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ASSIGN - writable_exp

Quick Reference


... NEW class( ... )->attr | CAST type( ... )->dobj
  | table_exp  ...


1. ... NEW class( ... )->attr | CAST type( ... )->dobj

2. ... table_exp


The operand position after ASSIGN is a result position in which writable expressions can be specified.


Writable expressions can be specified for the memory are but not any other expressions, because only writable expressions can have a non-temporary result. Assigning a temporary data object to a field symbol would not make sense.

Alternative 1

... NEW class( ... )->attr | CAST type( ... )->dobj


This alternative to specifying the memory area mem_area of the statement ASSIGN assigns the result of a constructor expression

to the field symbol. The same rules apply as when statically specifying the memory area, but no offsets/lengths can be specified.



Constructor expression with NEW in the specified memory area of the statement ASSIGN. The assignment of the attribute attr to a field symbol persists the object.

    DATA attr TYPE string VALUE 'foo'.

  ASSIGN NEW class( )->attr TO FIELD-SYMBOL(<fs>).
  cl_demo_output=>display( <fs> ).


Constructor expression with CAST in the specified memory area of ASSIGN statements.

TYPES: BEGIN OF t_struc,
        col1 TYPE i,
        col2 TYPE i,
       END OF t_struc.

DATA dref TYPE REF TO data.
DATA struc TYPE t_struc.

dref = NEW t_struc( ).

ASSIGN CAST t_struc( dref )->col1 TO FIELD-SYMBOL(<col1>).
ASSIGN CAST t_struc( dref )->col2 TO FIELD-SYMBOL(<col2>).

Alternative 2

... table_exp


This alternative way of specifying the memory area mem_area of the statement ASSIGN assigns the result of the table expression table_exp or table expression chaining to the field symbol. The result of a table expression in these positions is always a temporary field symbol.

In this variant, the statement ASSIGN sets the return code sy-subrc.

Unlike when table expressions are used in other ways, the system field sy-tabix is set here in the same way as in a corresponding READ TABLE statement.

If the assignment is not successful, the field symbol keeps its previous state. In this variant, it is therefore not enough just to evaluate the predicate expression <fs> IS ASSIGNED; sy-subrc needs to be checked as well.

In the case of this variant of the statement ASSIGN, the addition CASTING can only be specified in assignments to an existing field symbol and not in inline declarations, and only as a standalone addition. The addition RANGE cannot be specified.


Unlike READ TABLE, chainings can be used here to assign components of read rows or rows from nested internal tables.


This example works in the same way as the example for READ TABLE ... ASSIGNING .... Here, the READ statement is replaced by an ASSIGN statements and the required component is assigned directly.

DATA: carrid TYPE sflight-carrid,
      connid TYPE sflight-connid,
      fldate TYPE sflight-fldate.


DATA sflight_tab TYPE SORTED TABLE OF sflight
                 WITH UNIQUE KEY carrid connid fldate.

       FROM sflight
       WHERE carrid = @carrid AND
             connid = @connid
       INTO TABLE @sflight_tab.

IF sy-subrc = 0.
  ASSIGN sflight_tab[ KEY primary_key COMPONENTS
                          carrid = carrid
                          connid = connid
                          fldate = fldate ]-price
         TO FIELD-SYMBOL(<price>).
  IF sy-subrc = 0.
    <price> = <price> * '0.9'.