ABAP Select data from SAP table DCUNITGET into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM DCUNITGET
*  INTO TABLE @DATA(IT_DCUNITGET2).
*--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_DCUNITGET INDEX 1 INTO DATA(WA_DCUNITGET2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<DCUNITGET>-TB3 = 1.
<DCUNITGET>-TB6 = 1.
<DCUNITGET>-TABL = 1.
<DCUNITGET>-TABD = 1.
<DCUNITGET>-TBHD = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_DCUNITGET-TBFD, sy-vline,
  WA_DCUNITGET-TBFK, sy-vline,
  WA_DCUNITGET-TBSH, sy-vline,
  WA_DCUNITGET-TBIX, sy-vline,
  WA_DCUNITGET-TABT, sy-vline,
  WA_DCUNITGET-SQLT, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_DCUNITGET 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_DCUNITGET 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_DCUNITGET INTO WA_DCUNITGET.


*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_DCUNITGET_STR, 
TB3 TYPE STRING,
TB6 TYPE STRING,
TABL TYPE STRING,
TABD TYPE STRING,
TBHD TYPE STRING,
TBFD TYPE STRING,
TBFK TYPE STRING,
TBSH TYPE STRING,
TBIX TYPE STRING,
TABT TYPE STRING,
SQLT TYPE STRING,
SQHD TYPE STRING,
SQFD TYPE STRING,END OF T_EKKO_STR.
DATA: WA_DCUNITGET_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_DCUNITGET_STR-TB3 sy-vline 
WA_DCUNITGET_STR-TB6 sy-vline 
WA_DCUNITGET_STR-TABL sy-vline 
WA_DCUNITGET_STR-TABD sy-vline 
WA_DCUNITGET_STR-TBHD sy-vline 
WA_DCUNITGET_STR-TBFD sy-vline 
WA_DCUNITGET_STR-TBFK sy-vline 
WA_DCUNITGET_STR-TBSH sy-vline 
WA_DCUNITGET_STR-TBIX sy-vline 
WA_DCUNITGET_STR-TABT sy-vline 
WA_DCUNITGET_STR-SQLT sy-vline 
WA_DCUNITGET_STR-SQHD sy-vline 
WA_DCUNITGET_STR-SQFD sy-vline      INTO ld_text SEPARATED BY SPACE.

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