¿Cómo se define un símbolo de campo?

How do you define a field symbol?

Field symbols are placeholders or symbolic names for existing data objects (or parts of existing data objects), declared by the statement FIELD-SYMBOLS or by the declaration operator FIELD-SYMBOL. A memory area is assigned to a field symbol at program runtime.

To check whether a field is assigned to a field symbol, use the following logical expression: IS ASSIGNED The expression is true if a field has been assigned explicitly or implicitly to the field symbol .

To assign a data object to a field symbol, use the ASSIGN statement. The ASSIGN statement has several variants and parameters. If you already know the name of the field that you want to assign to the field symbol when you write a program, use the static ASSIGN statement: ASSIGN TO .

UNASSIGN . This statement initializes the field symbol . After the statement, the field symbol does not reference a memory area and the predicate expression IS ASSIGNED is false.

Generally, we use the explicit work area to process the internal table like appending & modifying records. While using the field-symbol, system uses the same memory allocated to that particular field in the record instead of moving it to work area and processing.

You can assign the table entry read from the table to a field symbol by specifying result as follows: READ TABLE itab key ASSIGNING . After the READ statement, the field symbol points to the table line. If the line type is structured, you should specify the same type for the field symbol when you declare it.

rel_exp – IS ASSIGNED – ABAP Keyword Documentation. This predicate expression checks whether a memory area is assigned to a field symbol . The expression is true if the field symbol points to a memory area. If the addition NOT is used, the expression is true if no memory area is assigned to the field symbol.

Field Symbols allows you to access content of variable to which its point to. This pointing to a variable is done using ASSIGN statement. Field Symbol does not store any value it simply point to the memory where variable value is store. Any operation to change value direct affects variable.

3 Answers. Inline declaration of a field symbol for an internal table in an ASSIGN statement and inline declaration of a field symbol for the rows of the table in a LOOP. LOOP AT ASSIGNING FIELD-SYMBOL(). ENDLOOP.

ASSIGN COMPONENT comp OF STRUCTURE struc TO . to assign one of its components comp to the field symbol . You can specify the component compeither as a literal or a variable. If comp is of type c or a structure which has no internal tables as components, it specifies the name of the component.

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