ABAP Select data from SAP table IWITEMTAB into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM IWITEMTAB
*  INTO TABLE @DATA(IT_IWITEMTAB2).
*--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_IWITEMTAB INDEX 1 INTO DATA(WA_IWITEMTAB2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<IWITEMTAB>-BOX = 1.
<IWITEMTAB>-CLASS = 1.
<IWITEMTAB>-OBJID = 1.
<IWITEMTAB>-FOLDERID = 1.
<IWITEMTAB>-IOTYPE = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_IWITEMTAB-LANGUAGE, sy-vline,
  WA_IWITEMTAB-ORIGLANGU, sy-vline,
  WA_IWITEMTAB-COUNTRY, sy-vline,
  WA_IWITEMTAB-STATUS, sy-vline,
  WA_IWITEMTAB-T_STATUS, sy-vline,
  WA_IWITEMTAB-PRIORITY, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_IWITEMTAB 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_IWITEMTAB 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_IWITEMTAB INTO WA_IWITEMTAB.


*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 ISOLA, internal->external for field LANGUAGE
CALL FUNCTION 'CONVERSION_EXIT_ISOLA_OUTPUT'
  EXPORTING
    input =                      WA_IWITEMTAB-LANGUAGE
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_IWITEMTAB-LANGUAGE.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ISOLA, internal->external for field ORIGLANGU
CALL FUNCTION 'CONVERSION_EXIT_ISOLA_OUTPUT'
  EXPORTING
    input =                      WA_IWITEMTAB-ORIGLANGU
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_IWITEMTAB-ORIGLANGU.
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_IWITEMTAB_STR, 
BOX TYPE STRING,
CLASS TYPE STRING,
OBJID TYPE STRING,
FOLDERID TYPE STRING,
IOTYPE TYPE STRING,
LANGUAGE TYPE STRING,
ORIGLANGU TYPE STRING,
COUNTRY TYPE STRING,
STATUS TYPE STRING,
T_STATUS TYPE STRING,
PRIORITY TYPE STRING,
CHOUT_INFO TYPE STRING,
COLOR_INFO TYPE STRING,
TITLE TYPE STRING,
TECH_NAME TYPE STRING,
CLASS_TXT TYPE STRING,
TYPE_TXT TYPE STRING,
RELEASE TYPE STRING,
LANGU_TXT TYPE STRING,
ORIG_LANGT TYPE STRING,
EXT_ID TYPE STRING,
COUNTY_TXT TYPE STRING,
RESPONSBLE TYPE STRING,
STATUS_TXT TYPE STRING,
T_STAT_TXT TYPE STRING,
PRIORITY_T TYPE STRING,
CREATED_BY TYPE STRING,
CREATED_AT TYPE STRING,
CHANGED_BY TYPE STRING,
CHANGED_AT TYPE STRING,
EXPORT_FLG TYPE STRING,
EXPORT_USR TYPE STRING,
NO_WORDS TYPE STRING,
NO_LINES TYPE STRING,
NO_PARAGR TYPE STRING,
NO_PAGES TYPE STRING,
CONV_FROM TYPE STRING,
CONV_TO TYPE STRING,
STR_LEVEL TYPE STRING,
NEVER_TRANSLATE TYPE STRING,
TRANS_STATE TYPE STRING,
MSG_EXISTS TYPE STRING,
COLOR_MSG TYPE STRING,
DELIVERY TYPE STRING,END OF T_EKKO_STR.
DATA: WA_IWITEMTAB_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_IWITEMTAB_STR-BOX sy-vline 
WA_IWITEMTAB_STR-CLASS sy-vline 
WA_IWITEMTAB_STR-OBJID sy-vline 
WA_IWITEMTAB_STR-FOLDERID sy-vline 
WA_IWITEMTAB_STR-IOTYPE sy-vline 
WA_IWITEMTAB_STR-LANGUAGE sy-vline 
WA_IWITEMTAB_STR-ORIGLANGU sy-vline 
WA_IWITEMTAB_STR-COUNTRY sy-vline 
WA_IWITEMTAB_STR-STATUS sy-vline 
WA_IWITEMTAB_STR-T_STATUS sy-vline 
WA_IWITEMTAB_STR-PRIORITY sy-vline 
WA_IWITEMTAB_STR-CHOUT_INFO sy-vline 
WA_IWITEMTAB_STR-COLOR_INFO sy-vline 
WA_IWITEMTAB_STR-TITLE sy-vline 
WA_IWITEMTAB_STR-TECH_NAME sy-vline 
WA_IWITEMTAB_STR-CLASS_TXT sy-vline 
WA_IWITEMTAB_STR-TYPE_TXT sy-vline 
WA_IWITEMTAB_STR-RELEASE sy-vline 
WA_IWITEMTAB_STR-LANGU_TXT sy-vline 
WA_IWITEMTAB_STR-ORIG_LANGT sy-vline 
WA_IWITEMTAB_STR-EXT_ID sy-vline 
WA_IWITEMTAB_STR-COUNTY_TXT sy-vline 
WA_IWITEMTAB_STR-RESPONSBLE sy-vline 
WA_IWITEMTAB_STR-STATUS_TXT sy-vline 
WA_IWITEMTAB_STR-T_STAT_TXT sy-vline 
WA_IWITEMTAB_STR-PRIORITY_T sy-vline 
WA_IWITEMTAB_STR-CREATED_BY sy-vline 
WA_IWITEMTAB_STR-CREATED_AT sy-vline 
WA_IWITEMTAB_STR-CHANGED_BY sy-vline 
WA_IWITEMTAB_STR-CHANGED_AT sy-vline 
WA_IWITEMTAB_STR-EXPORT_FLG sy-vline 
WA_IWITEMTAB_STR-EXPORT_USR sy-vline 
WA_IWITEMTAB_STR-NO_WORDS sy-vline 
WA_IWITEMTAB_STR-NO_LINES sy-vline 
WA_IWITEMTAB_STR-NO_PARAGR sy-vline 
WA_IWITEMTAB_STR-NO_PAGES sy-vline 
WA_IWITEMTAB_STR-CONV_FROM sy-vline 
WA_IWITEMTAB_STR-CONV_TO sy-vline 
WA_IWITEMTAB_STR-STR_LEVEL sy-vline 
WA_IWITEMTAB_STR-NEVER_TRANSLATE sy-vline 
WA_IWITEMTAB_STR-TRANS_STATE sy-vline 
WA_IWITEMTAB_STR-MSG_EXISTS sy-vline 
WA_IWITEMTAB_STR-COLOR_MSG sy-vline 
WA_IWITEMTAB_STR-DELIVERY sy-vline      INTO ld_text SEPARATED BY SPACE.

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