ABAP Select data from SAP table /SCDL/DB_DF into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM /SCDL/DB_DF
*  INTO TABLE @DATA(IT_/SCDL/DB_DF2).
*--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_/SCDL/DB_DF INDEX 1 INTO DATA(WA_/SCDL/DB_DF2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
</SCDL/DB_DF>-MANDT = 1.
</SCDL/DB_DF>-DOCID = 1.
</SCDL/DB_DF>-ITEMID = 1.
</SCDL/DB_DF>-DOCCATTO = 1.
</SCDL/DB_DF>-DOCNOTO = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_/SCDL/DB_DF-ITEMNOTO, sy-vline,
  WA_/SCDL/DB_DF-BSKEYTO, sy-vline,
  WA_/SCDL/DB_DF-DOCCAT, sy-vline,
  WA_/SCDL/DB_DF-DOCNOFR, sy-vline,
  WA_/SCDL/DB_DF-ITEMNOFR, sy-vline,
  WA_/SCDL/DB_DF-BSKEYFR, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_/SCDL/DB_DF 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_/SCDL/DB_DF 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_/SCDL/DB_DF INTO WA_/SCDL/DB_DF.


*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 ALPHA, internal->external for field ITEMNOTO
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_/SCDL/DB_DF-ITEMNOTO
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_/SCDL/DB_DF-ITEMNOTO.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field ITEMNOFR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_/SCDL/DB_DF-ITEMNOFR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_/SCDL/DB_DF-ITEMNOFR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit MATN1, internal->external for field PRODUCTNOFR
CALL FUNCTION 'CONVERSION_EXIT_MATN1_OUTPUT'
  EXPORTING
    input =                      WA_/SCDL/DB_DF-PRODUCTNOFR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_/SCDL/DB_DF-PRODUCTNOFR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit CUNIT, internal->external for field DOC_UOMFR
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_/SCDL/DB_DF-DOC_UOMFR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_/SCDL/DB_DF-DOC_UOMFR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit MATN1, internal->external for field PRODUCTNOTO
CALL FUNCTION 'CONVERSION_EXIT_MATN1_OUTPUT'
  EXPORTING
    input =                      WA_/SCDL/DB_DF-PRODUCTNOTO
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_/SCDL/DB_DF-PRODUCTNOTO.
WRITE:/ 'New Value:', ld_input.

*Conversion exit CUNIT, internal->external for field DOC_UOMTO
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_/SCDL/DB_DF-DOC_UOMTO
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_/SCDL/DB_DF-DOC_UOMTO.
WRITE:/ 'New Value:', ld_input.

*Conversion exit CUNIT, internal->external for field REL_UOM
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_/SCDL/DB_DF-REL_UOM
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_/SCDL/DB_DF-REL_UOM.
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_/SCDL/DB_DF_STR, 
MANDT TYPE STRING,
DOCID TYPE STRING,
ITEMID TYPE STRING,
DOCCATTO TYPE STRING,
DOCNOTO TYPE STRING,
ITEMNOTO TYPE STRING,
BSKEYTO TYPE STRING,
DOCCAT TYPE STRING,
DOCNOFR TYPE STRING,
ITEMNOFR TYPE STRING,
BSKEYFR TYPE STRING,
PRODUCTIDFR TYPE STRING,
PRODUCTBSKEYFR TYPE STRING,
PRODUCTNOFR TYPE STRING,
ITEM_COMPLFR TYPE STRING,
DOC_QTYFR TYPE STRING,
DOC_UOMFR TYPE STRING,
DOCIDTO TYPE STRING,
ITEMIDTO TYPE STRING,
PRODUCTIDTO TYPE STRING,
PRODUCTBSKEYTO TYPE STRING,
PRODUCTNOTO TYPE STRING,
ITEM_COMPLTO TYPE STRING,
DOC_QTYTO TYPE STRING,
DOC_UOMTO TYPE STRING,
REL_QTY TYPE STRING,
REL_UOM TYPE STRING,
REL_OFFSET_EXCL TYPE STRING,
REL_TSTAMPL TYPE STRING,
REL_TZONE TYPE STRING,END OF T_EKKO_STR.
DATA: WA_/SCDL/DB_DF_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_/SCDL/DB_DF_STR-MANDT sy-vline 
WA_/SCDL/DB_DF_STR-DOCID sy-vline 
WA_/SCDL/DB_DF_STR-ITEMID sy-vline 
WA_/SCDL/DB_DF_STR-DOCCATTO sy-vline 
WA_/SCDL/DB_DF_STR-DOCNOTO sy-vline 
WA_/SCDL/DB_DF_STR-ITEMNOTO sy-vline 
WA_/SCDL/DB_DF_STR-BSKEYTO sy-vline 
WA_/SCDL/DB_DF_STR-DOCCAT sy-vline 
WA_/SCDL/DB_DF_STR-DOCNOFR sy-vline 
WA_/SCDL/DB_DF_STR-ITEMNOFR sy-vline 
WA_/SCDL/DB_DF_STR-BSKEYFR sy-vline 
WA_/SCDL/DB_DF_STR-PRODUCTIDFR sy-vline 
WA_/SCDL/DB_DF_STR-PRODUCTBSKEYFR sy-vline 
WA_/SCDL/DB_DF_STR-PRODUCTNOFR sy-vline 
WA_/SCDL/DB_DF_STR-ITEM_COMPLFR sy-vline 
WA_/SCDL/DB_DF_STR-DOC_QTYFR sy-vline 
WA_/SCDL/DB_DF_STR-DOC_UOMFR sy-vline 
WA_/SCDL/DB_DF_STR-DOCIDTO sy-vline 
WA_/SCDL/DB_DF_STR-ITEMIDTO sy-vline 
WA_/SCDL/DB_DF_STR-PRODUCTIDTO sy-vline 
WA_/SCDL/DB_DF_STR-PRODUCTBSKEYTO sy-vline 
WA_/SCDL/DB_DF_STR-PRODUCTNOTO sy-vline 
WA_/SCDL/DB_DF_STR-ITEM_COMPLTO sy-vline 
WA_/SCDL/DB_DF_STR-DOC_QTYTO sy-vline 
WA_/SCDL/DB_DF_STR-DOC_UOMTO sy-vline 
WA_/SCDL/DB_DF_STR-REL_QTY sy-vline 
WA_/SCDL/DB_DF_STR-REL_UOM sy-vline 
WA_/SCDL/DB_DF_STR-REL_OFFSET_EXCL sy-vline 
WA_/SCDL/DB_DF_STR-REL_TSTAMPL sy-vline 
WA_/SCDL/DB_DF_STR-REL_TZONE sy-vline      INTO ld_text SEPARATED BY SPACE.

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