ABAP Select data from SAP table DD01VD into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP DD01VD 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 DD01VD. 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 DD01VD 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_DD01VD TYPE STANDARD TABLE OF DD01VD,
      WA_DD01VD TYPE DD01VD,
      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: <DD01VD> TYPE DD01VD.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_DD01VD.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM DD01VD
  INTO TABLE IT_DD01VD.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM DD01VD
*  INTO TABLE @DATA(IT_DD01VD2).
*--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_DD01VD INDEX 1 INTO DATA(WA_DD01VD2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_DD01VD ASSIGNING <DD01VD>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<DD01VD>-DOMNAME = 1.
<DD01VD>-DDTEXT = 1.
<DD01VD>-DATATYPE = 1.
<DD01VD>-LENG = 1.
<DD01VD>-DECIMALS = 1.

ENDLOOP.

LOOP AT IT_DD01VD INTO WA_DD01VD.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_DD01VD-OUTPUTLEN, sy-vline,
  WA_DD01VD-CONVEXIT, sy-vline,
  WA_DD01VD-SIGNFLAG, sy-vline,
  WA_DD01VD-LOWERCASE, sy-vline,
  WA_DD01VD-VALEXI, sy-vline,
  WA_DD01VD-ENTITYTAB, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_DD01VD 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_DD01VD 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_DD01VD INTO WA_DD01VD.


*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_DD01VD-DATATYPE
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_DD01VD-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_DD01VD_STR, 
DOMNAME TYPE STRING,
DDTEXT TYPE STRING,
DATATYPE TYPE STRING,
LENG TYPE STRING,
DECIMALS TYPE STRING,
OUTPUTLEN TYPE STRING,
CONVEXIT TYPE STRING,
SIGNFLAG TYPE STRING,
LOWERCASE TYPE STRING,
VALEXI TYPE STRING,
ENTITYTAB TYPE STRING,
APPENDNAME TYPE STRING,
PROXYTYPE TYPE STRING,
OUTPUTSTYLE TYPE STRING,
OUTPUTSTYLETXT TYPE STRING,
AMPMFORMAT TYPE STRING,END OF T_EKKO_STR.
DATA: WA_DD01VD_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_DD01VD_STR-DOMNAME sy-vline 
WA_DD01VD_STR-DDTEXT sy-vline 
WA_DD01VD_STR-DATATYPE sy-vline 
WA_DD01VD_STR-LENG sy-vline 
WA_DD01VD_STR-DECIMALS sy-vline 
WA_DD01VD_STR-OUTPUTLEN sy-vline 
WA_DD01VD_STR-CONVEXIT sy-vline 
WA_DD01VD_STR-SIGNFLAG sy-vline 
WA_DD01VD_STR-LOWERCASE sy-vline 
WA_DD01VD_STR-VALEXI sy-vline 
WA_DD01VD_STR-ENTITYTAB sy-vline 
WA_DD01VD_STR-APPENDNAME sy-vline 
WA_DD01VD_STR-PROXYTYPE sy-vline 
WA_DD01VD_STR-OUTPUTSTYLE sy-vline 
WA_DD01VD_STR-OUTPUTSTYLETXT sy-vline 
WA_DD01VD_STR-AMPMFORMAT sy-vline      INTO ld_text SEPARATED BY SPACE.

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