ABAP Select data from SAP table DD36M into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP DD36M 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 DD36M. 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 DD36M 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_DD36M TYPE STANDARD TABLE OF DD36M,
      WA_DD36M TYPE DD36M,
      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: <DD36M> TYPE DD36M.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_DD36M.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM DD36M
  INTO TABLE IT_DD36M.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM DD36M
*  INTO TABLE @DATA(IT_DD36M2).
*--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_DD36M INDEX 1 INTO DATA(WA_DD36M2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_DD36M ASSIGNING <DD36M>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<DD36M>-TABNAME = 1.
<DD36M>-FIELDNAME = 1.
<DD36M>-SHLPNAME = 1.
<DD36M>-SHLPFIELD = 1.
<DD36M>-FLPOSITION = 1.

ENDLOOP.

LOOP AT IT_DD36M INTO WA_DD36M.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_DD36M-SHTYPE, sy-vline,
  WA_DD36M-SHTABLE, sy-vline,
  WA_DD36M-SHFIELD, sy-vline,
  WA_DD36M-SHLPINPUT, sy-vline,
  WA_DD36M-SHLPOUTPUT, sy-vline,
  WA_DD36M-ROLLNAME, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_DD36M 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_DD36M 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_DD36M INTO WA_DD36M.


*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.

*Conversion exit DTYPE, internal->external for field DATATYPE
CALL FUNCTION 'CONVERSION_EXIT_DTYPE_OUTPUT'
  EXPORTING
    input =                      WA_DD36M-DATATYPE
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_DD36M-DATATYPE.
WRITE:/ 'New Value:', ld_input.
ENDFORM. 

*&---------------------------------------------------------------------*
*& Form process_as_string_field_values
*&---------------------------------------------------------------------*
FORM process_as_string_field_values CHANGING p_EKKO LIKE wa_EKKO.

TYPES: BEGIN OF T_DD36M_STR, 
TABNAME TYPE STRING,
FIELDNAME TYPE STRING,
SHLPNAME TYPE STRING,
SHLPFIELD TYPE STRING,
FLPOSITION TYPE STRING,
SHTYPE TYPE STRING,
SHTABLE TYPE STRING,
SHFIELD TYPE STRING,
SHLPINPUT TYPE STRING,
SHLPOUTPUT TYPE STRING,
ROLLNAME TYPE STRING,
DOMNAME TYPE STRING,
DATATYPE TYPE STRING,
LENG TYPE STRING,
DECIMALS TYPE STRING,
DEFAULTVAL TYPE STRING,
DEFAULTTYP TYPE STRING,END OF T_EKKO_STR.
DATA: WA_DD36M_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_DD36M_STR-TABNAME sy-vline 
WA_DD36M_STR-FIELDNAME sy-vline 
WA_DD36M_STR-SHLPNAME sy-vline 
WA_DD36M_STR-SHLPFIELD sy-vline 
WA_DD36M_STR-FLPOSITION sy-vline 
WA_DD36M_STR-SHTYPE sy-vline 
WA_DD36M_STR-SHTABLE sy-vline 
WA_DD36M_STR-SHFIELD sy-vline 
WA_DD36M_STR-SHLPINPUT sy-vline 
WA_DD36M_STR-SHLPOUTPUT sy-vline 
WA_DD36M_STR-ROLLNAME sy-vline 
WA_DD36M_STR-DOMNAME sy-vline 
WA_DD36M_STR-DATATYPE sy-vline 
WA_DD36M_STR-LENG sy-vline 
WA_DD36M_STR-DECIMALS sy-vline 
WA_DD36M_STR-DEFAULTVAL sy-vline 
WA_DD36M_STR-DEFAULTTYP sy-vline      INTO ld_text SEPARATED BY SPACE.

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