ABAP Select data from SAP table /IWWRK/S_WF_TASK_ROOT_DATA into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP /IWWRK/S_WF_TASK_ROOT_DATA 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 /IWWRK/S_WF_TASK_ROOT_DATA. 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 /IWWRK/S_WF_TASK_ROOT_DATA 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_/IWWRK/S_WF_TASK_ROOT_DATA TYPE STANDARD TABLE OF /IWWRK/S_WF_TASK_ROOT_DATA,
      WA_/IWWRK/S_WF_TASK_ROOT_DATA TYPE /IWWRK/S_WF_TASK_ROOT_DATA,
      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: </IWWRK/S_WF_TASK_ROOT_DATA> TYPE /IWWRK/S_WF_TASK_ROOT_DATA.

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM /IWWRK/S_WF_TASK_ROOT_DATA
*  INTO TABLE @DATA(IT_/IWWRK/S_WF_TASK_ROOT_DATA2).
*--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_/IWWRK/S_WF_TASK_ROOT_DATA INDEX 1 INTO DATA(WA_/IWWRK/S_WF_TASK_ROOT_DATA2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
</IWWRK/S_WF_TASK_ROOT_DATA>-WORKITEM_ID = 1.
</IWWRK/S_WF_TASK_ROOT_DATA>-SUBJECT = 1.
</IWWRK/S_WF_TASK_ROOT_DATA>-LANGU = 1.
</IWWRK/S_WF_TASK_ROOT_DATA>-LANGU_TEXT = 1.
</IWWRK/S_WF_TASK_ROOT_DATA>-TYPE = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_/IWWRK/S_WF_TASK_ROOT_DATA-TYPE_TEXT, sy-vline,
  WA_/IWWRK/S_WF_TASK_ROOT_DATA-TASK_ID, sy-vline,
  WA_/IWWRK/S_WF_TASK_ROOT_DATA-TASK_TEXT, sy-vline,
  WA_/IWWRK/S_WF_TASK_ROOT_DATA-PRIORITY, sy-vline,
  WA_/IWWRK/S_WF_TASK_ROOT_DATA-PRIO_TEXT, sy-vline,
  WA_/IWWRK/S_WF_TASK_ROOT_DATA-STATUS, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_/IWWRK/S_WF_TASK_ROOT_DATA 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_/IWWRK/S_WF_TASK_ROOT_DATA 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_/IWWRK/S_WF_TASK_ROOT_DATA INTO WA_/IWWRK/S_WF_TASK_ROOT_DATA.


*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 LANGU
CALL FUNCTION 'CONVERSION_EXIT_ISOLA_OUTPUT'
  EXPORTING
    input =                      WA_/IWWRK/S_WF_TASK_ROOT_DATA-LANGU
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_/IWWRK/S_WF_TASK_ROOT_DATA-LANGU.
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_/IWWRK/S_WF_TASK_ROOT_DATA_STR, 
WORKITEM_ID TYPE STRING,
SUBJECT TYPE STRING,
LANGU TYPE STRING,
LANGU_TEXT TYPE STRING,
TYPE TYPE STRING,
TYPE_TEXT TYPE STRING,
TASK_ID TYPE STRING,
TASK_TEXT TYPE STRING,
PRIORITY TYPE STRING,
PRIO_TEXT TYPE STRING,
STATUS TYPE STRING,
STATUS_TEXT TYPE STRING,
CREATION_DATE TYPE STRING,
CREATION_TIME TYPE STRING,
LATEST_SD TYPE STRING,
LATEST_ST TYPE STRING,
LATEST_ED TYPE STRING,
LATEST_ET TYPE STRING,
ACT_AGENT TYPE STRING,
ACT_AGENT_NAME TYPE STRING,
TOP_WI_ID TYPE STRING,
FORW_BY TYPE STRING,
FORW_BY_NAME TYPE STRING,
NOTE_COUNT TYPE STRING,
WI_CREATOR TYPE STRING,
WORKFLOW_ID TYPE STRING,
STEP_ID TYPE STRING,END OF T_EKKO_STR.
DATA: WA_/IWWRK/S_WF_TASK_ROOT_DATA_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_/IWWRK/S_WF_TASK_ROOT_DATA_STR-WORKITEM_ID sy-vline 
WA_/IWWRK/S_WF_TASK_ROOT_DATA_STR-SUBJECT sy-vline 
WA_/IWWRK/S_WF_TASK_ROOT_DATA_STR-LANGU sy-vline 
WA_/IWWRK/S_WF_TASK_ROOT_DATA_STR-LANGU_TEXT sy-vline 
WA_/IWWRK/S_WF_TASK_ROOT_DATA_STR-TYPE sy-vline 
WA_/IWWRK/S_WF_TASK_ROOT_DATA_STR-TYPE_TEXT sy-vline 
WA_/IWWRK/S_WF_TASK_ROOT_DATA_STR-TASK_ID sy-vline 
WA_/IWWRK/S_WF_TASK_ROOT_DATA_STR-TASK_TEXT sy-vline 
WA_/IWWRK/S_WF_TASK_ROOT_DATA_STR-PRIORITY sy-vline 
WA_/IWWRK/S_WF_TASK_ROOT_DATA_STR-PRIO_TEXT sy-vline 
WA_/IWWRK/S_WF_TASK_ROOT_DATA_STR-STATUS sy-vline 
WA_/IWWRK/S_WF_TASK_ROOT_DATA_STR-STATUS_TEXT sy-vline 
WA_/IWWRK/S_WF_TASK_ROOT_DATA_STR-CREATION_DATE sy-vline 
WA_/IWWRK/S_WF_TASK_ROOT_DATA_STR-CREATION_TIME sy-vline 
WA_/IWWRK/S_WF_TASK_ROOT_DATA_STR-LATEST_SD sy-vline 
WA_/IWWRK/S_WF_TASK_ROOT_DATA_STR-LATEST_ST sy-vline 
WA_/IWWRK/S_WF_TASK_ROOT_DATA_STR-LATEST_ED sy-vline 
WA_/IWWRK/S_WF_TASK_ROOT_DATA_STR-LATEST_ET sy-vline 
WA_/IWWRK/S_WF_TASK_ROOT_DATA_STR-ACT_AGENT sy-vline 
WA_/IWWRK/S_WF_TASK_ROOT_DATA_STR-ACT_AGENT_NAME sy-vline 
WA_/IWWRK/S_WF_TASK_ROOT_DATA_STR-TOP_WI_ID sy-vline 
WA_/IWWRK/S_WF_TASK_ROOT_DATA_STR-FORW_BY sy-vline 
WA_/IWWRK/S_WF_TASK_ROOT_DATA_STR-FORW_BY_NAME sy-vline 
WA_/IWWRK/S_WF_TASK_ROOT_DATA_STR-NOTE_COUNT sy-vline 
WA_/IWWRK/S_WF_TASK_ROOT_DATA_STR-WI_CREATOR sy-vline 
WA_/IWWRK/S_WF_TASK_ROOT_DATA_STR-WORKFLOW_ID sy-vline 
WA_/IWWRK/S_WF_TASK_ROOT_DATA_STR-STEP_ID sy-vline      INTO ld_text SEPARATED BY SPACE.

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