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

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM /ACCGO/CAS_S_CAH_NK
*  INTO TABLE @DATA(IT_/ACCGO/CAS_S_CAH_NK2).
*--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/CAS_S_CAH_NK INDEX 1 INTO DATA(WA_/ACCGO/CAS_S_CAH_NK2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
</ACCGO/CAS_S_CAH_NK>-DOC_TYPE = 1.
</ACCGO/CAS_S_CAH_NK>-ADTYP = 1.
</ACCGO/CAS_S_CAH_NK>-BLDAT = 1.
</ACCGO/CAS_S_CAH_NK>-BUDAT = 1.
</ACCGO/CAS_S_CAH_NK>-PODAT = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_/ACCGO/CAS_S_CAH_NK-POTIM, sy-vline,
  WA_/ACCGO/CAS_S_CAH_NK-REF_DOC_TYPE, sy-vline,
  WA_/ACCGO/CAS_S_CAH_NK-REF_DOC, sy-vline,
  WA_/ACCGO/CAS_S_CAH_NK-MJAHR, sy-vline,
  WA_/ACCGO/CAS_S_CAH_NK-REF_APP_DOC, sy-vline,
  WA_/ACCGO/CAS_S_CAH_NK-REF_APP_DOC_TYP, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_/ACCGO/CAS_S_CAH_NK 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/CAS_S_CAH_NK 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/CAS_S_CAH_NK INTO WA_/ACCGO/CAS_S_CAH_NK.


*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 REF_DOC
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_/ACCGO/CAS_S_CAH_NK-REF_DOC
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_/ACCGO/CAS_S_CAH_NK-REF_DOC.
WRITE:/ 'New Value:', ld_input.

*Conversion exit GJAHR, internal->external for field MJAHR
CALL FUNCTION 'CONVERSION_EXIT_GJAHR_OUTPUT'
  EXPORTING
    input =                      WA_/ACCGO/CAS_S_CAH_NK-MJAHR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_/ACCGO/CAS_S_CAH_NK-MJAHR.
WRITE:/ 'New Value:', ld_input.

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

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

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

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

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

*Conversion exit ALPHA, internal->external for field EBELN
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_/ACCGO/CAS_S_CAH_NK-EBELN
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_/ACCGO/CAS_S_CAH_NK-EBELN.
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/CAS_S_CAH_NK_STR, 
DOC_TYPE TYPE STRING,
ADTYP TYPE STRING,
BLDAT TYPE STRING,
BUDAT TYPE STRING,
PODAT TYPE STRING,
POTIM TYPE STRING,
REF_DOC_TYPE TYPE STRING,
REF_DOC TYPE STRING,
MJAHR TYPE STRING,
REF_APP_DOC TYPE STRING,
REF_APP_DOC_TYP TYPE STRING,
REF_ADTYP TYPE STRING,
STRING_CIRCLE TYPE STRING,
STATUS TYPE STRING,
NO_PH_REC TYPE STRING,
NFNUM TYPE STRING,
NFVALID TYPE STRING,
STKZN TYPE STRING,
LFSNR TYPE STRING,
TROP TYPE STRING,
SPLIT TYPE STRING,
NFFRE TYPE STRING,
FUTURE TYPE STRING,
TROP_EARLY_INVOICE TYPE STRING,
BELNR TYPE STRING,
GJAHR TYPE STRING,
COMMINGLED TYPE STRING,
DNTOT TYPE STRING,
NFR_CURR TYPE STRING,
DNQTY TYPE STRING,
DNUOM TYPE STRING,
J_1BEXBASE TYPE STRING,
BASE_CURR TYPE STRING,
MWSKZ TYPE STRING,
REF_TC TYPE STRING,
REF_IT TYPE STRING,
EBELN TYPE STRING,
EBELP TYPE STRING,
DELIVERY_NFVALID TYPE STRING,END OF T_EKKO_STR.
DATA: WA_/ACCGO/CAS_S_CAH_NK_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/CAS_S_CAH_NK_STR-DOC_TYPE sy-vline 
WA_/ACCGO/CAS_S_CAH_NK_STR-ADTYP sy-vline 
WA_/ACCGO/CAS_S_CAH_NK_STR-BLDAT sy-vline 
WA_/ACCGO/CAS_S_CAH_NK_STR-BUDAT sy-vline 
WA_/ACCGO/CAS_S_CAH_NK_STR-PODAT sy-vline 
WA_/ACCGO/CAS_S_CAH_NK_STR-POTIM sy-vline 
WA_/ACCGO/CAS_S_CAH_NK_STR-REF_DOC_TYPE sy-vline 
WA_/ACCGO/CAS_S_CAH_NK_STR-REF_DOC sy-vline 
WA_/ACCGO/CAS_S_CAH_NK_STR-MJAHR sy-vline 
WA_/ACCGO/CAS_S_CAH_NK_STR-REF_APP_DOC sy-vline 
WA_/ACCGO/CAS_S_CAH_NK_STR-REF_APP_DOC_TYP sy-vline 
WA_/ACCGO/CAS_S_CAH_NK_STR-REF_ADTYP sy-vline 
WA_/ACCGO/CAS_S_CAH_NK_STR-STRING_CIRCLE sy-vline 
WA_/ACCGO/CAS_S_CAH_NK_STR-STATUS sy-vline 
WA_/ACCGO/CAS_S_CAH_NK_STR-NO_PH_REC sy-vline 
WA_/ACCGO/CAS_S_CAH_NK_STR-NFNUM sy-vline 
WA_/ACCGO/CAS_S_CAH_NK_STR-NFVALID sy-vline 
WA_/ACCGO/CAS_S_CAH_NK_STR-STKZN sy-vline 
WA_/ACCGO/CAS_S_CAH_NK_STR-LFSNR sy-vline 
WA_/ACCGO/CAS_S_CAH_NK_STR-TROP sy-vline 
WA_/ACCGO/CAS_S_CAH_NK_STR-SPLIT sy-vline 
WA_/ACCGO/CAS_S_CAH_NK_STR-NFFRE sy-vline 
WA_/ACCGO/CAS_S_CAH_NK_STR-FUTURE sy-vline 
WA_/ACCGO/CAS_S_CAH_NK_STR-TROP_EARLY_INVOICE sy-vline 
WA_/ACCGO/CAS_S_CAH_NK_STR-BELNR sy-vline 
WA_/ACCGO/CAS_S_CAH_NK_STR-GJAHR sy-vline 
WA_/ACCGO/CAS_S_CAH_NK_STR-COMMINGLED sy-vline 
WA_/ACCGO/CAS_S_CAH_NK_STR-DNTOT sy-vline 
WA_/ACCGO/CAS_S_CAH_NK_STR-NFR_CURR sy-vline 
WA_/ACCGO/CAS_S_CAH_NK_STR-DNQTY sy-vline 
WA_/ACCGO/CAS_S_CAH_NK_STR-DNUOM sy-vline 
WA_/ACCGO/CAS_S_CAH_NK_STR-J_1BEXBASE sy-vline 
WA_/ACCGO/CAS_S_CAH_NK_STR-BASE_CURR sy-vline 
WA_/ACCGO/CAS_S_CAH_NK_STR-MWSKZ sy-vline 
WA_/ACCGO/CAS_S_CAH_NK_STR-REF_TC sy-vline 
WA_/ACCGO/CAS_S_CAH_NK_STR-REF_IT sy-vline 
WA_/ACCGO/CAS_S_CAH_NK_STR-EBELN sy-vline 
WA_/ACCGO/CAS_S_CAH_NK_STR-EBELP sy-vline 
WA_/ACCGO/CAS_S_CAH_NK_STR-DELIVERY_NFVALID sy-vline      INTO ld_text SEPARATED BY SPACE.

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