ABAP Select data from SAP table D0100 into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP D0100 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 D0100. 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 D0100 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_D0100 TYPE STANDARD TABLE OF D0100,
      WA_D0100 TYPE D0100,
      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: <D0100> TYPE D0100.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_D0100.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM D0100
  INTO TABLE IT_D0100.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM D0100
*  INTO TABLE @DATA(IT_D01002).
*--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_D0100 INDEX 1 INTO DATA(WA_D01002).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_D0100 ASSIGNING <D0100>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<D0100>-MAPN = 1.
<D0100>-VON = 1.
<D0100>-BIS = 1.
<D0100>-ERR = 1.
<D0100>-BOOKED = 1.

ENDLOOP.

LOOP AT IT_D0100 INTO WA_D0100.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_D0100-FINISH, sy-vline,
  WA_D0100-RESERVE, sy-vline,
  WA_D0100-CREATE, sy-vline,
  WA_D0100-BATCH, sy-vline,
  WA_D0100-SPERR, sy-vline,
  WA_D0100-MSTATUS, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_D0100 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_D0100 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_D0100 INTO WA_D0100.


*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_D0100_STR, 
MAPN TYPE STRING,
VON TYPE STRING,
BIS TYPE STRING,
ERR TYPE STRING,
BOOKED TYPE STRING,
FINISH TYPE STRING,
RESERVE TYPE STRING,
CREATE TYPE STRING,
BATCH TYPE STRING,
SPERR TYPE STRING,
MSTATUS TYPE STRING,
ALLMAP TYPE STRING,
FCODE TYPE STRING,
CREATOR TYPE STRING,END OF T_EKKO_STR.
DATA: WA_D0100_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_D0100_STR-MAPN sy-vline 
WA_D0100_STR-VON sy-vline 
WA_D0100_STR-BIS sy-vline 
WA_D0100_STR-ERR sy-vline 
WA_D0100_STR-BOOKED sy-vline 
WA_D0100_STR-FINISH sy-vline 
WA_D0100_STR-RESERVE sy-vline 
WA_D0100_STR-CREATE sy-vline 
WA_D0100_STR-BATCH sy-vline 
WA_D0100_STR-SPERR sy-vline 
WA_D0100_STR-MSTATUS sy-vline 
WA_D0100_STR-ALLMAP sy-vline 
WA_D0100_STR-FCODE sy-vline 
WA_D0100_STR-CREATOR sy-vline      INTO ld_text SEPARATED BY SPACE.

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