ABAP Select data from SAP table ICADUNLEVEL into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM ICADUNLEVEL
*  INTO TABLE @DATA(IT_ICADUNLEVEL2).
*--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_ICADUNLEVEL INDEX 1 INTO DATA(WA_ICADUNLEVEL2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<ICADUNLEVEL>-MANDT = 1.
<ICADUNLEVEL>-CADUNNINGPROCEDURE = 1.
<ICADUNLEVEL>-CADUNNINGLEVEL = 1.
<ICADUNLEVEL>-CANUMBEROFDAYSINARREARS = 1.
<ICADUNLEVEL>-CADUNNINGFREQUENCYINDAYS = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_ICADUNLEVEL-CADAYSTOPAYMENTDEADLINE, sy-vline,
  WA_ICADUNLEVEL-CAALLITEMSAREPRINTED, sy-vline,
  WA_ICADUNLEVEL-CADUNNINGNOTICEISALWAYSCREATED, sy-vline,
  WA_ICADUNLEVEL-CACREDITWORTHINESSRATINGVALUE, sy-vline,
  WA_ICADUNLEVEL-CADUNNINGLEVELISOPTIONAL, sy-vline,
  WA_ICADUNLEVEL-CADUNNINGLEVELISONLYFORINTRSN, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_ICADUNLEVEL 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_ICADUNLEVEL 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_ICADUNLEVEL INTO WA_ICADUNLEVEL.


*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.
ENDFORM. 

*&---------------------------------------------------------------------*
*& Form process_as_string_field_values
*&---------------------------------------------------------------------*
FORM process_as_string_field_values CHANGING p_EKKO LIKE wa_EKKO.

TYPES: BEGIN OF T_ICADUNLEVEL_STR, 
MANDT TYPE STRING,
CADUNNINGPROCEDURE TYPE STRING,
CADUNNINGLEVEL TYPE STRING,
CANUMBEROFDAYSINARREARS TYPE STRING,
CADUNNINGFREQUENCYINDAYS TYPE STRING,
CADAYSTOPAYMENTDEADLINE TYPE STRING,
CAALLITEMSAREPRINTED TYPE STRING,
CADUNNINGNOTICEISALWAYSCREATED TYPE STRING,
CACREDITWORTHINESSRATINGVALUE TYPE STRING,
CADUNNINGLEVELISOPTIONAL TYPE STRING,
CADUNNINGLEVELISONLYFORINTRSN TYPE STRING,
CAINTERESTCODE TYPE STRING,
CAPOSTINGCODEFORDUNINTEREST TYPE STRING,
CAINTERESTISCALCULATED TYPE STRING,
CADUNNINGCHARGESSCHEMA TYPE STRING,
CADUNNINGLEVELCATEGORY TYPE STRING,
CADUNNINGLEVELSETTINGCODE TYPE STRING,
CANUMBEROFDAYSINARREARSEXT TYPE STRING,
CADUNNINGFREQUENCYINDAYSEXT TYPE STRING,
CAONLYITMSOFLASTDUNLVLAREALLWD TYPE STRING,
CADUNNINGRECIPIENTDETNCODE TYPE STRING,
CAINTRSTISCALCULATEDBFRCHARGES TYPE STRING,
CADAYSBEFOREDUEDATEFORREMINDER TYPE STRING,
CAMINIMALPCTOFAMOUNTSTILLOPEN TYPE STRING,
CAINTRSTANDCHARGEISADDEDTOHIST TYPE STRING,
CADUNNINGSUCCESSCANBEEVALUATED TYPE STRING,END OF T_EKKO_STR.
DATA: WA_ICADUNLEVEL_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_ICADUNLEVEL_STR-MANDT sy-vline 
WA_ICADUNLEVEL_STR-CADUNNINGPROCEDURE sy-vline 
WA_ICADUNLEVEL_STR-CADUNNINGLEVEL sy-vline 
WA_ICADUNLEVEL_STR-CANUMBEROFDAYSINARREARS sy-vline 
WA_ICADUNLEVEL_STR-CADUNNINGFREQUENCYINDAYS sy-vline 
WA_ICADUNLEVEL_STR-CADAYSTOPAYMENTDEADLINE sy-vline 
WA_ICADUNLEVEL_STR-CAALLITEMSAREPRINTED sy-vline 
WA_ICADUNLEVEL_STR-CADUNNINGNOTICEISALWAYSCREATED sy-vline 
WA_ICADUNLEVEL_STR-CACREDITWORTHINESSRATINGVALUE sy-vline 
WA_ICADUNLEVEL_STR-CADUNNINGLEVELISOPTIONAL sy-vline 
WA_ICADUNLEVEL_STR-CADUNNINGLEVELISONLYFORINTRSN sy-vline 
WA_ICADUNLEVEL_STR-CAINTERESTCODE sy-vline 
WA_ICADUNLEVEL_STR-CAPOSTINGCODEFORDUNINTEREST sy-vline 
WA_ICADUNLEVEL_STR-CAINTERESTISCALCULATED sy-vline 
WA_ICADUNLEVEL_STR-CADUNNINGCHARGESSCHEMA sy-vline 
WA_ICADUNLEVEL_STR-CADUNNINGLEVELCATEGORY sy-vline 
WA_ICADUNLEVEL_STR-CADUNNINGLEVELSETTINGCODE sy-vline 
WA_ICADUNLEVEL_STR-CANUMBEROFDAYSINARREARSEXT sy-vline 
WA_ICADUNLEVEL_STR-CADUNNINGFREQUENCYINDAYSEXT sy-vline 
WA_ICADUNLEVEL_STR-CAONLYITMSOFLASTDUNLVLAREALLWD sy-vline 
WA_ICADUNLEVEL_STR-CADUNNINGRECIPIENTDETNCODE sy-vline 
WA_ICADUNLEVEL_STR-CAINTRSTISCALCULATEDBFRCHARGES sy-vline 
WA_ICADUNLEVEL_STR-CADAYSBEFOREDUEDATEFORREMINDER sy-vline 
WA_ICADUNLEVEL_STR-CAMINIMALPCTOFAMOUNTSTILLOPEN sy-vline 
WA_ICADUNLEVEL_STR-CAINTRSTANDCHARGEISADDEDTOHIST sy-vline 
WA_ICADUNLEVEL_STR-CADUNNINGSUCCESSCANBEEVALUATED sy-vline      INTO ld_text SEPARATED BY SPACE.

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