ABAP Select data from SAP table DD12VD 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 DD12VD 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 DD12VD. 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 DD12VD 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_DD12VD TYPE STANDARD TABLE OF DD12VD,
      WA_DD12VD TYPE DD12VD,
      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: <DD12VD> TYPE DD12VD.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_DD12VD.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM DD12VD
  INTO TABLE IT_DD12VD.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM DD12VD
*  INTO TABLE @DATA(IT_DD12VD2).
*--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_DD12VD INDEX 1 INTO DATA(WA_DD12VD2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_DD12VD ASSIGNING <DD12VD>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<DD12VD>-SQLTAB = 1.
<DD12VD>-INDEXNAME = 1.
<DD12VD>-UNIQUEFLAG = 1.
<DD12VD>-DBSTATE = 1.
<DD12VD>-DBINCLEXCL = 1.

ENDLOOP.

LOOP AT IT_DD12VD INTO WA_DD12VD.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_DD12VD-DBINDXCRE, sy-vline,
  WA_DD12VD-DBSYSSEL1, sy-vline,
  WA_DD12VD-DBSYSSEL2, sy-vline,
  WA_DD12VD-DBSYSSEL3, sy-vline,
  WA_DD12VD-DBSYSSEL4, sy-vline,
  WA_DD12VD-DBSTATTXT, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_DD12VD 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_DD12VD 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_DD12VD INTO WA_DD12VD.


*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_DD12VD_STR, 
SQLTAB TYPE STRING,
INDEXNAME TYPE STRING,
UNIQUEFLAG TYPE STRING,
DBSTATE TYPE STRING,
DBINCLEXCL TYPE STRING,
DBINDXCRE TYPE STRING,
DBSYSSEL1 TYPE STRING,
DBSYSSEL2 TYPE STRING,
DBSYSSEL3 TYPE STRING,
DBSYSSEL4 TYPE STRING,
DBSTATTXT TYPE STRING,
ISEXTIND TYPE STRING,END OF T_EKKO_STR.
DATA: WA_DD12VD_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_DD12VD_STR-SQLTAB sy-vline 
WA_DD12VD_STR-INDEXNAME sy-vline 
WA_DD12VD_STR-UNIQUEFLAG sy-vline 
WA_DD12VD_STR-DBSTATE sy-vline 
WA_DD12VD_STR-DBINCLEXCL sy-vline 
WA_DD12VD_STR-DBINDXCRE sy-vline 
WA_DD12VD_STR-DBSYSSEL1 sy-vline 
WA_DD12VD_STR-DBSYSSEL2 sy-vline 
WA_DD12VD_STR-DBSYSSEL3 sy-vline 
WA_DD12VD_STR-DBSYSSEL4 sy-vline 
WA_DD12VD_STR-DBSTATTXT sy-vline 
WA_DD12VD_STR-ISEXTIND sy-vline      INTO ld_text SEPARATED BY SPACE.

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