ABAP Select data from SAP table /ACCGO/T_KOMP into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP /ACCGO/T_KOMP 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 /ACCGO/T_KOMP. 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 /ACCGO/T_KOMP 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_/ACCGO/T_KOMP TYPE STANDARD TABLE OF /ACCGO/T_KOMP,
      WA_/ACCGO/T_KOMP TYPE /ACCGO/T_KOMP,
      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: </ACCGO/T_KOMP> TYPE /ACCGO/T_KOMP.

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

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM /ACCGO/T_KOMP
  INTO TABLE IT_/ACCGO/T_KOMP.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM /ACCGO/T_KOMP
*  INTO TABLE @DATA(IT_/ACCGO/T_KOMP2).
*--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_/ACCGO/T_KOMP INDEX 1 INTO DATA(WA_/ACCGO/T_KOMP2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_/ACCGO/T_KOMP ASSIGNING </ACCGO/T_KOMP>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
</ACCGO/T_KOMP>-STL_HEADER_MANDT = 1.
</ACCGO/T_KOMP>-STL_HEADER_GUID = 1.
</ACCGO/T_KOMP>-STL_KPOSN = 1.
</ACCGO/T_KOMP>-KPOSN = 1.
</ACCGO/T_KOMP>-MATNR = 1.

ENDLOOP.

LOOP AT IT_/ACCGO/T_KOMP INTO WA_/ACCGO/T_KOMP.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_/ACCGO/T_KOMP-WERKS, sy-vline,
  WA_/ACCGO/T_KOMP-WKREG, sy-vline,
  WA_/ACCGO/T_KOMP-BWKEY, sy-vline,
  WA_/ACCGO/T_KOMP-PMATN, sy-vline,
  WA_/ACCGO/T_KOMP-MEINS, sy-vline,
  WA_/ACCGO/T_KOMP-MGLME, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_/ACCGO/T_KOMP 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_/ACCGO/T_KOMP 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_/ACCGO/T_KOMP INTO WA_/ACCGO/T_KOMP.


*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 MATN1, internal->external for field MATNR
CALL FUNCTION 'CONVERSION_EXIT_MATN1_OUTPUT'
  EXPORTING
    input =                      WA_/ACCGO/T_KOMP-MATNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_/ACCGO/T_KOMP-MATNR.
WRITE:/ 'New Value:', ld_input.

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

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

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

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

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

*Conversion exit CUNIT, internal->external for field KMEIN
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_/ACCGO/T_KOMP-KMEIN
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_/ACCGO/T_KOMP-KMEIN.
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_/ACCGO/T_KOMP_STR, 
STL_HEADER_MANDT TYPE STRING,
STL_HEADER_GUID TYPE STRING,
STL_KPOSN TYPE STRING,
KPOSN TYPE STRING,
MATNR TYPE STRING,
WERKS TYPE STRING,
WKREG TYPE STRING,
BWKEY TYPE STRING,
PMATN TYPE STRING,
MEINS TYPE STRING,
MGLME TYPE STRING,
LAGME TYPE STRING,
MGAME TYPE STRING,
VRKME TYPE STRING,
UMVKZ TYPE STRING,
UMVKN TYPE STRING,
BRGEW TYPE STRING,
NTGEW TYPE STRING,
GEWEI TYPE STRING,
PRSFD TYPE STRING,
ANZ_TAGE TYPE STRING,
ANZ_MONATE TYPE STRING,
ANZ_WOCHEN TYPE STRING,
ANZ_JAHRE TYPE STRING,
STF_TAGE TYPE STRING,
STF_MONATE TYPE STRING,
STF_WOCHEN TYPE STRING,
STF_JAHRE TYPE STRING,
EFFWR TYPE STRING,
NETWR TYPE STRING,
NETPR TYPE STRING,
KPEIN TYPE STRING,
KMEIN TYPE STRING,
KURSK_DAT TYPE STRING,
FXMSG TYPE STRING,
PRSOK TYPE STRING,
KZBZG TYPE STRING,
GEAEND TYPE STRING,END OF T_EKKO_STR.
DATA: WA_/ACCGO/T_KOMP_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_/ACCGO/T_KOMP_STR-STL_HEADER_MANDT sy-vline 
WA_/ACCGO/T_KOMP_STR-STL_HEADER_GUID sy-vline 
WA_/ACCGO/T_KOMP_STR-STL_KPOSN sy-vline 
WA_/ACCGO/T_KOMP_STR-KPOSN sy-vline 
WA_/ACCGO/T_KOMP_STR-MATNR sy-vline 
WA_/ACCGO/T_KOMP_STR-WERKS sy-vline 
WA_/ACCGO/T_KOMP_STR-WKREG sy-vline 
WA_/ACCGO/T_KOMP_STR-BWKEY sy-vline 
WA_/ACCGO/T_KOMP_STR-PMATN sy-vline 
WA_/ACCGO/T_KOMP_STR-MEINS sy-vline 
WA_/ACCGO/T_KOMP_STR-MGLME sy-vline 
WA_/ACCGO/T_KOMP_STR-LAGME sy-vline 
WA_/ACCGO/T_KOMP_STR-MGAME sy-vline 
WA_/ACCGO/T_KOMP_STR-VRKME sy-vline 
WA_/ACCGO/T_KOMP_STR-UMVKZ sy-vline 
WA_/ACCGO/T_KOMP_STR-UMVKN sy-vline 
WA_/ACCGO/T_KOMP_STR-BRGEW sy-vline 
WA_/ACCGO/T_KOMP_STR-NTGEW sy-vline 
WA_/ACCGO/T_KOMP_STR-GEWEI sy-vline 
WA_/ACCGO/T_KOMP_STR-PRSFD sy-vline 
WA_/ACCGO/T_KOMP_STR-ANZ_TAGE sy-vline 
WA_/ACCGO/T_KOMP_STR-ANZ_MONATE sy-vline 
WA_/ACCGO/T_KOMP_STR-ANZ_WOCHEN sy-vline 
WA_/ACCGO/T_KOMP_STR-ANZ_JAHRE sy-vline 
WA_/ACCGO/T_KOMP_STR-STF_TAGE sy-vline 
WA_/ACCGO/T_KOMP_STR-STF_MONATE sy-vline 
WA_/ACCGO/T_KOMP_STR-STF_WOCHEN sy-vline 
WA_/ACCGO/T_KOMP_STR-STF_JAHRE sy-vline 
WA_/ACCGO/T_KOMP_STR-EFFWR sy-vline 
WA_/ACCGO/T_KOMP_STR-NETWR sy-vline 
WA_/ACCGO/T_KOMP_STR-NETPR sy-vline 
WA_/ACCGO/T_KOMP_STR-KPEIN sy-vline 
WA_/ACCGO/T_KOMP_STR-KMEIN sy-vline 
WA_/ACCGO/T_KOMP_STR-KURSK_DAT sy-vline 
WA_/ACCGO/T_KOMP_STR-FXMSG sy-vline 
WA_/ACCGO/T_KOMP_STR-PRSOK sy-vline 
WA_/ACCGO/T_KOMP_STR-KZBZG sy-vline 
WA_/ACCGO/T_KOMP_STR-GEAEND sy-vline      INTO ld_text SEPARATED BY SPACE.

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