUFNR1
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_COMP_DAT-AUFNR1.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field AUFNR2
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_COMP_DAT-AUFNR2
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_COMP_DAT-AUFNR2.
WRITE:/ 'New Value:', ld_input.

*Conversion exit MATN1, internal->external for field MATNR1
CALL FUNCTION 'CONVERSION_EXIT_MATN1_OUTPUT'
  EXPORTING
    input =                      WA_COMP_DAT-MATNR1
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_COMP_DAT-MATNR1.
WRITE:/ 'New Value:', ld_input.

*Conversion exit MATN1, internal->external for field MATNR2
CALL FUNCTION 'CONVERSION_EXIT_MATN1_OUTPUT'
  EXPORTING
    input =                      WA_COMP_DAT-MATNR2
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_COMP_DAT-MATNR2.
WRITE:/ 'New Value:', ld_input.

*Conversion exit CUNIT, internal->external for field MEINS
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_COMP_DAT-MEINS
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_COMP_DAT-MEINS.
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_COMP_DAT_STR, 
KDAUF1 TYPE STRING,
KDPOS1 TYPE STRING,
KDAUF2 TYPE STRING,
KDPOS2 TYPE STRING,
AUFNR1 TYPE STRING,
AUFNR2 TYPE STRING,
MATNR1 TYPE STRING,
MATNR2 TYPE STRING,
AUFLD1 TYPE STRING,
AUFLD2 TYPE STRING,
WERKS1 TYPE STRING,
WERKS2 TYPE STRING,
AUART TYPE STRING,
PROFID TYPE STRING,
ARTTEXT TYPE STRING,
PRFTEXT TYPE STRING,
MENGE TYPE STRING,
MEINS TYPE STRING,
FLG_COMP TYPE STRING,
FLG_SIM1 TYPE STRING,
FLG_SIM2 TYPE STRING,END OF T_EKKO_STR.
DATA: WA_COMP_DAT_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_COMP_DAT_STR-KDAUF1 sy-vline 
WA_COMP_DAT_STR-KDPOS1 sy-vline 
WA_COMP_DAT_STR-KDAUF2 sy-vline 
WA_COMP_DAT_STR-KDPOS2 sy-vline 
WA_COMP_DAT_STR-AUFNR1 sy-vline 
WA_COMP_DAT_STR-AUFNR2 sy-vline 
WA_COMP_DAT_STR-MATNR1 sy-vline 
WA_COMP_DAT_STR-MATNR2 sy-vline 
WA_COMP_DAT_STR-AUFLD1 sy-vline 
WA_COMP_DAT_STR-AUFLD2 sy-vline 
WA_COMP_DAT_STR-WERKS1 sy-vline 
WA_COMP_DAT_STR-WERKS2 sy-vline 
WA_COMP_DAT_STR-AUART sy-vline 
WA_COMP_DAT_STR-PROFID sy-vline 
WA_COMP_DAT_STR-ARTTEXT sy-vline 
WA_COMP_DAT_STR-PRFTEXT sy-vline 
WA_COMP_DAT_STR-MENGE sy-vline 
WA_COMP_DAT_STR-MEINS sy-vline 
WA_COMP_DAT_STR-FLG_COMP sy-vline 
WA_COMP_DAT_STR-FLG_SIM1 sy-vline 
WA_COMP_DAT_STR-FLG_SIM2 sy-vline      INTO ld_text SEPARATED BY SPACE.

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