A sample object type with a MAP member function : Member Function « Object Oriented « Oracle PL/SQL Tutorial

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Oracle PL/SQL Tutorial » Object Oriented » Member Function 
32. 3. 4. A sample object type with a MAP member function
SQL>
SQL> CREATE OR REPLACE TYPE myType AUTHID CURRENT_USER IS OBJECT
  2  my_number NUMBER
  3  , CONSTRUCTOR FUNCTION myType RETURN SELF AS RESULT
  4  , CONSTRUCTOR FUNCTION myTypemy_number NUMBER )RETURN SELF AS RESULT
  5  , MEMBER PROCEDURE print_instance_variable
  6  , MAP MEMBER FUNCTION equals RETURN NUMBER )INSTANTIABLE NOT FINAL;
  7  /

Type created.

SQL>
SQL> CREATE OR REPLACE TYPE BODY myType AS
  2    CONSTRUCTOR FUNCTION myType
  3    RETURN SELF AS RESULT IS
  4      my_instance_number NUMBER := 0;
  5    BEGIN
  6      SELF.my_number := my_instance_number;
  7      RETURN;
  8    END;
  9    CONSTRUCTOR FUNCTION myTypemy_number NUMBER )
 10    RETURN SELF AS RESULT IS
 11    BEGIN
 12      SELF.my_number := my_number;
 13      RETURN;
 14    END;
 15    MEMBER PROCEDURE print_instance_variable IS
 16    BEGIN
 17      DBMS_OUTPUT.PUT_LINE('Instance Variable ['||SELF.my_number||']');
 18    END;
 19    MAP MEMBER FUNCTION equals
 20    RETURN NUMBER IS
 21    BEGIN
 22      RETURN SELF.my_number;
 23
 24    END;
 25
 26  END;
 27  /

Type body created.

SQL>
SQL>
SQL> DECLARE
  2    obj1 myType := myType;
  3    obj2 myType := myType(1);
  4
  5  BEGIN
  6    obj1.print_instance_variable;
  7
  8    obj2.print_instance_variable;
  9
 10    IF obj1 = obj2 THEN
 11      DBMS_OUTPUT.PUT_LINE('equal.');
 12    ELSE
 13      DBMS_OUTPUT.PUT_LINE('unequal.');
 14    END IF;
 15
 16  END;
 17  /
Instance Variable [0]
Instance Variable [1]
unequal.

PL/SQL procedure successfully completed.
32. 3. Member Function
32. 3. 1. Type with member function
32. 3. 2. Call Object member function
32. 3. 3. Type with toString and mapping functions
32. 3. 4. A sample object type with a MAP member function
32. 3. 5. A sample object type with an ORDER member function.
32. 3. 6. This script demonstrates the static method.
32. 3. 7. Compare two type object instances
32. 3. 8. This script builds a sample object type with constructor.
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