ABAP Select data from SAP table DDRTOBJHEADER into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM DDRTOBJHEADER
*  INTO TABLE @DATA(IT_DDRTOBJHEADER2).
*--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_DDRTOBJHEADER INDEX 1 INTO DATA(WA_DDRTOBJHEADER2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<DDRTOBJHEADER>-TABNAME = 1.
<DDRTOBJHEADER>-TABTYPE = 1.
<DDRTOBJHEADER>-TABFORM = 1.
<DDRTOBJHEADER>-FLDCNT = 1.
<DDRTOBJHEADER>-TABLEN = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_DDRTOBJHEADER-KEYCNT, sy-vline,
  WA_DDRTOBJHEADER-KEYLEN, sy-vline,
  WA_DDRTOBJHEADER-CLPOS, sy-vline,
  WA_DDRTOBJHEADER-ALIGN, sy-vline,
  WA_DDRTOBJHEADER-BUFSTATE, sy-vline,
  WA_DDRTOBJHEADER-BUFPARM1, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_DDRTOBJHEADER 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_DDRTOBJHEADER 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_DDRTOBJHEADER INTO WA_DDRTOBJHEADER.


*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_DDRTOBJHEADER_STR, 
TABNAME TYPE STRING,
TABTYPE TYPE STRING,
TABFORM TYPE STRING,
FLDCNT TYPE STRING,
TABLEN TYPE STRING,
KEYCNT TYPE STRING,
KEYLEN TYPE STRING,
CLPOS TYPE STRING,
ALIGN TYPE STRING,
BUFSTATE TYPE STRING,
BUFPARM1 TYPE STRING,
BUFPARM2 TYPE STRING,
FLAGBYTE TYPE STRING,
REFNAME TYPE STRING,
DBASE TYPE STRING,
FLAG2 TYPE STRING,
FLAG3 TYPE STRING,
FLAG4 TYPE STRING,
FLAG5 TYPE STRING,
FLAG6 TYPE STRING,
POINTERLG TYPE STRING,
UNICODELG TYPE STRING,
UUID TYPE STRING,
LEAFCNT TYPE STRING,
COMPCNT TYPE STRING,END OF T_EKKO_STR.
DATA: WA_DDRTOBJHEADER_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_DDRTOBJHEADER_STR-TABNAME sy-vline 
WA_DDRTOBJHEADER_STR-TABTYPE sy-vline 
WA_DDRTOBJHEADER_STR-TABFORM sy-vline 
WA_DDRTOBJHEADER_STR-FLDCNT sy-vline 
WA_DDRTOBJHEADER_STR-TABLEN sy-vline 
WA_DDRTOBJHEADER_STR-KEYCNT sy-vline 
WA_DDRTOBJHEADER_STR-KEYLEN sy-vline 
WA_DDRTOBJHEADER_STR-CLPOS sy-vline 
WA_DDRTOBJHEADER_STR-ALIGN sy-vline 
WA_DDRTOBJHEADER_STR-BUFSTATE sy-vline 
WA_DDRTOBJHEADER_STR-BUFPARM1 sy-vline 
WA_DDRTOBJHEADER_STR-BUFPARM2 sy-vline 
WA_DDRTOBJHEADER_STR-FLAGBYTE sy-vline 
WA_DDRTOBJHEADER_STR-REFNAME sy-vline 
WA_DDRTOBJHEADER_STR-DBASE sy-vline 
WA_DDRTOBJHEADER_STR-FLAG2 sy-vline 
WA_DDRTOBJHEADER_STR-FLAG3 sy-vline 
WA_DDRTOBJHEADER_STR-FLAG4 sy-vline 
WA_DDRTOBJHEADER_STR-FLAG5 sy-vline 
WA_DDRTOBJHEADER_STR-FLAG6 sy-vline 
WA_DDRTOBJHEADER_STR-POINTERLG sy-vline 
WA_DDRTOBJHEADER_STR-UNICODELG sy-vline 
WA_DDRTOBJHEADER_STR-UUID sy-vline 
WA_DDRTOBJHEADER_STR-LEAFCNT sy-vline 
WA_DDRTOBJHEADER_STR-COMPCNT sy-vline      INTO ld_text SEPARATED BY SPACE.

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