ABAP Select data from SAP table WFDSS_UI_ASSIGNMENT_MAINTAIN into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM WFDSS_UI_ASSIGNMENT_MAINTAIN
*  INTO TABLE @DATA(IT_WFDSS_UI_ASSIGNMENT_MAINTAIN2).
*--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_WFDSS_UI_ASSIGNMENT_MAINTAIN INDEX 1 INTO DATA(WA_WFDSS_UI_ASSIGNMENT_MAINTAIN2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<WFDSS_UI_ASSIGNMENT_MAINTAIN>-RESOURCE_DESC = 1.
<WFDSS_UI_ASSIGNMENT_MAINTAIN>-DEMAND_DESC = 1.
<WFDSS_UI_ASSIGNMENT_MAINTAIN>-DEMAND_ID = 1.
<WFDSS_UI_ASSIGNMENT_MAINTAIN>-BEG_TMSTMP = 1.
<WFDSS_UI_ASSIGNMENT_MAINTAIN>-END_TMSTMP = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_WFDSS_UI_ASSIGNMENT_MAINTAIN-BEGIN_DATE, sy-vline,
  WA_WFDSS_UI_ASSIGNMENT_MAINTAIN-END_DATE, sy-vline,
  WA_WFDSS_UI_ASSIGNMENT_MAINTAIN-BEGIN_TIME, sy-vline,
  WA_WFDSS_UI_ASSIGNMENT_MAINTAIN-END_TIME, sy-vline,
  WA_WFDSS_UI_ASSIGNMENT_MAINTAIN-DURATION_IN_SEC, sy-vline,
  WA_WFDSS_UI_ASSIGNMENT_MAINTAIN-DURATION, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_WFDSS_UI_ASSIGNMENT_MAINTAIN 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_WFDSS_UI_ASSIGNMENT_MAINTAIN 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_WFDSS_UI_ASSIGNMENT_MAINTAIN INTO WA_WFDSS_UI_ASSIGNMENT_MAINTAIN.


*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 CUNIT, internal->external for field DURATION_UNIT
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_WFDSS_UI_ASSIGNMENT_MAINTAIN-DURATION_UNIT
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_WFDSS_UI_ASSIGNMENT_MAINTAIN-DURATION_UNIT.
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_WFDSS_UI_ASSIGNMENT_MAINTAIN_STR, 
RESOURCE_DESC TYPE STRING,
DEMAND_DESC TYPE STRING,
DEMAND_ID TYPE STRING,
BEG_TMSTMP TYPE STRING,
END_TMSTMP TYPE STRING,
BEGIN_DATE TYPE STRING,
END_DATE TYPE STRING,
BEGIN_TIME TYPE STRING,
END_TIME TYPE STRING,
DURATION_IN_SEC TYPE STRING,
DURATION TYPE STRING,
DURATION_UNIT TYPE STRING,
ASSIGNMENT_TYPE TYPE STRING,
BOOKING_TYPE TYPE STRING,
CUSTOMER TYPE STRING,
COUNTRY TYPE STRING,
REGION TYPE STRING,
POST_CODE TYPE STRING,
CITY TYPE STRING,
STREET TYPE STRING,
HOUSE_NUMBER TYPE STRING,
SEND_GW_MESSAGE TYPE STRING,
SUBJECT TYPE STRING,
GW_DESCRIPTION TYPE STRING,
ASSIGNMENT_NOTE TYPE STRING,
STATUS TYPE STRING,END OF T_EKKO_STR.
DATA: WA_WFDSS_UI_ASSIGNMENT_MAINTAIN_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_WFDSS_UI_ASSIGNMENT_MAINTAIN_STR-RESOURCE_DESC sy-vline 
WA_WFDSS_UI_ASSIGNMENT_MAINTAIN_STR-DEMAND_DESC sy-vline 
WA_WFDSS_UI_ASSIGNMENT_MAINTAIN_STR-DEMAND_ID sy-vline 
WA_WFDSS_UI_ASSIGNMENT_MAINTAIN_STR-BEG_TMSTMP sy-vline 
WA_WFDSS_UI_ASSIGNMENT_MAINTAIN_STR-END_TMSTMP sy-vline 
WA_WFDSS_UI_ASSIGNMENT_MAINTAIN_STR-BEGIN_DATE sy-vline 
WA_WFDSS_UI_ASSIGNMENT_MAINTAIN_STR-END_DATE sy-vline 
WA_WFDSS_UI_ASSIGNMENT_MAINTAIN_STR-BEGIN_TIME sy-vline 
WA_WFDSS_UI_ASSIGNMENT_MAINTAIN_STR-END_TIME sy-vline 
WA_WFDSS_UI_ASSIGNMENT_MAINTAIN_STR-DURATION_IN_SEC sy-vline 
WA_WFDSS_UI_ASSIGNMENT_MAINTAIN_STR-DURATION sy-vline 
WA_WFDSS_UI_ASSIGNMENT_MAINTAIN_STR-DURATION_UNIT sy-vline 
WA_WFDSS_UI_ASSIGNMENT_MAINTAIN_STR-ASSIGNMENT_TYPE sy-vline 
WA_WFDSS_UI_ASSIGNMENT_MAINTAIN_STR-BOOKING_TYPE sy-vline 
WA_WFDSS_UI_ASSIGNMENT_MAINTAIN_STR-CUSTOMER sy-vline 
WA_WFDSS_UI_ASSIGNMENT_MAINTAIN_STR-COUNTRY sy-vline 
WA_WFDSS_UI_ASSIGNMENT_MAINTAIN_STR-REGION sy-vline 
WA_WFDSS_UI_ASSIGNMENT_MAINTAIN_STR-POST_CODE sy-vline 
WA_WFDSS_UI_ASSIGNMENT_MAINTAIN_STR-CITY sy-vline 
WA_WFDSS_UI_ASSIGNMENT_MAINTAIN_STR-STREET sy-vline 
WA_WFDSS_UI_ASSIGNMENT_MAINTAIN_STR-HOUSE_NUMBER sy-vline 
WA_WFDSS_UI_ASSIGNMENT_MAINTAIN_STR-SEND_GW_MESSAGE sy-vline 
WA_WFDSS_UI_ASSIGNMENT_MAINTAIN_STR-SUBJECT sy-vline 
WA_WFDSS_UI_ASSIGNMENT_MAINTAIN_STR-GW_DESCRIPTION sy-vline 
WA_WFDSS_UI_ASSIGNMENT_MAINTAIN_STR-ASSIGNMENT_NOTE sy-vline 
WA_WFDSS_UI_ASSIGNMENT_MAINTAIN_STR-STATUS sy-vline      INTO ld_text SEPARATED BY SPACE.

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