ABAP Select data from SAP table WFD_S_STAGING into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM WFD_S_STAGING
*  INTO TABLE @DATA(IT_WFD_S_STAGING2).
*--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_WFD_S_STAGING INDEX 1 INTO DATA(WA_WFD_S_STAGING2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<WFD_S_STAGING>-WORKER_ID = 1.
<WFD_S_STAGING>-VERSION = 1.
<WFD_S_STAGING>-ERROR_CODE = 1.
<WFD_S_STAGING>-ERROR_TEXT = 1.
<WFD_S_STAGING>-PAYLOAD = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_WFD_S_STAGING-ID, sy-vline,
  WA_WFD_S_STAGING-VERSIONID, sy-vline,
  WA_WFD_S_STAGING-EXTERNALID, sy-vline,
  WA_WFD_S_STAGING-USERACCOUNT, sy-vline,
  WA_WFD_S_STAGING-USERNAME, sy-vline,
  WA_WFD_S_STAGING-PERSONALDETAILS, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_WFD_S_STAGING 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_WFD_S_STAGING 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_WFD_S_STAGING INTO WA_WFD_S_STAGING.


*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_WFD_S_STAGING_STR, 
WORKER_ID TYPE STRING,
VERSION TYPE STRING,
ERROR_CODE TYPE STRING,
ERROR_TEXT TYPE STRING,
PAYLOAD TYPE STRING,
ID TYPE STRING,
VERSIONID TYPE STRING,
EXTERNALID TYPE STRING,
USERACCOUNT TYPE STRING,
USERNAME TYPE STRING,
PERSONALDETAILS TYPE STRING,
PROFILEDETAILS TYPE STRING,
PRIVATEADDRESSES TYPE STRING,
EMAILS TYPE STRING,
PHONES TYPE STRING,
PHOTOS TYPE STRING,
SYSTEMOFRECORDKEYS TYPE STRING,
WORKASSIGNMENTS TYPE STRING,
SKILLTAGS TYPE STRING,
PROCESS_MODE TYPE STRING,
DATA_SOURCE TYPE STRING,END OF T_EKKO_STR.
DATA: WA_WFD_S_STAGING_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_WFD_S_STAGING_STR-WORKER_ID sy-vline 
WA_WFD_S_STAGING_STR-VERSION sy-vline 
WA_WFD_S_STAGING_STR-ERROR_CODE sy-vline 
WA_WFD_S_STAGING_STR-ERROR_TEXT sy-vline 
WA_WFD_S_STAGING_STR-PAYLOAD sy-vline 
WA_WFD_S_STAGING_STR-ID sy-vline 
WA_WFD_S_STAGING_STR-VERSIONID sy-vline 
WA_WFD_S_STAGING_STR-EXTERNALID sy-vline 
WA_WFD_S_STAGING_STR-USERACCOUNT sy-vline 
WA_WFD_S_STAGING_STR-USERNAME sy-vline 
WA_WFD_S_STAGING_STR-PERSONALDETAILS sy-vline 
WA_WFD_S_STAGING_STR-PROFILEDETAILS sy-vline 
WA_WFD_S_STAGING_STR-PRIVATEADDRESSES sy-vline 
WA_WFD_S_STAGING_STR-EMAILS sy-vline 
WA_WFD_S_STAGING_STR-PHONES sy-vline 
WA_WFD_S_STAGING_STR-PHOTOS sy-vline 
WA_WFD_S_STAGING_STR-SYSTEMOFRECORDKEYS sy-vline 
WA_WFD_S_STAGING_STR-WORKASSIGNMENTS sy-vline 
WA_WFD_S_STAGING_STR-SKILLTAGS sy-vline 
WA_WFD_S_STAGING_STR-PROCESS_MODE sy-vline 
WA_WFD_S_STAGING_STR-DATA_SOURCE sy-vline      INTO ld_text SEPARATED BY SPACE.

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