ABAP Select data from SAP table FIELD_DIF into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM FIELD_DIF
*  INTO TABLE @DATA(IT_FIELD_DIF2).
*--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_FIELD_DIF INDEX 1 INTO DATA(WA_FIELD_DIF2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<FIELD_DIF>-TABNAME = 1.
<FIELD_DIF>-FIELDNAME = 1.
<FIELD_DIF>-FIXED_VAL = 1.
<FIELD_DIF>-F1HELP = 1.
<FIELD_DIF>-F4HELP = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_FIELD_DIF-CHKROUTINE, sy-vline,
  WA_FIELD_DIF-NO_DISPLAY, sy-vline,
  WA_FIELD_DIF-DISPLENGTH, sy-vline,
  WA_FIELD_DIF-NO_INPUT, sy-vline,
  WA_FIELD_DIF-MODIFY_KEY, sy-vline,
  WA_FIELD_DIF-KEYFLAG, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_FIELD_DIF 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_FIELD_DIF 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_FIELD_DIF INTO WA_FIELD_DIF.


*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_FIELD_DIF_STR, 
TABNAME TYPE STRING,
FIELDNAME TYPE STRING,
FIXED_VAL TYPE STRING,
F1HELP TYPE STRING,
F4HELP TYPE STRING,
CHKROUTINE TYPE STRING,
NO_DISPLAY TYPE STRING,
DISPLENGTH TYPE STRING,
NO_INPUT TYPE STRING,
MODIFY_KEY TYPE STRING,
KEYFLAG TYPE STRING,
CHECKBT TYPE STRING,
ICON TYPE STRING,
LISTBOX TYPE STRING,
RADIO TYPE STRING,
PUSH TYPE STRING,
DIFFTEXT TYPE STRING,
PUSH_CALL TYPE STRING,
NO_F4_HELP TYPE STRING,
NO_FKY_CHK TYPE STRING,
INPCHK_FLD TYPE STRING,
INPFLD_EX TYPE STRING,
INPFLD_VAL TYPE STRING,
FIXED_COL TYPE STRING,
TBPOSITION TYPE STRING,
RM_TABNAME TYPE STRING,
RM_FLDNAME TYPE STRING,
RM_DEST TYPE STRING,
RM_REFFLD TYPE STRING,
RM_REFTAB TYPE STRING,
RM_REFDES TYPE STRING,END OF T_EKKO_STR.
DATA: WA_FIELD_DIF_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_FIELD_DIF_STR-TABNAME sy-vline 
WA_FIELD_DIF_STR-FIELDNAME sy-vline 
WA_FIELD_DIF_STR-FIXED_VAL sy-vline 
WA_FIELD_DIF_STR-F1HELP sy-vline 
WA_FIELD_DIF_STR-F4HELP sy-vline 
WA_FIELD_DIF_STR-CHKROUTINE sy-vline 
WA_FIELD_DIF_STR-NO_DISPLAY sy-vline 
WA_FIELD_DIF_STR-DISPLENGTH sy-vline 
WA_FIELD_DIF_STR-NO_INPUT sy-vline 
WA_FIELD_DIF_STR-MODIFY_KEY sy-vline 
WA_FIELD_DIF_STR-KEYFLAG sy-vline 
WA_FIELD_DIF_STR-CHECKBT sy-vline 
WA_FIELD_DIF_STR-ICON sy-vline 
WA_FIELD_DIF_STR-LISTBOX sy-vline 
WA_FIELD_DIF_STR-RADIO sy-vline 
WA_FIELD_DIF_STR-PUSH sy-vline 
WA_FIELD_DIF_STR-DIFFTEXT sy-vline 
WA_FIELD_DIF_STR-PUSH_CALL sy-vline 
WA_FIELD_DIF_STR-NO_F4_HELP sy-vline 
WA_FIELD_DIF_STR-NO_FKY_CHK sy-vline 
WA_FIELD_DIF_STR-INPCHK_FLD sy-vline 
WA_FIELD_DIF_STR-INPFLD_EX sy-vline 
WA_FIELD_DIF_STR-INPFLD_VAL sy-vline 
WA_FIELD_DIF_STR-FIXED_COL sy-vline 
WA_FIELD_DIF_STR-TBPOSITION sy-vline 
WA_FIELD_DIF_STR-RM_TABNAME sy-vline 
WA_FIELD_DIF_STR-RM_FLDNAME sy-vline 
WA_FIELD_DIF_STR-RM_DEST sy-vline 
WA_FIELD_DIF_STR-RM_REFFLD sy-vline 
WA_FIELD_DIF_STR-RM_REFTAB sy-vline 
WA_FIELD_DIF_STR-RM_REFDES sy-vline      INTO ld_text SEPARATED BY SPACE.

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