ABAP Select data from SAP table CDUNNINGENTRY into internal table

Get Example source ABAP code based on a different SAP table
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Below is a number of ABAP code snippets to demonstrate how to select data from SAP CDUNNINGENTRY 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 CDUNNINGENTRY. 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 CDUNNINGENTRY 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_CDUNNINGENTRY TYPE STANDARD TABLE OF CDUNNINGENTRY,
      WA_CDUNNINGENTRY TYPE CDUNNINGENTRY,
      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: <CDUNNINGENTRY> TYPE CDUNNINGENTRY.

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM CDUNNINGENTRY
*  INTO TABLE @DATA(IT_CDUNNINGENTRY2).
*--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_CDUNNINGENTRY INDEX 1 INTO DATA(WA_CDUNNINGENTRY2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<CDUNNINGENTRY>-MANDT = 1.
<CDUNNINGENTRY>-DUNNINGRUNDATE = 1.
<CDUNNINGENTRY>-DUNNINGRUN = 1.
<CDUNNINGENTRY>-FINANCIALACCOUNTTYPE = 1.
<CDUNNINGENTRY>-COMPANYCODE = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_CDUNNINGENTRY-CUSTOMER, sy-vline,
  WA_CDUNNINGENTRY-SUPPLIER, sy-vline,
  WA_CDUNNINGENTRY-ONETIMEACCTBANKACCOUNT, sy-vline,
  WA_CDUNNINGENTRY-CUSTOMERHEADOFFICE, sy-vline,
  WA_CDUNNINGENTRY-GROUPINGDUNNINGAREA, sy-vline,
  WA_CDUNNINGENTRY-GROUPINGDUNNINGLEVEL, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_CDUNNINGENTRY 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_CDUNNINGENTRY 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_CDUNNINGENTRY INTO WA_CDUNNINGENTRY.


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

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

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

*Conversion exit AC152, internal->external for field DUELINEITEMSTOTALINDUNCRCY
CALL FUNCTION 'CONVERSION_EXIT_AC152_OUTPUT'
  EXPORTING
    input =                      WA_CDUNNINGENTRY-DUELINEITEMSTOTALINDUNCRCY
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_CDUNNINGENTRY-DUELINEITEMSTOTALINDUNCRCY.
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_CDUNNINGENTRY_STR, 
MANDT TYPE STRING,
DUNNINGRUNDATE TYPE STRING,
DUNNINGRUN TYPE STRING,
FINANCIALACCOUNTTYPE TYPE STRING,
COMPANYCODE TYPE STRING,
CUSTOMER TYPE STRING,
SUPPLIER TYPE STRING,
ONETIMEACCTBANKACCOUNT TYPE STRING,
CUSTOMERHEADOFFICE TYPE STRING,
GROUPINGDUNNINGAREA TYPE STRING,
GROUPINGDUNNINGLEVEL TYPE STRING,
DUNNINGCLERK TYPE STRING,
COMPANYCODENAME TYPE STRING,
CUSTOMERNAME TYPE STRING,
ORGANIZATIONBPNAME1 TYPE STRING,
ORGANIZATIONBPNAME2 TYPE STRING,
SUPPLIERNAME TYPE STRING,
NAME TYPE STRING,
ADDITIONALNAME TYPE STRING,
DUNNINGPRINTDATE TYPE STRING,
DUNNINGDATE TYPE STRING,
LEGDUNNINGPROCEDUREON TYPE STRING,
DUNNINGPROCEDURE TYPE STRING,
DUELINEITEMSTOTALINDUNCRCY TYPE STRING,
DUNNINGCURRENCY TYPE STRING,
NMBROFPAGES TYPE STRING,
DUNNINGLEVEL TYPE STRING,
DUNNINGBLOCKINGREASON TYPE STRING,
FINANCIALACCOUNTTYPENAME TYPE STRING,
CUSTOMERSUPPLIERACCOUNT TYPE STRING,
CUSTOMERSUPPLIERACCOUNTNAME TYPE STRING,END OF T_EKKO_STR.
DATA: WA_CDUNNINGENTRY_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_CDUNNINGENTRY_STR-MANDT sy-vline 
WA_CDUNNINGENTRY_STR-DUNNINGRUNDATE sy-vline 
WA_CDUNNINGENTRY_STR-DUNNINGRUN sy-vline 
WA_CDUNNINGENTRY_STR-FINANCIALACCOUNTTYPE sy-vline 
WA_CDUNNINGENTRY_STR-COMPANYCODE sy-vline 
WA_CDUNNINGENTRY_STR-CUSTOMER sy-vline 
WA_CDUNNINGENTRY_STR-SUPPLIER sy-vline 
WA_CDUNNINGENTRY_STR-ONETIMEACCTBANKACCOUNT sy-vline 
WA_CDUNNINGENTRY_STR-CUSTOMERHEADOFFICE sy-vline 
WA_CDUNNINGENTRY_STR-GROUPINGDUNNINGAREA sy-vline 
WA_CDUNNINGENTRY_STR-GROUPINGDUNNINGLEVEL sy-vline 
WA_CDUNNINGENTRY_STR-DUNNINGCLERK sy-vline 
WA_CDUNNINGENTRY_STR-COMPANYCODENAME sy-vline 
WA_CDUNNINGENTRY_STR-CUSTOMERNAME sy-vline 
WA_CDUNNINGENTRY_STR-ORGANIZATIONBPNAME1 sy-vline 
WA_CDUNNINGENTRY_STR-ORGANIZATIONBPNAME2 sy-vline 
WA_CDUNNINGENTRY_STR-SUPPLIERNAME sy-vline 
WA_CDUNNINGENTRY_STR-NAME sy-vline 
WA_CDUNNINGENTRY_STR-ADDITIONALNAME sy-vline 
WA_CDUNNINGENTRY_STR-DUNNINGPRINTDATE sy-vline 
WA_CDUNNINGENTRY_STR-DUNNINGDATE sy-vline 
WA_CDUNNINGENTRY_STR-LEGDUNNINGPROCEDUREON sy-vline 
WA_CDUNNINGENTRY_STR-DUNNINGPROCEDURE sy-vline 
WA_CDUNNINGENTRY_STR-DUELINEITEMSTOTALINDUNCRCY sy-vline 
WA_CDUNNINGENTRY_STR-DUNNINGCURRENCY sy-vline 
WA_CDUNNINGENTRY_STR-NMBROFPAGES sy-vline 
WA_CDUNNINGENTRY_STR-DUNNINGLEVEL sy-vline 
WA_CDUNNINGENTRY_STR-DUNNINGBLOCKINGREASON sy-vline 
WA_CDUNNINGENTRY_STR-FINANCIALACCOUNTTYPENAME sy-vline 
WA_CDUNNINGENTRY_STR-CUSTOMERSUPPLIERACCOUNT sy-vline 
WA_CDUNNINGENTRY_STR-CUSTOMERSUPPLIERACCOUNTNAME sy-vline      INTO ld_text SEPARATED BY SPACE.

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