ABAP Select data from SAP table D0300 into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP D0300 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 D0300. 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 D0300 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_D0300 TYPE STANDARD TABLE OF D0300,
      WA_D0300 TYPE D0300,
      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: <D0300> TYPE D0300.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_D0300.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM D0300
  INTO TABLE IT_D0300.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM D0300
*  INTO TABLE @DATA(IT_D03002).
*--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_D0300 INDEX 1 INTO DATA(WA_D03002).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_D0300 ASSIGNING <D0300>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<D0300>-HELL = 1.
<D0300>-DUNKEL = 1.
<D0300>-ERROR = 1.
<D0300>-BATCH = 1.
<D0300>-BATCHSYS = 1.

ENDLOOP.

LOOP AT IT_D0300 INTO WA_D0300.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_D0300-BLOCKNR, sy-vline,
  WA_D0300-LOGALL, sy-vline,
  WA_D0300-FCODE, sy-vline,
  WA_D0300-EXPERT, sy-vline,
  WA_D0300-DYDEFSIZE, sy-vline,
  WA_D0300-ERRFEND, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_D0300 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_D0300 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_D0300 INTO WA_D0300.


*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_D0300_STR, 
HELL TYPE STRING,
DUNKEL TYPE STRING,
ERROR TYPE STRING,
BATCH TYPE STRING,
BATCHSYS TYPE STRING,
BLOCKNR TYPE STRING,
LOGALL TYPE STRING,
FCODE TYPE STRING,
EXPERT TYPE STRING,
DYDEFSIZE TYPE STRING,
ERRFEND TYPE STRING,END OF T_EKKO_STR.
DATA: WA_D0300_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_D0300_STR-HELL sy-vline 
WA_D0300_STR-DUNKEL sy-vline 
WA_D0300_STR-ERROR sy-vline 
WA_D0300_STR-BATCH sy-vline 
WA_D0300_STR-BATCHSYS sy-vline 
WA_D0300_STR-BLOCKNR sy-vline 
WA_D0300_STR-LOGALL sy-vline 
WA_D0300_STR-FCODE sy-vline 
WA_D0300_STR-EXPERT sy-vline 
WA_D0300_STR-DYDEFSIZE sy-vline 
WA_D0300_STR-ERRFEND sy-vline      INTO ld_text SEPARATED BY SPACE.

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