ABAP Select data from SAP table IALLWNCD into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM IALLWNCD
*  INTO TABLE @DATA(IT_IALLWNCD2).
*--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_IALLWNCD INDEX 1 INTO DATA(WA_IALLWNCD2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<IALLWNCD>-MANDT = 1.
<IALLWNCD>-ALLOWANCEDEFINITIONUUID = 1.
<IALLWNCD>-CREATEDBYUSER = 1.
<IALLWNCD>-CREATIONDATETIME = 1.
<IALLWNCD>-LASTCHANGEDBYUSER = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_IALLWNCD-LASTCHANGEDATETIME, sy-vline,
  WA_IALLWNCD-ALLOWANCEDEFINITIONGROUPUUID, sy-vline,
  WA_IALLWNCD-ALLOWANCEDEFINITIONID, sy-vline,
  WA_IALLWNCD-ALLWNCDEFMANUALREFILLISALLOWED, sy-vline,
  WA_IALLWNCD-ALLWNCDEFISUSEDINCONTRCREATION, sy-vline,
  WA_IALLWNCD-ALLWNCDEFFORCRTNBRFFUNCUUID, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_IALLWNCD 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_IALLWNCD 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_IALLWNCD INTO WA_IALLWNCD.


*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_IALLWNCD_STR, 
MANDT TYPE STRING,
ALLOWANCEDEFINITIONUUID TYPE STRING,
CREATEDBYUSER TYPE STRING,
CREATIONDATETIME TYPE STRING,
LASTCHANGEDBYUSER TYPE STRING,
LASTCHANGEDATETIME TYPE STRING,
ALLOWANCEDEFINITIONGROUPUUID TYPE STRING,
ALLOWANCEDEFINITIONID TYPE STRING,
ALLWNCDEFMANUALREFILLISALLOWED TYPE STRING,
ALLWNCDEFISUSEDINCONTRCREATION TYPE STRING,
ALLWNCDEFFORCRTNBRFFUNCUUID TYPE STRING,
ALLWNCDEFISUSEDINCONTRCHANGE TYPE STRING,
ALLWNCDEFFORCHGBRFFUNCUUID TYPE STRING,
ALLWNCDEFINITIONVALIDFROMDATE TYPE STRING,
ALLWNCDEFVALIDFROMDATETIME TYPE STRING,
ALLOWANCEDEFINITIONVALIDTODATE TYPE STRING,
ALLWNCDEFVALIDTODATETIME TYPE STRING,
ALLOWANCEDEFINITIONIDISCHECKED TYPE STRING,
ALLWNCDEFVALDFROMDATEISCHECKED TYPE STRING,
ALLWNCDEFVALIDTODATEISCHECKED TYPE STRING,END OF T_EKKO_STR.
DATA: WA_IALLWNCD_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_IALLWNCD_STR-MANDT sy-vline 
WA_IALLWNCD_STR-ALLOWANCEDEFINITIONUUID sy-vline 
WA_IALLWNCD_STR-CREATEDBYUSER sy-vline 
WA_IALLWNCD_STR-CREATIONDATETIME sy-vline 
WA_IALLWNCD_STR-LASTCHANGEDBYUSER sy-vline 
WA_IALLWNCD_STR-LASTCHANGEDATETIME sy-vline 
WA_IALLWNCD_STR-ALLOWANCEDEFINITIONGROUPUUID sy-vline 
WA_IALLWNCD_STR-ALLOWANCEDEFINITIONID sy-vline 
WA_IALLWNCD_STR-ALLWNCDEFMANUALREFILLISALLOWED sy-vline 
WA_IALLWNCD_STR-ALLWNCDEFISUSEDINCONTRCREATION sy-vline 
WA_IALLWNCD_STR-ALLWNCDEFFORCRTNBRFFUNCUUID sy-vline 
WA_IALLWNCD_STR-ALLWNCDEFISUSEDINCONTRCHANGE sy-vline 
WA_IALLWNCD_STR-ALLWNCDEFFORCHGBRFFUNCUUID sy-vline 
WA_IALLWNCD_STR-ALLWNCDEFINITIONVALIDFROMDATE sy-vline 
WA_IALLWNCD_STR-ALLWNCDEFVALIDFROMDATETIME sy-vline 
WA_IALLWNCD_STR-ALLOWANCEDEFINITIONVALIDTODATE sy-vline 
WA_IALLWNCD_STR-ALLWNCDEFVALIDTODATETIME sy-vline 
WA_IALLWNCD_STR-ALLOWANCEDEFINITIONIDISCHECKED sy-vline 
WA_IALLWNCD_STR-ALLWNCDEFVALDFROMDATEISCHECKED sy-vline 
WA_IALLWNCD_STR-ALLWNCDEFVALIDTODATEISCHECKED sy-vline      INTO ld_text SEPARATED BY SPACE.

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