ABAP Select data from SAP table DD01V_OLD into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP DD01V_OLD 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 DD01V_OLD. 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 DD01V_OLD 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_DD01V_OLD TYPE STANDARD TABLE OF DD01V_OLD,
      WA_DD01V_OLD TYPE DD01V_OLD,
      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: <DD01V_OLD> TYPE DD01V_OLD.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_DD01V_OLD.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM DD01V_OLD
  INTO TABLE IT_DD01V_OLD.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM DD01V_OLD
*  INTO TABLE @DATA(IT_DD01V_OLD2).
*--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_DD01V_OLD INDEX 1 INTO DATA(WA_DD01V_OLD2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_DD01V_OLD ASSIGNING <DD01V_OLD>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<DD01V_OLD>-DOMNAME = 1.
<DD01V_OLD>-DDLANGUAGE = 1.
<DD01V_OLD>-DATATYPE = 1.
<DD01V_OLD>-LENG = 1.
<DD01V_OLD>-OUTPUTLEN = 1.

ENDLOOP.

LOOP AT IT_DD01V_OLD INTO WA_DD01V_OLD.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_DD01V_OLD-DECIMALS, sy-vline,
  WA_DD01V_OLD-LOWERCASE, sy-vline,
  WA_DD01V_OLD-SIGNFLAG, sy-vline,
  WA_DD01V_OLD-LANGFLAG, sy-vline,
  WA_DD01V_OLD-VALEXI, sy-vline,
  WA_DD01V_OLD-ENTITYTAB, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_DD01V_OLD 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_DD01V_OLD 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_DD01V_OLD INTO WA_DD01V_OLD.


*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.
ENDFORM. 

*&---------------------------------------------------------------------*
*& Form process_as_string_field_values
*&---------------------------------------------------------------------*
FORM process_as_string_field_values CHANGING p_EKKO LIKE wa_EKKO.

TYPES: BEGIN OF T_DD01V_OLD_STR, 
DOMNAME TYPE STRING,
DDLANGUAGE TYPE STRING,
DATATYPE TYPE STRING,
LENG TYPE STRING,
OUTPUTLEN TYPE STRING,
DECIMALS TYPE STRING,
LOWERCASE TYPE STRING,
SIGNFLAG TYPE STRING,
LANGFLAG TYPE STRING,
VALEXI TYPE STRING,
ENTITYTAB TYPE STRING,
CONVEXIT TYPE STRING,
MASK TYPE STRING,
MASKLEN TYPE STRING,
DDTEXT TYPE STRING,
ACTFLAG TYPE STRING,
APPLCLASS TYPE STRING,
AUTHCLASS TYPE STRING,
AS4USER TYPE STRING,
AS4DATE TYPE STRING,
AS4TIME TYPE STRING,
DOMMASTER TYPE STRING,
RESERVEDOM TYPE STRING,
DOMGLOBAL TYPE STRING,END OF T_EKKO_STR.
DATA: WA_DD01V_OLD_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_DD01V_OLD_STR-DOMNAME sy-vline 
WA_DD01V_OLD_STR-DDLANGUAGE sy-vline 
WA_DD01V_OLD_STR-DATATYPE sy-vline 
WA_DD01V_OLD_STR-LENG sy-vline 
WA_DD01V_OLD_STR-OUTPUTLEN sy-vline 
WA_DD01V_OLD_STR-DECIMALS sy-vline 
WA_DD01V_OLD_STR-LOWERCASE sy-vline 
WA_DD01V_OLD_STR-SIGNFLAG sy-vline 
WA_DD01V_OLD_STR-LANGFLAG sy-vline 
WA_DD01V_OLD_STR-VALEXI sy-vline 
WA_DD01V_OLD_STR-ENTITYTAB sy-vline 
WA_DD01V_OLD_STR-CONVEXIT sy-vline 
WA_DD01V_OLD_STR-MASK sy-vline 
WA_DD01V_OLD_STR-MASKLEN sy-vline 
WA_DD01V_OLD_STR-DDTEXT sy-vline 
WA_DD01V_OLD_STR-ACTFLAG sy-vline 
WA_DD01V_OLD_STR-APPLCLASS sy-vline 
WA_DD01V_OLD_STR-AUTHCLASS sy-vline 
WA_DD01V_OLD_STR-AS4USER sy-vline 
WA_DD01V_OLD_STR-AS4DATE sy-vline 
WA_DD01V_OLD_STR-AS4TIME sy-vline 
WA_DD01V_OLD_STR-DOMMASTER sy-vline 
WA_DD01V_OLD_STR-RESERVEDOM sy-vline 
WA_DD01V_OLD_STR-DOMGLOBAL sy-vline      INTO ld_text SEPARATED BY SPACE.

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