ABAP Select data from SAP table /SCWM/S_WI_WHO_WT_DB into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM /SCWM/S_WI_WHO_WT_DB
*  INTO TABLE @DATA(IT_/SCWM/S_WI_WHO_WT_DB2).
*--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_/SCWM/S_WI_WHO_WT_DB INDEX 1 INTO DATA(WA_/SCWM/S_WI_WHO_WT_DB2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
</SCWM/S_WI_WHO_WT_DB>-MANDT = 1.
</SCWM/S_WI_WHO_WT_DB>-LGNUM = 1.
</SCWM/S_WI_WHO_WT_DB>-RSRC = 1.
</SCWM/S_WI_WHO_WT_DB>-RSRC_TYPE = 1.
</SCWM/S_WI_WHO_WT_DB>-WHO = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_/SCWM/S_WI_WHO_WT_DB-STATUS, sy-vline,
  WA_/SCWM/S_WI_WHO_WT_DB-QUEUE, sy-vline,
  WA_/SCWM/S_WI_WHO_WT_DB-LSD, sy-vline,
  WA_/SCWM/S_WI_WHO_WT_DB-TANUM, sy-vline,
  WA_/SCWM/S_WI_WHO_WT_DB-VLTYP, sy-vline,
  WA_/SCWM/S_WI_WHO_WT_DB-VLBER, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_/SCWM/S_WI_WHO_WT_DB 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_/SCWM/S_WI_WHO_WT_DB 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_/SCWM/S_WI_WHO_WT_DB INTO WA_/SCWM/S_WI_WHO_WT_DB.


*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 ALPH0, internal->external for field WHO
CALL FUNCTION 'CONVERSION_EXIT_ALPH0_OUTPUT'
  EXPORTING
    input =                      WA_/SCWM/S_WI_WHO_WT_DB-WHO
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_/SCWM/S_WI_WHO_WT_DB-WHO.
WRITE:/ 'New Value:', ld_input.

*Conversion exit TSTWH, internal->external for field LSD
CALL FUNCTION 'CONVERSION_EXIT_TSTWH_OUTPUT'
  EXPORTING
    input =                      WA_/SCWM/S_WI_WHO_WT_DB-LSD
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_/SCWM/S_WI_WHO_WT_DB-LSD.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPH0, internal->external for field TANUM
CALL FUNCTION 'CONVERSION_EXIT_ALPH0_OUTPUT'
  EXPORTING
    input =                      WA_/SCWM/S_WI_WHO_WT_DB-TANUM
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_/SCWM/S_WI_WHO_WT_DB-TANUM.
WRITE:/ 'New Value:', ld_input.

*Conversion exit TSTWH, internal->external for field CREATED_AT
CALL FUNCTION 'CONVERSION_EXIT_TSTWH_OUTPUT'
  EXPORTING
    input =                      WA_/SCWM/S_WI_WHO_WT_DB-CREATED_AT
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_/SCWM/S_WI_WHO_WT_DB-CREATED_AT.
WRITE:/ 'New Value:', ld_input.

*Conversion exit TSTWH, internal->external for field CHANGED_AT
CALL FUNCTION 'CONVERSION_EXIT_TSTWH_OUTPUT'
  EXPORTING
    input =                      WA_/SCWM/S_WI_WHO_WT_DB-CHANGED_AT
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_/SCWM/S_WI_WHO_WT_DB-CHANGED_AT.
WRITE:/ 'New Value:', ld_input.

*Conversion exit TSTWH, internal->external for field CONFIRMED_AT
CALL FUNCTION 'CONVERSION_EXIT_TSTWH_OUTPUT'
  EXPORTING
    input =                      WA_/SCWM/S_WI_WHO_WT_DB-CONFIRMED_AT
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_/SCWM/S_WI_WHO_WT_DB-CONFIRMED_AT.
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_/SCWM/S_WI_WHO_WT_DB_STR, 
MANDT TYPE STRING,
LGNUM TYPE STRING,
RSRC TYPE STRING,
RSRC_TYPE TYPE STRING,
WHO TYPE STRING,
STATUS TYPE STRING,
QUEUE TYPE STRING,
LSD TYPE STRING,
TANUM TYPE STRING,
VLTYP TYPE STRING,
VLBER TYPE STRING,
VLPLA TYPE STRING,
NLTYP TYPE STRING,
NLBER TYPE STRING,
NLPLA TYPE STRING,
TRART TYPE STRING,
WHO_GRP_ID_STR TYPE STRING,
OPT_RSRC_ID_STR TYPE STRING,
RSRC_TYPE_CAPA_STR TYPE STRING,
LAST_FETCHED_AT_STR TYPE STRING,
RSRC_TYPE_STR TYPE STRING,
MOD_DEL_FLG TYPE STRING,
CREATED_AT TYPE STRING,
CHANGED_AT TYPE STRING,
CONFIRMED_AT TYPE STRING,END OF T_EKKO_STR.
DATA: WA_/SCWM/S_WI_WHO_WT_DB_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_/SCWM/S_WI_WHO_WT_DB_STR-MANDT sy-vline 
WA_/SCWM/S_WI_WHO_WT_DB_STR-LGNUM sy-vline 
WA_/SCWM/S_WI_WHO_WT_DB_STR-RSRC sy-vline 
WA_/SCWM/S_WI_WHO_WT_DB_STR-RSRC_TYPE sy-vline 
WA_/SCWM/S_WI_WHO_WT_DB_STR-WHO sy-vline 
WA_/SCWM/S_WI_WHO_WT_DB_STR-STATUS sy-vline 
WA_/SCWM/S_WI_WHO_WT_DB_STR-QUEUE sy-vline 
WA_/SCWM/S_WI_WHO_WT_DB_STR-LSD sy-vline 
WA_/SCWM/S_WI_WHO_WT_DB_STR-TANUM sy-vline 
WA_/SCWM/S_WI_WHO_WT_DB_STR-VLTYP sy-vline 
WA_/SCWM/S_WI_WHO_WT_DB_STR-VLBER sy-vline 
WA_/SCWM/S_WI_WHO_WT_DB_STR-VLPLA sy-vline 
WA_/SCWM/S_WI_WHO_WT_DB_STR-NLTYP sy-vline 
WA_/SCWM/S_WI_WHO_WT_DB_STR-NLBER sy-vline 
WA_/SCWM/S_WI_WHO_WT_DB_STR-NLPLA sy-vline 
WA_/SCWM/S_WI_WHO_WT_DB_STR-TRART sy-vline 
WA_/SCWM/S_WI_WHO_WT_DB_STR-WHO_GRP_ID_STR sy-vline 
WA_/SCWM/S_WI_WHO_WT_DB_STR-OPT_RSRC_ID_STR sy-vline 
WA_/SCWM/S_WI_WHO_WT_DB_STR-RSRC_TYPE_CAPA_STR sy-vline 
WA_/SCWM/S_WI_WHO_WT_DB_STR-LAST_FETCHED_AT_STR sy-vline 
WA_/SCWM/S_WI_WHO_WT_DB_STR-RSRC_TYPE_STR sy-vline 
WA_/SCWM/S_WI_WHO_WT_DB_STR-MOD_DEL_FLG sy-vline 
WA_/SCWM/S_WI_WHO_WT_DB_STR-CREATED_AT sy-vline 
WA_/SCWM/S_WI_WHO_WT_DB_STR-CHANGED_AT sy-vline 
WA_/SCWM/S_WI_WHO_WT_DB_STR-CONFIRMED_AT sy-vline      INTO ld_text SEPARATED BY SPACE.

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