ABAP Select data from SAP table OIK_USRFLD into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM OIK_USRFLD
*  INTO TABLE @DATA(IT_OIK_USRFLD2).
*--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_OIK_USRFLD INDEX 1 INTO DATA(WA_OIK_USRFLD2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<OIK_USRFLD>-USERFLD1 = 1.
<OIK_USRFLD>-USERFLD2 = 1.
<OIK_USRFLD>-USERFLD3 = 1.
<OIK_USRFLD>-USERFLD4 = 1.
<OIK_USRFLD>-USERFLD5 = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_OIK_USRFLD-USERFLD6, sy-vline,
  WA_OIK_USRFLD-USERFLD7, sy-vline,
  WA_OIK_USRFLD-USERFLD8, sy-vline,
  WA_OIK_USRFLD-USERFLD9, sy-vline,
  WA_OIK_USRFLD-USERFLD10, sy-vline,
  WA_OIK_USRFLD-USERFLD11, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_OIK_USRFLD 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_OIK_USRFLD 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_OIK_USRFLD INTO WA_OIK_USRFLD.


*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_OIK_USRFLD_STR, 
USERFLD1 TYPE STRING,
USERFLD2 TYPE STRING,
USERFLD3 TYPE STRING,
USERFLD4 TYPE STRING,
USERFLD5 TYPE STRING,
USERFLD6 TYPE STRING,
USERFLD7 TYPE STRING,
USERFLD8 TYPE STRING,
USERFLD9 TYPE STRING,
USERFLD10 TYPE STRING,
USERFLD11 TYPE STRING,
USERFLD12 TYPE STRING,
USERFLD13 TYPE STRING,
USERFLD14 TYPE STRING,
USERFLD15 TYPE STRING,
USERFLD16 TYPE STRING,
USERFLD17 TYPE STRING,
USERFLD18 TYPE STRING,
USERFLD19 TYPE STRING,
USERFLD20 TYPE STRING,END OF T_EKKO_STR.
DATA: WA_OIK_USRFLD_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_OIK_USRFLD_STR-USERFLD1 sy-vline 
WA_OIK_USRFLD_STR-USERFLD2 sy-vline 
WA_OIK_USRFLD_STR-USERFLD3 sy-vline 
WA_OIK_USRFLD_STR-USERFLD4 sy-vline 
WA_OIK_USRFLD_STR-USERFLD5 sy-vline 
WA_OIK_USRFLD_STR-USERFLD6 sy-vline 
WA_OIK_USRFLD_STR-USERFLD7 sy-vline 
WA_OIK_USRFLD_STR-USERFLD8 sy-vline 
WA_OIK_USRFLD_STR-USERFLD9 sy-vline 
WA_OIK_USRFLD_STR-USERFLD10 sy-vline 
WA_OIK_USRFLD_STR-USERFLD11 sy-vline 
WA_OIK_USRFLD_STR-USERFLD12 sy-vline 
WA_OIK_USRFLD_STR-USERFLD13 sy-vline 
WA_OIK_USRFLD_STR-USERFLD14 sy-vline 
WA_OIK_USRFLD_STR-USERFLD15 sy-vline 
WA_OIK_USRFLD_STR-USERFLD16 sy-vline 
WA_OIK_USRFLD_STR-USERFLD17 sy-vline 
WA_OIK_USRFLD_STR-USERFLD18 sy-vline 
WA_OIK_USRFLD_STR-USERFLD19 sy-vline 
WA_OIK_USRFLD_STR-USERFLD20 sy-vline      INTO ld_text SEPARATED BY SPACE.

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