ABAP Select data from SAP table DCTBFDCHG into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM DCTBFDCHG
*  INTO TABLE @DATA(IT_DCTBFDCHG2).
*--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_DCTBFDCHG INDEX 1 INTO DATA(WA_DCTBFDCHG2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<DCTBFDCHG>-TABNAME = 1.
<DCTBFDCHG>-FIELDNAME = 1.
<DCTBFDCHG>-POSITION = 1.
<DCTBFDCHG>-FIELDDEL = 1.
<DCTBFDCHG>-FIELDADD = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_DCTBFDCHG-INCLNAME, sy-vline,
  WA_DCTBFDCHG-KEYFLAGCHG, sy-vline,
  WA_DCTBFDCHG-FLDPOSCHG, sy-vline,
  WA_DCTBFDCHG-DOMCHG, sy-vline,
  WA_DCTBFDCHG-DOMDST, sy-vline,
  WA_DCTBFDCHG-DTELCHG, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_DCTBFDCHG 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_DCTBFDCHG 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_DCTBFDCHG INTO WA_DCTBFDCHG.


*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 DDTYPEDST
CALL FUNCTION 'CONVERSION_EXIT_DTYPE_OUTPUT'
  EXPORTING
    input =                      WA_DCTBFDCHG-DDTYPEDST
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_DCTBFDCHG-DDTYPEDST.
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_DCTBFDCHG_STR, 
TABNAME TYPE STRING,
FIELDNAME TYPE STRING,
POSITION TYPE STRING,
FIELDDEL TYPE STRING,
FIELDADD TYPE STRING,
INCLNAME TYPE STRING,
KEYFLAGCHG TYPE STRING,
FLDPOSCHG TYPE STRING,
DOMCHG TYPE STRING,
DOMDST TYPE STRING,
DTELCHG TYPE STRING,
DTELDST TYPE STRING,
DDTYPECHG TYPE STRING,
DDTYPEDST TYPE STRING,
ABTYPEDST TYPE STRING,
DDLENGCHG TYPE STRING,
DDLENGSRC TYPE STRING,
DDLENGDST TYPE STRING,
ABLENGDST TYPE STRING,
DDDECCHG TYPE STRING,
DDDECDST TYPE STRING,
DIRECTTYPE TYPE STRING,
NULLCHG TYPE STRING,
NULLSRC TYPE STRING,
NULLDST TYPE STRING,
FRKCHG TYPE STRING,
REFTABCHG TYPE STRING,
REFFLDCHG TYPE STRING,
CHKTABSRC TYPE STRING,
CHKTABDST TYPE STRING,
APPCHG TYPE STRING,
SHACHG TYPE STRING,
GROUPCHG TYPE STRING,END OF T_EKKO_STR.
DATA: WA_DCTBFDCHG_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_DCTBFDCHG_STR-TABNAME sy-vline 
WA_DCTBFDCHG_STR-FIELDNAME sy-vline 
WA_DCTBFDCHG_STR-POSITION sy-vline 
WA_DCTBFDCHG_STR-FIELDDEL sy-vline 
WA_DCTBFDCHG_STR-FIELDADD sy-vline 
WA_DCTBFDCHG_STR-INCLNAME sy-vline 
WA_DCTBFDCHG_STR-KEYFLAGCHG sy-vline 
WA_DCTBFDCHG_STR-FLDPOSCHG sy-vline 
WA_DCTBFDCHG_STR-DOMCHG sy-vline 
WA_DCTBFDCHG_STR-DOMDST sy-vline 
WA_DCTBFDCHG_STR-DTELCHG sy-vline 
WA_DCTBFDCHG_STR-DTELDST sy-vline 
WA_DCTBFDCHG_STR-DDTYPECHG sy-vline 
WA_DCTBFDCHG_STR-DDTYPEDST sy-vline 
WA_DCTBFDCHG_STR-ABTYPEDST sy-vline 
WA_DCTBFDCHG_STR-DDLENGCHG sy-vline 
WA_DCTBFDCHG_STR-DDLENGSRC sy-vline 
WA_DCTBFDCHG_STR-DDLENGDST sy-vline 
WA_DCTBFDCHG_STR-ABLENGDST sy-vline 
WA_DCTBFDCHG_STR-DDDECCHG sy-vline 
WA_DCTBFDCHG_STR-DDDECDST sy-vline 
WA_DCTBFDCHG_STR-DIRECTTYPE sy-vline 
WA_DCTBFDCHG_STR-NULLCHG sy-vline 
WA_DCTBFDCHG_STR-NULLSRC sy-vline 
WA_DCTBFDCHG_STR-NULLDST sy-vline 
WA_DCTBFDCHG_STR-FRKCHG sy-vline 
WA_DCTBFDCHG_STR-REFTABCHG sy-vline 
WA_DCTBFDCHG_STR-REFFLDCHG sy-vline 
WA_DCTBFDCHG_STR-CHKTABSRC sy-vline 
WA_DCTBFDCHG_STR-CHKTABDST sy-vline 
WA_DCTBFDCHG_STR-APPCHG sy-vline 
WA_DCTBFDCHG_STR-SHACHG sy-vline 
WA_DCTBFDCHG_STR-GROUPCHG sy-vline      INTO ld_text SEPARATED BY SPACE.

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