ABAP Select data from SAP table DD28J into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP DD28J 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 DD28J. 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 DD28J 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_DD28J TYPE STANDARD TABLE OF DD28J,
      WA_DD28J TYPE DD28J,
      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: <DD28J> TYPE DD28J.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_DD28J.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM DD28J
  INTO TABLE IT_DD28J.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM DD28J
*  INTO TABLE @DATA(IT_DD28J2).
*--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_DD28J INDEX 1 INTO DATA(WA_DD28J2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_DD28J ASSIGNING <DD28J>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<DD28J>-VIEWNAME = 1.
<DD28J>-LTAB = 1.
<DD28J>-LFIELD = 1.
<DD28J>-OPERATOR = 1.
<DD28J>-RTAB = 1.

ENDLOOP.

LOOP AT IT_DD28J INTO WA_DD28J.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_DD28J-RFIELD, sy-vline,
  WA_DD28J-SOURCE, sy-vline,
  WA_DD28J-FRKTAB, sy-vline,
  WA_DD28J-FRKFIELD, sy-vline,
  WA_DD28J-FRKDIR, sy-vline,
  WA_DD28J-VOPERATOR, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_DD28J 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_DD28J 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_DD28J INTO WA_DD28J.


*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_DD28J_STR, 
VIEWNAME TYPE STRING,
LTAB TYPE STRING,
LFIELD TYPE STRING,
OPERATOR TYPE STRING,
RTAB TYPE STRING,
RFIELD TYPE STRING,
SOURCE TYPE STRING,
FRKTAB TYPE STRING,
FRKFIELD TYPE STRING,
FRKDIR TYPE STRING,
VOPERATOR TYPE STRING,
JOPERATOR TYPE STRING,
JCONSTANT TYPE STRING,
AND_OR TYPE STRING,
JSOURCE TYPE STRING,END OF T_EKKO_STR.
DATA: WA_DD28J_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_DD28J_STR-VIEWNAME sy-vline 
WA_DD28J_STR-LTAB sy-vline 
WA_DD28J_STR-LFIELD sy-vline 
WA_DD28J_STR-OPERATOR sy-vline 
WA_DD28J_STR-RTAB sy-vline 
WA_DD28J_STR-RFIELD sy-vline 
WA_DD28J_STR-SOURCE sy-vline 
WA_DD28J_STR-FRKTAB sy-vline 
WA_DD28J_STR-FRKFIELD sy-vline 
WA_DD28J_STR-FRKDIR sy-vline 
WA_DD28J_STR-VOPERATOR sy-vline 
WA_DD28J_STR-JOPERATOR sy-vline 
WA_DD28J_STR-JCONSTANT sy-vline 
WA_DD28J_STR-AND_OR sy-vline 
WA_DD28J_STR-JSOURCE sy-vline      INTO ld_text SEPARATED BY SPACE.

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