ABAP Select data from SAP table WKG_WOG_WKF into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM WKG_WOG_WKF
*  INTO TABLE @DATA(IT_WKG_WOG_WKF2).
*--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_WKG_WOG_WKF INDEX 1 INTO DATA(WA_WKG_WOG_WKF2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<WKG_WOG_WKF>-WKG001 = 1.
<WKG_WOG_WKF>-WKG002 = 1.
<WKG_WOG_WKF>-WKG003 = 1.
<WKG_WOG_WKF>-WKG004 = 1.
<WKG_WOG_WKF>-WKG005 = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_WKG_WOG_WKF-WKG006, sy-vline,
  WA_WKG_WOG_WKF-WKG007, sy-vline,
  WA_WKG_WOG_WKF-WKG008, sy-vline,
  WA_WKG_WOG_WKF-WKG009, sy-vline,
  WA_WKG_WOG_WKF-WKG010, sy-vline,
  WA_WKG_WOG_WKF-WKG011, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_WKG_WOG_WKF 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_WKG_WOG_WKF 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_WKG_WOG_WKF INTO WA_WKG_WOG_WKF.


*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_WKG_WOG_WKF_STR, 
WKG001 TYPE STRING,
WKG002 TYPE STRING,
WKG003 TYPE STRING,
WKG004 TYPE STRING,
WKG005 TYPE STRING,
WKG006 TYPE STRING,
WKG007 TYPE STRING,
WKG008 TYPE STRING,
WKG009 TYPE STRING,
WKG010 TYPE STRING,
WKG011 TYPE STRING,
WKG012 TYPE STRING,
WKG013 TYPE STRING,
WKG014 TYPE STRING,
WKG015 TYPE STRING,
WKG016 TYPE STRING,
WOG001 TYPE STRING,
WOG002 TYPE STRING,
WOG003 TYPE STRING,
WOG004 TYPE STRING,
WOG005 TYPE STRING,
WOG006 TYPE STRING,
WOG007 TYPE STRING,
WOG008 TYPE STRING,
WOG009 TYPE STRING,
WOG010 TYPE STRING,
WOG011 TYPE STRING,
WOG012 TYPE STRING,
WOG013 TYPE STRING,
WOG014 TYPE STRING,
WOG015 TYPE STRING,
WOG016 TYPE STRING,
WKF001 TYPE STRING,
WKF002 TYPE STRING,
WKF003 TYPE STRING,
WKF004 TYPE STRING,
WKF005 TYPE STRING,
WKF006 TYPE STRING,
WKF007 TYPE STRING,
WKF008 TYPE STRING,
WKF009 TYPE STRING,
WKF010 TYPE STRING,
WKF011 TYPE STRING,
WKF012 TYPE STRING,
WKF013 TYPE STRING,
WKF014 TYPE STRING,
WKF015 TYPE STRING,
WKF016 TYPE STRING,END OF T_EKKO_STR.
DATA: WA_WKG_WOG_WKF_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_WKG_WOG_WKF_STR-WKG001 sy-vline 
WA_WKG_WOG_WKF_STR-WKG002 sy-vline 
WA_WKG_WOG_WKF_STR-WKG003 sy-vline 
WA_WKG_WOG_WKF_STR-WKG004 sy-vline 
WA_WKG_WOG_WKF_STR-WKG005 sy-vline 
WA_WKG_WOG_WKF_STR-WKG006 sy-vline 
WA_WKG_WOG_WKF_STR-WKG007 sy-vline 
WA_WKG_WOG_WKF_STR-WKG008 sy-vline 
WA_WKG_WOG_WKF_STR-WKG009 sy-vline 
WA_WKG_WOG_WKF_STR-WKG010 sy-vline 
WA_WKG_WOG_WKF_STR-WKG011 sy-vline 
WA_WKG_WOG_WKF_STR-WKG012 sy-vline 
WA_WKG_WOG_WKF_STR-WKG013 sy-vline 
WA_WKG_WOG_WKF_STR-WKG014 sy-vline 
WA_WKG_WOG_WKF_STR-WKG015 sy-vline 
WA_WKG_WOG_WKF_STR-WKG016 sy-vline 
WA_WKG_WOG_WKF_STR-WOG001 sy-vline 
WA_WKG_WOG_WKF_STR-WOG002 sy-vline 
WA_WKG_WOG_WKF_STR-WOG003 sy-vline 
WA_WKG_WOG_WKF_STR-WOG004 sy-vline 
WA_WKG_WOG_WKF_STR-WOG005 sy-vline 
WA_WKG_WOG_WKF_STR-WOG006 sy-vline 
WA_WKG_WOG_WKF_STR-WOG007 sy-vline 
WA_WKG_WOG_WKF_STR-WOG008 sy-vline 
WA_WKG_WOG_WKF_STR-WOG009 sy-vline 
WA_WKG_WOG_WKF_STR-WOG010 sy-vline 
WA_WKG_WOG_WKF_STR-WOG011 sy-vline 
WA_WKG_WOG_WKF_STR-WOG012 sy-vline 
WA_WKG_WOG_WKF_STR-WOG013 sy-vline 
WA_WKG_WOG_WKF_STR-WOG014 sy-vline 
WA_WKG_WOG_WKF_STR-WOG015 sy-vline 
WA_WKG_WOG_WKF_STR-WOG016 sy-vline 
WA_WKG_WOG_WKF_STR-WKF001 sy-vline 
WA_WKG_WOG_WKF_STR-WKF002 sy-vline 
WA_WKG_WOG_WKF_STR-WKF003 sy-vline 
WA_WKG_WOG_WKF_STR-WKF004 sy-vline 
WA_WKG_WOG_WKF_STR-WKF005 sy-vline 
WA_WKG_WOG_WKF_STR-WKF006 sy-vline 
WA_WKG_WOG_WKF_STR-WKF007 sy-vline 
WA_WKG_WOG_WKF_STR-WKF008 sy-vline 
WA_WKG_WOG_WKF_STR-WKF009 sy-vline 
WA_WKG_WOG_WKF_STR-WKF010 sy-vline 
WA_WKG_WOG_WKF_STR-WKF011 sy-vline 
WA_WKG_WOG_WKF_STR-WKF012 sy-vline 
WA_WKG_WOG_WKF_STR-WKF013 sy-vline 
WA_WKG_WOG_WKF_STR-WKF014 sy-vline 
WA_WKG_WOG_WKF_STR-WKF015 sy-vline 
WA_WKG_WOG_WKF_STR-WKF016 sy-vline      INTO ld_text SEPARATED BY SPACE.

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