ABAP Select data from SAP table /SCMB/DF_FIELDLIST into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM /SCMB/DF_FIELDLIST
*  INTO TABLE @DATA(IT_/SCMB/DF_FIELDLIST2).
*--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_/SCMB/DF_FIELDLIST INDEX 1 INTO DATA(WA_/SCMB/DF_FIELDLIST2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
</SCMB/DF_FIELDLIST>-TABNAME = 1.
</SCMB/DF_FIELDLIST>-FIELDNAME = 1.
</SCMB/DF_FIELDLIST>-POSITION = 1.
</SCMB/DF_FIELDLIST>-DOMNAME = 1.
</SCMB/DF_FIELDLIST>-ROLLNAME = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_/SCMB/DF_FIELDLIST-DATATYPE, sy-vline,
  WA_/SCMB/DF_FIELDLIST-LENG, sy-vline,
  WA_/SCMB/DF_FIELDLIST-OUTPUTLEN, sy-vline,
  WA_/SCMB/DF_FIELDLIST-DECIMALS, sy-vline,
  WA_/SCMB/DF_FIELDLIST-ATTRIBUTE, sy-vline,
ENDLOOP.
   
*Add any further fields from structure WA_/SCMB/DF_FIELDLIST 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_/SCMB/DF_FIELDLIST 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_/SCMB/DF_FIELDLIST INTO WA_/SCMB/DF_FIELDLIST.


*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 DTYPE, internal->external for field DATATYPE
CALL FUNCTION 'CONVERSION_EXIT_DTYPE_OUTPUT'
  EXPORTING
    input =                      WA_/SCMB/DF_FIELDLIST-DATATYPE
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_/SCMB/DF_FIELDLIST-DATATYPE.
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_/SCMB/DF_FIELDLIST_STR, 
TABNAME TYPE STRING,
FIELDNAME TYPE STRING,
POSITION TYPE STRING,
DOMNAME TYPE STRING,
ROLLNAME TYPE STRING,
DATATYPE TYPE STRING,
LENG TYPE STRING,
OUTPUTLEN TYPE STRING,
DECIMALS TYPE STRING,
ATTRIBUTE TYPE STRING,END OF T_EKKO_STR.
DATA: WA_/SCMB/DF_FIELDLIST_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_/SCMB/DF_FIELDLIST_STR-TABNAME sy-vline 
WA_/SCMB/DF_FIELDLIST_STR-FIELDNAME sy-vline 
WA_/SCMB/DF_FIELDLIST_STR-POSITION sy-vline 
WA_/SCMB/DF_FIELDLIST_STR-DOMNAME sy-vline 
WA_/SCMB/DF_FIELDLIST_STR-ROLLNAME sy-vline 
WA_/SCMB/DF_FIELDLIST_STR-DATATYPE sy-vline 
WA_/SCMB/DF_FIELDLIST_STR-LENG sy-vline 
WA_/SCMB/DF_FIELDLIST_STR-OUTPUTLEN sy-vline 
WA_/SCMB/DF_FIELDLIST_STR-DECIMALS sy-vline 
WA_/SCMB/DF_FIELDLIST_STR-ATTRIBUTE sy-vline      INTO ld_text SEPARATED BY SPACE.

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