ABAP Select data from SAP table DDFIELDTAB into internal table

Get Example source ABAP code based on a different SAP table
  Get ABAP code

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM DDFIELDTAB
*  INTO TABLE @DATA(IT_DDFIELDTAB2).
*--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_DDFIELDTAB INDEX 1 INTO DATA(WA_DDFIELDTAB2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<DDFIELDTAB>-TABNAME = 1.
<DDFIELDTAB>-NTABHD = 1.
<DDFIELDTAB>-TABNAME = 1.
<DDFIELDTAB>-DBASE = 1.
<DDFIELDTAB>-UUID = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_DDFIELDTAB-CRSTAMP, sy-vline,
  WA_DDFIELDTAB-ABSTAMP, sy-vline,
  WA_DDFIELDTAB-DYSTAMP, sy-vline,
  WA_DDFIELDTAB-FLDCNT, sy-vline,
  WA_DDFIELDTAB-TABLEN, sy-vline,
  WA_DDFIELDTAB-KEYCNT, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_DDFIELDTAB 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_DDFIELDTAB 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_DDFIELDTAB INTO WA_DDFIELDTAB.


*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 ISOLA, internal->external for field LANGU
CALL FUNCTION 'CONVERSION_EXIT_ISOLA_OUTPUT'
  EXPORTING
    input =                      WA_DDFIELDTAB-LANGU
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_DDFIELDTAB-LANGU.
WRITE:/ 'New Value:', ld_input.

*Conversion exit DTYPE, internal->external for field DATATYPE
CALL FUNCTION 'CONVERSION_EXIT_DTYPE_OUTPUT'
  EXPORTING
    input =                      WA_DDFIELDTAB-DATATYPE
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_DDFIELDTAB-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_DDFIELDTAB_STR, 
TABNAME TYPE STRING,
NTABHD TYPE STRING,
TABNAME TYPE STRING,
DBASE TYPE STRING,
UUID TYPE STRING,
CRSTAMP TYPE STRING,
ABSTAMP TYPE STRING,
DYSTAMP TYPE STRING,
FLDCNT TYPE STRING,
TABLEN TYPE STRING,
KEYCNT TYPE STRING,
KEYLEN TYPE STRING,
CLPOS TYPE STRING,
TABTYPE TYPE STRING,
TABFORM TYPE STRING,
REFNAME TYPE STRING,
FLAGBYTE TYPE STRING,
EXROUT TYPE STRING,
FLAG3 TYPE STRING,
FLAG4 TYPE STRING,
FLAG5 TYPE STRING,
FLAG6 TYPE STRING,
BUFSTATE TYPE STRING,
BUFPARM TYPE STRING,
ALIGN TYPE STRING,
POINTERLG TYPE STRING,
UNICODELG TYPE STRING,
COMPCNT TYPE STRING,
LEAFCNT TYPE STRING,
DBSQLTIMESTMP TYPE STRING,
ADD_DATA TYPE STRING,
DDOBJTYPE TYPE STRING,
DFIESHD TYPE STRING,
TABNAME TYPE STRING,
FIELDNAME TYPE STRING,
LANGU TYPE STRING,
POSITION TYPE STRING,
OFFSET TYPE STRING,
DOMNAME TYPE STRING,
ROLLNAME TYPE STRING,
CHECKTABLE TYPE STRING,
LENG TYPE STRING,
INTLEN TYPE STRING,
OUTPUTLEN TYPE STRING,
DECIMALS TYPE STRING,
DATATYPE TYPE STRING,
INTTYPE TYPE STRING,
REFTABLE TYPE STRING,
REFFIELD TYPE STRING,
PRECFIELD TYPE STRING,
AUTHORID TYPE STRING,
MEMORYID TYPE STRING,
LOGFLAG TYPE STRING,
MASK TYPE STRING,
MASKLEN TYPE STRING,
CONVEXIT TYPE STRING,
HEADLEN TYPE STRING,
SCRLEN1 TYPE STRING,
SCRLEN2 TYPE STRING,
SCRLEN3 TYPE STRING,
FIELDTEXT TYPE STRING,
REPTEXT TYPE STRING,
SCRTEXT_S TYPE STRING,
SCRTEXT_M TYPE STRING,
SCRTEXT_L TYPE STRING,
KEYFLAG TYPE STRING,
LOWERCASE TYPE STRING,
MAC TYPE STRING,
GENKEY TYPE STRING,
NOFORKEY TYPE STRING,
VALEXI TYPE STRING,
NOAUTHCH TYPE STRING,
SIGN TYPE STRING,
DYNPFLD TYPE STRING,
F4AVAILABL TYPE STRING,
COMPTYPE TYPE STRING,
LFIELDNAME TYPE STRING,
LTRFLDDIS TYPE STRING,
BIDICTRLC TYPE STRING,
OUTPUTSTYLE TYPE STRING,
NOHISTORY TYPE STRING,
AMPMFORMAT TYPE STRING,
LINES_DESCR TYPE STRING,
DFIES_TAB TYPE STRING,
FIXED_VALUES TYPE STRING,END OF T_EKKO_STR.
DATA: WA_DDFIELDTAB_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_DDFIELDTAB_STR-TABNAME sy-vline 
WA_DDFIELDTAB_STR-NTABHD sy-vline 
WA_DDFIELDTAB_STR-TABNAME sy-vline 
WA_DDFIELDTAB_STR-DBASE sy-vline 
WA_DDFIELDTAB_STR-UUID sy-vline 
WA_DDFIELDTAB_STR-CRSTAMP sy-vline 
WA_DDFIELDTAB_STR-ABSTAMP sy-vline 
WA_DDFIELDTAB_STR-DYSTAMP sy-vline 
WA_DDFIELDTAB_STR-FLDCNT sy-vline 
WA_DDFIELDTAB_STR-TABLEN sy-vline 
WA_DDFIELDTAB_STR-KEYCNT sy-vline 
WA_DDFIELDTAB_STR-KEYLEN sy-vline 
WA_DDFIELDTAB_STR-CLPOS sy-vline 
WA_DDFIELDTAB_STR-TABTYPE sy-vline 
WA_DDFIELDTAB_STR-TABFORM sy-vline 
WA_DDFIELDTAB_STR-REFNAME sy-vline 
WA_DDFIELDTAB_STR-FLAGBYTE sy-vline 
WA_DDFIELDTAB_STR-EXROUT sy-vline 
WA_DDFIELDTAB_STR-FLAG3 sy-vline 
WA_DDFIELDTAB_STR-FLAG4 sy-vline 
WA_DDFIELDTAB_STR-FLAG5 sy-vline 
WA_DDFIELDTAB_STR-FLAG6 sy-vline 
WA_DDFIELDTAB_STR-BUFSTATE sy-vline 
WA_DDFIELDTAB_STR-BUFPARM sy-vline 
WA_DDFIELDTAB_STR-ALIGN sy-vline 
WA_DDFIELDTAB_STR-POINTERLG sy-vline 
WA_DDFIELDTAB_STR-UNICODELG sy-vline 
WA_DDFIELDTAB_STR-COMPCNT sy-vline 
WA_DDFIELDTAB_STR-LEAFCNT sy-vline 
WA_DDFIELDTAB_STR-DBSQLTIMESTMP sy-vline 
WA_DDFIELDTAB_STR-ADD_DATA sy-vline 
WA_DDFIELDTAB_STR-DDOBJTYPE sy-vline 
WA_DDFIELDTAB_STR-DFIESHD sy-vline 
WA_DDFIELDTAB_STR-TABNAME sy-vline 
WA_DDFIELDTAB_STR-FIELDNAME sy-vline 
WA_DDFIELDTAB_STR-LANGU sy-vline 
WA_DDFIELDTAB_STR-POSITION sy-vline 
WA_DDFIELDTAB_STR-OFFSET sy-vline 
WA_DDFIELDTAB_STR-DOMNAME sy-vline 
WA_DDFIELDTAB_STR-ROLLNAME sy-vline 
WA_DDFIELDTAB_STR-CHECKTABLE sy-vline 
WA_DDFIELDTAB_STR-LENG sy-vline 
WA_DDFIELDTAB_STR-INTLEN sy-vline 
WA_DDFIELDTAB_STR-OUTPUTLEN sy-vline 
WA_DDFIELDTAB_STR-DECIMALS sy-vline 
WA_DDFIELDTAB_STR-DATATYPE sy-vline 
WA_DDFIELDTAB_STR-INTTYPE sy-vline 
WA_DDFIELDTAB_STR-REFTABLE sy-vline 
WA_DDFIELDTAB_STR-REFFIELD sy-vline 
WA_DDFIELDTAB_STR-PRECFIELD sy-vline 
WA_DDFIELDTAB_STR-AUTHORID sy-vline 
WA_DDFIELDTAB_STR-MEMORYID sy-vline 
WA_DDFIELDTAB_STR-LOGFLAG sy-vline 
WA_DDFIELDTAB_STR-MASK sy-vline 
WA_DDFIELDTAB_STR-MASKLEN sy-vline 
WA_DDFIELDTAB_STR-CONVEXIT sy-vline 
WA_DDFIELDTAB_STR-HEADLEN sy-vline 
WA_DDFIELDTAB_STR-SCRLEN1 sy-vline 
WA_DDFIELDTAB_STR-SCRLEN2 sy-vline 
WA_DDFIELDTAB_STR-SCRLEN3 sy-vline 
WA_DDFIELDTAB_STR-FIELDTEXT sy-vline 
WA_DDFIELDTAB_STR-REPTEXT sy-vline 
WA_DDFIELDTAB_STR-SCRTEXT_S sy-vline 
WA_DDFIELDTAB_STR-SCRTEXT_M sy-vline 
WA_DDFIELDTAB_STR-SCRTEXT_L sy-vline 
WA_DDFIELDTAB_STR-KEYFLAG sy-vline 
WA_DDFIELDTAB_STR-LOWERCASE sy-vline 
WA_DDFIELDTAB_STR-MAC sy-vline 
WA_DDFIELDTAB_STR-GENKEY sy-vline 
WA_DDFIELDTAB_STR-NOFORKEY sy-vline 
WA_DDFIELDTAB_STR-VALEXI sy-vline 
WA_DDFIELDTAB_STR-NOAUTHCH sy-vline 
WA_DDFIELDTAB_STR-SIGN sy-vline 
WA_DDFIELDTAB_STR-DYNPFLD sy-vline 
WA_DDFIELDTAB_STR-F4AVAILABL sy-vline 
WA_DDFIELDTAB_STR-COMPTYPE sy-vline 
WA_DDFIELDTAB_STR-LFIELDNAME sy-vline 
WA_DDFIELDTAB_STR-LTRFLDDIS sy-vline 
WA_DDFIELDTAB_STR-BIDICTRLC sy-vline 
WA_DDFIELDTAB_STR-OUTPUTSTYLE sy-vline 
WA_DDFIELDTAB_STR-NOHISTORY sy-vline 
WA_DDFIELDTAB_STR-AMPMFORMAT sy-vline 
WA_DDFIELDTAB_STR-LINES_DESCR sy-vline 
WA_DDFIELDTAB_STR-DFIES_TAB sy-vline 
WA_DDFIELDTAB_STR-FIXED_VALUES sy-vline      INTO ld_text SEPARATED BY SPACE.

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