ABAP Select data from SAP table DD12ORA into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP DD12ORA 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 DD12ORA. 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 DD12ORA 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_DD12ORA TYPE STANDARD TABLE OF DD12ORA,
      WA_DD12ORA TYPE DD12ORA,
      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: <DD12ORA> TYPE DD12ORA.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_DD12ORA.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM DD12ORA
  INTO TABLE IT_DD12ORA.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM DD12ORA
*  INTO TABLE @DATA(IT_DD12ORA2).
*--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_DD12ORA INDEX 1 INTO DATA(WA_DD12ORA2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_DD12ORA ASSIGNING <DD12ORA>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<DD12ORA>-INDNAME = 1.
<DD12ORA>-SOURCE = 1.
<DD12ORA>-USEFLAG = 1.
<DD12ORA>-TABSPACE = 1.
<DD12ORA>-INIT = 1.

ENDLOOP.

LOOP AT IT_DD12ORA INTO WA_DD12ORA.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_DD12ORA-NEXT, sy-vline,
  WA_DD12ORA-MINEXT, sy-vline,
  WA_DD12ORA-MAXEXT, sy-vline,
  WA_DD12ORA-PCTINC, sy-vline,
  WA_DD12ORA-INITRANS, sy-vline,
  WA_DD12ORA-OFREELIST, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_DD12ORA 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_DD12ORA 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_DD12ORA INTO WA_DD12ORA.


*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_DD12ORA_STR, 
INDNAME TYPE STRING,
SOURCE TYPE STRING,
USEFLAG TYPE STRING,
TABSPACE TYPE STRING,
INIT TYPE STRING,
NEXT TYPE STRING,
MINEXT TYPE STRING,
MAXEXT TYPE STRING,
PCTINC TYPE STRING,
INITRANS TYPE STRING,
OFREELIST TYPE STRING,
OPCTFREE TYPE STRING,
BITMAP TYPE STRING,END OF T_EKKO_STR.
DATA: WA_DD12ORA_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_DD12ORA_STR-INDNAME sy-vline 
WA_DD12ORA_STR-SOURCE sy-vline 
WA_DD12ORA_STR-USEFLAG sy-vline 
WA_DD12ORA_STR-TABSPACE sy-vline 
WA_DD12ORA_STR-INIT sy-vline 
WA_DD12ORA_STR-NEXT sy-vline 
WA_DD12ORA_STR-MINEXT sy-vline 
WA_DD12ORA_STR-MAXEXT sy-vline 
WA_DD12ORA_STR-PCTINC sy-vline 
WA_DD12ORA_STR-INITRANS sy-vline 
WA_DD12ORA_STR-OFREELIST sy-vline 
WA_DD12ORA_STR-OPCTFREE sy-vline 
WA_DD12ORA_STR-BITMAP sy-vline      INTO ld_text SEPARATED BY SPACE.

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